HomeMy WebLinkAboutCIRI-ANC-CAEC Bear Valley Elementary School 2012-EEENERGY AUDIT FINAL REPORT
Bear Valley Elementary School
15001 Mountain Air Drive
Anchorage, AK 99516
p (907) 742*5900
AkWarm ID No. CIRI*ANC*CAEC*09
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
Bear Valley Elementary School Final Energy Audit Report
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Contents
I. Executive Summary .................................................................................................................. 1
II. Introduction .............................................................................................................................. 4
III. Energy Audit Process ............................................................................................................. 5
IV. Method of Analysis ................................................................................................................. 6
V. Building Description ................................................................................................................ 7
V.I SCHOOL ARCHITECTURAL DESCRIPTION .............................................................................................................. 7
V.II MECHANICAL DESCRIPTION ............................................................................................................................... 7
V.III ELECTRICAL DESCRIPTION ................................................................................................................................ 8
V.IV PORTABLE BUILDINGS DESCRIPTION ................................................................................................................ 9
VI. Historic Energy Consumption and Cost............................................................................. 10
VI.I ELECTRICAL CONSUMPTION DATA ................................................................................................................... 10
VI.II NATURAL GAS CONSUMPTION DATA .............................................................................................................. 10
VI.III OVERALL ENERGY CONSUMPTION DATA ....................................................................................................... 10
VII. Equipment Inventory and Photo Survey .......................................................................... 12
VIII. Energy Conservation Measures ....................................................................................... 13
VIII.I SCHOOL ENERGY CONSERVATION MEASURES ............................................................................................... 13
VIII.II PORTABLE BUILDINGS ENERGY CONSERVATION MEASURES ....................................................................... 16
VIII.III ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION ....................................... 17
Appendices
Appendix A – Energy Benchmark Data
Appendix B – AkWarm Commercial Reports
Appendix C – Major Equipment List
Appendix D – Energy Conservation Measures – Bear Valley Elementary School
Appendix E – Energy Conservation Measures – Bear Valley Portable Buildings
Appendix F – Site Survey Photos
Appendix G – Thermographic Photos
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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
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List of Figures
Fig. 1 – Energy Audit Clients ....................................................................................................................... 1
Fig. 2 – Energy Benchmark Data .................................................................................................................. 1
Fig. 3 – Anchorage, Alaska – Google Maps ................................................................................................. 4
Fig. 4 – Bear Valley Elementary School – Google Maps ............................................................................. 4
List of Tables
Table 1. Recommended Energy Conservation Measures, Bear Valley Elementary ..................................... 2
Table 2. Recommended Energy Conservation Measures, Portable Buildings .............................................. 3
Table 3. Energy Cost and Consumption Data ............................................................................................. 10
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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
AkWarmC , the Alaska Retrofit Information System (ARIS), or other state and/or public information systems.
AkWarmC 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.
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I. Executive Summary
This report presents the findings of an energy audit conducted at Bear Valley Elementary School as part
of a contract for:
Alaska Housing Finance Corporation
Contact: Rebekah Luhrs
4300 Boniface Parkway
Anchorage, AK 99510
Email: rluhrs@ahfc.us
Anchorage School District
Contact: Calvin Mundt
1301 Labar Street
Anchorage, AK 99515
Email: mundt_calvin@asdk12.org
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 $50,690
Natural Gas $45,476
Total $96,166
January 2009*December 2010 Energy Utilization Index (EUI) = 118.8 kBtu/sf
January 2009*December 2010 Energy Cost Index = 1.84 $/sf
Fig. 2 – Energy Benchmark Data
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.
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Table 1. Recommended Energy Conservation Measures, Bear Valley Elementary
Executive Summary – Recommended ECMs
Bear Valley Elementary School
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
BVES*1a Refrigerators Replace residential &
light commercial
refrigerators/freezers
older than 5 years old
* * * <10
BVES*2 Lighting Revise wiring to
eliminate nightlights
$275 $700 6.0 2.5
BVES*3 Lighting Replace building
mounted exterior HPS
light fixtures with LED
$1,217 $8,000 2.3 6.6
BVES*4 Lighting Provide bi*level
switching in Gym
$350 $3,500 1.5 10.0
BVES*5 HVAC And
DHW
Stack Economizer
installation and Summer
Boiler Shutdown
$2,103 $29,000 1.7 13.8
BVES*6 Lighting Replace T12 light
fixtures, install occupancy
sensors, replace down
lights
$2,912 $41,850 1.1 14.4
BVES*7 Air
Tightening
Perform air sealing to
reduce air leakage by
15%
$2,846 $25,000 1.0 8.8
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.
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Table 2. Recommended Energy Conservation Measures, Portable Buildings
Executive Summary – Recommended ECMs
Bear Valley Portable Buildings
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
BVPB*1 Setback
Thermostat:
Portable
Building
Implement a Heating
Temperature Unoccupied
Setback for 60.0 deg F for
the Portable Building
Space
$491 $1,000 6.0 2
BVPB*2 Relocatable
Classroom
Lighting
Replace with FLUOR (2)
T8 4' F32T8 32W
Program Start High
Efficiency Electronic
Ballasts and Add new
Occupancy Sensors
$447 per
classroom
$3,450 per
classroom
2.0 7.7
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II. Introduction
This energy audit was conducted at Bear Valley Elementary School for AHFC and the Anchorage School
District. The school is a 52,087 square foot (sf) campus that includes a 50,167 sf school and two on*site
portables that have a combined area of 1,920 sf. 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 – Anchorage, Alaska – Google Maps
Fig. 4 – Bear Valley Elementary School – Google Maps
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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 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, 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 15, 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. Bob Halpin of the ASD Facilities Department1. The
following information was also collected while on site: occupancy schedules, O&M (Operation and
Maintenance) 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. Bob Halpin, (907) 632*2884 (mobile), (907) 348*5212 (office)
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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
shops, 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, version 2.1.3.2, 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.
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V. Building Description
Bear Valley Elementary School is a single*story building with a variety of space usages and schedules. It
was constructed in 1983, and no major building renovations have occurred since then. The facility is
composed of classrooms, a multipurpose room, a gymnasium, a kitchen, a library, and supporting
administrative offices and utility spaces. During the ASD school year, the school is normally occupied
from 6am until 6pm for school and after*school activities, and night janitorial staff works until 12am.
There are several additional buildings on the property. Two portable classrooms, using electric resistance
heat, are normally occupied from 6am to 4pm during the school year. A utility building, housing the well
equipment, is also present on the property.
V.I School Architectural Description
Details of the wall, floor, and roof construction were examined on the architectural drawings and
confirmed during the site visit. Exterior walls are constructed of 2”x6” studs at 16” on centers with R*19
batt insulation and a 2” exterior insulated finish system. Most of the exterior walls are 12’ high, and have
an estimated overall R*Value of R*25.
The school has slab*on*grade floors with 2” of rigid foam insulation covering the slab edge and extending
at least 4’ below grade, providing an estimated R*Value of R*16. There is 48,252 sf of slab on grade floor
area and a total floor area of 50,167 sf. The slab on grade floor area is less than the usable floor area of
the building due to the fan rooms located in mechanical mezzanines.
The sloped roof is constructed of preformed metal roofing over metal decking and is designed to be a cold
roof system. The ceiling structure typically consists of 5/8” gypsum wallboard mounted on studs with 12"
of fiberglass batt insulation, providing an estimated R*Value of R*34. There is approximately 49,748 sf of
roof area. This area is greater than the floor area due to the sloped roof.
Typical window construction for the school consists of double pane, clear glass with a half inch air space
between the panes and an aluminum frame. An estimated insulating value of R*1.6 was given to most of
the windows in the school. Clerestory windows in the school use triple paned windows with aluminum
frames, which have an estimated insulating value of R*2.0. The school’s window area for all windows
facing south (including clerestory windows) is approximately 1,800 sf and all other window areas for the
school total approximately 1,000 sf.
There are two door types in use at Bear Valley. Most doors are half*lite, metal doors with rigid insulation
infill, providing an estimated insulating value of R*2.2. Utility doors are full metal doors with rigid
insulation infill, with an estimated R*Value of R*5.3. There is one overhead door at the school, which is a
metal sectional door with rigid insulation infill. It has an estimated insulating value of R*5.3, and is
approximately 42 sf in area. The rest of the doors total approximately 400 sf in area.
V.II Mechanical Description
The building’s heat is provided by two Weil*McLain series 786 cast iron sectional boilers, each rated for
1,700 thousand BTUs per hour (MBH) natural gas input. Both are equipped with PowerFlame CR2
burners. The heating system medium is water. Conduction and infiltration heating loads are accomplished
with a perimeter baseboard heating system with cabinet unit heaters and horizontal unit heaters, where
required. Ventilation heating is provided by heating coils using glycol, which is heated by the central
heating system using water*to*glycol heat exchangers located in each fan room. No mechanical cooling is
provided for any systems in the facility.
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There are five air handling units (AHUs) serving Bear Valley Elementary School. All air handling units
are original construction Trane Climate Changer series appropriately sized for their different applications.
AHU*1 is a variable air volume unit equipped with a 30 horsepower (HP) VFD*equipped motor and
serving up to 21,000 cubic feet per minute (CFM) of air. It serves the west wing classrooms and the main
office. AHU*2 and AHU*4 are constant volume units equipped with 5 HP motors. AHU*2 serves the
gymnasium and parts of the music room and music office with 7,575 CFM. AHU*4 serves the
multipurpose room and parts of the music room and music offices with 5,503 CFM. AHU*5 is a constant
volume makeup air handling unit serving the kitchen which operates when the range hood exhaust fan,
EF*7, is operating. The unit is equipped with a 1/4 HP motor and serves 1,100 CFM when operating.
AHU*5 and EF*7 are rarely used since no food preparation occurs at Bear Valley, only food warm*up.
A gas*fired water heater, a PVI Nickelshield Maxim series, provides domestic hot water for the school. It
is rated for 270 MBH natural gas input and has a 125 gallon storage tank. The system is engineered for
hot water recirculation, using a Grundfos type UP 25*64SF pump.
Building domestic cold water is provided by a well system, which primarily fills a 10,000 gallon tank
located in a utility outbuilding. From the utility outbuilding, water is pumped to a domestic cold water
daytank, which provides pressurization control for the domestic cold water system.
The school’s building energy management and control system is controlled using a hybrid electro*
pneumatic system. The direct digital control (DDC) control system sends system commands to
electropneumatic transducers, which operate the various equipment to provide the desired control. The
system has been adequately maintained and appeared to be in working order during the site visit.
Pneumatic systems, even hybrid systems such as the one in use, are considered outdated due to the vast
improvements in monitoring, control and operating efficiencies available from the modern genre of
electronic control systems. The energy management and control system controls the boilers, heating water
pumps, and supply fans.
V.III Electrical Description
Bear Valley Elementary School is served by a 1400A, 208V, 3*phase, 4*wire, underground service. The
electric utility is Chugach Electric Association. The school also has a standby, reciprocating diesel
generator.
Most classrooms and corridors are illuminated by light fixtures equipped with two or three 32 watt (W) T*
8 fluorescent lamps and electronic ballasts. Corridor lighting is controlled by a central contactor,
connected to the security system. Classroom lighting is typically controlled by wall switches. The Gym is
illuminated with six lamp T5HO light fixtures controlled by occupancy sensors. Most offices, storage
areas, utility rooms, the Art classroom are illuminated by T12 fixtures with magnetic ballasts. Lighting
levels throughout the school are typically consistent with current Illumination Engineering Society of
North America (IESNA) illumination standards.
Exterior lighting is provided by high pressure sodium (HPS) sources. There are (13) 400W HPS pole
mounted "shoebox" type area lighters illuminating the parking lot and driveway. There are (7) 150W HPS
smaller pole mounted area lighters illuminating the walkways. There are (6) 400W HPS pole mounted
flood lights illuminating the skating rink. There are (10) 150W HPS canopy lights over the entrances and
around the perimeter of the building. There are (5) 100W HPS canopy lights over the entrances and
around the perimeter of the building. All exterior lighting is controlled by contactors located in the main
electrical room base on signals from a central photocell and the security system. Parking lot lights are
shut*off when the security system is armed.
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Other electricity*using equipment not previously described in the mechanical or electrical sections include
a commercial reach*in freezer, a commercial reach*in refrigerator, a microwave and other kitchen
equipment, and various user equipment such as projectors, computers, printers, and a laminator (which is
turned off when not in use).
V.IV Portable Buildings Description
There are two 960 sf portable classrooms in use at Bear Valley Elementary School. They are both of
similar construction and were both built in 1981. Wall construction consists of T1*11 siding over 2” x 4”
walls with R*11 batt insulation. The portables rest on sleepers with T1*11 skirting around the perimeter.
Floor construction is estimated to be 2” x 8” joists with R*19 batt insulation. Each portable is designed
with a cold roof system, with shingles and plywood over 2” x 8” joists with an estimated R*19 batt
insulation infill.
Each portable has two insulated metal doors. The windows of each portable are double pane with
aluminum frames. The heating is provided by electric resistance baseboards with a manual thermostat on
each unit.
The interior lighting of each portable consists of approximately (17), 4', surface*mounted wrap fixtures
with (2) 40W T12 lamps and magnetic ballasts. There is also (1) 2'X2' fixture with (2) 34W T12 lamps
and a magnetic ballast.
The portable buildings were modeled in a separate AkWarm file than the main elementary school, and
since the portables are similar in all respects, only one model was created. Detailed information is
provided in Appendix E.
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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. The Chugach Electric
Association provides the electricity and Enstar Natural Gas Company provides 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 natural
gas 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 1,000W load operating for one hour will use 1
kWh of electricity as would ten, 100W 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 supplier bills for consumption in units of 100 cubic feet (CCF) of natural gas. Natural gas
is delivered as needed through a utility service connection. The average heating value of natural gas is
100,000 BTUs per CCF, which is equal to 1 Therm of energy.
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 natural gas utility data provided, the average cost for the energy and consumption calculations
at the surveyed facility are summarized in the table below.
Table 3. Energy Cost and Consumption Data
Energy Cost and Consumption Data
2009 2010 Average
Electric 0.14 $/kWh 0.12 $/kWh 0.13 $/kWh
Natural Gas 1.01 $/CCF 0.87 $/CCF 0.94 $/CCF
Total Cost $107,224 $85,107 $96,166
ECI 2.06 $/sf 1.63 $/sf 1.85 $/sf
Electric EUI 27.3 kBtu/sf 25.0 kBtu/sf 26.2 kBtu/sf
Natural Gas EUI 95.8 kBtu/sf 89.8 kBtu/sf 92.8 kBtu/sf
Building EUI 123.1 kBtu/sf 114.8 kBtu/sf 119.0 kBtu/sf
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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 52,087 square feet. This area includes the
main building in addition to the two portable buildings and utility building.
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.
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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 F. Thermographic photos of specific building envelope features
were also taken during the site visit. See Appendix G for thermographic photos.
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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# BVES;1 – Replace residential & light commercial refrigerators/freezers older than 5 years
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 #BVES–2 Revise Wiring to Eliminate Night Lights
Annual Energy Savings Installed Cost SIR Payback (years)
$275 $700 6.0 2.5
There are approximately ten unswitched light fixtures (nightlights) in the administrative areas and small
classrooms. These are three*lamp fixtures with one unswitched lamp. This measure would rewire these
fixtures to be switched. If ECM #BVES*6 is implemented, occupancy sensors will be installed in all the
affected areas, making the night lights redundant.
There is one four*foot, three*lamp, T12 light fixture mounted to the wall in the gym. One lamp is an
unswitched nightlight, the other lamps are manually switched. This measure would replace the fixture
with a battery backed up "bug*eye" type emergency lighting unit. This measure is modeled as items 1, 2,
3, & 10. See appendix D for more information.
ECM # BVES;3 – Upgrade Building Mounted Exterior Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$1,217 $8,000 2.3 6.6
The building mounted exterior HPS lighting at the school consists of ten 250W HPS recessed canopy
fixtures and five 100W wallpacks. This ECM would replace the 250W HPS fixtures with 100W LED
fixtures and the 100W fixtures with 40W LED. It assumes the reuse of existing wiring. This measure is
modeled as items 7 &11. See appendix D for more information. Calculations were also run on the
replacement of pole mounted parking lot lighting with LED fixtures. The results did not support their
replacement for two reasons: the labor costs are greater when working at those heights and the interface
with the security system that shuts off parking lot lighting already saves a substantial amount of energy.
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ECM# BVES;4 ; Provide Bi;level switching in Gym
Annual Energy Savings Installed Cost SIR Payback (years)
$350 $3,500 1.54 10.0
The gym room is illuminated by high*bay fluorescent fixtures equipped with six 54W T5HO fluorescent
lamps and electronic ballasts. The gym lighting is controlled by wall*mount occupancy sensors. This
measure would rewire the gym lighting to provide 3*level switching. This would allow the users to select
appropriate lighting levels for different tasks. The occupancy sensors would be configured to turn the
lights on at the lowest level when motion is sensed. The higher levels would be controlled by keyed
switches. This measure is modeled as item 13. See appendix D for more information.
ECM #BVES;5 – Install Exhaust Stack Economizer & Summer Boiler Shutdown
Annual Energy Savings Installed Cost SIR Payback (years)
$2,090 $29,000 1.16 13.9
Installing one exhaust stack economizer on the combined exhaust stack of the two existing gas*fired
boilers will recover heat from exhaust gases. An exhaust stack economizer utilizes a fan and heat
exchanger to transfer heat from exhaust gases to the hydronic system, increasing the efficiency of the
heating system by approximately 5% or more. Additionally, the boilers currently run year*round, even
during the summer when the building is unoccupied. The heating system does not use grooved
mechanical fittings, so a summer shutdown can be used without causing leaks or joint failure. Since
domestic hot water is provided by a gas*fired water heater, and not dependent on the boilers, summer
shutdown can be programmed. The savings of both a stack economizer and a summer shutdown are
included in this measure. See item 18 in Appendix D for more details.
ECM# BVES;6 ; Replace T12 light fixtures, install occupancy sensors, replace down lights
Annual Energy Savings Installed Cost SIR Payback (years)
$2,912 $41,850 1.1 14.4
This measure would replace all remaining T12 light fixtures in the school with more efficient sources;
install occupancy sensors in all classrooms, offices, and storage spaces; and replace CFL down lights with
LED fixtures.
The previous energy conservation projects executed at this school upgraded T12 light fixtures in corridors
and most classrooms to T8 sources. Elimination of all T12 lamps will simplify maintenance. This
measure would replace the remaining T12 light fixtures in the art classroom, library, offices, smaller
classrooms, storage spaces, and utility spaces. This measure would replace the following fixtures: (5) 3*
lamp, T12 fixtures in hallways that the currently over*illuminated with (5) 2*lamp T8 fixtures; (7) 3*lamp,
T12 fixtures in small classrooms that the currently over*illuminated with (7) 2*lamp T8 fixtures; (11) 2*
lamp, T12 fixtures in restrooms with (11) 2*lamp T8 fixtures; (2) 3*lamp, T12 fixtures in offices that the
currently over*illuminated with (2) 2*lamp T8 fixtures; (29) 2*lamp, T12 fixtures in offices with (29) 2*
lamp T8 fixtures; (42) 2*lamp, T12 fixtures in storage and utility spaces with (29) 2*lamp T8 fixtures; (8)
1*lamp, T12 fixtures in storage and utility spaces with (8) 1*lamp T8 fixtures; (12) 2*lamp, 2'X2' T12
fixtures in elementary classroom restrooms with (12) 2*lamp, 2'X2' T8 fixtures; (27) 2*lamp, T12
suspended direct/indirect fixtures in art classroom with (8) 3*lamp T5HO suspended direct/indirect
fixtures; (28) 2*lamp, T12 suspended direct/indirect fixtures in library with (14) 3*lamp T5HO suspended
direct/indirect fixtures; and (4) 2*lamp T12 fixtures in art classroom storage areas with (4) 2*lamp, 2'X2'
T8 fixtures.
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This measure would also upgrade (19) CFL downlights in corridors and (5) CFL downlights in the library
with LED retrofit kits. This measure would relamp two incandescent fixtures in storage spaces with a*
base LED lamps. Elimination of all CFL and incandescent lamps will simplify maintenance.
Currently, there are very few occupancy sensors in use at this school. This measure includes installing
approximately 77 wall or ceiling mounted occupancy sensors in offices, the workroom, small classrooms,
resource rooms, storage areas, utility spaces, the art classroom, the library, and restrooms. The sensors
will automatically shut off the lights in the room when no one is present. This measure is modeled as
items 5, 6, 8, 9, 12, 15, 16, 17, 19, 20, 21, 23, 24, 25, 27, 28, 29, & 33. See appendix D for more
information.
ECM # BVES;10 – Perform Air Sealing to Reduce Air Leakage by 15%
Annual Energy Savings Installed Cost SIR Payback (years)
$2,842 $25,000 1.02 8.8
Unconditioned infiltration air, leaking through doors, windows, and other building envelope penetrations
contributes to the heating required in the building. Reducing air infiltration by 15% will result in
significant heating costs savings. 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. In high
wind areas such as Bear Valley Elementary School, windbreak panels can be installed over existing
mechanical louvers to reduce wind*driven infiltration while still allowing adequate outside air inflow. To
achieve viable economic benefit, up to $25,000 can be invested and still achieve an SIR ≥ 1 by reducing
air leakage by 15%. See item 22 in Appendix D for more information.
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VIII.II Portable Buildings Energy Conservation Measures
These measures are calculated per portable building. Both portables are of similar construction in all
respects, allowing the energy audit team to model one portable and carryover its energy usage and ECMs
to both buildings. Since there are two portables at Bear Valley, each ECM’s metrics should be multiplied
by two if both portables are to receive upgrades.
ECM #BVPB;1 – Setback Thermostat
Annual Energy Savings Installed Cost SIR Payback (years)
$491 $1,000 6.03 2
Significant energy savings exist by reducing the room temperature of the portable building during
unoccupied times. However, due to the fact that the portable building has perimeter electric baseboard
heaters, each with individual dial thermostats, it is difficult to obtain a desired set point in the portable
building. As a result, the temperature in the portable is typically much higher than required, 65F or
warmer. Also, the temperature cannot be set back during unoccupied times. It is recommended that a
central programmable thermostat be installed in the portable building that can turn the perimeter electric
baseboards on or off to control occupied and unoccupied temperature set points. Reducing the portable
temperature from 65F to 60F during unoccupied times will save $491 annually per portable in electricity
bills. See item 1 in Appendix E for more information.
ECM # BVPB;2 –Upgrade Lighting in Relocatable Classrooms
Annual Energy Savings Installed Cost SIR Payback (years)
$738 per classroom $3,400 per
classroom
3.23 4.7
The interior lighting of both portable classrooms consists of approximately (17), 4', surface*mounted wrap
fixtures with (2) 40W T12 lamps and magnetic ballasts. There is also (1) 2’X2’ fixture with (2) 34W T12
lamps and a magnetic ballast.
This measure consists of replacing the all interior lighting with (2) lamp T8 fixtures with high efficiency
electronic ballasts, bi*level switching, and occupancy sensor control. The costs and savings noted are for
upgrading one relocatable classroom.
This ECM is a compilation of items 2 and 3 as modeled in AkWarm which are intended to be
implemented concurrently. Details of individual items are shown in Appendix E.
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VIII.III 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.
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Appendix A
Energy Benchmark Data
First Name Last Name Middle Name Phone
Steven Golab 348-5132
State Zip
AK
Monday-
Friday
Saturday Sunday Holidays
8-4:30
Average # of
Occupants
During
513
Renovations
Date
99517
Email
Golab_Steven@asdk12.org
Details
15001 Mountain Air Dr
City
Anchorage
Mailing Address
Facility Zip
261,500
REAL Preliminary Benchmark Data Form
PART I – FACILITY INFORMATION
Facility Owner
MOA
Anchorage
Primary
Operating
Hours
Contact Person
Building Name/ Identifier Building Usage Building Square Footage
Facility Owned By Date
07/22/11Municipal Government/Subdivision
Bear Valley Elementary Education - K - 12 52,087
Facility Address
Building Type
Mixed
Community Population
Facility City
Year Built
1984
PART II – ENERGY SOURCES
Heating Oil Electricity Natural Gas Propane Wood Coal
$ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton
Other energy
sources?
Describe
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.
Bear Valley Elementary
Buiding Size Input (sf) =52,087
2009 Natural Gas Consumption (Therms)49,888.00
2009 Natural Gas Cost ($)50,311
2009 Electric Consumption (kWh)416,843
2009 Electric Cost ($)56,913
2009 Total Energy Use (kBtu)6,411,485
2009 Total Energy Cost ($)107,224
Annual Energy Use Intensity (EUI)
2009 Natural Gas (kBtu/sf) 95.8
2009 Electricity (kBtu/sf)27.3
2009 Energy Utilization Index (kBtu/sf)123.1
Annual Energy Cost Index (ECI)
2009 Natural Gas Cost Index ($/sf)0.97
2009 Electric Cost Index ($/sf)1.09
2009 Energy Cost Index ($/sf)2.06
2010 Natural Gas Consumption (Therms)46,789.00
2010 Natural Gas Cost ($)40,640
2010 Electric Consumption (kWh)381,1972010 Electric Consumption (kWh)381,197
2010 Electric Cost ($)44,467
2010 Total Energy Use (kBtu)5,979,925
2010 Total Energy Cost ($)85,107
Annual Energy Use Intensity (EUI)
2010 Natural Gas (kBtu/sf)89.8
2010 Electricity (kBtu/sf)25.0
2010 Energy Utilization Index (kBtu/sf)114.8
Annual Energy Cost Index (ECI)
2010 Natural Gas Cost Index ($/sf)0.78
2010 Electric Cost Index ($/sf)0.85
20010 Energy Cost Index ($/sf)1.63
Note:
1 kWh = 3,413 Btu's
1 Therm = 100,000 Btu's
1 CF ≈ 1,000 Btu's
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Bear Valley ElementaryNatural GasBtus/CCF =100,000Provider Meter # Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)Enstar NGC105665 Jan-09 12/17/08 01/22/09368,0678,067$8,144$1.01Enstar NGC105665 Feb-09 01/22/09 02/20/09296,0136,013$6,086$1.01Enstar NGC105665 Mar-09 02/20/09 03/25/09335,7085,708$5,783$1.01Enstar NGC105665 Apr-09 03/25/09 04/23/09293,9033,903$3,979$1.02Enstar NGC105665 May-09 04/23/09 05/20/09272,5422,542$2,616$1.03Enstar NGC105665 Jun-09 05/20/09 06/23/09341,9581,958$2,020$1.03Enstar NGC105665 Jul-09 06/23/09 07/24/09311,5751,575$1,645$1.04Enstar NGC105665 Aug-09 07/24/09 08/21/09281,9531,953$2,026$1.04Enstar NGC105665 Sep-09 08/21/09 09/23/09332,2892,289$2,357$1.03Enstar NGC105665 Oct-09 09/23/09 10/22/09293,9903,990$4,072$1.02Enstar NGC105665 Nov-09 10/22/09 11/19/09285,7895,789$5,876$1.02Enstar NGC105665 Dec-09 11/19/09 12/17/09286,1016,101$5,707$0.94Enstar NGC105665 Jan-10 12/17/09 01/20/10345,8765,876$4,922$0.84Enstar NGC105665 Feb-10 01/20/10 02/19/10305,0055,005$4,202$0.84Enstar NGC105665 Mar-10 02/19/10 03/19/10284,9394,939$4,166$0.84Enstar NGC105665 Apr-10 03/19/10 04/21/10333,7413,741$3,187$0.85Enstar NGC105665 May-10 04/21/10 05/20/10292,7922,792$2,400$0.86Enstar NGC105665Jun-1005/20/1006/22/10331,9741,974$1,712$0.87Enstar NGC105665Jun-1005/20/1006/22/10331,9741,974$1,712$0.87Enstar NGC105665 Jul-10 06/22/10 07/21/10291,8021,802$1,637$0.91Enstar NGC105665 Aug-10 07/21/10 08/24/10341,9931,993$1,934$0.97Enstar NGC105665 Sep-10 08/24/10 09/23/10302,3122,312$2,220$0.96Enstar NGC105665 Oct-10 09/23/10 10/20/10273,9203,920$3,541$0.90Enstar NGC105665 Nov-10 10/20/10 11/18/10295,1935,193$4,533$0.87Enstar NGC105665 Dec-10 11/18/10 12/16/10287,2427,242$6,186$0.85Jan - 09 to Dec - 09 total:49,88849,8880.00$50,311$0Jan - 10 to Dec - 10 total:46,78946,7890.00$40,640$0$1.01$0.87Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
$3,000 $4,000 $5,000 $6,000 $7,000 $8,000 $9,000 3,0004,0005,0006,0007,0008,0009,000Natural Gas Cost ($)Natural Gas Consumption (Therms)Bear Valley Elem. - Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)Natural Gas Consumption (Therms)Natural Gas Cost ($)$0 $1,000 $2,000 01,0002,000Jan-09 Mar-09 May-09 Jul-09 Sep-09 Nov-09 Jan-10 Mar-10 May-10 Jul-10 Sep-10 Nov-10Natural Gas Consumption (Therms)Date (Mon - Yr)Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Bear Valley ElementaryElectricityBtus/kWh =3,413Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)CEA 4-22537978 Dec-08 11/30/2008 12/29/20082942,4901,450136 $6,622$0.160CEA 4-22537978 Jan-09 12/29/2008 1/29/20093140,6001,386136 $6,172$0.150CEA 4-22537978 Feb-09 1/29/2009 3/2/20093238,5801,317136 $5,901$0.150CEA 4-22537978 Mar-09 3/2/2009 3/31/20092940,8001,393141 $6,027$0.150CEA 4-22537978 Apr-09 3/31/2009 4/30/20093035,6851,218141 $5,564$0.160CEA 4-22537978 May-09 4/30/2009 5/29/20092914,47549462 $2,027$0.140CEA 4-22537978 Jun-09 5/29/2009 6/30/20093215,114516133 $2,033$0.130CEA 4-22537978 Jul-09 6/30/2009 7/30/20093030,3331,035138 $4,394$0.140CEA 4-22537978 Aug-09 7/30/2009 8/28/20092936,1131,233138 $4,612$0.130CEA 4-22537978 Sep-09 8/28/2009 9/29/20093238,7051,321130 $3,733$0.100CEA 4-22537978 Oct-09 9/29/2009 10/29/20093041,1751,405130 $4,995$0.120CEA 4-22537978 Nov-09 10/29/2009 11/30/20093242,7731,460129 $4,833$0.110CEA 4-22537978 Dec-09 11/30/2009 12/29/20092940,6971,389130 $4,637$0.110CEA 4-22537978 Jan-10 12/29/2009 1/28/20103038,3601,309130 $4,239$0.110CEA 4-22537978 Feb-10 1/28/2010 3/1/20103235,3701,207130 $4,280$0.120CEA 4-22537978 Mar-10 3/1/2010 3/31/20103037,2001,270125 $4,324$0.120CEA 4-22537978 Apr-10 3/31/2010 4/30/20103031,7751,084125 $3,990$0.130CEA4-22537978May-104/30/20105/31/20103114,785505125$1,653$0.110CEA4-22537978May-104/30/20105/31/20103114,785505125$1,653$0.110CEA 4-22537978 Jun-10 6/1/2010 6/30/20102912,755435122 $1,563$0.120CEA 4-22537978 Jul-10 7/1/2010 7/30/201139423,405799123 $3,173$0.140CEA 4-22537978 Aug-10 7/30/2010 8/30/20103134,6401,182123 $4,086$0.120CEA 4-22537978 Sep-10 8/31/2010 9/30/20103033,4801,143116 $3,842$0.110CEA 4-22537978 Oct-10 10/1/2010 11/4/20103438,5871,317116 $4,261$0.110CEA 4-22537978 Nov-10 11/5/2010 12/5/20103040,1431,370122 $4,419$0.110416,84314,2271,550$56,9130381,19713,0101,487$44,4670$0.14$0.12Dec - 08 to Nov - 09 total:Dec - 09 to Nov - 10 total:Dec - 08 to Nov - 09 avg:Dec - 09 to Nov - 10 avg:Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
$3,000$4,000$5,000$6,000$7,00015,00020,00025,00030,00035,00040,00045,000Electric Cost ($)Electric Consumption (kWh)Bear Valley Elem. - Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)$0$1,000$2,00005,00010,00015,000Dec-08Feb-09Apr-09Jun-09Aug-09Oct-09Dec-09Feb-10Apr-10Jun-10Aug-10Oct-10Date (Mon - Yr)Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Bear Valley Elementary School Final Energy Audit Report
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Appendix B
AkWarm Commercial Reports
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Elementary School
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 6/12/2012 10:00
AM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Bear Valley ES Auditor Company: Coffman Engineers, Inc.
Address: 15001 Mountain Air Drive Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Anchorage Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Calvin Mundt
Client Address: 1301 Labar Street
Anchorage, AK 99515
Auditor Phone: (907) 276*6664
Auditor FAX: (907) 276*5042
Client Phone: (907) 742*5213 Auditor Comment:
Client FAX:
Design Data
Building Area: 50,167 square feet Design Heating Load: Design Loss at Space: 1,763,409
Btu/hour
with Distribution Losses: 1,852,353 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency and
25% Safety Margin: 2,823,710 Btu/hour
Note: Additional Capacity should be added for DHW load,
if served.
Typical Occupancy: 500 people Design Indoor Temperature: 72 deg F (building
average)
Actual City: Anchorage Design Outdoor Temperature: *18 deg F
Weather/Fuel City: Anchorage Heating Degree Days: 10,816 deg F*days
Utility Information
Electric Utility: Chugach Electric * Commercial *
Sm
Natural Gas Provider: Enstar Natural Gas * Commercial
* Sm
Average Annual Cost/kWh: $0.130/kWh Average Annual Cost/ccf: $0.940/ccf
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 Elementary School 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 $36,935 $0 $3,098 $20,270 $0 $22,498 $0 $0 $9,925 $0 $92,726 With Proposed Retrofits $32,868 $0 $3,098 $14,685 $0 $20,223 $0 $0 $9,925 $0 $80,800 SAVINGS $4,067 $0 $0 $5,584 $0 $2,275 $0 $0 $0 $0 $11,926
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 Elementary School
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 Elementary School
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 Elementary School
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 Elementary School Annual Modeled Consumption (Blue) compared to Actual Electric (Left) and Natural Gas (Right) Consumption (Orange).
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 Elementary School Monthly Modeled Consumption (Blue) compared to Actual Electric Consumption (Orange).
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 Elementary School Monthly Modeled Consumption (Blue compared to Actual Natural Gas Consumption (Orange).
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Portable Buildings
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 6/12/2012 10:06 AM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Bear Valley ES * Portable Building Auditor Company: Coffman Engineers, Inc.
Address: 15001 Mountain Air Drive Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Anchorage Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Calvin Mundt
Client Address: 1301 Labar Street
Anchorage, AK 99515
Auditor Phone: (907) 276*6664
Auditor FAX: (907) 276*5042
Client Phone: (907) 742*5213 Auditor Comment:
Client FAX:
Design Data
Building Area: 960 square feet Design Heating Load: Design Loss at Space: 12,455
Btu/hour
with Distribution Losses: 12,455 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency and
25% Safety Margin: 18,987 Btu/hour
Note: Additional Capacity should be added for DHW load,
if served.
Typical Occupancy: 25 people Design Indoor Temperature: 70 deg F (building average)
Actual City: Anchorage Design Outdoor Temperature: *18 deg F
Weather/Fuel City: Anchorage Heating Degree Days: 10,816 deg F*days
Utility Information
Electric Utility: Chugach Electric * Commercial *
Sm
Natural Gas Provider: Enstar Natural Gas * Commercial *
Sm
Average Annual Cost/kWh: $0.130/kWh Average Annual Cost/ccf: $0.000/ccf
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 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 $2,283 $0 $0 $615 $0 $309 $0 $0 $0 $0 $3,207 With Proposed Retrofits $1,674 $0 $0 $168 $0 $309 $0 $0 $0 $0 $2,151 SAVINGS $609 $0 $0 $447 $0 $0 $0 $0 $0 $0 $1,056
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 Portable Buildings
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 $0$500$1,000$1,500$2,000$2,500$3,000$3,500Existing RetrofitElectricityAnnual Energy Costs by Fuel
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Appendix C
Major Equipment List
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) B*1 BOILER RM BUILDING HEATING WEIL MCLAIN 786 CAST IRON NAT. GAS 1701 MBH 82% 30 ≈ 1 B*2 BOILER RM BUILDING HEATING WEIL MCLAIN 786 CAST IRON NAT. GAS 1701 MBH 82% 30 ≈ 1 WH*1 BOILER RM DOMESTIC WATER HEATING PVI MAXIM GAS FIRED WATER HEATER 270 MBH 84% 21 0 CP*1 BOILER RM HEATING WATER CIRC BELL & GOSSETT 1510 BASE MOUNT 130 GPM 80’ ≈85% 7.5 20 0 CP*2 BOILER RM HEATING WATER CIRC BELL & GOSSETT 1510 BASE MOUNT 130GPM 80' ≈85% 7.5 20 0 CP*3 BOILER RM EAST FAN RM BELL & GOSSETT 60 INLINE 53GPM NEMA STANDARD 2 10 0 CP*4 BOILER RM WEST FAN RM BELL & GOSSETT 60 INLINE 56GPM NEMA STANDARD 2 10 0 CP*5 BOILER RM UTILITY BLDG BELL & GOSSETT 60 INLINE NEMA STANDARD 1/2 10 0 AHU*1 WEST FAN RM WEST CLASSROOMS TRANE CLIMATE CHANGER 31 CENTRIFUGAL VAV 21000 CFM 3.7" ≈ 75% 30 25 0 AHU*2 WEST FAN RM GYMNASIUM TRANE CLIMATE CHANGER 12 CENTRIFUGAL CONSTANT VOLUME 7575 CFM 2" ≈ 75% 5 25 0 AHU*3 EAST FAN RM EAST CLASSROOMS TRANE CLIMATE CHANGER 31 CENTRIFUGAL VAV 14700 CFM 3.7" ≈ 75% 20 25 0
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) AHU*4 EAST FAN RM MPR TRANE CLIMATE CHANGER 12 CENTRIFUGAL CONSTANT VOLUME 5503 CFM 2" ≈ 75% 5 25 0 AHU*5 EAST FAN RM KITCHEN MAKE*UP TRANE CLIMATE CHANGER 3 CENTRIFUGALMAKE UP AIR 1100CFM 0.5" ≈ 75% 1/4 25 0 EF*1 WEST FAN RM RESTROOMS TRANE * CENTRIFUGAL BELT DRIVE 740 CFM 1" NEMA STANDARD 1/3 25 0 EF*2 WEST FAN RM GREENHOUSE TRANE * CENTRIFUGAL BELT DRIVE 400 CFM 0.5" NEMA STANDARD 1/6 25 0 EF*3 EAST FAN RM DARKROOM TRANE * CENTRIFUGAL DIRECT DRIVE 150 CFM 0.375" NEMA STANDARD 105 W 25 0 EF*4 EAST FAN RM GYM SHOWER TRANE * CENTRIFUGAL DIRECT DRIVE 80 CFM 0.375" NEMA STANDARD 105 W 25 0 EF*5 ART ROOM KILN TRANE * CENTRIFUGAL DIRECT DRIVE 500 CFM 0.5" NEMA STANDARD 280 W 25 0 EF*6 JANITOR RM JANITOR TRANE * CENTRIFUGAL DIRECT DRIVE 250 CFM 0.25" NEMA STANDARD 130 W 25 0 EF*7 KITCHEN RANGE HOOD TRANE * CENTRIFUGAL BELT DRIVE 2000 CFM 1.5" NEMA STANDARD 2 25 0 EF*8 EAST FAN RM RESTROOMS TRANE * CENTRIFUGAL BELT DRIVE 1180 CFM 0.9” NEMA STANDARD 1/3 25 0 EF*9 WEST FAN RM JANITOR TRANE * CENTRIFUGAL DIRECT DRIVE 80 CFM 0.5” NEMA STANDARD 130 W 25 0
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Appendix D
Energy Conservation Measures
Bear Valley Elementary School
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
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 Lighting * Controls
Retrofit: Gym NL
Improve Manual Switching $49 $1 755.75 0
2 Lighting * Controls
Retrofit: Classroom NL
Improve Manual Switching $42 $100 6.36 2.4
3 Lighting * Controls
Retrofit: Office NL
Improve Manual Switching $147 $350 6.36 2.4
4 Other Electrical *
Power Retrofit:
Portable
Replace with 2
Representative load for
Portable Consumption Load
$1,558 $6,900 3.42 4.4
5 Lighting * Controls
Retrofit:
Storage/Utility
Add new Occupancy Sensor
and Improve Manual
Switching
$88 $450 2.95 5.1
6 Lighting * Controls
Retrofit: Office troffer
Add new Occupancy Sensor $210 $1,200 2.65 5.7
7 Lighting * Power
Retrofit: Exterior
recessed
Replace with 10 LED 100W
Module StdElectronic
$994 $6,000 2.55 6
8 Lighting * Power
Retrofit: Hall
Replace with 5 FLUOR (2)
T8 4' F32T8 32W Standard
Program HighEfficElectronic
$166 $1,000 2.55 6
9 Lighting * Combined
Retrofit: Classroom
Replace with 5 FLUOR (2)
T8 4' F32T8 32W Standard
Program HighEfficElectronic
and Add new Occupancy
Sensor, Multi*Level Switch
$185 $1,150 2.48 6.2
10 Lighting * Controls
Retrofit: Gym
Improve Manual Switching $38 $250 2.32 6.6
11 Lighting * Power
Retrofit: Exterior Small
Wallpack
Replace with 5 LED 40W
Module StdElectronic
$223 $2,000 1.72 9
12 Lighting * Combined
Retrofit: Restroom
Replace with 11 FLUOR (2)
T8 4' F32T8 32W Standard
Program HighEfficElectronic
and Add new Occupancy
Sensor
$231 $2,250 1.58 9.7
13 Lighting * Controls
Retrofit: Gym/MPR
Highbay
Add new Multi*Level Switch $350 $3,500 1.54 10
14 Garage Door: OHD Add R*5 insulating blanket to
garage door
$9 $84 1.38 9.2
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
15 Lighting * Combined
Retrofit: Office
Replace with 2 FLUOR (2)
T8 4' F32T8 32W Standard
Program HighEfficElectronic
and Add new Occupancy
Sensor and Improve Multi*
Level Switch
$49 $550 1.34 11.3
16 Lighting * Combined
Retrofit: Classroom
Replace with 3 FLUOR (2)
T8 4' F32T8 32W Standard
Program HighEfficElectronic
and Add new Occupancy
Sensor, Multi*Level Switch
$63 $750 1.29 11.9
17 Lighting * Combined
Retrofit: Office
Replace with 29 FLUOR (2)
T8 4' F32T8 32W Standard
Program HighEfficElectronic
and Add new Occupancy
Sensor, Multi*Level Switch
$440 $5,250 1.27 11.9
18 Lighting * Combined
Retrofit:
Storage/Utility
Replace with 42 FLUOR (2)
T8 4' F32T8 32W Standard
Program HighEfficElectronic
and Add new Occupancy
Sensor
$429 $5,700 1.14 13.3
19 HVAC And DHW Stack Economizer
installations & Summer
Boiler Shutdown
programming added
$2,011 $29,000 1.11 14.4
20 Lighting * Combined
Retrofit: Utility
Replace with 2 LED 4W
Module StdElectronic and
Add new Occupancy Sensor
$17 $200 1.11 12
21 Lighting * Controls
Retrofit: Storage
Utility
Add new Occupancy Sensor $31 $450 1.04 14.6
22 Lighting * Combined
Retrofit: Utility
Replace with 8 FLUOR T8 4'
F32T8 32W Standard
Program HighEfficElectronic
and Add new Occupancy
Sensor
$60 $900 1.02 15.1
23 Air Tightening Perform air sealing to reduce
air leakage by 15%.
$2,623 $25,000 0.94 9.5
24 Lighting * Power
Retrofit: Hall can light
Replace with 19 LED 12W
Module StdElectronic
$148 $2,850 0.80 19.2
25 Lighting * Combined
Retrofit: Classroom
restroom 2'X2'
Replace with 12 FLUOR (2)
T8 and Add new Occupancy
Sensor
$182 $3,600 0.77 19.8
26 Exterior Door: 1/2*lite
ext doors
Remove existing door and
install standard pre*hung U*
0.16 insulated door,
including hardware.
$157 $5,251 0.66 33.4
27 Lighting * Combined
Retrofit: Art
Replace with 8 FLUOR (3)
T5 45.2" F54W/T5 HO
Standard HighEfficElectronic
and Add new Occupancy
Sensor
$255 $5,950 0.65 23.4
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
28 Lighting * Combined
Retrofit: Library
Replace with 14 FLUOR (3)
T5 45.2" F54W/T5 HO
Standard HighEfficElectronic
and Add new Occupancy
Sensor, Multi*Level Switch
$349 $8,450 0.63 24.2
29 Lighting * Power
Retrofit: Art Storage
Replace with 4 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$11 $400 0.42 36.5
30 Other Electrical *
Power Retrofit: CP*5
Utility Bldg Loop
Replace with Circulation
Pump
$127 $3,000 0.36 23.7
31 Window/Skylight:
School South 3*pane
Windows
Install Lexan magnetic storm
window on interior
$98 $5,723 0.28 58.4
32 Window/Skylight:
School Not*South
Windows
Install single pane storm
window on exterior
$301 $20,600 0.23 68.5
33 Lighting * Power
Retrofit: Library
Replace with 5 LED 10W
Module StdElectronic
$10 $750 0.21 72.1
34 Window/Skylight:
School South 2*pane
Windows
Install single pane storm
window on exterior
$269 $23,100 0.19 85.7
35 Exterior Door: full
metal
Remove existing door and
install standard pre*hung U*
0.16 insulated door,
including hardware.
$9 $2,713 0.08 290.4
TOTAL $11,926 $175,422 0.96 14.7
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
ENERGY AUDIT REPORT – ENERGY CONSERVATION RECOMMENDATIONS
1. Building Envelope
Exterior Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
14 Garage Door: OHD Door Type: Metal*clad, 1*1/2"
polyurethane
Insulating Blanket: None
Modeled R*Value: 5.3
Add R*5 insulating blanket
to garage door
$84 $9
26 Exterior Door: 1/2*
lite ext doors
Door Type: Metal/FG half lite
Modeled R*Value: 2.2
Remove existing door and
install standard pre*hung U*
0.16 insulated door,
including hardware.
$5,251 $157
35 Exterior Door: full
metal
Door Type: Metal * urethane,
therm. break
Modeled R*Value: 5.3
Remove existing door and
install standard pre*hung U*
0.16 insulated door,
including hardware.
$2,713 $9
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
31 Window/Skylight:
School South 3*
pane Windows
Glass: Triple, Glass
Frame: Aluminum w/ Thermal
Break
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U*Value: 0.49
Solar Heat Gain Coefficient
including Window Coverings:
0.41
Install Lexan magnetic
storm window on interior
$5,723 $98
32 Window/Skylight:
School Not*South
Windows
Glass: Double, glass
Frame: Aluminum w/ Thermal
Break
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U*Value: 0.62
Solar Heat Gain Coefficient
including Window Coverings:
0.46
Install single pane storm
window on exterior
$20,600 $301
34 Window/Skylight:
School South 2*
pane Windows
Glass: Double, glass
Frame: Aluminum w/ Thermal
Break
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U*Value: 0.62
Solar Heat Gain Coefficient
including Window Coverings:
0.46
Install single pane storm
window on exterior
$23,100 $269
Air Leakage
Rank Location Estimated Air Leakage Recommended Air Leakage
Target
Installed
Cost
Annual
Energy
Savings
22 Air Tightness estimated as: 1.30
cfm/ft2 of above*grade shell
area at 75 Pascals
Perform air sealing to
reduce air leakage by 15%.
$25,000 $2,623
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
18 Stack Economizer installations & Summer Boiler Shutdown programming added $29,000 $2,011
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
1 Gym NL FLUOR T12 4' F40T12 40W
Standard Magnetic with Manual
Switching
Improve Manual Switching $1 $49
2 Classroom NL 2 FLUOR T8 4' F32T8 32W
Standard Program
StdElectronic with Manual
Switching
Improve Manual Switching $100 $42
3 Office NL 7 FLUOR T8 4' F32T8 32W
Standard Program
StdElectronic with Manual
Switching
Improve Manual Switching $350 $147
5 Storage/Utility 9 FLUOR (3) T8 4' F32T8 32W
Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor and Improve
Manual Switching
$450 $88
6 Office troffer 31 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching, Multi*Level Switch
Add new Occupancy
Sensor
$1,200 $210
7 Exterior recessed 10 HPS 250 Watt Magnetic
with On/Off Photoswitch
Replace with 10 LED
100W Module
StdElectronic
$6,000 $994
8 Hall 5 FLUOR (3) T12 4' F40T12
40W Standard (2) Magnetic
with Clock Timer or Other
Scheduling Control
Replace with 5 FLUOR (2)
T8 4' F32T8 32W Standard
Program
HighEfficElectronic
$1,000 $166
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
3. Appliances and Lighting
Lighting Fixtures and Controls
9 Classroom 5 FLUOR (3) T12 4' F40T12
40W Standard (2) Magnetic
with Manual Switching
Replace with 5 FLUOR (2)
T8 4' F32T8 32W Standard
Program
HighEfficElectronic and
Add new Occupancy
Sensor, Multi*Level Switch
$1,150 $185
10 Gym FLUOR (3) T12 4' F40T12
40W Standard (2) Magnetic
with Manual Switching
Improve Manual Switching $250 $38
11 Exterior Small
Wallpack
5 HPS 100 Watt Magnetic with
On/Off Photoswitch
Replace with 5 LED 40W
Module StdElectronic
$2,000 $223
12 Restroom 11 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Clock Timer or Other
Scheduling Control
Replace with 11 FLUOR
(2) T8 4' F32T8 32W
Standard Program
HighEfficElectronic and
Add new Occupancy
Sensor
$2,250 $231
13 Gym/MPR
Highbay
18 FLUOR (6) T5 45.2"
F54W/T5 HO Standard (2)
HighEfficElectronic with
Occupancy Sensor
Add new Multi*Level
Switch
$3,500 $350
15 Office 2 FLUOR (3) T12 4' F40T12
40W Standard (2) Magnetic
with Manual Switching, Multi*
Level Switch
Replace with 2 FLUOR (2)
T8 4' F32T8 32W Standard
Program
HighEfficElectronic and
Add new Occupancy
Sensor and Improve Multi*
Level Switch
$550 $49
16 Classroom 3 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 3 FLUOR (2)
T8 4' F32T8 32W Standard
Program
HighEfficElectronic and
Add new Occupancy
Sensor, Multi*Level Switch
$750 $63
17 Office 29 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 29 FLUOR
(2) T8 4' F32T8 32W
Standard Program
HighEfficElectronic and
Add new Occupancy
Sensor, Multi*Level Switch
$5,250 $440
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
3. Appliances and Lighting
Lighting Fixtures and Controls
19 Storage/Utility 42 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 42 FLUOR
(2) T8 4' F32T8 32W
Standard Program
HighEfficElectronic and
Add new Occupancy
Sensor
$5,700 $429
20 Utility 2 INCAN A Lamp, Halogen
60W with Manual Switching
Replace with 2 LED 4W
Module StdElectronic and
Add new Occupancy
Sensor
$200 $17
21 Storage Utility 7 FLUOR (2) T8 4' F32T8 32W
Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$450 $31
23 Utility 8 FLUOR T12 4' F40T12 40W
Standard Magnetic with Manual
Switching
Replace with 8 FLUOR T8
4' F32T8 32W Standard
Program
HighEfficElectronic and
Add new Occupancy
Sensor
$900 $60
24 Hall can light 19 FLUOR (1) 38W PAR CFL
with Manual Switching, Clock
Timer or Other Scheduling
Control
Replace with 19 LED 12W
Module StdElectronic
$2,850 $148
25 Classroom
restroom 2'X2'
12 FLUOR (2) T12 F40T12
35W U*Tube Energy*Saver
Magnetic with Manual
Switching
Replace with 12 FLUOR
(2) T8 and Add new
Occupancy Sensor
$3,600 $182
27 Art 8 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching, Multi*Level
Switch
Replace with 8 FLUOR (3)
T5 45.2" F54W/T5 HO
Standard
HighEfficElectronic and
Add new Occupancy
Sensor
$5,950 $255
28 Library 14 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 14 FLUOR
(3) T5 45.2" F54W/T5 HO
Standard
HighEfficElectronic and
Add new Occupancy
Sensor, Multi*Level Switch
$8,450 $349
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
3. Appliances and Lighting
Lighting Fixtures and Controls
29 Art Storage 4 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Occupancy Sensor
Replace with 4 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$400 $11
33 Library 5 FLUOR CFL, Spiral 23 W
with Manual Switching
Replace with 5 LED 10W
Module StdElectronic
$750 $10
Other Electrical Equipment
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
4 Portable 2 Representative load for
Portable Consumption Load
with Manual Switching
Replace with 2
Representative load for
Portable Consumption Load
$6,900 $1,558
30 CP*5 Utility Bldg
Loop
Circulation Pump with Manual
Switching, Clock Timer or
Other Scheduling Control
Replace with Circulation
Pump
$3,000 $127
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Appendix D
Energy Conservation Measures
Bear Valley Portable Buildings
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Setback Thermostat:
Portable Building
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Portable Building
space.
$491 $1,000 6.03 2
2 Lighting:
Relocatable Lighting
Replace with 17 FLUOR
(2) T8 4' F32T8 32W
Standard Program
HighEfficElectronic and
Add new Occupancy
Sensor, Multi*Level
Switch
$426 $3,150 2.08 7.4
3 Lighting:
Relocatable Lighting
Replace with FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor
$21 $300 1.08 14.2
4 Air Tightening Perform air sealing to
reduce air leakage by 30%.
$118 $1,500 0.69 12.7
TOTAL $1,056 $5,950 2.34 5.6
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
4 Air Tightness estimated as: 818
cfm at 50 Pascals
Perform air sealing to
reduce air leakage by 30%.
$1,500 $118
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
2. Mechanical Equipment
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
1 Portable Building Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Portable Building space.
$1,000 $491
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
2 Relocatable
Lighting
17 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 17 FLUOR
(2) T8 4' F32T8 32W
Standard Program
HighEfficElectronic and
Add new Occupancy
Sensor, Multi*Level Switch
$3,150 $426
3 Relocatable
Lighting
FLUOR (2) T12 F40T12 35W
U*Tube Energy*Saver Magnetic
with Manual Switching
Replace with FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor
$300 $21
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Appendix F
Site Visit Photos
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
1. Main Entrance 2. Roof Snow Drifts
3. Windstorm Damage – South Entrance 4. Portables
5. Utility Building 6. Boilers B*1 and B*2
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
7. Heating Circulation Pumps 8. Domestic Hot Water Heater
9. AHU*3 10. AHU*4
11. AHU*5 12. AHU*1
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
13. AHU*2 14. AHU*1 VFD
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Appendix G
Thermographic Photos
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
Coffman Engineers made miscellaneous thermographic images of Bear Valley Elementary 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, Main Entrance.
2. Thermographic Image, Main Entrance. Temperatures indicated by color scale on right. Yellow
indicates heat leakage. The outside temperature was about *5°F. Nominal heat loss is expected at
doors and windows
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
3. Optical Image, North face of West Wing. 4. Thermal Image, North face of West Wing.
5. Optical Image, West Doors 6. Thermal Image, West Doors.
7. Optical Image, Wall above wind damage,
South Entrance
8. Thermal Image, Wall above wind
damage, South Entrance
Bear Valley Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/12/2012 AkWarm No. CIRI*ANC*CAEC*09
9. Optical Image, Portable Building 10. Thermal Image, Portable Building
11. Optical Image, Utility Building 12. Thermal Image, Utility Building
13. Optical Image, Loading Dock 14. Thermal Image, Loading Dock
End of Report