HomeMy WebLinkAboutCIRI-IYS-CAEC Wasilla High School 2012-EEENERGY AUDIT FINAL REPORT
Wasilla High School
701 E. Bogard Road
Wasilla, AK 99654
p (907) 352-8200
AkWarm ID No. CIRI-IYS-CAEC-02
800 F Street
Anchorage, AK 99501
p (907) 276-6664 f (907) 276-5042
Contact: Walter Heins, PE, CCP, CxA, CEA
32215 Lakefront Dr.
Soldotna, Alaska 99669
p (907) 260-5311
Contact: Jerry P. Herring, PE, CEA
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 i AkWarm No. CIRI-IYS-CAEC-02
Contents
I. Executive Summary .................................................................................................................. 1
II. Introduction .............................................................................................................................. 5
III. Energy Audit Process ............................................................................................................. 6
IV. Method of Analysis ................................................................................................................. 7
V. Building Description ................................................................................................................ 8
V.I SCHOOL ARCHITECTURAL DESCRIPTION .............................................................................................................. 8
V.II MECHANICAL DESCRIPTION ............................................................................................................................... 9
V.III ELECTRICAL DESCRIPTION .............................................................................................................................. 10
V.IV POOL EQUIPMENT DESCRIPTION ..................................................................................................................... 10
V.V OUTBUILDINGS DESCRIPTION ........................................................................................................................... 11
VI. Historic Energy Consumption and Cost............................................................................. 13
VI.I ELECTRICAL CONSUMPTION DATA ................................................................................................................... 13
VI.II NATURAL GAS CONSUMPTION DATA .............................................................................................................. 13
VI.III OVERALL ENERGY CONSUMPTION DATA ....................................................................................................... 13
VII. Equipment Inventory and Photo Survey .......................................................................... 15
VIII. Energy Conservation Measures ....................................................................................... 16
VIII.I SCHOOL ENERGY CONSERVATION MEASURES ............................................................................................... 16
VIII.II GAS HEATED PORTABLE BUILDING ECMS ................................................................................................... 20
VIII.III ELECTRICALLY HEATED PORTABLE BUILDING ECMS ................................................................................ 21
VIII.IV ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION ....................................... 23
Appendices
Appendix A – Energy Benchmark Data
Appendix B – AkWarm Commercial Reports
Appendix C – Major Equipment List
Appendix D – Energy Conservation Measures – Wasilla High School
Appendix E – Energy Conservation Measures – Gas Heated Portable Buildings
Appendix F – Energy Conservation Measures – Electrically Heated Portable Buildings
Appendix G – Site Survey Photos
Appendix H – Thermographic Photos
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 ii AkWarm No. CIRI-IYS-CAEC-02
Abbreviations
AHFC Alaska Housing & Finance Corporation
ARRA American Recovery & Reinvestment Act
ASD Anchorage School District
ASHRAE American Society of Heating, Refrigeration, and Air-Conditioning Engineers
BTU British Thermal Unit
CCF One Hundred Cubic Feet
CFM Cubic Feet per Minute
DDC Direct Digital Control
ECI Energy Cost Index
ECM Energy Conservation Measure
EPDM Ethylene Propylene Diene Monomer
EUI Energy Utilization Index
F Fahrenheit
HP horsepower
HPS High Pressure Sodium
HVAC Heating, Ventilating, and Air-Conditioning
in inch(es)
IPLC Integrated Power & Load Circuit
kWh kilowatt-hour
LED Light-Emitting Diode
O&M Operations & Maintenance
sf square feet
SIR Savings-to-Investment Ratio
V Volts
W Watts
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 iii AkWarm No. CIRI-IYS-CAEC-02
List of Figures
Fig. 1 – Energy Audit Clients ....................................................................................................................... 1
Fig. 2 – Energy Benchmark Data .................................................................................................................. 1
Fig. 3 – Wasilla, Alaska – Google Maps ...................................................................................................... 5
Fig. 4 – Wasilla High School – Google Maps .............................................................................................. 5
List of Tables
Table 1 - Recommended Energy Conservation Measures, Wasilla High School ......................................... 2
Table 2 - Recommended Energy Conservation Measures, Gas Heated Portable Building .......................... 4
Table 3 - Recommended Energy Conservation Measures, Electrically Heated Portable Building .............. 4
Table 4 - Building History ............................................................................................................................ 8
Table 5 - Energy Cost and Consumption Data ........................................................................................... 13
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 iv AkWarm No. CIRI-IYS-CAEC-02
REPORT DISCLAIMER
Privacy
The information contained within this report, including any attachment(s), was produced under contract to Alaska
Housing Finance Corporation (AHFC). IGAs are the property of the State of Alaska, and may be incorporated into
AkWarm-C, the Alaska Retrofit Information System (ARIS), or other state and/or public information systems.
AkWarm-C is a building energy modeling software developed under contract by AHFC.
Limitations of Study
This energy audit is intended to identify and recommend potential areas of energy savings, estimate the value of the
savings, and provide an opinion of the costs to implement the recommendations. This audit meets the criteria of a
Level 2 Investment Grade Audit (IGA) per the American Society of Heating, Refrigeration, Air-conditioning
Engineers (ASHRAE) and the Association of Energy Engineers (AEE), and is valid for one year. The life of the IGA
may be extended on a case-by-case basis, at the discretion of AHFC. In preparing this report, the preparers acted
with the standard of care prevalent in this region for this type of work. All results are dependent on the quality of
input data provided. Not all data could be verified and no destructive testing or investigations were undertaken.
Some data may have been incomplete.
This report is not intended to be a final design document. Any modifications or changes made to a building to realize
the savings must be designed and implemented by licensed, experienced professionals in their fields. Lighting
upgrades should undergo a thorough lighting analysis to assure that the upgrades will comply with State of Alaska
Statutes as well as Illuminating Engineering Society (IES) recommendations. All liabilities for upgrades, including
but not limited to safety, design, and performance are incumbent upon the professional(s) who prepare the design.
Coffman Engineers, Inc (CEI) and Central Alaska Engineering Company (CAEC) bear no responsibility for work
performed as a result of this report.
Financial ratios may vary from those forecasted due to the uncertainty of the final installed design, configuration,
equipment selected, installation costs, related additional work, or the operating schedules and maintenance provided
by the owner. Furthermore, many ECMs are interactive, so implementation of one ECM may impact the
performance of another ECM. CEI and CAEC accept no liability for financial loss due to ECMs that fail to meet the
forecasted financial ratios.
The economic analyses for the ECMs relating to lighting improvements are based solely on energy savings.
Additional benefits may be realized in reduced maintenance cost, deferred maintenance, and improved lighting
quality. The new generation lighting systems have significantly longer life leading to long term labor savings,
especially in high areas like Gyms and exterior parking lots. Lighting upgrades displace re-lamping costs for any
fixtures whose lamps would otherwise be nearing the end of their lifecycle. This reduces maintenance costs for 3-7
years after the upgrade. An overall improvement in lighting quality, quantified by numerous studies, improves the
performance of students and workers in the built environment. New lighting systems can be designed to address all
of the above benefits.
US Government Disclaimer:
This material is based upon work supported by the Department of Energy under Award Number DE-EE0000095.
This report was prepared as an account of work sponsored by an agency of the United States Government. Neither
the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or
implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any
information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned
rights. Reference herein to any specific commercial product, process, or service by trade name, trademark,
manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring
by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not
necessarily state or reflect those of the United States Government or any agency thereof.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 1 AkWarm No. CIRI-IYS-CAEC-02
I. Executive Summary
This report presents the findings of an energy audit conducted at Wasilla High School as part of a contract
for:
Alaska Housing Finance Corporation
Contact: Rebekah Luhrs
4300 Boniface Parkway
Anchorage, AK 99510
Email: rluhrs@ahfc.us
Matanuska-Susitna Borough School District
Contact: Rick Jensen
501 N Gulkana Street
Palmer, AK 99645
Email: ricky.jensen@matsuk12.us
Fig. 1 – Energy Audit Clients
This audit was performed using American Recovery and Reinvestment Act (ARRA) funds to promote the
use of innovation and technology to solve energy and environmental problems in a way that improves the
State of Alaska’s economy. This can be achieved through the wiser and more efficient use of energy.
The average January 2009-December 2010 documented annual utility costs at this facility are as follows:
Electricity $246,645
Natural Gas $171,892
Total $418,537
January 2009-December 2010 Energy Utilization Index (EUI) = 121.8 kBtu/sf
January 2009-December 2010 Energy Cost Index = 1.98 $/sf
Fig. 2 – Energy Benchmark Data
Energy Conservation Measures (ECMs) calculated to be cost effective are shown below in the Executive
Summary Table with the energy analyst’s best opinion of probable cost, savings, and investment returns.
Be aware that the measures are not additive because of the interrelation of several of the measures. The
cost of each measure for this level of auditing is ± 30% until detailed engineering, specifications, and hard
proposals are obtained. See section VIII for detailed descriptions of all cost effective ECMs.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 2 AkWarm No. CIRI-IYS-CAEC-02
Table 1 - Recommended Energy Conservation Measures, Wasilla High School
Executive Summary – Recommended ECMs
Wasilla High School (WHS)
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
WHS-0a Refrigerators Replace residential & light
commercial
refrigerators/freezers older
than 5 years old
-- - <10
WHS-1 b Setback
Thermostat:
Classrooms/
Offices
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the school.
$18,000 $3,000 77.48 0.2
WHS-2 Lighting:
Gymnasium
Add new occupancy
sensors
$14,456 $3,600 58.67 0.2
WHS-3 Lighting:
Library
Add new occupancy
sensors
$530 $1,050 7.25 2.0
WHS-4 Lighting:
Restrooms
Add new occupancy
sensors
$756 $2,550 4.34 3.4
WHS-5 Lighting:
Pool
Fluorescent
Replace every T12 lighting
with T8's lamp in the Pool
section of the school and
provide occupancy sensors
where described.
$2,583 $10,500 3.59 4.1
WHS-6 Lighting:
Classrooms
Replace all T12 lighting
with T8 light fixtures and
add occupancy sensors.
Replace HID light fixtures
with fluorescent source
fixtures.
$6,961 $54,430 1.86 7.8
WHS-7 Lighting:
Pool High
Bay
Replace 400W Metal
Halide light fixtures with 6
lamp T5HO light fixtures.
$3,162 $25,200 1.83 8.0
WHS-8 Lighting:
Locker
Rooms
Replace the T12 light
fixtures with T8 fixtures
and provide occupancy
sensors.
$602 $4,850 1.81 8.1
WHS-9 Ventilation Install CO2 sensors and
Electric to Pneumatic
Transducers to the system.
Connect to DDC system.
$9,626 $77,700 1.60 8.1
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 3 AkWarm No. CIRI-IYS-CAEC-02
Executive Summary – Recommended ECMs
Wasilla High School (WHS)
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
WHS-10 Lighting:
Corridors
Replace all T12 lighting
with T8 light fixtures
$90 $750 1.76 8.3
WHS-11 Lighting:
Offices
Replace all T12 lighting
with T8 light fixtures and
add occupancy sensors and
remove night lights.
$667 $6,055 1.60 9.1
WHS-12 HVAC And
DHW
Install Pool Cover $1,767 $10,000 1.57 5.7
WHS-13 Lighting:
Auditorium
Replace (1) incandescent
lamps with a LED lamp
$3 $30 1.45 10.1
WHS-14 Air
Tightening
Perform air sealing to
reduce air leakage by 20%.
$6,973 $60,000 1.03 8.6
Notes:
a Due to advances in refrigerators in the previous 5 years, new Energy Star refrigerators are much more efficient and
result in viable energy savings.
b A night setback for the school exists, but will not come on unless the security system is armed. The security system
is not armed until the night janitors leave the school. This ECM models the possible achievable savings if the night
setback schedule is implemented.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 4 AkWarm No. CIRI-IYS-CAEC-02
Table 2 - Recommended Energy Conservation Measures, Gas Heated Portable Building
Executive Summary – Recommended Energy Conservation Measures (ECMs)
Gas Heated Portable Building (GPB)
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
GPB-1 Setback
Thermostat:
Classrooms
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Classrooms space.
$1,874 $7,000 3.37 3.7
GPB-2 Lighting:
Portable
Lighting
Replace all T12 lighting
with T8 light fixtures, and
replace the exterior HPS
fixtures with LED fixtures
$1,277 $17,200 1.09 13.5
GPB-3 Air
Tightening
Perform air sealing to
reduce air leakage by 20%.
$336 $2,700 1.09 8
Table 3 - Recommended Energy Conservation Measures, Electrically Heated Portable
Building
Executive Summary – Recommended Energy Conservation Measures (ECMs)
Electric Heated Portable Building (EPB)
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
EPB-1 Setback
Thermostat:
Classrooms
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Classrooms space.
$3,983 $10,000 4.68 2.5
EPB-2 Lighting:
Portable
Lighting
Replace all T12 lighting
with T8 light fixtures, and
replace the exterior HPS
fixtures with LED fixtures
$1,157 $15,200 1.11 13.1
EPB-3 Air
Tightening
Perform air sealing to
reduce air leakage by 30%.
$1,479 $12,000 1.04 8.1
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 5 AkWarm No. CIRI-IYS-CAEC-02
II. Introduction
This energy audit was conducted at Wasilla High School (WHS) for AHFC and the Matanuska-Susitna
Borough School District. The school is a 213,167 square foot (sf) campus that includes a 206,687 sf
school and 6,480 sf of portable classrooms. The school consists of classrooms, locker rooms, restrooms,
administrative offices, a library, a gymnasium, a pool, and 12 portable classrooms. The location of the
school is shown in the following regional and overhead images. The energy audit was conducted in order
to evaluate areas and equipment where energy savings can be realized. The savings are then compared to
a baseline and evaluated for reasonable project financial ratios and payback.
Fig. 3 – Wasilla, Alaska – Google Maps
Fig. 4 – Wasilla High School – Google Maps
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 6 AkWarm No. CIRI-IYS-CAEC-02
III. Energy Audit Process
Prior to visiting the school, the first task was to collect and review two years of utility data for electricity
and natural gas usage. This information was used to analyze operational characteristics, calculate energy
benchmarks for comparison to industry averages, estimate savings potential and establish a baseline to
monitor the effectiveness of implemented energy conservation measures. A spreadsheet was used to enter,
sum, and calculate benchmarks and to graph energy use information (see Appendix A). The primary
benchmark calculation used for comparison and baseline data is the Energy Utilization Index, or EUI (see
Section VI).
After gathering the utility data and calculating the EUI, the next step in the audit process was to review
the architectural and engineering drawings to develop a building profile which documented building age,
type, usage, and major energy consuming equipment or systems such as lighting, Heating, Ventilating,
and Air Conditioning (HVAC), water heating, refrigeration, snow-melt, and etc. The building profile is
utilized to generate, and answer, all possible questions regarding the facility’s energy usage. These
questions were then compared to the energy usage profiles developed during the utility data gathering
step. After this information was gathered, the next step in the process was to conduct a site survey.
A site survey was completed on December 30, 2011. The audit included inspecting the building systems
that impact energy consumption and answering questions from the preliminary review of the school. The
on-site contact during the investigation was Mr. Rick Jensen of the MSBSD Maintenance Department1.
The following information was also collected while on site: occupancy schedules, O&M practices,
building energy management program, and other information that has an impact on energy consumption.
The following energy audit includes an evaluation of the information gathered, the researching of possible
conservation opportunities, organizing the energy audit into a comprehensive report, and making ECM
recommendations for mechanical, electrical, and building envelope improvements.
1 Mr. Rick Jensen, (907) 354-0348 (mobile), (907) 864-2007 (office)
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 7 AkWarm No. CIRI-IYS-CAEC-02
IV. Method of Analysis
Having completed the preliminary energy audit tasks, Coffman Engineers, Inc., (CEI) conducted a site
survey. The site survey provides critical input in deciphering where energy savings opportunities exist
within a facility. The audit team from CEI walked the entire site to inventory and investigate the building
envelope and major equipment, including: HVAC, water heating, lighting, and equipment located in the
pool, the gym, kitchens, offices, and classrooms. An understanding of how the equipment is used is
determined during the site survey.
The collected data was entered into AkWarm Commercial™ software, an energy calculating program for
buildings. The data was processed by AkWarm to model a baseline from which ECMs could be
considered. The model was compared to actual utility costs to ensure the quality of the baseline and
proposed energy modeling performed by AkWarm. The recommended ECMs focus on the building
envelope, HVAC, lighting, water heating, and other electrical measures that will reduce annual energy
consumption.
ECMs are evaluated based on building use and processes, local climate conditions, building construction
type, function, operational schedule, existing conditions, and foreseen future plans. When new equipment
is proposed, energy consumption is calculated based on the manufacturer’s cataloged information. Energy
savings are calculated by AkWarm.
Implementation of more than one ECM often affects the savings of other ECMs. The savings may in
some cases be relatively higher for an ECM implemented individually than when that ECM is just one of
multiple recommended ECMs. For example, implementing reduced operating schedules of inefficient
lighting systems may result in a given savings. Also implementing a more efficient lighting system will
add to the savings, but less than the efficient lighting would alone because there is less energy to be saved
when the lights are on a reduced operating schedule. Thus, if multiple ECM’s are recommended, the
combined savings are calculated and identified appropriately in groups.
In Appendix D, Energy Conservation Measures, the simple lifetime calculation is shown for each ECM,
which is based on the typical life of the equipment being replaced or altered. The energy savings are
extrapolated throughout the simple lifetime of the ECM. The total energy savings is calculated as the total
lifetime multiplied by the yearly energy savings.
The cost savings and installation costs are used to calculate simple payback2 and the Savings to
Investment Ratio3 (SIR). These are listed in Appendix D and summarized in the Executive Summary
Table of this report. The SIR is calculated as a ratio by dividing the break even cost by the initial installed
cost. Cost savings is calculated based on the historical energy costs for the building. Installation costs
include labor and equipment to evaluate the initial investment required to implement an ECM. These are
applied to each recommendation with simple paybacks calculated. The energy analyst’s opinions of
probable cost are garnered from RS Means Cost Data, other industry publications, and local contractors
and suppliers. In addition, where applicable, maintenance cost savings are estimated and applied to the net
savings.
2 The simple payback is based on the years that it takes for the net savings to payback the net installation cost (Cost
divided by Savings).
3 Savings to Investment Ratio (SIR): Break Even Cost divided by initial installed cost, where Break-Even Cost is
how much can be spent and still have the measure be cost effective; it equals the Present Value (PV) of Savings over
the life of the measure minus PV of maintenance costs.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 8 AkWarm No. CIRI-IYS-CAEC-02
V. Building Description
Wasilla High School is a two story building with a variety of space usages and schedules. The original
school was built in 1976. Major changes made include a classroom wing addition in 1979 and the
replacement of the building mechanical heating systems in 2010. The facility is operated from 6 a.m. until
10 p.m., five days a week during the school year and is open on weekends for school sports, community
activities and pool usage. The pool is open year round for school sports and community usage. The school
year runs from late August through late May.
Wasilla High School has gone through a several changes throughout its history; including additions,
interior renovations, exterior renovations, and reroofing projects. A brief list of the major renovation
projects and years completed are shown below.
Table 4 - Building History
Wasilla High School – Building History*
Date Addition or Renovation
1976 Original Construction. Design completed 1977.
1979 Classroom Wing Addition
1983 Re‐roofing Project
2001 Re‐roofing Project
2010 Mechanical Room Upgrade –Boiler, Water Heater, and Pump Replacements
*History is based on available drawings from MSBSD.
V.I School Architectural Description
Wall, floor, and roof construction details were obtained from the architectural drawings and confirmed
during the site visit. The classroom walls are constructed of 1” stucco, ½” gypsum sheathing, 3.5” metal
studs on 16” centers with 3.5” fiberglass batt insulation, gypsum sheathing, and an infiltration barrier for
a composite R-value of R-16.2. The gymnasium walls are constructed of 1” stucco, gypsum sheathing,
3.5” batt insulation, a vapor barrier, and 12” concrete blocks for a composite R-value of R-13. The shop
areas and boiler room walls are constructed similarly to the gymnasium walls with the exception of using
10” concrete blocks. The composite R-value for these walls is R-11.2. Wall heights in most of the
building are 30 feet high. This wall height accounts for a suspended ceiling concealing ductwork and
mechanical heating equipment. There are areas in the building with taller exterior walls. The gym area has
a wall height of 30 feet, the pool wall height is 19 feet, and the metal shop and automotive shop areas
have 19 foot walls. The site visit, in addition to analysis of the construction drawings, shows that there is
a total of 115,152 sf of wall area.
Floor construction for the school consists of both below grade concrete floors and slab on grade floors.
Below grade floors, found in the basement area of the school, are un-insulated. The floor construction for
the remainder of the building is 4” concrete slab on grade with 1” rigid insulation extending 2’ below
grade. The school footprint is approximately 122,483 sf and the total usable area of the building is
206,687 sf. The usable square footage of the building is greater than the footprint since there is more than
one floor within the building envelope. This area also includes the dedicated fan and mechanical rooms
throughout the school.
The roof construction for the majority of the school consists of ballast pavers, two layers of 3” extruded
polystyrene rigid insulation, a vapor retarder, a thermal barrier, and metal roof decking. While the roof
insulation could not be accessed, it was estimated that the composite R-value for the roof system is R-27.
The roof construction over the pool and half of the classroom areas consist of ballast pavers, mortar-faced
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 9 AkWarm No. CIRI-IYS-CAEC-02
insulation board, 4” of extruded polystyrene rigid insulation, a vapor retarder, a thermal barrier, and metal
roof decking for a composite R-value of R-19.5. There is 124,322 sf of roofing on the school building.
Typical window construction consists of ½” air space, double pane glass with metal frames. Both fixed
windows and operable windows were observed. An insulating value of R-1.6 was estimated for all
windows. The greenhouse classroom windows and the cafeteria windows had an insulating value of R-1.6
as well. There is a total of 8,341 sf of window area.
The school has several different types of insulated exterior doors. The school has 15 insulated, solid metal
man doors (R-2.5), 14 insulated, glass doors (R-1.7), and one insulated overhead garage door (R-3.7).
There is a total of 1,070 sf of door area.
V.II Mechanical Description
The school building is heated by three gas-fired Burnham V1123 boilers, each with an input of 5,773
MBH. Each boiler is equipped with a Powerflame CR4-G-25 burner with a firing rate of 5773 MBH. The
boilers are connected to a boiler loop that delivers heat to the fin tubes, unit heaters, and hydronic heating
coils in the supply air fans. The boilers are about 12 years old and appear to be well maintained.
There are nine supply fans (SF) in the school that provide tempered ventilation air to the classrooms,
office spaces, the gymnasium, the weight room, the boiler room, and the kitchen. Due to the multiple
construction projects on Wasilla High School, many of the fans have the same fan number. In order to
distinguish the fans from each other in this report, the year that the fan was installed is put in parenthesis
after the fan name. Most supply fans utilize hydronic heating coils to heat the supply air, with the
exception of SF-2(1979). Fans SF-1(1977), SF-1(1979), and SF-4(1979) provide tempered air to the
classroom spaces. SF-2(1979) provides tempered air to the weight room while SF-2(1977) and SF-
3(1977) provide air to the gym and shop areas, respectively. Tempered air to the pool natatorium and
spectator areas is provided by SF-3(1979) and SF-5(1979). Relief air for the school is provided by relief
fans (RF) RF-1 and RF-2 as well as exhaust fans (EF) EF-24A through EF-24D. Descriptions of all fans
in the school are shown in Appendix C.
The domestic hot water for the building and kitchen area is supplied by two gas-fired PVI water heaters,
each with a storage capacity of 400 gallons and an input of 1200 MBH. Each water heater is equipped
with a Firepower burner with a firing rate of 1200 MBH. The domestic hot water from these water heaters
is re-circulated throughout the school using two Grundfos circulation pumps, P-19 and P-20. There are
also three Triangle Tube Smart 80 indirect water heaters located in the pool storage room, each with a
storage capacity of 76 gallons. The domestic hot water from these water heaters is used for the showers
and lavatories in the pool and is re-circulated using a Grundfos UP 25-64SF bronze in-line circulation
pump.
The school’s building energy management and control system is a hybrid Direct Digital Control (DDC)
and pneumatic system, using electronic/pneumatic (EP) transducers controlling pneumatic actuators.
Compressed air is provided by two air compressors. The system was observed to be in fair working order;
however, pneumatic systems are considered outdated due to the vast improvements in monitoring, control
and operating efficiencies available from the modern genre of DDC systems. The boilers are controlled by
a Siemens LNV Modulating Control System, which causes the boilers to fire based on a heat timer. When
a boiler reaches 50% of its capacity, the next boiler will fire. The school also utilizes a Direct Digital
Control (DDC) system to monitor the heating system.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 10 AkWarm No. CIRI-IYS-CAEC-02
V.III Electrical Description
The school is served by a 1200 Amp (A) trip, 2000A frame, 120/208 Volt (V), three-phase, four-wire,
underground electrical service connected to a pad-mounted utility transformer. The school has a 100
kilowatt (kW) standby diesel generator used to power selected loads in the event of a power outage.
The primary source of illumination in the Wasilla High School was originally provided by T12
fluorescent light fixtures with magnetic ballasts. Many of these original fixtures have been replaced or
retrofitted with fluorescent T8 light fixtures. The lighting levels throughout the school were observed to
be adequate and within the suggested lighting levels from the Illumination Engineering Society of North
America (IESNA). With the exception of the corridor, all of the lighting was observed to be controlled by
wall switches. The corridors are illuminated by a mix of fluorescent fixtures powered by the normal
power system and night light fixtures powered by the standby power system. Corridor lighting is
controlled by contactors that allow staff to shut the normal powered lights off while the spaces are
unoccupied.
High bay areas such as the gymnasium and one of the auto shop spaces are illuminated by T5HO high bay
light fixtures. High Pressure Sodium (HPS) fixtures are used in a second auto shop space and the outdoor
auto shop storage area. Metal halide (MH) light fixtures are used in the school’s weight room. About 15%
of the light fixtures present in the abovementioned high bay spaces are used as nightlights and are never
switched off. Long strike times are inherent with HPS and MH light fixtures and due to this feature the
lights are typically left switched on during extended periods of time for convenience, even if the space is
unoccupied.
The building mounted exterior lighting consists of 100W and 150W High Pressure Sodium (HPS) canopy
and wall pack lights. The HPS lighting in the parking lots and driveways has been upgraded within the
last few years with pole mounted 150W LED 'shoebox' type area lighters. The area lighters are present in
both single and twin headed configurations. All of the exterior lights are controlled by an on/off photo
switch that turns the lights off during the day, and a time clock that shuts the building mounted lights off
during the night at midnight, while the pole mounted light fixtures shut off at 10:00 pm. All of the
exterior lights switch back on at 5:00am.
Other electricity-using equipment not previously described in the mechanical or electrical sections include
a microwave, a walk in freezer and refrigerator, various other kitchen equipment, and various user
equipment such as projectors, computers, and printers.
V.IV Pool Equipment Description
The pool is served by filters, a pool circulating pump, three indirect domestic hot water heaters, an air
blower, and a plate and frame heat exchanger. Pool capacity is approximately 173,150 gallons, and it is
cycled through the filtration system approximately every 8 hours by the recirculation pump. Pool water
heating is accomplished by a plate and frame heat exchanger located in the pool equipment room that is
served by the school’s central heating system.
Ventilation and heat for the main pool area is provided by SF-3(1979) and SF-5(1979), both constant
volume supply fans. The office spaces and locker rooms receive tempered air through SF-6(1979), a
constant volume supply fan. Each of the locker rooms are equipped with a ¾ HP Trane Climate Changer
fan that provides both supply and exhaust air to the space. Air from the pool area is returned through
return air fan RA-1 and is recirculated through SF-3(1979). Exhaust air is removed by fan EF-12. Refer to
Appendix C for a detailed listing of all major equipment.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 11 AkWarm No. CIRI-IYS-CAEC-02
Lighting in the pool is provided by several 400W MH light fixtures mounted to the catwalk. These MH
fixtures remain on for the entire day due to the long re-strike time associated with MH light fixtures.
The pool's locker rooms are illuminated by four foot fluorescent T8 light fixtures. All other lighting for
the pool facility is provided by four foot and two foot U-tube T12 light fixtures. All of the light fixtures in
the pool facility are controlled by wall mounted rocker switches and were observed to remain illuminated
during the pools hours of operation.
V.V Outbuildings Description
There are a total of 12 portable classrooms on the Wasilla High School campus. Five of the portable
classrooms utilize electrical resistance heat while the remaining portables utilize a combination of gas and
electrical heat. They are occupied an average of five days per week during the school year from 7 a.m. to
3 p.m.
Although the exact construction details for the portables is unknown, it was estimated that the walls are
constructed with 2”x6” wood stud walls on 16” centers with R-21 batt insulation for a composite R-value
of R-18.2. The exterior faces of the walls have T1-11 siding. There is also plywood skirting around the
base of each portable. The skirting is constructed of 2x2 wood studs on 16” centers with an R-value of R-
2.8. There is a total of 14,976 sf of exterior wall area.
The portable buildings have above-grade floors resting on piles. Plywood skirting protects the piles and
floor construction from the weather. The floor is constructed of plywood flooring resting on 2”x8” wood
joists. The floor is insulated with 12” of R-38 batt insulation for an equivalent insulating R-value of R-41.
There is approximately 6,480 sf of total floor area.
Each portable is covered by a ventilated cold roof with shingles on top of plywood decking. It is
estimated that the roof is insulated with 12” of R-38 fiberglass batt insulation. There is a total of 6,681 sf
of roof area.
Each portable has four double paned, vinyl framed windows, each with an estimated R-value of R-2.0 per
window. There is a total of 1,056 sf of window area. Each portable has two insulated metal doors with an
effective R-value of R-2.5. There is a total of 504 sf of door area.
Five of the portable classrooms (20, 55, 57, 58, and 62) are heated using electrical resistance perimeter
baseboards and electrical unit heaters while the remaining portables use a combination of Rinnai direct
vent gas-fired wall furnaces and electrical resistance perimeter baseboards. The gas heated portables are
serviced using a sub-metered gas regulator. Most of the portable classrooms have a central programmable
thermostat. If a central thermostat is not present, each electrical resistance baseboard unit is connected to
a dedicated dial thermostat.
The five electrically heated portable classrooms (20, 55, 57, 58, and 62) are provided a 120/208V single
phase feed from the school building. The remaining portable classrooms are fed from a dedicated
electrical service separate from the school's electrical service. Each portable building is provided with a
small distribution panel where the feeder terminates. The distribution panel distributes power to the
portable's lighting, heating, and receptacles. The interior lighting in the 12 portables is provided by (56)
two-lamp T8 with electronic ballasts, and (136) two-lamp T12 light fixtures with magnetic ballasts. All of
the light fixtures are controlled by local wall switches. The exterior lighting consists of two 70W HPS
wall pack fixtures at the doorways of each portable and are controlled by an on off photo switch that turns
the fixtures off during the day.
Separate AkWarm models were created to model the two different types of the heated portable
classrooms. One model incorporated the energy usage for the five electrically heated portable units while
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 12 AkWarm No. CIRI-IYS-CAEC-02
the other modeled the energy usage of the seven gas heated portables. Per the request of the MSBSD, the
portable classroom units were modeled and included in the total energy usage of the school.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 13 AkWarm No. CIRI-IYS-CAEC-02
VI. Historic Energy Consumption and Cost
Tables provided in Appendix A, Energy Benchmark Data Report, represent the electric and natural gas
energy usage for the surveyed facility from January 2009 to December 2010. Matanuska Electric
Association provides the electricity and Enstar provides the natural gas to the building. Both utility
companies bill the facility using a commercial rate schedule. The actual utility bills were not provided to
be able to verify the data received to assure 100 percent accuracy of the data.
The AkWarm model of the facility was built to match the facility’s average annual electric and heating oil
consumption, so that a realistic model could be created. The monthly energy consumption of the AkWarm
model matches the actual average monthly consumption of the facility within 25%, which is adequate for
this level of modeling. Overall, the energy consumption trends of the AkWarm model and the actual
facility match appropriately. Graphical representations of the monthly energy consumption are included
in Appendix A.
VI.I Electrical Consumption Data
The electric utility costs consist of several components: a fixed monthly customer charge, an energy usage
charge, fuel surcharge, taxes, and a demand charge. The energy usage and fuel surcharge are based on the
customer's usage as measured in kilowatt-hours (kWh). The usage (kWh) is determined by load wattage
divided by 1,000, times hours running. For example, a 1,000 watt space heater operating for one hour will
use 1 kWh of electricity as would ten, 100 watt lamps operating for one hour or one, 100W lamp
operating for 10 hours. One kWh is equivalent to 3,413 BTU. Utility data used in this report reflects the
historical data provided for the building in a summarized format.
VI.II Natural Gas Consumption Data
The natural gas utility measures consumption and bills in CCF of natural gas, where one CCF equals 100
cubic feet of natural gas. The average heating value of natural gas is 1,000 BTUs per cubic foot, making 1
CCF equal to 100,000 BTUs or 1 Therm.
VI.III Overall Energy Consumption Data
The overall cost for energy use is calculated by dividing the total cost by the total usage. Based on the
electric and fuel oil utility data provided, the average cost for the energy and consumption calculations at
the surveyed facility are summarized in the table below. Data includes additional electricity and gas usage
for the 12 portable classrooms.
Table 5 - Energy Cost and Consumption Data
Energy Cost and Consumption Data
2009 2010 Average
Electric 0.14 $/kWh 0.11 $/kWh 0.12 $/kWh
Natural Gas 0.99 $/CCF 0.83 $/CCF 0.91 $/Gal
Total Cost $457,443 $379,631 $418,537
ECI 2.15 $/sf 1.78 $/sf 1.96 $/sf
Electric EUI 31.9 kBtu/sf 32.1 kBtu/sf 32.0 kBtu/sf
Natural Gas 88.8 kBtu/sf 88.7 kBtu/sf 88.7 kBtu/sf
Building EUI 120.7 kBtu/sf 120.8 kBtu/sf 120.7 kBtu/sf
The Energy Cost Index (ECI) is derived by dividing the annual cost by the building square footage. The
building square footage was calculated to be approximately 213,167 square feet. This area includes the
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 14 AkWarm No. CIRI-IYS-CAEC-02
206,687 sf school, the 3780 sf of gas heated portable classroom units, and the 2700 sf of electrically
heated portable classroom units.
The annual EUI is expressed in Thousands of British Thermal Units per Square Foot (kBtu/sf) and can be
used to compare energy consumption of similar building types or to track consumption from year to year
in the same building. The EUI is calculated by converting annual consumption of all fuels used to Btu’s
and then dividing by the area (gross conditioned square footage) of the building. EUI is a good indicator
of the relative potential for energy savings. A comparatively low EUI indicates less potential for large
energy savings. Building architectural, mechanical, and electrical drawings were obtained and utilized to
calculate and verify the gross area of the facility. The gross area was confirmed on the physical site
investigation.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 15 AkWarm No. CIRI-IYS-CAEC-02
VII. Equipment Inventory and Photo Survey
Following the completion of the field survey a detailed equipment list was created and is attached as
Appendix C. The major equipment listed are considered to be the major energy consuming equipment in
the building whose replacement could yield substantial energy savings.
An approximate age was assigned to the equipment if a manufactured date was not shown on the
equipment’s nameplate. As listed in the 2011 ASHRAE Handbook for HVAC Applications, Chapter 37,
Table 4, the service life for the equipment along with the remaining useful life in accordance to the
ASHRAE standard are also noted in the equipment list.
Where there are zero (0) years remaining in the estimated useful life of a piece of equipment, this is an
indication that maintenance costs are likely on the rise and more efficient replacement equipment is
available which will lower the operating costs of the unit. Maintenance costs should also fall with the
replacement.
Additionally, photos of various equipment and the building construction were taken during the site visit.
Several photos are included in Appendix G.
CEI made miscellaneous thermographic images of the building using a FLIR T300 Infrared Camera. This
is not a thermographic study, but rather just a few snapshots to illustrate easy-to-identify heat losses.
These thermographic photos are included in Appendix H.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 16 AkWarm No. CIRI-IYS-CAEC-02
VIII. Energy Conservation Measures
The following ECMs described here have been calculated by AkWarm Commercial and considered by the
energy audit team as viable projects. ECMs provided below are considered to have viable financial ratios
(SIR>1) or to add value to the building or building operational profiles. For a full list of ECMs considered
and calculated by the energy audit team, including ECMs not recommended at this time, please see
Appendix D.
VIII.I School Energy Conservation Measures
ECM# WHS-0 – Replace residential & light commercial refrigerators/freezers older than 5 years
old
Annual Energy Savings Installed Cost SIR Payback (years)
---<10 years
Due to advances in refrigerators in the previous five years, new Energy Star residential-type and light
commercial-type refrigerators and freezers are much more efficient and result in viable energy savings.
Built-in refrigerators and freezers should be evaluated independently. Replacing existing refrigerators,
which are older than five years old, with new energy star models will typically have paybacks of less than
10 years.
ECM# WHS-1 – Setback Thermostat for School
Annual Energy Savings Installed Cost SIR Payback (years)
$18,000 $3,000 77.48 0.2
Currently, there is a night-set back schedule for the school (not including the pool areas) that can lower
the building temperatures to 65F during unoccupied mode. However, there are night janitors occupying
the school until midnight or later, causing the night set-back schedule to be overridden. It is recommended
that the security system be reprogrammed so that the night setback can work as originally designed. Since
the school’s thermostats are already connected to the DDC system, the cost of this ECM only includes the
time required to re-program a night setback schedule and to set the setback temperature at 60F. This ECM
is a compilation of items 1, 3, and 8 in Appendix D, which are intended to be implemented concurrently.
Details of the individual items are shown in Appendix D.
ECM # WHS-2– Upgrade Gym Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$14,456 $3,600 58.67 0.2
The gymnasium is illuminated with approximately (48) 6-lamp T5HO light fixtures with electronic
ballasts. Unfortunately during the site visit the school's basketball team was practicing and the actual
control system could not be determined without affecting the practice. However these fixtures were
observed to be controlled by a bank wall switches, and no occupancy sensors were observed. It is
recommended that a sufficient number of wall mounted occupancy sensors with wire guards are installed
to switch the lights on when an occupant is detected in the gymnasium or the track. See item 2 in
Appendix D for more information.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 17 AkWarm No. CIRI-IYS-CAEC-02
ECM # WHS-3 – Upgrade Library Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$530 $1,050 7.25 2.0
The library and adjacent office rooms are illuminated by approximately (6) two-lamp and (72) three-lamp
4' fluorescent T8 light fixtures. Three of these light fixtures are used as night lights and are never
switched off. The only controls used in these areas are wall switches. This ECM includes installing five
occupancy sensors to shut the lights off while the space is unoccupied, and revising the wiring to switch
the (un-needed) nightlights with the local lighting circuits. See items 6, 11, 35, and 46 in Appendix D for
more information.
ECM # WHS-4 – Upgrade Restroom Lighting and Controls
Annual Energy Savings Installed Cost SIR Payback (years)
$756 $2,550 4.34 3.4
There are (17) restroom areas in the Wasilla High School. There are a combined total of 102 two-lamp T8
fluorescent light fixtures in these areas. It is recommended that one ceiling mounted occupancy sensor is
installed in each of the (17) restrooms to provide lighting control by switching the lights off when the
space is unoccupied. See items 21 and 32 in Appendix D for more information.
ECM # WHS-5 – Upgrade Pool Fluorescent Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$2,583 $10,500 3.59 4.1
This ECM covers the general use areas of the pool section of the school including the lobby, corridors,
vestibules, offices, restrooms, locker rooms and mechanical rooms, but excludes the natatorium. The
general use areas in the pool section of the school are primarily illuminated by four foot fluorescent light
fixtures. There are approximately (64) two-lamp T8, and (25) two-lamp 4' T12 fixtures, (8) four-lamp 4'
T12 fixtures, and (5) 4'x4' surface mounted six-lamp T12 fixtures. A single 2'x2' two-lamp U-lamp T12
light fixture is present. Two of the T8 and (4) of the two-lamp T12 fixtures are used as nightlights and are
never switched off.
It is recommended that the following lighting upgrades be completed:
Replace the 2'x2' U-lamp T12 troffer with a 2'x4' two-lamp T8 troffer with an electronic
program start ballast.
Replace the (14) two-lamp wrap and industrial style two-lamp T12 fixtures one-for-one
with two-lamp T8 fixtures with program start electronic ballasts.
Retrofit the (7) two-lamp and (8) four-lamp 2'x4' recessed troffers by replacing the lamps,
ballasts, and lamp holders to use T8 lamps and electronic program start ballasts.
Replace the (5) 4'x4' surface mounted six-lamp T12 fixtures with (10) three-lamp T8
fixtures with program start electronic ballast
Re-wire the nightlights to switch with the local lighting circuits.
Install approximately 22 new ceiling mounted occupancy sensors throughout the pool
facility for lighting control. It is not recommended that occupancy sensors be used for
lighting control in the mechanical rooms.
This description is for a compilation of several ECMs that are intended to be implemented at the same
time. However, due to constraints with the AkWarm modeling software, the different lighting
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 18 AkWarm No. CIRI-IYS-CAEC-02
configurations were modeled separately. See items 16, 17, 20, 24, 25, 28, and 54 in Appendix D for
details of individual measures.
Note – AkWarm measures with SIRs less than one were included in the compiled annual energy savings,
installed cost, SIR, and payback of this since the measures should be implemented concurrently.
ECM # WHS-6 – Upgrade Classroom Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$6,961 $54,430 1.86 7.8
The classrooms, auto shops and wood shop in the school are illuminated by 100W HPS surface mounted
canopy type fixtures, 400W MH and HPS down lights, and four foot fluorescent T5HO, T8, and T12
fixtures and 8' T12 fixtures. Of the (1063) fixtures observed, (11) were observed to be powered by the
standby electrical system and used as night lights, the remaining light fixtures are controlled by wall
mounted rocker switches.
It is recommended that the following lighting upgrades be completed:
Replace the (6) HPS light fixtures with LED canopy fixtures in the auto shop.
Replace (21) 400W HPS and MH light fixtures one-for-one with six-lamp fluorescent
T5HO light fixtures in the auto shops.
Replace (133) 4' two-lamp T12 suspended industrial light fixtures one-for-one with 4'
suspended two-lamp T8 light fixtures with electronic ballasts in the wood shop.
Replace (5) 8' two-lamp T12 suspended industrial light fixtures with (10) 4' suspended
two-lamp T8 light fixtures with electronic ballasts in the wood shop.
Replace (14) 4' two-lamp T12 wrap type light fixtures one-for-one with 4' wrap type two-
lamp T8 light fixtures with electronic ballasts.
Install (1) ceiling mounted occupancy sensors in each of the approximately (65)
classrooms (excluding shop classes) to control the 879 4' fluorescent light fixtures.
Though difficult to quantify, when a lighting upgrade is performed, the cost of relamping the affected
fixtures is deferred for any fixtures whose lamps would otherwise be nearing the end of their lifecycle.
This reduces maintenance costs for 3-7 years after the upgrade. Due to the critical nature of the shop
spaces it is not recommended that the wiring to the existing nightlights is not revised, and that occupancy
sensors are not installed to control the lighting.
This description is for a compilation of several ECMs that are intended to be implemented at the same
time. However, due to constraints with the AkWarm modeling software, the different lighting
configurations were modeled separately. See items 4, 5, 9, 10, 15, 18, 19, 22, 23, 26, 29, 30, 36, 40, 48,
50, 53, 56, 62, 65 and 66 in Appendix D for details of individual measures.
ECM # WHS-7– Upgrade Pool High-Bay Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$3,162 $25,200 1.83 8.0
The natatorium is illuminated by approximately (42) shoebox type 400W MH high bay light fixtures
mounted to a catwalk. These fixtures are controlled by wall mounted rocker switches and because of the
long strike time are rarely switched off while the pool is unoccupied during their operation hours. It is
recommended that each of the MH fixtures be replaced one-for-one with six-lamp T5HO light fixtures
listed for use in natatoriums. Aside from consuming less energy the fluorescent fixtures do not require as
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 19 AkWarm No. CIRI-IYS-CAEC-02
much time to strike and therefore are more convenient to switch more frequently. See item 34 in
Appendix D for more information.
ECM # WHS-8 – Upgrade Locker Room Lighting and Controls
Annual Energy Savings Installed Cost SIR Payback (years)
$602 $4,850 1.81 8.1
The primary source of illumination in the schools lockers rooms is provided by approximately (77) two-
lamp fluorescent T8 light fixtures, and (18) 23W Compact Fluorescent Lamps (CFL). In room 165 the
illumination is provided by (12) single-lamp T12 fluorescent light fixtures. One of the T12 and four of the
T8 light fixtures are also used as nightlights and are never switched off. It is recommended that ceiling
mounted occupancy sensors are installed in each of the (17) locker rooms and that the T12 fixtures are
replaced one-for-one with single-lamp T8 strip type fixtures. See items 13, 27, 37, 47, and 55 in
Appendix D for more information.
ECM # WHS-9– Install Carbon Dioxide Sensors
Annual Energy Savings Installed Cost SIR Payback (years)
$9,626 $77,700 1.60 8.1
Use CO2 sensors and demand ventilation control to reduce outside air rate. Currently, fixed OA rates are
used at approximately 20% on most supply fans. Heating the OA is a considerable energy cost. With
demand ventilation control, OA rates will vary from 0% - 100% based on indoor air quality conditions.
During unoccupied or low occupancy periods, outdoor air ventilation rates for SF-1(1977), SF-1(1979),
SF-2(1979), SF-2(1977), SF-3(1979), and SF-4(1979) would adjust proportionally to the occupancy rates
within those areas. The cost of this ECM includes the cost of installing six CO2 sensors, connecting the
sensors to the existing DDC system, and the cost for a DDC system contractor to program the sensors. A
DDC contractor will need to evaluate the existing DDC system to determine if other infrastructure
improvements are necessary. See item 38 in Appendix D for more information.
ECM # WHS-10 – Upgrade Corridor Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$90 $750 1.76 8.3
The corridors and lobbies in the school are illuminated by 4' fluorescent T8 and T12 fixtures.
Approximately 75% of these fixtures are controlled by occupancy sensors while the remaining fixtures
are powered by the standby electrical system and used as night lights. It is recommended that the (1) two-
lamp, and (4) three-lamp T12 fixtures be retrofitted by replacing the lamps, ballasts and lamp holders to
use T8 lamps and electronic program start ballasts. Additional savings may be experienced if the wiring is
revised to remove the nightlights from the standby electrical system and switch them with their local
lighting circuits, however this option was not modeled and the cost of this upgrade is not included in this
ECM. See items 33 and 44 in Appendix D for details of individual measures.
ECM # WHS-11 – Upgrade Office Lighting and Controls
Annual Energy Savings Installed Cost SIR Payback (years)
$667 $6,055 1.60 9.1
The office spaces in the school are illuminated by (112) 4' T8 and (5) 4' T12 fluorescent fixtures.
Approximately two of the T8 fixtures are used as nightlights and are powered by the standby electrical
system; the remaining fixtures are controlled by wall mounted rocker switches. It is recommended that the
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 20 AkWarm No. CIRI-IYS-CAEC-02
existing (2) two-lamp, and (3) three-lamp T12 fixtures are retrofitted to use T8 lamps and program start
electronic ballasts. Additionally, the wiring should be revised to switch the two nightlights with the local
lighting circuit and ceiling mounted occupancy sensors should be installed in each of the 34 offices to
control all of the light fixtures. See items 7, 12, 31, 41, 42, 45, 49, 52, and 57 in Appendix D for details of
individual measures.
ECM # WHS-12 – Install a Pool Cover for Use during Unoccupied Periods
Annual Energy Savings Installed Cost SIR Payback (years)
$1,767 $10,000 1.57 5.7
Indoor pools lose a significant amount of energy due to pool water evaporation. Evaporated pool water
requires additional ventilation air in order to control indoor humidity, in turn increasing the amount of
outdoor supply air that must be tempered. By installing a pool cover, the amount of evaporated water will
be minimized while the required ventilation to the space and the amount of pool make-up water will
decrease. Pool maintenance costs may also be reduced since pool covers aid in keeping dirt and debris out
of the pool. In an effort to conserve pool deck space, this ECM recommends purchase of a portable reel
storage system that is approximately 11 ft wide. Refer to item 39 in Appendix D for more information.
ECM # WHS-13 – Upgrade Auditorium Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$3 $30 1.45 10.1
There was only one incandescent lamp observed during the site visit. It was located in room 125, and is
controlled by a wall mounted rocker switch. It is recommended that this lamp be replaced with a LED or
CFL. See item 43 in Appendix D for more information.
Additional ECM's were considered for this area such as replacing the existing T12 fixtures with T8
fixtures but the usage schedule for some of these spaces is not high enough for the replacement to have a
SIR above 1.0
ECM # WHS-14 – Perform Air Sealing to Reduce Air Leakage by 20%
Annual Energy Savings Installed Cost SIR Payback (years)
$6,973 $60,000 1.03 8.6
Unconditioned infiltration air, leaking through doors, windows, and other building envelope penetrations
contributes to the heating required in the building. Methods to decrease the infiltration into the building
include: sealing around roof and wall penetrations with caulking and insulation, gasketing mechanical
louvers or hoods, providing gaskets to all exterior cover plates, and adding weather stripping around
exterior doors. To achieve a viable economic benefit, up to $75,000 can be invested and still achieve an
SIR ≥ 1by reducing air leakage by 20%. See item 51 in Appendix D for more information.
VIII.II Gas Heated Portable Building ECMs
The following ECMs described here have been calculated by AkWarm Commercial and considered by the
energy audit team as viable projects. ECMs provided below are considered to have viable financial ratios
(SIR>1) or to add value to the building or building operational profiles. For a full list of ECMs considered
and calculated by the energy audit team, including ECMs not recommended at this time, please see
Appendix E. The following ECMs were calculated using a model that incorporated all gas heated
portable units into one model. The following costs and energy savings will need to be divided by
seven in order to determine individual portable building energy savings and costs.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 21 AkWarm No. CIRI-IYS-CAEC-02
ECM #GPB-1 – Setback Thermostat for Portable Classrooms
Annual Energy Savings Installed Cost SIR Payback (years)
$1,874 $7,000 3.37 3.7
Currently, there is a night-set back schedule for the portables that can lower the building temperatures to
65F during unoccupied mode. However, many of the thermostats are set to “HOLD”, causing the night
set-back schedule to be overridden. Since the portables’ thermostats are already programmed with a night
set-back temperature, the cost of this ECM only includes the time required to re-program a night setback
schedule and set the temperature to 60F. See item 3 in Appendix E.
ECM #GPB-2 – Upgrade Portable Building Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$1,277 $17,200 1.09 13.5
The interior lighting in the portables is currently illuminated by (42) two-lamp fluorescent T8 with
electronic ballasts and (68) two-lamp fluorescent T12 light fixtures with magnetic ballasts. The T12
fixtures should be replaced one-for-one with two-lamp T8 fluorescent wrap type light fixtures with
electronic program start ballasts. It is also recommended that each of the (7) portables be provided with a
new ceiling mounted occupancy sensor to switch the lights off when the space is unoccupied.
Additionally, the two each HPS fixtures used for exterior illumination should be replaced with a 35W
LED fixture on each portable building.
This description is for a compilation of several ECMs that are intended to be implemented at the same
time, however due to constraints with the AkWarm modeling software the different lighting
configurations were modeled separately. See items 1, 4, and 5 in Appendix E for details of individual
measures.
ECM #GPB-3 – Perform Air Sealing to Reduce Air Leakage by 20%
Annual Energy Savings Installed Cost SIR Payback (years)
$336 $2,700 1.09 8
Unconditioned infiltration air, leaking through doors, windows, and other building envelope penetrations
contributes to the heating required in the building. Methods to decrease the infiltration into the building
include: sealing around roof and wall penetrations with caulking and insulation, providing gaskets to all
exterior cover plates, and adding weather stripping around exterior doors. To achieve a viable economic
benefit, up to $2,000 can be invested and still achieve an SIR ≥ 1by reducing air leakage by 30%. See
item 2 in Appendix E for more information.
VIII.III Electrically Heated Portable Building ECMs
The following ECMs described here have been calculated by AkWarm Commercial and considered by the
energy audit team as viable projects. ECMs provided below are considered to have viable financial ratios
(SIR>1) or to add value to the building or building operational profiles. For a full list of ECMs considered
and calculated by the energy audit team, including ECMs not recommended at this time, please see
Appendix F. The following ECMs were calculated using a model that incorporated all electrically
heated portable units into one model. The following costs and energy savings will need to be divided
by five in order to determine individual portable building energy savings and costs.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 22 AkWarm No. CIRI-IYS-CAEC-02
0ECM #EPB-1 – Setback Thermostat for Portable Classrooms
Annual Energy Savings Installed Cost SIR Payback (years)
$3,983 $10,000 4.68 2.5
Currently, there is a night set-back schedule for some of the portables that can lower the building
temperature to 65F during unoccupied periods using a digital thermostat. However, the remainder of the
thermostats are dial thermostat that are not capable of an automatic night set-back schedule. The installed
cost shown includes installing a new programmable thermostat, connecting it to the electrical heating
equipment, and programming a night set-back schedule at a cost of $2,000 per portable classroom. The
setback temperature for the portables would be set at 60F. See item 1 in Appendix F.
ECM #EPB-2 – Upgrade Portable Building Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$1,157 $15,200 1.11 13.1
The interior lighting in the portables is currently illuminated by (14) two-lamp fluorescent T8 with
electronic ballasts and (68) two-lamp fluorescent T12 light fixtures with magnetic ballasts. The T12
fixtures should be replaced one-for-one with two-lamp T8 fluorescent wrap type light fixtures with
electronic program start ballasts. It is also recommended that each of the (5) portables be provided with a
new ceiling mounted occupancy sensor to switch the lights off when the space is unoccupied.
Additionally the two each HPS fixtures used for exterior illumination should be replaced with a 35W
LED fixture on each portable building.
This description is for a compilation of several ECMs that are intended to be implemented at the same
time, however due to constraints with the AkWarm modeling software the different lighting
configurations were modeled separately. See items 2, 3, and 5 in Appendix F for details of individual
measures.
ECM #EPB-3 – Perform Air Sealing to Reduce Air Leakage by 30%
Annual Energy Savings Installed Cost SIR Payback (years)
$1,479 $12,000 1.04 8.1
Unconditioned infiltration air, leaking through doors, windows, and other building envelope penetrations
contributes to the heating required in the building. Methods to decrease the infiltration into the building
include: sealing around roof and wall penetrations with caulking and insulation, providing gaskets to all
exterior cover plates, and adding weather stripping around exterior doors. To achieve a viable economic
benefit, up to $12,000 can be invested and still achieve an SIR ≥ 1by reducing air leakage by 30%. See
item 4 in Appendix F for more information.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 23 AkWarm No. CIRI-IYS-CAEC-02
VIII.IV Administrative Controls for Energy Conservation and Optimization
While the intent of many energy conservation measures is to increase the efficiency of fuel-burning and
electrical equipment, an important factor of energy consumption lies in the operational profiles which
control the equipment usage. Such profiles can be managed by administrative controls and departmental
leadership. They determine how and when fuel-burning and electrical equipment are used, and therefore
have a greater impact on energy savings potential than simply equipment upgrades alone. Significant
energy cost savings can be realized when ECMs are combined with efficient-minded operational profiles.
Operational profiles may be outlined by organization policy or developed naturally or historically. These
profiles include, but are not limited to: operating schedules, equipment setpoints and control strategies,
maintenance schedules, and site and equipment selection.
Optimization of operational profiles can be accomplished by numerous methods so long as the intent is
reduction in energy-using equipment runtime. Due to the numerous methods of optimization, energy cost
savings solely as a result of operational optimization are difficult to predict. Quantification, however, is
easy to accomplish by metering energy usage during and/or after implementation of energy-saving
operational profiles and ECMs. Shown below are some examples which have proven successful for other
organizations.
Optimization of site selection includes scheduling and location of events. If several buildings in a given
neighborhood are all lightly used after regularly occupied hours, energy savings can be found when after-
hours events are consolidated and held within the most energy efficient buildings available for use. As a
result, unoccupied buildings could be shut down to the greatest extent possible to reduce energy
consumption.
Two operational behaviors which can be combined with equipment upgrades are operating schedules and
equipment control strategies including setpoints. Occupancy and daylight sensors can be programmed to
automatically shut off or dim lighting when rooms are unoccupied or sufficiently lit from the sun.
Operating schedules can be optimized to run equipment only during regular or high-occupancy periods.
Also, through a central control system, or with digital programmable thermostats, temperature setpoints
can be reduced during low-occupancy hours to maximize savings. In addition, sporadically used
equipment can be shut down during unoccupied hours to further save energy. In general, having
equipment operating in areas where no occupants are present is inefficient, and presents an opportunity
for energy savings.
Operational profiles can also be implemented to take advantage of no- or low-cost ECMs. Examples
include heating plant optimizations (boiler section cleaning, boiler flush-through cleaning) and tighter
controls of equipment setbacks and shutdowns (unoccupied zones equipment shutdown, easier access to
and finer control of equipment for after-hours control). In a large facility management program,
implementation of these measures across many or all sites will realize dramatic savings due to the
quantity of equipment involved.
Changes to building operational profiles can only be realized while simultaneously addressing health,
safety, user comfort, and user requirements first. It is impractical to expect users to occupy a building or
implement operational behaviors which do not meet such considerations. That said, it is quite practical for
management groups to implement administrative controls which reduce losses brought about by excess
and sub-optimum usage.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Appendix A
Energy Benchmark Data
Wasilla High School Draft Energy Audit Report
First Name Last Name Middle Name Phone
Rick Jensen 907‐376‐0806
State Zip
AK 99645
Monday‐
Friday
Saturday Sunday Holidays
7 am‐ 8pm 0 0 0
Average # of
Occupants
During
1372 0 0 0
Renovations / Notes
Date
1980
99654
Email
ricky.jensen@matsuk12.us
Palmer501 N. Gulkana St
Details
Facility Zip
Mailing Address
Contact Person
Primary
Operating
Hours
City
Unknown Renovations Completed.
REAL Preliminary Benchmark Data Form
PART I – FACILITY INFORMATION
Facility Owner
Mat‐Su School District
Facility Owned By Date
03/05/11Municipal Government/Subdivision
Building Square Footage
701 E. Bogard Rd.
Wasilla High Education 213,167
Year Built
1976
Building Type
School
Community Population
Building Name/ Identifier Building Usage
Facility City
Wasilla
88,379
Facility Address
Notes
PART II – ENERGY SOURCES
Heating Oil Electricity Natural Gas Propane Wood Coal
$ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton
Other energy
sources?
1. Please check every energy source you use in the table below. If known, please enter the base rate you pay
for the energy source.
2. Provide utilities bills for the most recent two‐year period for each energy source you use.
Any available drawings are kept at district office for maintenance.
Coffman Engineers, Inc.AkWarm No. CIRI-IYS-CAEC-02
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-IYS-CAEC-02
Wasilla High School Draft Energy Audit Report
Wasilla High
Buiding Size Input (sf) =213,167
2009 Natural Gas Consumption (Therms)189,196
2009 Natural Gas Cost ($)186,316
2009 Electric Consumption (kWh)1,993,520
2009 Electric Cost ($)271,126
2009 Total Energy Use (kBtu)25,723,514
2009 Total Energy Cost ($)457,443
Annual Energy Use Intensity (EUI)
2009 Natural Gas (kBtu/sf) 88.8
2009 Electricity (kBtu/sf)31.9
2009 Energy Utilization Index (kBtu/sf)120.7
Annual Energy Cost Index (ECI)
2009 Natural Gas Cost Index ($/sf)0.87
2009 Electric Cost Index ($/sf)1.27
2009 Energy Cost Index ($/sf)2.15
2010 Natural Gas Consumption (Therms)189,146
2010 Natural Gas Cost ($)157,467
2010 Electric Consumption (kWh)2,002,080p(),,
2010 Electric Cost ($)222,163
2010 Total Energy Use (kBtu)25,747,709
2010 Total Energy Cost ($)379,631
Annual Energy Use Intensity (EUI)
2010 Natural Gas (kBtu/sf)88.7
2010 Electricity (kBtu/sf)32.1
2010 Energy Utilization Index (kBtu/sf)120.8
Annual Energy Cost Index (ECI)
2010 Natural Gas Cost Index ($/sf)0.74
2010 Electric Cost Index ($/sf)1.04
20010 Energy Cost Index ($/sf)1.78
Note:
1 kWh = 3,413 Btu's
1 Therm = 100,000 Btu's
1 CF ≈ 1,000 Btu's
Coffman Engineers, Inc.AkWarm No. CIRI-IYS-CAEC-02
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-IYS-CAEC-02
Wasilla High SchoolDraft Energy Audit ReportWasilla HighNatural GasBtus/CCF =100,000Provider Customer #Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)ENSTARG46700 Jan‐09 1/5/2009 2/4/2009 30 23,166 23,166 $23,304 $1.01ENSTARG46700 Feb‐09 2/4/2009 3/5/2009 29 21,090 21,090 $21,222 $1.01ENSTARG46700 Mar‐09 3/5/2009 4/3/2009 29 18,304 18,304 $18,428 $1.01ENSTARG46700 Apr‐09 4/3/2009 5/5/2009 32 15,563 15,563 $15,678 $1.01ENSTARG46700 May‐09 5/5/2009 6/5/2009 31 10,799 10,799 $10,899 $1.01ENSTARG46700 Jun‐09 6/5/2009 7/6/2009 31 7,216 7,216 $7,314 $1.01ENSTARG46700 Jul‐09 7/6/2009 8/4/2009 29 6,615 6,615 $6,711 $1.01ENSTARG46700 Aug‐09 8/4/2009 9/4/2009 31 10,241 10,241 $10,348 $1.01ENSTARG46700 Sep‐09 9/4/2009 10/5/2009 31 12,731 12,731 $12,847 $1.01ENSTARG46700 Oct‐09 10/5/2009 11/4/2009 30 16,434 16,434 $16,563 $1.01ENSTARG46700 Nov‐09 11/4/2009 12/4/2009 30 22,318 22,318 $22,468 $1.01ENSTARG46700 Dec‐09 12/4/2009 1/4/2010 31 24,722 24,722 $20,535 $0.83ENSTARG46700 Jan‐10 1/4/2010 2/2/2010 29 21,150 21,150 $17,580 $0.83ENSTARG46700 Feb‐10 2/2/2010 3/3/2010 29 18,840 18,840 $15,667 $0.83ENSTARG46700 Mar‐10 3/3/2010 3/31/2010 28 18,961 18,961 $15,914 $0.84ENSTARG46700 Apr‐10 3/31/2010 4/30/2010 30 15,605 15,605 $13,111 $0.84ENSTARG46700 May‐10 4/30/2010 6/3/2010 34 12,774 12,774 $10,745 $0.84ENSTARG46700Jun‐106/3/20106/30/2010278 8758 875$7 489$0 84ENSTARG46700Jun106/3/20106/30/2010278,8758,875$7,489$0.84ENSTARG46700 Jul‐10 6/30/2010 7/28/2010 28 8,353 8,353 $7,054 $0.84ENSTARG46700 Aug‐10 7/28/2010 8/30/2010 33 9,536 9,536 $8,004 $0.84ENSTARG46700 Sep‐10 8/30/2010 9/28/2010 29 11,408 11,408 $9,501 $0.83ENSTARG46700 Oct‐10 9/28/2010 10/27/2010 29 13,152 13,152 $10,896 $0.83ENSTARG46700 Nov‐10 10/27/2010 12/1/2010 35 21,284 21,284 $17,401 $0.82ENSTARG46700 Dec‐10 12/1/2010 1/4/2011 34 29,208 29,208 $24,104 $0.83Jan ‐ 09 to Dec ‐ 09 total:189,196189,1960$186,316$0Jan ‐ 10 to Dec ‐ 10 total:189,146189,1460$157,467$0$0.99$0.83Jan ‐ 10 to Dec ‐ 10 avg:Jan ‐ 09 to Dec ‐ 09 avg:Coffman Engineers, Inc.AkWarm No. CIRI-IYS-CAEC-02Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-IYS-CAEC-02
Wasilla High SchoolDraft Energy Audit Report$10,000 $15,000 $20,000 $25,000 $30,000 15,00020,00025,00030,00035,000Natural Gas Cost ($)Natural Gas Consumption (Therms)Wasilla High ‐Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)Natural Gas Consumption (Therms)Natural Gas Cost ($)$0 $5,000 05,00010,000Jan‐09Feb‐09Mar‐09Apr‐09May‐09Jun‐09Jul‐09Aug‐09Sep‐09Oct‐09Nov‐09Dec‐09Jan‐10Feb‐10Mar‐10Apr‐10May‐10Jun‐10Jul‐10Aug‐10Sep‐10Oct‐10Nov‐10Dec‐10Date (Mon ‐Yr)Coffman Engineers, Inc.AkWarm No. CIRI-IYS-CAEC-02Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-IYS-CAEC-02
Wasilla High SchoolDraft Energy Audit ReportWasilla HighElectricityBtus/kWh =3,413Provider Customer #Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)MEA E82000 Jan‐09 12/28/2008 1/27/200930186,0006,348495$27,745$0.15MEA E82000 Feb‐09 1/27/2009 2/25/200929181,2006,184486$27,048$0.15MEA E82000 Mar‐09 2/25/2009 3/25/200928176,1606,012480$26,334$0.15MEA E82000 Apr‐09 3/25/2009 4/27/200933197,6006,744487$26,764$0.14MEA E82000 May‐09 4/27/2009 5/27/200930161,6805,518488$22,344$0.14MEA E82000 Jun‐09 5/27/2009 6/28/20093294,5603,227343$13,363$0.14MEA E82000 Jul‐09 6/28/2009 7/28/20093090,1603,077321$12,058$0.13MEA E82000 Aug‐09 7/28/2009 8/26/200929147,0405,018564$19,848$0.13MEA E82000 Sep‐09 8/26/2009 9/27/200932182,1606,217557$23,884$0.13MEA E82000 Oct‐09 9/27/2009 10/28/200931180,7206,168584$22,866$0.13MEA E82000 Nov‐09 10/28/2009 11/26/200929208,8007,126507$25,577$0.12MEA E82000 Dec‐09 11/26/2009 12/27/200931187,4406,397522$23,297$0.12MEA E82000 Jan‐10 12/27/2009 1/26/201030190,0806,487504$21,678$0.11MEA E82000 Feb‐10 1/26/2010 2/22/201027167,0405,701504$19,365$0.12MEA E82000 Mar‐10 2/22/2010 3/28/201034212,6407,257693$24,909$0.12MEA E82000 Apr‐10 3/28/2010 4/27/201030182,6406,234477$19,261$0.11MEA E82000 May‐10 4/27/2010 5/25/201028153,5205,240488$16,646$0.11MEAE82000Jun‐105/25/20106/27/201033104 4003 563293$11 125$0 11MEAE82000Jun105/25/20106/27/201033104,4003,563293$11,125$0.11MEA E82000 Jul‐10 6/27/2010 7/28/2010 31 92,240 3,148 315 $10,190 $0.11MEA E82000 Aug‐10 7/28/2010 8/28/2010 31 140,160 4,784 550 $15,846 $0.11MEA E82000 Sep‐10 8/28/2010 9/27/2010 30 173,200 5,911 558 $18,934 $0.11MEA E82000 Oct‐10 9/27/2010 10/26/2010 29 185,120 6,318 480 $20,352 $0.11MEA E82000 Nov‐10 10/26/2010 11/28/2010 33 204,000 6,963 492 $22,231 $0.11MEA E82000 Dec‐10 11/28/2010 12/27/2010 29 197,040 6,725 504 $21,625 $0.11Jan ‐ 09 to Dec ‐ 09 total:1,993,52068,0395,834$271,126$0Jan ‐ 10 to Dec ‐ 10 total:2,002,08068,3315,858$222,163$0$0.14$0.11Jan ‐ 10 to Dec ‐ 10 avg:Jan ‐ 09 to Dec ‐ 09 avg:Coffman Engineers, Inc.AkWarm No. CIRI-IYS-CAEC-02Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-IYS-CAEC-02
Wasilla High SchoolDraft Energy Audit Report$10,000$15,000$20,000$25,000$30,000100,000150,000200,000250,000Electric Cost ($)Electric Consumption (kWh)Wasilla High ‐Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)$0$5,000050,000Date (Mon ‐Yr)Coffman Engineers, Inc.AkWarm No. CIRI-IYS-CAEC-02Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-IYS-CAEC-02
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Appendix B
AkWarm Commercial Reports
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Wasilla High School
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 3/2/2012 9:38 AM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Wasilla HS Auditor Company: Coffman Engineers, Inc.
Address: 701 E Bogard Road Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Wasilla Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Rick Jensen
Client Address: 501 N Gulkana St.
Palmer AK, 99645
Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-504
Client Phone: (907) 376-0806 Auditor Comment:
Client FAX:
Design Data
Building Area: 206,687 square feet Design Heating Load: Design Loss at Space:
4,205,347 Btu/hour
with Distribution Losses: 4,427,633 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency
and 25% Safety Margin: 6,749,440 Btu/hour
Note: Additional Capacity should be added for DHW
load, if served.
Typical Occupancy: 1,372 people Design Indoor Temperature: 71.5 deg F (building
average)
Actual City: Wasilla Design Outdoor Temperature: -18 deg F
Weather/Fuel City: Wasilla Heating Degree Days: 10,810 deg F-days
Utility Information
Electric Utility: Matanuska Electric Assn. -
Commercial - Lg
Natural Gas Provider: Enstar Natural Gas -
Commercial - Lg
Average Annual Cost/kWh: $0.120/kWh Average Annual Cost/ccf: $0.910/ccf
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 High School Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Other Electrical Cooking Clothes Drying Vent Fans Service Fees Total Cost Existing Building $148,171 $0 $23,464 $88,154 $73,788 $0 $0 $63,495 $0 $397,072 With Proposed Retrofits $112,134 $0 $23,464 $57,045 $73,788 $0 $0 $63,495 $0 $329,926 SAVINGS $36,038 $0 $0 $31,109 $0 $0 $0 $0 $0 $67,147
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 High School
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 High School $0$100,000$200,000$300,000$400,000Existing RetrofitNatural GasElectricityAnnual Energy Costs by Fuel
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 High School
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 High School Annual Modeled Consumption (Blue) compared to Actual Electric (Left) and Natural Gas (Right) Consumption (Orange).
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 High School Monthly Modeled Electric Consumption (Blue) compared to Actual Electric Consumption (Orange).
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 High School Monthly Modeled Consumption Gas(Blue compared to Actual Natural Gas Consumption (Orange).
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Gas Heated Portable Buildings
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 3/2/2012 2:27 PM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Wasilla High School - Gas Portable
Buildings
Auditor Company: Coffman Engineers, Inc.
Address: 701 E Bogard Road Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Wasilla Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Rick Jensen
Client Address: 501 N Gulkana St.
Palmer AK, 99645
Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-5042
Client Phone: (907) 376-0806 Auditor Comment:
Client FAX:
Design Data
Building Area: 3,780 square feet. This area is for
the gas heated portable classrooms.
Design Heating Load: Design Loss at Space: 172,793
Btu/hour
with Distribution Losses: 191,992 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency and
25% Safety Margin: 292,671 Btu/hour
Note: Additional Capacity should be added for DHW load,
if served.
Typical Occupancy: 0 people Design Indoor Temperature: 70 deg F (building average)
Actual City: Wasilla Design Outdoor Temperature: -18 deg F
Weather/Fuel City: Wasilla Heating Degree Days: 10,810 deg F-days
Utility Information Natural Gas Provider: Enstar Natural Gas - Commercial -
Lg
Electric Utility: Matanuska Electric Assn. -
Commercial - Lg
Natural Gas Provider: Enstar Natural Gas - Commercial -
Lg
Average Annual Cost/kWh: $0.120/kWh Average Annual Cost/ccf: $0.910/ccf
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 Gas Heated Portable Buildings Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Refrigeration Other Electrical Cooking Clothes Drying Ventilation Fans Service Fees Total Cost Existing Building $8,528 $0 $0 $2,643 $0 $0 $0 $0 $0 $0 $11,171 With Proposed Retrofits $6,319 $0 $0 $1,367 $0 $0 $0 $0 $0 $0 $7,685 SAVINGS $2,209 $0 $0 $1,277 $0 $0 $0 $0 $0 $0 $3,486
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 Gas Heated Portable Buildings
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 Gas Heated Portable Buildings $0$2,000$4,000$6,000$8,000$10,000$12,000Existing RetrofitNatural GasElectricityAnnual Energy Costs by Fuel
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 Gas Heated Portable Buildings
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Electrically Heated Portable Buildings
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 3/2/2012 2:27 PM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Wasilla High School - Electric Portable
Buildings
Auditor Company: Coffman Engineers, Inc.
Address: 701 E Bogard Road Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Wasilla Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Rick Jensen
Client Address: 501 N Gulkana St.
Palmer AK, 99645
Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-5042
Client Phone: (907) 376-0806 Auditor Comment:
Client FAX:
Design Data
Building Area: 2,700 square feet. This area is for
the electrically heated portable classrooms.
Design Heating Load: Design Loss at Space: 144,757
Btu/hour
with Distribution Losses: 144,757 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency and
25% Safety Margin: 220,666 Btu/hour
Note: Additional Capacity should be added for DHW load,
if served.
Typical Occupancy: 0 people Design Indoor Temperature: 70 deg F (building average)
Actual City: Wasilla Design Outdoor Temperature: -18 deg F
Weather/Fuel City: Wasilla Heating Degree Days: 10,810 deg F-days
Utility Information
Electric Utility: Matanuska Electric Assn. -
Commercial - Lg
Natural Gas Provider: Enstar Natural Gas - Commercial -
Lg
Average Annual Cost/kWh: $0.120/kWh Average Annual Cost/ccf: $0.000/ccf
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 Electrically Heated Portable Buildings Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Refrigeration Other Electrical Cooking Clothes Drying Ventilation Fans Service Fees Total Cost Existing Building $17,139 $0 $0 $2,230 $0 $0 $0 $0 $0 $0 $19,369 With Proposed Retrofits $11,677 $0 $0 $1,073 $0 $0 $0 $0 $0 $0 $12,750 SAVINGS $5,462 $0 $0 $1,157 $0 $0 $0 $0 $0 $0 $6,619
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 Electrically Heated Portable Buildings
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 Electrically Heated Portable Buildings
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 Electrically Heated Portable Buildings $0$2,000$4,000$6,000$8,000FloorWall/DoorWindowCeilingAirExistingRetrofitAnnual Space Heating Cost by Component
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Appendix C
Major Equipment List
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE (HP) ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) B-1 BOILER RM BUILDING HEATING BURNHAM V1123 CAST IRON NATURAL GAS 5773 MBH ≈ 84% - 30 ≈ 18 B-2 BOILER RM BUILDING HEATING BURNHAM V1123 CAST IRON NATURAL GAS 5773 MBH ≈ 84% - 30 ≈ 18 B-3 MAINT. BLDG. BUILDING HEATING BURNHAM V1123 CAST IRON NATURAL GAS 5773 MBH ≈ 84% - 30 ≈ 18 WH-1 BOILER RM. DOMESTIC HOT WATER PVI 1500 P 400A-TP NATURAL GAS 1200 MBH ≈ 84% 1/2 30 ≈ 18 WH-2 BOILER RM. DOMESTIC HOT WATER PVI 1500 P 400A-TP NATURAL GAS 1200 MBH ≈ 84% 1/2 30 ≈ 18 WH-3 POOL JANITOR CLOSET DOMESTIC HOT WATER TRIANGLE TUBE SMART 80 INDIRECT - - - 30 ≈ 18 WH-4 POOL JANITOR CLOSET DOMESTIC HOT WATER TRIANGLE TUBE SMART 80 INDIRECT - - - 30 ≈ 18 WH-5 POOL JANITOR CLOSET DOMESTIC HOT WATER TRIANGLE TUBE SMART 80 INDIRECT - - - 30 ≈ 18 P-1 BOILER RM BOILER WATER CIRC GRUNDFOS UGA INLINE 237GPM 31' 82.5 3 10 0 P-2 BOILER RM BOILER WATER CIRC GRUNDFOS UGA INLINE 237GPM 31' 82.5 3 10 0 P-3 BOILER RM BOILER WATER CIRC GRUNDFOS UGA INLINE 237GPM 31' 82.5 3 10 0 P-4 BOILER RM HEATING WATER CIRC GRUNDFOS UGA BASE MOUNTED 185GPM 73' 87.5 5 W/VFD 10 0
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE (HP) ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) P-5 BOILER RM HEATING WATER CIRC GRUNDFOS UGA BASE MOUNTED 185GPM 73' 87.5 5 W/VFD 10 0 P-6 BOILER RM HEATING WATER CIRC GRUNDFOS UGA BASE MOUNTED 305GPM 87' 85.5 10 W/VFD 10 0 P-7 BOILER RM HEATING WATER CIRC GRUNDFOS UGA BASE MOUNTED 305GPM 87' 85.5 10 W/VFD 10 0 P-8 BOILER RM HEATING WATER CIRC GRUNDFOS UGA BASE MOUNTED 185GPM 73' 87.5 5 W/VFD 10 0 P-9 BOILER RM HEATING WATER CIRC GRUNDFOS UGA BASE MOUNTED 185GPM 73' 87.5 5 W/VFD 10 0 P-10 PENTHOUSE HEATING WATER CIRC GRUNDFOS 2.5LM6 BASE MOUNTED 133GPM 47' 87.5 3 10 0 P-11 PENTHOUSE HEATING WATER CIRC GRUNDFOS 2.5LM6 BASE MOUNTED 133GPM 47' 87.5 3 10 0 P-12 PENTHOUSE HEATING WATER CIRC GRUNDFOS UGA-BBUE BASE MOUNTED 157GPM 59' 81.5 5 10 0 P-13 PENTHOUSE HEATING WATER CIRC GRUNDFOS UGA-BBUE BASE MOUNTED 157GPM 59' 81.5 5 10 0 P-14 FAN ROOM HEATING WATER CIRC GRUNDFOS UGA-BBUE BASE MOUNTED 157GPM 59' 81.5 5 10 0 P-15 FAN ROOM HEATING WATER CIRC GRUNDFOS UGA-BBUE BASE MOUNTED 157GPM 59' 81.5 5 10 0 P-19 BOILER RM DOMESTIC WATER RECIRC GRUNDFOS UP 43-75 BF INLINE - 81.5 1/6 10 0 P-20 BOILER RM DOMESTIC WATER RECIRC GRUNDFOS UP 15-18 SF INLINE - 81.5 1/8 10 0
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE (HP) ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) P-21* POOL EQUIP RM SUMP BELL & GOSSETT 530STK BF BASE MOUNTED - 91 3 10 0 P-22* POOL JANITOR CLOSET POOL DHWR GRUNDFOS UP 25-64SF INLINE - - 1/8 10 0 SF-1 (1977) RM 236 PENTHOUSE CLASSROOM SUPPLY - - - 59000CFM 5.1" NEMA STANDARD 75 W/VFD 25 0 SF-1 (1979) PENTHOUSE CLASSROOM SUPPLY - - - 31000CFM 3.5" NEMA STANDARD 30 W/VFD 25 0 SF-2 (1979) WEIGHT ROOM WEIGHT ROOM/SHOP SUPPLY TRANE CLIMATE CHANGER 8 CENTRIFUGAL 4000CFM 1.25" ≈ 75% 1.5 25 0 SF-2 (1977) RM 236 PENTHOUSE GYMNASIUM SUPPLY BARRY 7490 AF-SI CENTRIFUGAL 25000CFM 1.6" 87.5 10 25 0 SF-3 (1977) RM 236 PENTHOUSE GYMNASIUM/SHOP SUPPLY BARRY 8300FL INLINE 10,000CFM 1.5" 87 7.5 25 0 SF-3 (1979) AREA G FAN ROOM POOL SUPPLY TRANE 31B DRAW THRU 18,000CFM 1.5" 87 10 25 0 SF-4 (1979) AREA G FAN ROOM CLASSROOM SUPPLY TRANE 14 DRAW THRU 7850CFM 3" NEMA STANDARD 10 25 0
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE (HP) ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) SF-5 (1979) AREA G FAN ROOM PERIMETER AIR/HEAT POOL TRANE CLIMATE CHANGER TYPE 3 DRAW THRU 1485CFM 1.5" ≈ 75% 3/4 25 0 SF-6 (1979) AREA H POOL SUPPORT POOL OFFICES/ LOCKERS TRANE SF24A1 CENTRIFUGAL 8800CFM 1.75" NEMA STANDARD 5 25 0 RF-1 PENTHOUSE CLASSROOM RELIEF GREENHECK - CENTRIFUGAL 25,850CFM 0.8" 91.7 7.5 W/VFD 25 0 RF-2 PENTHOUSE CLASSROOM RELIEF GREENHECK - CENTRIFUGAL 25,850CFM 0.8" 91.7 7.5 W/VFD 25 0 RA-1 CORRIDOR POOL RETURN AIR TRANE MOD-Q INLINE 18,000CFM 1.0” - 7.5 25 0 RTU-1 ROOF - MCQUAY RPSO18CSW - - NEMA STANDARD 6.5 20 8 HRU-1 ROOF - INNOVENT E-5000-1 - - NEMA STANDARD 5 15 5 MUA-1 ROOF KITCHEN MAKE-UP GREENHECK DB-112-H20-DBC - 4,000CFM NEMA STANDARD 3 20 10 EF-1 ROOF CLASSROOM TOILET EXHAUST GREENHECK CUBE-240 HP-30-6 ROOF MOUNTED 2500CFM 1.4" NEMA STANDARD 3 25 0 EF-2 ROOF LOCKER ROOM EXHAUST GREENHECK CUBE-121-4-X ROOF MOUNTED 450CFM .75" NEMA STANDARD 1/12 25 0 EF-3 ROOF LAB EXHAUST - - ROOF MOUNTED 3500CFM 1.25" NEMA STANDARD 1.5 25 0 EF-4 ROOF KITCHEN EXHAUST GREENHECK GWEWX-7.75-S ROOF MOUNTED 2000CFM 0.2" NEMA STANDARD 1/4 25 0
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE (HP) ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) EF-5 ROOF POOL EQUIPMENT ROOM EXHAUST GREENHECK CUBE-101-4-X ROOF MOUNTED 400CFM .25" NEMA STANDARD 1/4 15 0 EF-6 ROOF CHLORINE ROOM EXHAUST GREENHECK CUBE-101-4-X ROOF MOUNTED 350CFM .25" NEMA STANDARD 1/4 15 0 EF-7 ROOF GREENHOUSE EXHAUST GREENHECK GB-121-4-X ROOF MOUNTED 500CFM .125" NEMA STANDARD 1/10 15 0 EF-8 ROOF CONCESSION EXHAUST GREENHECK GB-121-4-X ROOF MOUNTED 1400CFM 1.3" NEMA STANDARD 3/4 25 0 EF-9 ROOF KILN HOOD EXHAUST GREENHECK GB-121-4-X ROOF MOUNTED 300CFM .25" NEMA STANDARD 1/4 15 0 EF-10 PENTHOUSE TOILET EXHAUST (KITCHEN AREA) GREENHECK GB-141-5-X ROOF MOUNTED 1000CFM 4.0" NEMA STANDARD 1.5 25 0 EF-11 PENTHOUSE DISHWASHER EXHAUST GREENHECK GB-141-5-X ROOF MOUNTED 750CFM 4.0" NEMA STANDARD 1 25 0 EF-12 ROOF SCIENCE ROOM EXHAUST GREENHECK 63-161-7X ROOF MOUNTED 2500CFM 1.75" NEMA STANDARD 1.5 25 0 EF-17 PENTHOUSE SCIENCE ROOM EXHAUST PENN CENTREX REX 14B INLINE 1700CFM 1.25" NEMA STANDARD 1 25 0 EF-18 PENTHOUSE SCIENCE ROOM EXHAUST PENN CENTREX REX 14B INLINE 1700CFM 1.25" NEMA STANDARD 1 25 0 EF-19 PENTHOUSE SCIENCE ROOM EXHAUST PENN CENTREX REX 14B INLINE 1700CFM 1.25" NEMA STANDARD 1 25 0
Wasilla High School Final Energy Audit Report Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE (HP) ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) EF-20 PENTHOUSE SCIENCE ROOM EXHAUST PENN CENTREX REX 14B INLINE 1700CFM 1.25" NEMA STANDARD 1 25 0 EF-21 PENTHOUSE SCIENCE ROOM EXHAUST - - INLINE 1000CFM 1.25" NEMA STANDARD 3/4 25 0 EF-22 PENTHOUSE SCIENCE ROOM EXHAUST PENN CENTREX REX 14B INLINE 2000CFM 1.25" NEMA STANDARD 1 25 0 EF-23 PENTHOUSE SCIENCE ROOM EXHAUST PENN CENTREX REX 14B INLINE 1600CFM 1.25" NEMA STANDARD 1 25 0 EF-24A-D PENTHOUSE CLASSROOM EXHAUST PENN FB PROPELLER 7250CFM 0.125" 64 1/2 25 0 Notes: * Indicates un-numbered equipment that was found during the site survey.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Appendix D
Energy Conservation Measures
Wasilla High School
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
The following tables consist of raw output data from the AkWarm Commercial program used to model
energy costs and calculate energy savings and financial ratios. These tables represent all of the energy
conservation measures calculated and considered by the energy audit team. However, ECMs included in
the Executive Summary and Section VIII are recommended by the energy audit team due to their viable
financial ratios (SIR>1) or due to their value added.
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
0 a Refrigerators Replace residential & light
commercial
refrigerators/freezers older
than 5 years old
-- -<10
1 Setback
Thermostat:
Classrooms/Offices
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for the
Classrooms/Offices space.
$13,452 $1,000 173.70 0.1
2 Lighting - Controls
Retrofit: Gym
Add new Occupancy Sensor
and Improve Manual
Switching
$14,456 $3,600 58.67 0.2
3 Setback
Thermostat:
Intermittent/Storag
e/Utility
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for the
Intermittent/Storage/Utility
space.
$3,659 $1,000 47.25 0.3
4 Lighting - Controls
Retrofit: Class
Add new Occupancy Sensor
and Improve Manual
Switching
$425 $135 44.53 0.3
5 Lighting - Controls
Retrofit: Class
Add new Occupancy Sensor,
Multi-Level Switch and
Improve Manual Switching
$84 $100 12.29 1.2
6 Lighting - Controls
Retrofit: Library
Add new Occupancy Sensor
and Improve Manual
Switching
$241 $300 11.75 1.2
7 Lighting - Controls
Retrofit: Office
Add new Occupancy Sensor
and Improve Manual
Switching
$80 $100 11.65 1.3
8 Setback
Thermostat:
Multipurpose/Gym-
nasium
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for the
Multipurpose/Gymnasium
space.
$889 $1,000 11.48 1.1
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
9 Lighting - Controls
Retrofit: Class
Add new Occupancy Sensor
and Improve Manual
Switching
$198 $300 9.37 1.5
10 Lighting -
Combined Retrofit:
Class
Replace with 2 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
and Improve Manual
Switching
$187 $325 8.42 1.7
11 Lighting - Controls
Retrofit: Library
Add new Occupancy Sensor $259 $450 8.09 1.7
12 Lighting - Controls
Retrofit: Office
Add new Occupancy Sensor
and Improve Manual
Switching
$54 $100 7.89 1.9
13 Lighting - Controls
Retrofit: Locker
Add new Occupancy Sensor
and Improve Manual
Switching
$191 $400 6.97 2.1
14 Lighting - Controls
Retrofit: Storage
and Custodial
Add new Occupancy Sensor $177 $450 5.76 2.5
15 Lighting - Controls
Retrofit: Class
Add new Occupancy Sensor
and Improve Daylight
Sensor
$88 $240 5.34 2.7
16 Lighting - Controls
Retrofit: Pool
Add new Occupancy Sensor
and Improve Manual
Switching
$72 $200 5.25 2.8
17 Lighting -
Combined Retrofit:
Pool
Replace with 8 FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor
$510 $1,500 4.97 2.9
18 Lighting - Controls
Retrofit: Class
Add new Occupancy Sensor $245 $770 4.64 3.1
19 Lighting - Controls
Retrofit: Class
Add new Occupancy Sensor
and Improve Daylight
Sensor
$111 $355 4.59 3.2
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
20 Lighting -
Combined Retrofit:
Pool
Replace with 4 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
and Improve Manual
Switching
$303 $1,000 4.42 3.3
21 Lighting - Controls
Retrofit: Restrooms
Add new Occupancy Sensor $753 $2,525 4.36 3.4
22 Lighting - Controls
Retrofit: Class
Add new Occupancy Sensor $2,389 $8,030 4.35 3.4
23 Lighting - Controls
Retrofit: Class
Add new Occupancy Sensor $158 $555 4.02 3.5
24 Lighting - Controls
Retrofit: Pool
Add new Occupancy Sensor $562 $2,100 3.91 3.7
25 Lighting -
Combined Retrofit:
Pool
Replace with 5 FLUOR (6)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor
$447 $1,800 3.63 4
26 Lighting - Controls
Retrofit: Class
Add new Occupancy Sensor $95 $390 3.57 4.1
27 Lighting -
Combined Retrofit:
Locker
Replace with FLUOR T8 4'
F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
and Improve Manual
Switching
$50 $250 2.91 5
28 Lighting -
Combined Retrofit:
Pool
Replace with 21 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$670 $3,600 2.72 5.4
29 Lighting - Power
Retrofit: Class
Replace with FLUOR (6) T5
45.2" F54W/T5 HO
Standard (2) StdElectronic
$92 $600 2.24 6.5
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
30 Lighting -
Combined Retrofit:
Class
Replace with 6 FLUOR T5
45.2" F54W/T5 HO
Standard (2) StdElectronic
and Improve Manual
Switching
$546 $3,600 2.22 6.6
31 Lighting - Controls
Retrofit: Office
Add new Occupancy Sensor $31 $220 2.05 7.1
32 Lighting - Controls
Retrofit: Restrooms
Add new Occupancy Sensor $3 $25 1.96 7.5
33 Lighting - Power
Retrofit: Corridor
Replace with 4 FLUOR (3)
T8 4' F32T8 32W Standard
Program StdElectronic
$76 $600 1.86 7.8
34 Lighting -
Combined Retrofit:
Pool High Bay
Replace with 42 FLUOR (6)
T5 45.2" F54W/T5 HO
Standard StdElectronic and
Improve Manual Switching
$3,162 $25,200 1.83 8
35 Lighting - Controls
Retrofit: Library
Add new Occupancy Sensor $18 $150 1.77 8.3
36 Lighting -
Combined Retrofit:
Class
Replace with 2 FLUOR T5
45.2" F54W/T5 HO
Standard StdElectronic and
Improve Manual Switching
$144 $1,200 1.69 8.3
37 Lighting - Controls
Retrofit: Locker
Add new Occupancy Sensor $206 $1,850 1.63 9
38 Ventilation Install CO2 sensors and
Electric to Pneumatic
Transducers to system.
Connect to DDC system.
$9,626 $77,700 1.60 8.1
39 HVAC And DHW Install Pool Cover $1,767 $10,000 1.57 5.7
40 Lighting -
Combined Retrofit:
Class
Replace with 2 FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor
$35 $325 1.52 9.3
41 Lighting - Controls
Retrofit: Office
Add new Occupancy Sensor $42 $400 1.52 9.6
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
42 Lighting - Controls
Retrofit: Office
Add new Occupancy Sensor $146 $1,420 1.50 9.7
43 Lighting - Power
Retrofit:
Auditorium
Replace with FLUOR CFL,
Spiral 20 W
$3 $30 1.45 10.1
44 Lighting - Power
Retrofit: Corridor
Replace with FLUOR (2) T8
4' F32T8 32W Standard
Program StdElectronic
$14 $150 1.36 10.8
45 Lighting - Controls
Retrofit: Office
Add new Occupancy Sensor $215 $2,395 1.31 11.2
46 Lighting - Controls
Retrofit: Library
Add new Occupancy Sensor $12 $150 1.20 12.2
47 Lighting - Controls
Retrofit: Locker
Add new Occupancy Sensor $36 $435 1.16 12.2
48 Lighting -
Combined Retrofit:
Class
Replace with 26 FLUOR (3)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$335 $4,230 1.16 12.6
49 Lighting -
Combined Retrofit:
Office
Replace with 3 FLUOR (3)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$46 $585 1.14 12.9
50 Lighting -
Combined Retrofit:
Class
Replace with 6 FLUOR (3)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$74 $975 1.07 13.2
51 Air Tightening Perform air sealing to reduce
air leakage by 20%.
$6,973 $60,000 1.03 8.6
52 Lighting - Controls
Retrofit: Office
Add new Occupancy Sensor $31 $445 1.01 14.5
53 Lighting -
Combined Retrofit:
Class
Replace with 16 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$173 $2,600 0.97 15
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
54 Lighting -
Combined Retrofit:
Pool
Replace with FLUOR T8 4'
F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$19 $300 0.93 15.8
55 Lighting -
Combined Retrofit:
Locker
Replace with 11 FLUOR T8
4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$119 $1,915 0.91 16.1
56 Lighting - Power
Retrofit: Class
Replace with 132 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$1,136 $19,800 0.84 17.4
57 Lighting -
Combined Retrofit:
Office
Replace with 2 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$22 $390 0.81 18
58 Lighting - Power
Retrofit: Utility
Replace with 9 FLUOR T8
4' F32T8 32W Standard
Program StdElectronic
$8 $150 0.78 18.7
59 Lighting - Controls
Retrofit: Storage
and Custodial
Add new Occupancy Sensor $55 $1,100 0.73 19.9
60 Lighting - Power
Retrofit: Exterior
Lighting Building
Replace with 4 LED 72W
Module StdElectronic
$116 $2,400 0.71 20.7
61 Lighting - Power
Retrofit: Exterior
Lighting Building
Replace with 10 LED 72W
Module StdElectronic
$290 $6,000 0.71 20.7
62 Lighting -
Combined Retrofit:
Class
Replace with 12 FLUOR (6)
T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
and Improve Manual
Switching
$339 $7,200 0.69 21.2
63 Lighting - Power
Retrofit: Exterior
Lighting Building
Replace with 5 LED 50W
Module StdElectronic
$100 $2,500 0.59 25
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
64 Lighting - Power
Retrofit: Exterior
Lighting Building
Replace with LED 50W
Module StdElectronic
$20 $500 0.59 24.9
65 Lighting - Power
Retrofit: Class
Replace with 4 LED 50W
Module StdElectronic
$50 $1,200 0.59 24.2
66 Lighting - Power
Retrofit: Class
Replace with 10 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$57 $1,500 0.55 26.5
67 Lighting - Controls
Retrofit: Storage
and Custodial
Add new Occupancy Sensor $50 $1,485 0.50 29.5
68 Lighting -
Combined Retrofit:
Storage and
Custodial
Replace with 18 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$103 $3,565 0.42 34.7
69 Lighting - Power
Retrofit: Kitchen
Replace with FLUOR (2) T8
4' F32T8 32W Standard
Program StdElectronic
$4 $150 0.38 37.8
70 Lighting - Power
Retrofit:
Auditorium
Replace with FLUOR (2) T8
4' F32T8 32W Standard
Program StdElectronic
$3 $150 0.28 53.3
71 Lighting - Power
Retrofit: Utility
Replace with 30 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$43 $4,500 0.14 105.7
72 Lighting - Power
Retrofit: Utility
Replace with 4 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$4 $600 0.09 162.7
TOTAL $67,147 $283,265 3.12 4.2
a Due to advances in refrigerators in the previous 5 years, new Energy Star refrigerators are much more efficient and result in
viable energy savings.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
ENERGY AUDIT REPORT – ENERGY EFFICIENT RECOMMENDATIONS
1. Building Envelope
Air Leakage
Rank Location Estimated Air Leakage Recommended Air
Leakage Target
Installed
Cost
Annual
Energy
Savings
51 Air Tightness estimated as:
1.30 cfm/ft2 of above-grade
shell area at 75 Pascals
Perform air sealing to
reduce air leakage by
20%.
$60,000 $6,973
2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
39 Install Pool Cover $10,000 $1,767
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
1 Classrooms/Offi
ces
Existing Unoccupied
Heating Setpoint: 70.0 deg
F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Classrooms/Offices
space.
$1,000 $13,452
3 Intermittent/Stor
age/Utility
Existing Unoccupied
Heating Setpoint: 70.0 deg
F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the
Intermittent/Storage/Utilit
y space.
$1,000 $3,659
8 Multipurpose/G
ymnasium
Existing Unoccupied
Heating Setpoint: 70.0 deg
F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the
Multipurpose/Gymnasiu
m space.
$1,000 $889
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Ventilation
Rank Recommendation Cost Annual
Energy
Savings
38 Install CO2 sensors and Electric to Pneumatic Transducers to system.
Connect to DDC system.
$77,700 $9,626
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
2 Gym 48 FLUOR (6) T5 45.2"
F54W/T5 HO Standard
StdElectronic with Manual
Switching
Add new Occupancy
Sensor and Improve
Manual Switching
$3,600 $14,456
4 Class 12 FLUOR (3) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor and Improve
Manual Switching
$135 $425
5 Class FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor, Multi-Level
Switch and Improve
Manual Switching
$100 $84
6 Library 3 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor and Improve
Manual Switching
$300 $241
7 Office FLUOR (3) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor and Improve
Manual Switching
$100 $80
9 Class 3 FLUOR (3) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor and Improve
Manual Switching
$300 $198
10 Class 2 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 2 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
and Improve Manual
Switching
$325 $187
11 Library 63 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$450 $259
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
12 Office FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor and Improve
Manual Switching
$100 $54
13 Locker 4 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor and Improve
Manual Switching
$400 $191
14 Storage and
Custodial
24 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$450 $177
15 Class 19 FLUOR (4) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching, Multi-Level
Switch
Add new Occupancy
Sensor and Improve
Daylight Sensor
$240 $88
16 Pool 2 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor and Improve
Manual Switching
$200 $72
17 Pool 8 FLUOR (4) T12 4'
F40T12 40W Standard (2)
Magnetic with Manual
Switching
Replace with 8 FLUOR
(4) T8 4' F32T8 32W
Standard (2) Program
StdElectronic and Add
new Occupancy Sensor
$1,500 $510
18 Class 53 FLUOR (4) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching, Multi-Level
Switch
Add new Occupancy
Sensor
$770 $245
19 Class 28 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching, Multi-Level
Switch
Add new Occupancy
Sensor and Improve
Daylight Sensor
$355 $111
20 Pool 4 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 4 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
and Improve Manual
Switching
$1,000 $303
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
21 Restrooms 102 FLUOR (2) T8 4'
F32T8 32W Standard
Program StdElectronic with
Manual Switching
Add new Occupancy
Sensor
$2,525 $753
22 Class 636 FLUOR (3) T8 4'
F32T8 32W Standard (2)
Program StdElectronic with
Manual Switching, Multi-
Level Switch
Add new Occupancy
Sensor
$8,030 $2,389
23 Class 44 FLUOR (3) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$555 $158
24 Pool 62 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$2,100 $562
25 Pool 5 FLUOR (6) T12 4'
F40T12 40W Standard (2)
Magnetic with Manual
Switching
Replace with 5 FLUOR
(6) T8 4' F32T8 32W
Standard (2) Program
StdElectronic and Add
new Occupancy Sensor
$1,800 $447
26 Class 31 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$390 $95
27 Locker FLUOR T12 4' F40T12
40W Standard Magnetic
with Manual Switching
Replace with FLUOR T8
4' F32T8 32W Standard
Program StdElectronic
and Add new Occupancy
Sensor and Improve
Manual Switching
$250 $50
28 Pool 21 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 21 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$3,600 $670
29 Class HPS 400 Watt Magnetic
with Manual Switching
Replace with FLUOR (6)
T5 45.2" F54W/T5 HO
Standard (2)
StdElectronic
$600 $92
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
30 Class 6 MH 400 Watt Magnetic
with Manual Switching
Replace with 6 FLUOR
T5 45.2" F54W/T5 HO
Standard (2)
StdElectronic and
Improve Manual
Switching
$3,600 $546
31 Office 5 FLUOR (4) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$220 $31
32 Restrooms FLUOR CFL, Plug-in 26W
Quad Tube StdElectronic
with Manual Switching
Add new Occupancy
Sensor
$25 $3
33 Corridor 4 FLUOR (3) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching, Occupancy
Sensor
Replace with 4 FLUOR
(3) T8 4' F32T8 32W
Standard Program
StdElectronic
$600 $76
34 Pool High Bay 42 MH 400 Watt Magnetic
with Manual Switching
Replace with 42 FLUOR
(6) T5 45.2" F54W/T5
HO Standard
StdElectronic and
Improve Manual
Switching
$25,200 $3,162
35 Library 6 FLUOR (3) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$150 $18
36 Class 2 MH 400 Watt Magnetic
with Manual Switching
Replace with 2 FLUOR
T5 45.2" F54W/T5 HO
Standard StdElectronic
and Improve Manual
Switching
$1,200 $144
37 Locker 77 FLUOR T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$1,850 $206
40 Class 2 FLUOR (4) T12 4'
F40T12 40W Standard (2)
Magnetic with Manual
Switching
Replace with 2 FLUOR
(4) T8 4' F32T8 32W
Standard (2) Program
StdElectronic and Add
new Occupancy Sensor
$325 $35
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
41 Office 9 FLUOR (4) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching, Multi-Level
Switch
Add new Occupancy
Sensor
$400 $42
42 Office 32 FLUOR (3) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$1,420 $146
43 Auditorium INCAN A Lamp, Std 60W
with Manual Switching
Replace with FLUOR
CFL, Spiral 20 W
$30 $3
44 Corridor FLUOR (2) T12 4' F40T12
40W Standard Magnetic
with Manual Switching,
Occupancy Sensor
Replace with FLUOR (2)
T8 4' F32T8 32W
Standard Program
StdElectronic
$150 $14
45 Office 54 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching, Multi-Level
Switch
Add new Occupancy
Sensor
$2,395 $215
46 Library 6 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$150 $12
47 Locker 18 FLUOR CFL, Plug-in
26W Quad Tube
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$435 $36
48 Class 26 FLUOR (3) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching, Multi-Level
Switch
Replace with 26 FLUOR
(3) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$4,230 $335
49 Office 3 FLUOR (3) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 3 FLUOR
(3) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$585 $46
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
50 Class 6 FLUOR (3) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 6 FLUOR
(3) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$975 $74
52 Office 10 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$445 $31
53 Class 16 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 16 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$2,600 $173
54 Pool FLUOR T12 F40T12 40W
U-Tube Standard Magnetic
with Manual Switching
Replace with FLUOR T8
4' F32T8 32W Standard
Program StdElectronic
and Add new Occupancy
Sensor
$300 $19
55 Locker 11 FLUOR T12 4' F40T12
40W Standard Magnetic
with Manual Switching
Replace with 11 FLUOR
T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$1,915 $119
56 Class 132 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 132
FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic
$19,800 $1,136
57 Office 2 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 2 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$390 $22
58 Utility 9 FLUOR T12 4' F40T12
40W Standard Magnetic
with Manual Switching
Replace with 9 FLUOR
T8 4' F32T8 32W
Standard Program
StdElectronic
$150 $8
59 Storage and
Custodial
23 FLUOR (3) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$1,100 $55
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
60 Exterior
Lighting
Building
4 HPS 150 Watt Magnetic
with Manual Switching
Replace with 4 LED 72W
Module StdElectronic
$2,400 $116
61 Exterior
Lighting
Building
10 HPS 150 Watt Magnetic
with Manual Switching
Replace with 10 LED
72W Module
StdElectronic
$6,000 $290
62 Class 12 HPS 400 Watt Magnetic
with Manual Switching
Replace with 12 FLUOR
(6) T5 45.2" F54W/T5
HO Standard (2)
StdElectronic and
Improve Manual
Switching
$7,200 $339
63 Exterior
Lighting
Building
5 HPS 100 Watt Magnetic
with Manual Switching
Replace with 5 LED 50W
Module StdElectronic
$2,500 $100
64 Exterior
Lighting
Building
HPS 100 Watt Magnetic
with Manual Switching
Replace with LED 50W
Module StdElectronic
$500 $20
65 Class 4 HPS 100 Watt Magnetic
with Manual Switching
Replace with 4 LED 50W
Module StdElectronic
$1,200 $50
66 Class 10 FLUOR (2) T12 8'
F96T12 75W Standard
Magnetic with Manual
Switching
Replace with 10 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$1,500 $57
67 Storage and
Custodial
31 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$1,485 $50
68 Storage and
Custodial
18 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 18 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$3,565 $103
69 Kitchen FLUOR (2) T12 4' F40T12
40W Standard
EfficMagnetic with Manual
Switching
Replace with FLUOR (2)
T8 4' F32T8 32W
Standard Program
StdElectronic
$150 $4
70 Auditorium FLUOR (2) T12 4' F40T12
40W Standard Magnetic
with Manual Switching
Replace with FLUOR (2)
T8 4' F32T8 32W
Standard Program
StdElectronic
$150 $3
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
71 Utility 30 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 30 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$4,500 $43
72 Utility 4 FLUOR (2) T12 8'
F96T12 75W Standard
Magnetic with Manual
Switching
Replace with 4 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$600 $4
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Appendix E
Energy Conservation Measures
Wasilla High School Gas Heated Portable Buildings
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
The following tables consist of raw output data from the AkWarm Commercial program used to model
energy costs and calculate energy savings and financial ratios. These tables represent all of the energy
conservation measures calculated and considered by the energy audit team. However, ECMs included in
the Executive Summary and Section VIII are recommended by the energy audit team due to their viable
financial ratios (SIR>1) or due to their value added.
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Setback Thermostat:
Classrooms
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Classrooms space.
$1,874 $7,000 3.37 3.7
2 Lighting: Interior
Lighting
Add new Occupancy
Sensor
$135 $600 3.28 4.5
3 Air Tightening Perform air sealing to
reduce air leakage by 20%.
$336 $2,700 1.09 8
4 Lighting: Interior
Lighting
Replace with 68 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add new
Occupancy Sensor
$767 $11,000 1.02 14.3
5 Lighting: Exterior
Lighting
Replace with 14 LED 35W
Module StdElectronic
$375 $5,600 0.98 14.9
TOTAL $3,486 $26,900 1.68 7.7
ENERGY AUDIT REPORT – ENERGY CONSERVATION RECOMMENDATIONS
2. Building Envelope
Air Leakage
Rank Location Estimated Air Leakage Recommended Air Leakage
Target
Installed
Cost
Annual
Energy
Savings
3 Air Tightness estimated as: 0.66
cfm/ft2 of above-grade shell
area at 75 Pascals
Perform air sealing to
reduce air leakage by 20%.
$2,700 $336
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
2. Mechanical Equipment
Mechanical
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
1 Classrooms Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Classrooms space.
$7,000 $1,874
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
2 Interior Lighting 42 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$600 $135
4 Interior Lighting 68 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 68 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add new
Occupancy Sensor
$11,000 $767
5 Exterior Lighting 14 HPS 70 Watt Magnetic with
Manual Switching
Replace with 14 LED 35W
Module StdElectronic
$5,600 $375
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Appendix F
Energy Conservation Measures
Wasilla High School Electrically Heated Portable Buildings
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
The following tables consist of raw output data from the AkWarm Commercial program used to model
energy costs and calculate energy savings and financial ratios. These tables represent all of the energy
conservation measures calculated and considered by the energy audit team. However, ECMs included in
the Executive Summary and Section VIII are recommended by the energy audit team due to their viable
financial ratios (SIR>1) or due to their value added.
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Setback Thermostat:
Classrooms
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Classrooms space.
$3,983 $10,000 4.68 2.5
2 Lighting: Interior
Lighting
Add new Occupancy
Sensor
$45 $200 3.28 4.5
3 Lighting: Exterior
Lighting
Replace with 10 LED 35W
Module StdElectronic
$345 $4,000 1.26 11.6
4 Air Tightening Perform air sealing to
reduce air leakage by 30%.
$1,479 $12,000 1.04 8.1
5 Lighting: Interior
Lighting
Replace with 68 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add new
Occupancy Sensor
$767 $11,000 1.02 14.3
TOTAL $6,619 $37,200 2.05 5.6
ENERGY AUDIT REPORT – ENERGY CONSERVATION RECOMMENDATIONS
3. Building Envelope
Air Leakage
Rank Location Estimated Air Leakage Recommended Air Leakage
Target
Installed
Cost
Annual
Energy
Savings
4 Air Tightness estimated as: 1.10
cfm/ft2 of above-grade shell
area at 75 Pascals
Perform air sealing to
reduce air leakage by 30%.
$12,000 $1,479
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
2. Mechanical Equipment
Mechanical
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
1 Classrooms Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Classrooms space.
$10,000 $3,983
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
2 Interior Lighting 14 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$200 $45
3 Exterior Lighting 10 HPS 70 Watt Magnetic with
Manual Switching
Replace with 10 LED 35W
Module StdElectronic
$4,000 $345
5 Interior Lighting 68 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 68 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add new
Occupancy Sensor
$11,000 $767
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Appendix G
Site Visit Photos
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
1. Main Entrance, North Facing 2. Front of Building, North Facing
3. Side of Building, West End 4. Side of Building, South Facing
5. Side of Building, South Facing Cont. 6. Cafeteria Walls, South Facing
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
7. South Facing Gym Walls 8. South Facing Gym and Pool Walls
9. Pool Entrance ,East Facing Walls 10. Auto Shop North Facing Walls
11. Boiler Room and Woodshop Walls, North 12. Typical Portable Building
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
13. Boiler B-1and Boiler Controls On Wall 14. Boilers B-1, B-2, & B-3
15. Boiler Circulation Pump PMP-2, Typ. All 16. Water Heater WH-1
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
17. Air Compressors AC-1 and AC-2 18. Hot Water Pumps PMP-4 through PMP-9
19. Typ. VFD Motors for PMP-4 through PMP-9 20. PMP-19 & PMP-20, Domestic Hot Water
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
21. SCF-1, Boiler Room 22. SF-1(1977), Fan Room 236
23. SF-2(1997) Gym Supply Fan, Room 236 24. SF-3(1977) Gym/Shop Supply, Room 236
25. PMP-12, PMP-13, & HX-2 26. VFD Drive to SF-1(1977)
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
27. SF-1(1979), Penthouse 28. Exhaust Fans EF-18-23, Penthouse
29. EF-24A through EF-24D, Penthouse 30. VFD Control SF-1(1979)
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
31. RTU-1, Roof 32. MUA-1
33. SF-3(1979), Area G Fan Room 34. SF-4(1979), Area G Fan Room
35. SF-5(1979), Area G Fan Room 36. SF-6(1979), Pool Fan Room
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
37. EF-12 38. WH-3, WH-4, & WH-5 Pool Supply Room
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Appendix H
Thermographic Photos
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
Coffman Engineers made miscellaneous thermographic images of Wasilla High School using a FLIR
T300 Infrared Camera. This is not a thermographic study, rather photographs to illustrate easy-to-identify
heat losses.
1. Optical Image, North Entry. Thermal Image below is indicated by the white border.
2. Thermographic Image, North Entry. Temperatures indicated by color scale on right. Yellow
indicates heat leakage. The outside temperature was about -14°F.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
3. Optical Image, North Wall. Thermal Image
to the right is indicated by the white border.
4. Thermographic Image, North Wall. Heat loss
occurring around windows, thermal bridging
through building studs, and an uninsulated
wall panel.
5. Optical Image, North Entry Door\. Thermal
Image to the right is indicated by the white
border.
6. Thermographic Image, North Entry Door.
Heat loss occurring around window. Typical.
7. Optical Image, South Kitchen Delivery
Doors. Thermal Image to the right is
indicated by the white border.
8. Thermographic Image, South Kitchen
Delivery Doors. Heat loss occurring through
poorly insulated wall and around man door.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
9. Optical Image, South-facing Classroom
Walls. Thermal Image to the right is
indicated by the white border.
10. Thermographic Image, South-facing
Classroom Walls. Heat loss occurring around
window seals.
11. Optical Image, South Gym Wall. Thermal
Image to the right is indicated by the white
border.
12. Thermographic Image, South Gym Wall.
Heat loss through wall section.
Wasilla High School Final Energy Audit Report
Coffman Engineers, Inc. 6/13/2012 AkWarm No. CIRI-IYS-CAEC-02
13. Optical Image, Typical Portable Building.
Thermal Image to the right is indicated by the
white border.
14. Thermographic Image, Typical Portable
Building. Heat loss around windows and
through floor skirting.
15. Optical Image, Typical Portable. Thermal
Image to the right is indicated by the white
border.
16. Thermographic Image, Portable Building.
Heat loss through 2x4 wall and door.
End of Report