HomeMy WebLinkAboutCAC-SWD-CAEC Seward High School 2012-EE
ENERGY AUDIT FINAL REPORT
Seward High School
2100 Swetmann Avenue
Seward, AK 99664
p (907) 224-3351
AkWarm ID No. CAC-SWD-CAEC-01
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
Seward High 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 ............................................................................................................................... 8
V.III ELECTRICAL DESCRIPTION ................................................................................................................................ 9
V.IV POOL EQUIPMENT DESCRIPTION ....................................................................................................................... 9
V.V OUTBUILDINGS DESCRIPTION ........................................................................................................................... 10
VI. Historic Energy Consumption and Cost............................................................................. 11
VI.I ELECTRICAL CONSUMPTION DATA ................................................................................................................... 11
VI.II FUEL OIL CONSUMPTION DATA ...................................................................................................................... 11
VI.III OVERALL ENERGY CONSUMPTION DATA ....................................................................................................... 11
VII. Equipment Inventory and Photo Survey .......................................................................... 13
VIII. Energy Conservation Measures ....................................................................................... 14
VIII.I ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION .......................................... 20
Appendices
Appendix A – Energy Benchmark Data
Appendix B – AkWarm Commercial Reports
Appendix C – Major Equipment List
Appendix D – Energy Conservation Measures
Appendix E – Site Visit Photos
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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
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.
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I. Executive Summary
This report presents the findings of an energy audit conducted at Seward 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
Kenai Peninsula Borough School District
Contact: Dave Spence
139 East Park Avenue
Soldotna, AK 99669
Email: dspence@kpbsd.k12.ak.us
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 July 2008-June 2010 documented annual utility costs at this facility are as follows:
Electricity $ 28,019
Fuel Oil #2 $266,854
Total $294,872
July 2008-June 2010 Energy Utilization Index (EUI) = 198.8 kBtu/sf
July 2008-June 2010 Energy Cost Index = 3.72 $/sf
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. A table of all ECMs considered is attached as Appendix D, Energy Conservation
Measures.
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Executive Summary – Recommended Energy Conservation Measures (ECMs)
Seward High School
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
SHS-1a Refrigerators Replace residential & light
commercial
refrigerators/freezers older
than 5 years old
-- - <10
SHS-2b Lighting:
Lightly Used
Office Space
Replace with 8 FLUOR (3)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy
Sensor
$565 $2,103 3.92 3.7
SHS-3c, g HVAC And
DHW
Repair Pumps with
Electronically Commutated
Motors Pumps
$7,355 $16,038 3.82 2.2
SHS-4d Lighting:
Class/Heavy
Use Office
Replace with 111 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add new
Occupancy Sensor
$5,692 $29,252 2.99 5.1
SHS-5 Lighting:
Gym
Replace with 24 FLUOR
(6) T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
and Add new Occupancy
Sensor, Multi-Level
Switch
$3,541 $23,300 2.43 6.6
SHS-6 Air
Tightening
Perform air sealing to
reduce air leakage by 10%.
$4,252 $20,000 2.18 4.7
SHS-7e Lighting:
Restroom/Lo
cker Room
Replace with 4 FLUOR T8
4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy
Sensor
$762 $4,553 2.17 6.0
SHS-8f Lighting:
Corridor/Libr
ary/Cafeteria
Replace with 8 FLUOR (2)
T5 45.2" F54W/T5 HO
Standard StdElectronic
$2,811 $20,175 2.15 7.2
SHS-9 Lighting:
Exterior
Lighting
Replace with 3 LED 150W
Module StdElectronic
$3,579 $44,150 1.25 12.3
SHS-10 Lighting:
Natatorium
Replace with 28 FLUOR
(6) T5 45.2" F54W/T5 HO
Standard StdElectronic and
Improve Manual Switching
$2,833 $28,001 1.56 9.9
SHS-11g Upgrade
Controls
Install DDC control system
to control temp setbacks,
outside air, and motor run
time
$23,161 $390,000 1.18 16.8
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Executive Summary – Recommended Energy Conservation Measures (ECMs)
Seward High School
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
SHS-12 Lighting:
Wrestling/Ra
quetball
Court/Wt
Room
Replace with 12 FLUOR
(6) T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
and Add new Occupancy
Sensor, Multi-Level
Switch
$777 $12,300 0.97 15.8
SHS-13 Cleaver-
Brooks
Boiler
Upgrades
Remove existing burners
and replace with
programmable Cleaver-
Brooks burners
$5,785 $120,000 0.93 20.7
SHS-14 Lighting:
Wrestling/Ra
quetball
Court/Wt
Room
Replace with 14 FLUOR
(3) T5 45.2" F28T5 28W
Standard StdElectronic and
Add new Occupancy
Sensor
$418 $10,150 0.63 24.3
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 This measure is an aggregate of ECMs #4, 5, 7, 9, and 23 in the AkWarm program. See Appendix D for details of individual
measures, and section VIII for summary descriptions.
c This item is intended to be implemented as HVAC pumps burn out and require replacement, when expenses must be made due
to equipment failure. This is the cost difference between standard efficient motors and high efficiency Electronically
Commutated Motors for all HVAC pumps.
Notes, Continued:
d This measure is an aggregate of ECMs #3, 13, and 18 in the AkWarm program. See Appendix D for details of individual
measures, and section VIII for summary descriptions.
e This measure is an aggregate of ECMs #2, 11, and 19 in the AkWarm program. See Appendix D for details of individual
measures, and section VIII for summary descriptions.
f This measure is an aggregate of ECMs #8, 12, 15, and 22 in the AkWarm program. See Appendix D for details of individual
measures, and section VIII for summary descriptions.
g ECM item was modeled with separate AkWarm model and as a result, the item is not an additive measure and is not included in
the final totals.
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II. Introduction
This energy audit was conducted for Seward High School (SHS), a 79,312 square foot (sf) campus that
includes a 76,725 sf school, an 1808 sf maintenance shop, and a 779 sf storage building. The school area
is comprised of classrooms, locker rooms, restrooms, administrative offices, a library, a gymnasium, and
a pool. The energy audit was conducted in order to evaluate areas and equipment where utility savings
relative to a baseline can be realized with a reasonable project financial ratios and payback.
Seward, Alaska – Google Maps
Seward High 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 fuel oil 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 the physical site investigation
(site visit).
The site visit was completed on June 30, 2011, and was spent inspecting the actual systems and answering
specific questions from the preliminary review. Our on-site contact during the investigation was Mr. John
Grimes of the KPBSD Maintenance Department1. Occupancy schedules, O&M practices, building energy
management program, and other information that has an impact on energy consumption were obtained.
After the site visit, the energy audit includes an evaluation of the information gathered, researching
possible conservation opportunities, organizing the audit into a comprehensive report, and making ECM
recommendations for mechanical, electrical, and building envelope improvements.
1 Mr. John Grimes, (907) 398-6915 (mobile), (907) 224-9530 (office)
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IV. Method of Analysis
Having completed the preliminary audit tasks noted in Section III, Coffman Engineers, Inc., (CEI)
conducted a site survey. The site survey provides critical input in deciphering where energy opportunities
exist within a facility. The audit team 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 audit.
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 baseline and proposed
energy modeling performed by AkWarm. The recommended ECMs focus on 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
Seward High School is a two story building with a variety of space usages and schedules. The exterior
structure of the building is constructed of plywood siding and precast concrete. The school was built in
1970. Major changes made include a re-roofing project in 1988 and the addition of a conditioned space
near the mechanical room to house two large hot water boilers in 1980. The two large boilers replaced the
eight hot water boilers originally installed in the mechanical room. 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. Additionally, the kitchen area of the school is utilized year round. During the school year it is
regularly used by school staff and during the summer it is used by private catering companies. The school
year runs from late August through late May.
There are two additional buildings on the property. One building is the new Maintenance and Operations
building for the maintenance staff. The other building is a storage building, formerly the maintenance
building. The new maintenance building is occupied from 7 a.m. until 5 p.m. five days a week all year,
while the storage building has no regular occupancy.
V.I School Architectural Description
Some areas of the building have exterior walls constructed of precast panels with an estimated R-value of
R-20. Exterior walls in such areas are composed of the following: 2.5” precast concrete panel, 2” rigid
insulation, 6” metal studwall with batt insulation fill, and 1/2” interior drywall. Other areas are
constructed of plywood siding, plywood sheathing, 6” metal studwall with batt insulation fill, and 1/2”
interior drywall. Wall heights in most of the building are 10 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 32
feet, and the metal shop and automotive shop areas have 20 foot walls. The site visit, in addition to
analysis of the construction drawings, shows that there are 5,660 sf of below-ground wall and 54,300 sf of
above ground wall. The two maintenance buildings contribute an additional approximately 3,700 sf of
above ground wall to the total wall square footage.
Floor construction for the school consists of below grade concrete floors. The depth of the floors below
grade varies around the building as the school was constructed into the hillside of the site. Below grade
floors are typically insulated with rigid insulation covering the foundation wall. The floor construction for
the maintenance building is slab on grade while the storage building has an exposed floor on pilings,
surrounded with a loosely insulated skirt. The slab on the maintenance building does not have any edge
insulation or exterior sheathing. There is approximately 54,756 sf of below grade floors for the school,
1,808 sf of slab on grade flooring for the maintenance building, and 779 sf of above grade floor area for
the storage building. The usable square footage of the school and the maintenance building is greater than
the building footprint square footage, as there is more than one floor within the building envelope.
Roof construction for the school is a built up flat roof containing a metal deck, a vapor barrier, and five
inches of rigid insulation. The approximate R-value for the roof construction is R-26. The original school
roof had additional insulation added in 1982, but the additional insulation had to be removed due to water
problems. During the winter, the snow would accumulate on the roof without melting. When the outdoor
temperature would increase, the melting snow would accumulate on the roof and cause leaks internally.
The roofs for both the maintenance building and the storage building are pitched roofs with attic space
provided between the trusses. It was assumed that two inches of fiberglass batt insulation was located
above the hard ceiling in the storage building for an overall construction R-value of R-10.5. For the
maintenance building, it was assumed that blown insulation was used in the attic space and an R-value of
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R-38 was used. Analysis of the buildings shows a roof area of approximately 54,800 sf for the school and
approximately 3,700 sf for the maintenance and storage buildings.
Typical window construction for the school consists of double pane, clear glass with a half inch air space
between the panes and a vinyl frame. An estimated insulating value of R-1.2 was given to all windows in
the school. The school’s window area for all windows facing south is approximately 600 square feet and
all other window areas for the school total approximately 900 square feet. The windows in the new
maintenance shop and storage building were also double pane, clear glass with a half inch air space
between the panes and a vinyl frame. The total window area for the maintenance shop is approximately
64 square feet and the area for the storage building is approximately 18 square feet.
V.II Mechanical Description
The school is heated using a combination of supply air fans equipped with hot water heating coils, and hot
water perimeter heat including cabinet unit heaters, unit heaters, and baseboard heat. Two fuel oil boilers,
with an output of 1,848 MBH each, provide hot water heat for the terminal equipment in the building in
addition to the hot water heater storage tank. The boilers are manufactured by Cleaver Brooks and are
equipped with a Gordon-Piatt fuel oil burner with a 14 GPH nozzle installed. A boiler circulation pump is
provided for each boiler. Hot water from the boiler is then piped to two 330 GPM Paco heating pumps,
with a branch line upstream of the pumps going to a shell and tube heat exchanger.
An Ajax WU40804055L shell and tube heat exchanger, 530 gallon storage tank is used to provide hot
water for school and kitchen areas. The domestic water line has a hot water recirculation line which is
circulated using a Grundfos circulating pump. The pool hot water is pumped using a Grundfos 155 GPM
pump. The hot water then goes to a shell and tube heat exchanger located in the mechanical room and is
then recirculated back to the boilers.
Conditioned air is provided to the building using eight supply air fans, S-1 through S-8. Each supply fan
is equipped with a hot water heating coil. Supply fans S-1 through S-6 also utilize pre-conditioned return
air that is supplied by return fans. The below table describes the location, area served, and airflow of each
supply fan.
SUPPLY FAN SUMMARY
Fan
Name Fan Manufacturer Fan Location Area
Served CFM
S‐1 Trane Room 301 Classrooms 35,000
S‐2 Trane Room 255 Gym 20,000
S‐3 Trane Room 255 Wrestling 5,100
S‐4 Trane Room 301 Pool 20,000
S‐5 Trane Room 302 Auditorium 12,500
S‐6 Pace Room 208 Kitchen 9,000
S‐7 American Air Filter Room 187 Kitchen 5,750
S‐8 Trane Mechanical
Room
Mechanical
Room 1,000
Air blenders are provided on S-7. The hot deck on each supply fan is constantly on, even in the summer.
Exhaust for the building is provided by 13 exhaust fans. Exhaust fans E-1, E-2, and E-12 are controlled
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by the building management system and are on during the day and turned off at night. Exhaust fans E-3
and E-4 are interlocked with supply fan S-1; exhaust fans E-10 and E-11 are interlocked with S-6. Manual
switches control both E-8 and E-13, while a motorized switch controls E-9. Exhaust fans E-5, E-6, and E-
7 cycle with building demand.
Within the main supply air ductwork, there are five hot water re-heat coils. The controls for the re-heat
coils are connected to the baseboard heat temperature sensors to maintain classroom temperatures above
65F. Fan coil units are also utilized to provide conditioned warm air to classroom areas and the handball
court. Three fan coil units are installed in the hallway of room 142 and are heated using hot water coils.
Another fan coil unit is installed in room 255 and provides conditioned air to the handball courts. All fan
coils are controlled by a two-way control valve.
The school’s building energy management and control system is controlled using pneumatic controls
operated by an air compressor utilizing both a 1.5HP motor and a 2HP motor. The system has been well
maintained and appeared to be in good working order during the site visit. Pneumatic systems, however,
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
The of the corridors, classrooms, offices, restrooms, kitchen, and cafeteria are primarily lit via 2-foot by
4-foot recessed luminaires equipped with two, three, four or six 32 watt (W) T-8 fluorescent lamps
depending on the application, however there are also a few incandescent lumiaires in these spaces. The
original fluorescent luminaires installed in the Seward High School equipped with fluorescent T12 lamps,
and magnetic ballasts. Nearly every luminaire has since been upgraded with T8 lamps and instant start
electronic ballasts. Though this upgrade provided significant energy savings these electronic instant start
ballasts are not compatible with the use of occupancy sensors for control since the frequent switching of
the ballasts associated with occupancy sensors shortens the life of the lamps. In general, areas that are lit
by fluorescent luminaires are over-lit according to the current IESNA standards. Most luminaires are
controlled by wall switches (both keyed and not) and very few occupancy sensors are used.
There are several high and low bay areas in the school that are illuminated with mercury vapor and metal
halide luminaires that are incompatible with occupancy sensors due to switching delays and re-strike
times. Mercury vapor luminaires are used in the racquetball court and in the central commons area. The
mercury vapor lamps are outdated and do not provide very good color rendering, additionally the
efficiency of mercury vapor lamps decreases significantly with time and energy savings may be higher
than the results from the AKWarm model indicates. The gymnasiums and pool are lit by metal halide
luminaires. The auditorium is lit by a mixture of incandescent luminaires on a dimmer switch and
fluorescent luminaires.
High pressure sodium (HPS) lamps are used exclusively for exterior lighting. They consist of a mixture of
pole mounted, wall pack and canopy luminaires that are controlled with a photocell to turn the lights off
during the day and a timer to turn the lights off during low use periods during the night. Many of the light
poles are in poor condition and have visible corrosion damage and may require replacement in the near
future.
V.IV Pool Equipment Description
The pool is served by filters, pumps, a heat exchanger, and a chlorinator. Pool capacity is approximately
164,000 gallons, and it is cycled through the filtration system approximately every 6 hours at a rate of 455
GPM by the recirculation pump. A chlorinator adds chlorine to the recirculation water at a rate of 25 lbs
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chlorine every 24 hours. Pool water heating is accomplished by heating glycol through a shell-and-tube
heat exchanger capable of 600 MBH. The glycol is heated by the boilers through a shell-and-tube heat
exchanger in the main mechanical room.
V.V Outbuildings Description
In the maintenance shop, heat is provided though radiant floor heating loops. Hot water is produced by a
Weil McLain 145MBH boiler with a Beckett burner. The boiler uses #2 fuel oil, supplied from a storage
tank located on the south side of the building. Hot water from the boiler is then pumped through a
Grundfos UP 26-64F circulation pump to three supply zones. Domestic hot water for the building is
provided by a Triangle Tube Smart 40 indirect water heater. A small Taco 007-F5 circulating pump is
provided for boiler water recirculation. There was no recirculation pump provided for the domestic hot
water. Electronic thermostats control zone temperatures in the maintenance shop heating system via
electric mixing valves. The heating system for the storage building consists of two electric unit heaters.
Each unit heater is 4 kilowatts. The unit heaters in the storage building are on all year.
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VI. Historic Energy Consumption and Cost
Tables provided in Appendix A, Energy Benchmark Data Report, represent the electric and fuel oil
energy usage for the surveyed facility from July 2008 to June 2010. Seward Public Utilities provides the
electricity and Jackson Enterprises, Inc., provides the fuel oil to the building. Both utilities bill under their
commercial rate schedules.
VI.I Electrical Consumption Data
The electric utility measures consumption and bills in kilowatt-hours (kWh) and maximum demand in
kilowatts (kW). One kWh usage is equivalent to 1,000 watts running for one hour. Demand charges are
based on the maximum number of kilowatts used measured over a 15 minute. The basic usage charges are
shown as generation service and delivery charges along with several non-utility generation charges.
Utility data used in this report reflects the historical data provided for the building in a summarized
format. The actual utility bills were not provided to be able to verify the data received to assure 100
percent accuracy of the data.
Upon review of the historic electrical consumption data, anomalies were discovered. Reasonable,
conservative calculations of annual consumption of documented lighting and equipment from the site visit
exceeded the documented consumption data provided to CEI for analysis. For comparison, the
documented electrical EUI for Seward High School was 7.15 kBtu/sf (average); for East Anchorage High
School, the electrical EUI is 35.3 kBtu/sf (average). Recovering or documenting such lost data is outside
of the scope of the energy audit, therefore the electrical consumption calculations were used as the input
data for the electrical model. However, it may be of interest to the School District to determine the reason
for the anomalies.
VI.II Fuel Oil Consumption Data
The fuel oil utility measures consumption and bills in gallons of fuel oil. The average heat value of fuel
oil #2 is 132,000 BTUs per gallon. Fuel oil is sold to the customer in units of gallons which is equal to
approximately 1.32 Therms of energy, or 132,000 Btu’s of heating power.
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.
Energy Cost and Consumption Data
2009 2010 Average
Electric 0.17 $/kWh 0.16 $/kWh 0.17 $/kWh
#2 Fuel Oil 2.42 $/Gal 2.20 $/Gal 2.32 $/Gal
Total Cost $323,212 $266,532 $294,872
ECI 4.08 $/sf 3.36 $/sf 3.72 $/sf
Electric EUI 7.3 kBtu/sf 7.0 kBtu/sf 7.15 kBtu/sf
#2 Fuel Oil EUI 202.1 kBtu/sf 181.2 kBtu/sf 191.7 kBtu/sf
Building EUI 209.5 kBtu/sf 188.2 kBtu/sf 198.8 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 79,312 square feet. This area includes the
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76,725 sf school building in addition to the 1,080 sf maintenance shop area and the 779 sf storage
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 E.
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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.
ECM# SHS-1 – 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 # SHS-2– Upgrade the Lighting in the Lightly Used Office Spaces
Annual Energy Savings Installed Cost SIR Payback (years)
$565 $2,103 3.92 3.7
This ECM is a compilation of ECMs #4, 5, 7, 9, and 23 in AkWarm, as shown in Appendix D, which are
intended to be implemented at the same time, however due to constraints with the AkWarm modeling
software the four lighting configurations were modeled separately.
Upgrading the lighting system in the lightly used office areas in the Seward High School would include
retrofitting the existing three and four lamp fluorescent luminaires with two lamp retrofit kits, replacing
the existing electronic instant start ballasts with program start ballasts in all fluorescent luminaires, re-
lamping the incandescent luminaires with CFL's and providing occupancy sensors for control. The
ballasts may be replaced as part of the normally scheduled maintenance program, the existing luminaires
may be controlled with occupancy sensors for only the cost of the occupancy sensor and wiring. the
ballast replacement would be no more costly than normal maintenance. The areas that are lit by the three
and four lamp luminaires are overlit according to the latest IESNA standards and the light fixtures may be
retrofitted with two lamp retrofit kits with no loss in performance. There are approximately 8 three lamp
and 10 four lamp luminaires that may be retrofitted in this process, and approximately 44 existing two
lamp luminaires that do not need modification beyond a ballast replacement. Re-lamping the
approximately 6 incandescent luminaires and retrofitting the three and four lamp luminaires while
providing approximately 12 occupancy sensors for control of the approximately 62 T8 and 6 CFL
luminaires in the lightly used offices would save approximately $565 annually.
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ECM # SHS-3 – Repair Burnout Motors with EC motors
Annual Energy Savings Installed Cost SIR Payback (years)
$12,579 $16,038 3.82 1.3
New, high efficiency pumps with electronically commutated (EC) motors have integral speed controls
which read system demand, allowing the pump to slow down with significant electrical savings.
Replacing the existing pumps with new pumps with EC motors now (while the existing motors are still
functional) will result in a $34,689 replacement cost with an annual energy savings of $12,579, with a
simple payback of 2.76. However, upgrading to pumps with EC motors when the existing pumps fail and
are in need of repair will offer a much better payback, because the marginal cost of choosing a high
efficiency EC motor over the standard efficiency replacement motor is only a $16,038 repair cost, since
the motor needs to be replaced anyway.
ECM # SHS-4 – Upgrade the Lighting in all Classrooms and Frequently Used Office Spaces
Annual Energy Savings Installed Cost SIR Payback (years)
$5,692 $29,252 2.99 5.1
This ECM is a compilation of ECMs #3, 13, and 18 in AkWarm, as shown in Appendix D, which are
intended to be implemented at the same time, however due to constraints with the AkWarm modeling
software the three lighting configurations were modeled separately.
Upgrading the lighting system in the classrooms and heavily used office areas in the Seward High School
would include retrofitting the existing three and four lamp fluorescent luminaires with two lamp retrofit
kits, replacing the existing electronic instant start ballasts with program start ballasts in all fluorescent
luminaires, and providing occupancy sensors for control. The ballasts may be replaced as part of the
normally scheduled maintenance program; the existing luminaires may be controlled with occupancy
sensors for only the cost of the occupancy sensor and wiring. The ballast replacement would be no more
costly than normal maintenance. The areas that are lit by the three and four lamp luminaires are overlit
according to the latest IESNA standards and the light fixtures may be retrofitted with two lamp retrofit
kits with no loss in performance. There are approximately 157 three lamp and 51 four lamp luminaires
that may be retrofitted in this process, and approximately 111 existing two lamp luminaires that do not
need modification beyond a ballast replacement. Retrofitting the three and four lamp luminaires and
providing approximately 38 occupancy sensors for control of the approximately 319 T8 luminaires in the
classrooms and heavily used offices would save approximately $5,690 annually.
Note: the above listed lighting upgrades do not include retrofits and control modifications in classrooms
such as the home-economics room or the shops since they are of a more critical use and a decrease in
lighting level or change in lighting controls may be detrimental.
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ECM # SHS-5–Replace Gym Lighting with T5HO High Bay Luminaires, and Install Occupancy
Sensors and Bi-Level Control
Annual Energy Savings Installed Cost SIR Payback (years)
$3,541 $23,300 2.43 6.6
The gymnasium in the Seward High School is currently lit by approximately 24 400W Metal Halide
luminaires. These fixtures are not compatible with occupancy sensors because of a long start time.
Replacing the existing luminaires with six-lamp T5HO luminaires with occupancy sensor control, and
multi level switching, would save approximately $3,540 annually.
ECM # SHS-6 – Perform Air Sealing to Reduce Air Leakage by 10%
Annual Energy Savings Installed Cost SIR Payback (years)
$4,252 $20,000 2.19 4.7
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. If a 10% reduction in leakage is achieved at a cost of $20,000, approximately $4,252 will
be saved annually.
ECM# SHS-7 - Upgrade the Lighting in all Restrooms and Locker Rooms
Annual Energy Savings Installed Cost SIR Payback (years)
$762 $4,553 2.17 6.0
This ECM is a compilation of ECMs #2, 11, and 19 in AkWarm, as shown in Appendix D, which are
intended to be implemented at the same time, however due to constraints with the AkWarm modeling
software the three lighting configurations were modeled separately.
Upgrading the lighting system in the restrooms and locker rooms in the Seward High School would
include the replacing the existing electronic instant start ballasts with program start ballasts in all
fluorescent luminaires, re-lamping the existing incandescent luminaires with compact fluorescent lamps
(CFL's) and providing occupancy sensors for control. The ballasts may be replaced as part of the normally
scheduled maintenance program; the existing luminaires may be controlled with occupancy sensors for
only the cost of the occupancy sensor and wiring. The ballast replacement would be no more costly than
normal maintenance. Re-lamping the approximately 16 incandescent luminaires with CFL's and providing
approximately 29 occupancy sensors for control of the approximately four single lamp, and 64 two lamp
T8 fixtures, and 16 CFL's in restrooms and locker rooms would save approximately $760 annually.
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ECM # SHS-8 – Upgrade the Lighting in the Corridors and Common Areas
Annual Energy Savings Installed Cost SIR Payback (years)
$2,811 $20,175 2.15 7.2
This ECM is a compilation of several ECMs #8, 12, 15, and 22 in AkWarm, as shown in Appendix D,
which are intended to be implemented at the same time, however due to constraints with the AkWarm
modeling software the four lighting configurations were modeled separately.
Upgrading the lighting system in the corridors, commons areas, and library in the Seward High School
would include retrofitting the existing three lamp fluorescent T8 luminaires with two lamp retrofit kits,
replacing the existign 4' by 4' six lamp T8 luminaires with 2' by 4' two lamp T8 luminaires, replacint the
mercury vapor luminaires with two lamp T5HO luminaires. The areas that are lit by the three lamp
luminaires are overlit according to the latest IESNA standards and the light fixtures may be retrofitted
with two lamp retrofit kits, and the six lamp T8 luminaires may be replaced with three lamp T8
luminaires with no loss in performance. There are approximately 870 three lamp and 21 six lamp
luminaires that may be upgraded in this process, and approximately 133 existing two lamp luminaires that
do not need modification. The 12 250W mercury vapor luminaires may be replaced with two lamp T5HO
luminaires on a one for one replacement, and the six 175W mercury vapor luminaires may be replaced
with four two lamp T5HO luminaires. Upgrading the lighting systems in the library, corridors and public
areas would save approximately $2,810 annually.
ECM # SHS-9 – Upgrade the Exterior Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$3,579 $44,150 1.25 12.3
This ECM is a compilation of ECMs #6, 16, 21, 24, and 25 in AkWarm, as shown in Appendix D, which
are intended to be implemented at the same time, however due to constraints with the AkWarm modeling
software the five lighting configurations were modeled separately.
Upgrading the exterior lighting system at the Seward High School includes replacing all of the HPS
luminaires with LED's and replacing the light poles. The benefits of providing LED's as replacement for
the existing HPS luminaires include energy savings and improved color rendering. The existing light
poles in the driving ad parking areas surrounding the high school show damage from corrosion and would
need to be replaced with the new LED retrofit. Replacing all approximately 24 HPS exterior wall pack
and 16 pole mounted luminaires with LED luminaires would save approximately $3,660 annually.
ECM # SHS-10 – Upgrade the Natatorium Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$2,833 $28,001 1.56 9.9
The pool in the Seward High School is currently lit by approximately twenty-eight (28) 400W Metal
Halide luminaires. These fixtures are not compatible with frequent switching because of a long start time
and are therefore left on for long periods of time. By replacing the existing luminaires with six lamp
T5HO luminaires with occupancy sensor control, approximately $2,835 will be saved annually.
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ECM # SHS-11 – Upgrade Control System to DDC Controls
Annual Energy Savings Installed Cost SIR Payback (years)
$23,161 $390,000 1.19 16.8
The existing controls at Seward High School are pneumatic controls, which allow limited feedback and
control of the building’s mechanical system. Upgrading the building control system to a Direct Digital
Control (DDC) system will offer significantly more control over the mechanical system and allow
significant energy savings to be had. When upgrading the control system to new DDC controls there are
two options: 1) installing DDC controls with new DDC compatible electric actuators or 2) installing DDC
controls with electric-to-pneumatic (E/P) transducers to operate existing pneumatic actuators. The second
option was evaluated in this ECM, as it will involve less material and installation costs because existing
pneumatic actuators can be used. Using a DDC system for high level mechanical control will allow
automatic temperature setbacks, reduced motor run time and reduced AHU operations and better outdoor
air intake control. A new DDC system will cost approximately $390,000 and can save $23,161 annually.
ECM # SHS-12 –Replace Wrestling Room Lighting with T5HO High Bay Luminaires, and Install
Occupancy Sensors and Bi-Level Control
Annual Energy Savings Installed Cost SIR Payback (years)
$777 $12,300 0.97 15.8
Though this ECM does not have a SIR above one according to the AkWarm model, it should still be
considered as both an energy conservation measure, and to increase the performance of the wrestling
room. The wrestling room in the Seward High School is currently lit by approximately 12 400W Metal
Halide luminaires. These fixtures are not compatible with occupancy sensors because of a long start time.
Replacing the existing luminaires with six lamp T5HO luminaires with occupancy sensor control, and
multi level switching could save approximately $780 annually.
ECM # SHS-13 – Cleaver-Brooks Boiler Upgrades
Annual Energy Savings Installed Cost SIR Payback (years)
$5,785 $120,000 0.93 20.7
Though this ECM does not have a SIR above one according to the AkWarm model, it should still be
considered as both an energy conservation measure, and to increase the performance of the mechanical
system. Cleaver-Brooks (C-B) boilers are strongly recommended to be used with C-B burners. This ECM
would remove the existing burners and replace them with C-B burners. Integral controls which can be
provided with C-B burners can provide better modulation, scheduling, and programming of the burner,
yielding a more efficient use of fuel.
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ECM # SHS-14 –Replace Racquet Ball Court Lighting with T5HO High Bay Luminaires, and
Install Occupancy Sensors for Control
Annual Energy Savings Installed Cost SIR Payback (years)
$418 $10,150 0.63 24.3
Though this ECM does not have a SIR above one according to the AKWarm model, it should still be
considered as both an energy conservation measure, and to increase the performance of the racquetball
court. The racquet ball court in the Seward High School is currently lit by approximately 14 175W
Mercury Vapor luminaires. These fixtures are not compatible with occupancy sensors because of a long
start time. Replacing the existing luminaires with four lamp T5HO luminaires with occupancy sensor
control could save approximately $420 annually.
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VIII.I 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
Seward High School Draft Energy Audit Report
First Name Last Name Middle Name Phone
Paul Brenner 907-714-8825
State Zip
AK 99669
Monday-
Friday
Saturday Sunday Holidays
7 to 5 0 0 0
Average # of
Occupants
During
230 0 0 0
Renovations / Notes
Date
1977
1982
KPBSD Municipal Government/Subdivision 03/15/11
REAL Preliminary Benchmark Data Form
PART I – FACILITY INFORMATION
Facility Owner Facility Owned By Date
Building Name/ Identifier Building Usage Building Square Footage
Seward High Education 79,312
Building Type Community Population Year Built
School 2,830 1970
Facility Address Facility City Facility Zip
PO Box 1049 Seward 99664
Contact Person
Email
pbrenner@kpbsd.k12.ak.us
Mailing Address City
148 N. Binkley St Soldotna
Primary
Operating
Hours
Details
Unknown Renovation
Unknown Renovation1982
Notes:
PART II – ENERGY SOURCES
Heating Oil Electricity Natural Gas Propane Wood Coal
$ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton
Other energy
sources?
Describe
Unknown Renovation
2. Provide utilities bills for the most recent two-year period for each energy source you use.
Any drawings available are kept at district maintenance department in Soldotna.
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.
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Seward High School Draft Energy Audit Report
Seward High
Buiding Size Input (sf) =79,312
2009 Natural Gas Consumption (Therms)
2009 Natural Gas Cost ($)
2009 Electric Consumption (kWh)170,106
2009 Electric Cost ($)29,483
2009 Oil Consumption (Therms)160,318
2009 Oil Cost ($)293,729
2009 Total Energy Use (kBtu)16,612,368
2009 Total Energy Cost ($)323,212
Annual Energy Use Intensity (EUI)
2009 Electricity (kBtu/sf)7.3
2009 Oil (kBtu/sf) 202.1
2009 Energy Utilization Index (kBtu/sf)209.5
Annual Energy Cost Index (ECI)
2009 Electric Cost Index ($/sf)0.37
2009 Oil Cost Index ($/sf)3.70
2009 Energy Cost Index ($/sf)4.08
2010 Electric Consumption (kWh)162,257
2010 Electric Cost ($)26,5542010 Electric Cost ($)26,554
2010 Oil Consumption (Therms)143,715.00
2010 Oil Cost ($)239,978
2010 Total Energy Use (kBtu)14,925,283
2010 Total Energy Cost ($)266,532
Annual Energy Use Intensity (EUI)
2010 Electricity (kBtu/sf)7.0
2010 Oil (kBtu/sf)181.2
2010 Energy Utilization Index (kBtu/sf)188.2
Annual Energy Cost Index (ECI)
2010 Electric Cost Index ($/sf)0.33
2010 Oil Cost Index ($/sf)3.03
20010 Energy Cost Index ($/sf)3.36
Note:
1 kWh = 3,413 Btu's
1 Therm = 100,000 Btu's
1 CF ≈ 1,000 Btu's
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Seward High SchoolDraft Energy Audit ReportSeward 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 ($)Seward Public 520-02 Jul-08 7/12/2008 8/11/2008319,90033827$1,480$0.15Seward Public 520-02 Aug-08 8/12/2008 9/10/20083014,58049843$2,332$0.16Seward Public 520-02 Sep-08 9/11/2008 10/13/20083316,84857547$2,965$0.18Seward Public 520-02 Oct-08 10/14/2008 11/11/20082914,94051047$2,464$0.16Seward Public 520-02 Nov-08 11/12/2008 12/15/20083418,00061452$2,821$0.16Seward Public 520-02 Dec-08 12/16/2008 1/14/20093014,04047952$2,467$0.18Seward Public 520-02 Jan-09 1/15/2009 2/10/20092715,42052656$2,754$0.18Seward Public 520-02 Feb-09 2/11/2009 3/11/20092915,98654656$3,148$0.20Seward Public 520-02 Mar-09 3/12/2009 4/13/20093315,48052849$2,627$0.17Seward Public 520-02 Apr-09 4/14/2009 5/11/20092814,04047947$2,546$0.18Seward Public 520-02 May-09 5/12/2009 6/11/20093111,52039343$2,090$0.18Seward Public 520-02 Jun-09 6/12/2009 7/13/2009329,35231932$1,789$0.19Seward Public 520-02 Jul-09 7/14/2009 8/12/2009308,28028325$1,576$0.19Seward Public 520-02 Aug-09 8/13/2009 9/10/20092912,91244145$2,260$0.18Seward Public 520-02 Sep-09 9/11/2009 10/11/20093115,29052245$2,540$0.17Seward Public 520-02 Oct-09 10/12/2009 11/12/20093215,66053445$2,410$0.15Seward Public 520-02 Nov-09 11/13/2009 12/13/20093115,66053426$2,277$0.15Seward Public520-02Dec-0912/14/20091/12/20103014,22048526$2,152$0.15Seward Public520-02Dec-0912/14/20091/12/20103014,22048526$2,152$0.15Seward Public 520-02 Jan-10 1/13/2010 2/11/20103014,22048528$2,425$0.17Seward Public 520-02 Feb-10 2/12/2010 3/11/20102816,60256727$2,713$0.16Seward Public 520-02 Mar-10 3/12/2010 4/12/20103214,58049826$2,185$0.15Seward Public 520-02 Apr-10 4/13/2010 5/11/20102914,04047927$2,328$0.17Seward Public 520-02 May-10 5/12/2010 6/13/20103311,83040423$2,074$0.18Seward Public 520-02 Jun-10 6/14/2010 7/13/2010298,96330619$1,614$0.18Jul - 08 to Jun - 09 total:170,1065,806551$29,483$0Jul - 09 to Jun - 10 total:162,2575,538362$26,554$0Jul - 08 to Jun - 09 avg:$0.1733Jul - 09 to Jun - 10 avg:$0.1637Coffman Engineers, Inc.AkWarm No CAC-SWD-CAEC-01Seward High School Energy Audit Report Coffman Engineers, Inc. AkWarm No. CAC-SWD-CAEC-01 Seward High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Seward High SchoolDraft Energy Audit Report$1,500$2,000$2,500$3,000$3,5006,0008,00010,00012,00014,00016,00018,00020,000Electric Cost ($)Electric Consumption (kWh)Seward High - Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)Coffman Engineers, Inc.AkWarm No. CAC-SWD-CAEC-01$0$500$1,00002,0004,0006,000Date (Mon - Yr)Seward High School Energy Audit Report Seward High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Seward High SchoolDraft Energy Audit ReportSeward HighOilBtus/Gal =132,000Provider Customer # Month Start Date End Date Billing Days Consumption (Gal) Consumption (Therms) Demand Use Oil Cost ($) Unit Cost ($/Therm) Demand Cost ($)Jackson8Jul-08 7/1/2008 7/31/2008309,99113,188$44,0713.34Jackson8 Aug-08 8/1/2008 8/31/2008308,62011,378$35,3413.11Jackson8 Sep-08 9/1/2008 9/30/2008294,2005,544$15,5452.80Jackson8 Oct-08 10/1/2008 10/31/20083011,79115,564$33,3502.14Jackson8 Nov-08 11/1/2008 11/30/20082911,78715,559$27,9501.80Jackson8 Dec-08 12/1/2008 12/31/20083012,97017,120$23,9331.40Jackson8Jan-09 1/1/2009 1/31/20093011,99315,831$22,6171.43Jackson8 Feb-09 2/1/2009 2/28/20092710,35413,667$17,8101.30Jackson8 Mar-09 3/1/2009 3/31/20093013,50017,820$22,3761.26Jackson8 Apr-09 4/1/2009 4/30/20092910,40013,728$18,7031.36Jackson8 May-09 5/1/2009 5/31/2009306,7028,847$12,1331.37Jackson8Jun-09 6/1/2009 6/30/2009299,14512,071$19,9001.65Jackson8Jul-09 7/1/2009 7/31/20093000$00.00Jackson8 Aug-09 8/1/2009 8/31/2009309,68212,780$22,1771.74Jackson8 Sep-09 9/1/2009 9/30/2009299,85913,014$21,3381.64Jackson8 Oct-09 10/1/2009 10/31/2009307,5409,953$16,9721.71Jackson8 Nov-09 11/1/2009 11/30/2009299,91513,088$23,7601.82Jackson8Dec-0912/1/200912/31/20093015,26820,154$35,8091.78Jackson8Dec-0912/1/200912/31/20093015,26820,154$35,8091.78Jackson8Jan-101/1/20101/31/20103017,73523,410$22,0270.94Jackson8Feb-102/1/20102/28/20102711,20214,787$26,3341.78Jackson8Mar-103/1/20103/31/20103010,08213,308$25,2731.90Jackson8Apr-104/1/20104/30/2010298,40611,096$22,2212.00Jackson8May-105/1/20105/31/2010306,0648,004$16,0142.00Jackson8Jun-106/1/20106/30/2010293,1224,121$8,0531.95Jul - 08 to Jun - 09 total:121,453160,3180$293,729$0Jul - 09 to Jun - 10 total:108,875143,7150$239,978$0Jul - 08 to Jun - 09 avg:2.4185Jul - 09 to Jun - 10 avg:2.2042Coffman Engineers, Inc.AkWarm No CAC-SWD-CAEC-01Seward High School Energy Audit Report Seward High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Seward High SchoolDraft Energy Audit Report$15,000.00 $20,000.00 $25,000.00 $30,000.00 $35,000.00 $40,000.00 $45,000.00 $50,000.00 10,00015,00020,00025,000Oil Cost ($)Oil Consumption (Therms)Seward High - Oil Consumption (Therms) vs. Oil Cost ($)Oil Consumption (Therms)Oil Cost ($)Coffman Engineers, Inc.AkWarm No. CAC-SWD-CAEC-01$0.00 $5,000.00 $10,000.00 05,000Date (Mon - Yr)Seward High School Energy Audit Report Seward High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Appendix B
AkWarm Commercial Reports
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 10/24/2011
1:55pm
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Seward High School Auditor Company: Coffman Engineers, Inc.
Address: 2100 Swetmann Avenue Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Seward Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Paul Brenner
Client Address: 148 N. Binkley Street
Soldotna, AK 99669
Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-5042
Client Phone: (907) 714-8825 Auditor Comment:
Client FAX:
Design Data
Building Area: 79,312 square feet. This area
includes a 76,725 sf school, a 1,808 sf maintenance
shop, and a 779 sf storage building.
Design Heating Load: Design Loss at Space:
2,320,300 Btu/hour
with Distribution Losses: 2,343,737 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency
and 25% Safety Margin: 3,572,770 Btu/hour
Note: Additional Capacity should be added for DHW
load, if served.
Typical Occupancy: 265 people Design Indoor Temperature: 71.7 deg F (building
average)
Actual City: Seward Design Outdoor Temperature: 7 deg F
Weather/Fuel City: Seward Heating Degree Days: 9,188 deg F-days
Utility Information
Electric Utility: Seward, City of - Commercial - Lg Natural Gas Provider: None
Average Annual Cost/kWh: $0.170/kWh Average Annual Cost/ccf: $0.000/ccf
Seward High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01 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 $286,264 $0 $19,257 $45,180 $1,627 $7,850 $353 $48,214 $0 $408,746 With Proposed Retrofits $274,465 $0 $18,973 $24,071 $1,627 $7,850 $353 $48,214 $0 $375,554 SAVINGS $11,799 $0 $284 $21,109 $0 $0 $0 $0 $0 $33,192
Seward High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01 $0$100,000$200,000$300,000$400,000$500,000Existing RetrofitVentilation and FansSpace HeatingOther ElectricalLightingDomestic Hot WaterCookingClothes DryingAnnual Energy Costs by End Use-$50,000 $0 $50,000 $100,000 $150,000 $200,000 $250,000FloorWall/DoorWindowCeilingAirExistingRetrofitAnnual Space Heating Cost by Component
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Appendix C
Major Equipment List
Seward High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE ESTIMATED REMAINING USEFUL LIFE B-1 BOILER RM BUILDING HEATING CAST IRON #2 FUEL OIL 3036 MBH ≈ 85% 30 ≈ 5 B-2 BOILER RM BUILDING HEATING CAST IRON #2 FUEL OIL 3036 MBH ≈ 85% 30 ≈ 5 B-3 MAINT. BLDG. BUILDING HEATING WEIL-MCLAIN P-WGO-4 CAST IRON #2 FUEL OIL 145 MBH ≈ 85% 1/7 30 23 P-1 BOILER RM HEATING WATER CIRC PACO INLINE 300GPM 60' 89.5 10 10 0 P-2 BOILER RM HEATING WATER CIRC PACO INLINE 300GPM 60' 89.5 10 10 0 P-3 BOILER RM POOL/DOMESTIC WATER BALDOR INLINE 150GPM 40' NEMA STANDARD 3 10 0 P-4 BOILER RM DOMESTIC HOT WATER RECIRC GRUNDFOS INLINE 10GPM 5' NEMA STANDARD 1/12 10 0 S-1 PENTHOUSE CLASSROOM SUPPLY TRANE CLIMATE CHANGER 63 CENTRIFUGAL 35000CFM 2.75" ≈ 75% 30 25 0 S-2 GYM MECH RM GYMNASIUM SUPPLY TRANE CLIMATE CHANGER 33 CENTRIFUGAL 20000CFM 2" ≈ 75% 15 25 0 S-3 GYM MECH RM WRESTLING SUPPLY TRANE CLIMATE CHANGER W CENTRIFUGAL 5100CFM 1.5" ≈ 75% 3 25 0 S-4 PENTHOUSE POOL SUPPLY TRANE CLIMATE CHANGER 35 CENTRIFUGAL 20000CFM 2" ≈ 75% 15 25 0
Seward High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE ESTIMATED REMAINING USEFUL LIFE S-5 AUDITORIUM MECH RM AUDITORIUM SUPPLY TRANE CLIMATE CHANGER TYPE 21 CENTRIFUGAL MULTI-ZONE 12500CFM 1.5" ≈ 75% 7.5 25 0 S-6 KITCHEN KITCHEN & CAFETERIA SUPPLY PACE A22 CENTRIFUGAL 9000CFM 1.5" ≈ 75% 5 25 0 S-7 IND. ARTS MECH RM INDUSTRIAL ARTS SUPPLY AMERICAN AIR FILTER SERVISIDE SP AIR HANDLER 5750CFM 1.5" ≈ 75% 5 25 0 S-8 BOILER RM BOILER RM SUPPLY PROPELLER 1000CFM .25" ≈ 75% 1/12 15 0 R-1 PENTHOUSE CLASSROOM RETURN TWIN CITY 365 CENTRIFUGAL 26000CFM .75" NEMA STANDARD 7.5 25 0 R-2 ROOF GYM RELIEF ACME SKYMASTER - PROPELLER 16000CFM .25" NEMA STANDARD 3 15 0 R-3 ROOF WRESTLING RELIEF GREENHECK S-203-C-X PROPELLER 4000CFM .25" NEMA STANDARD 0.75 15 0 R-4 PENTHOUSE POOL RETURN - - CABINET FAN 20000CFM .75" NEMA STANDARD 5 25 0 R-5 AUDITORIUM MECH RM AUDITORIUM RETURN TWIN CITY BAF DWDI CL1 270 CENTRIFUGAL 12500CFM .75" NEMA STANDARD 3 25 0 R-6 ROOF KITCHEN & CAFETERIA RELIEF TWIN CITY - PROPELLER 5000CFM .25" NEMA STANDARD 0.75 15 0 R-7 ROOF INDUSTRIAL ARTS RELIEF GREENHECK S-203-C-X PROPELLER 4500CFM .25" NEMA STANDARD 0.75 15 0
Seward High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE ESTIMATED REMAINING USEFUL LIFE E-1 PENTHOUSE CLASSROOM TOILET EXHAUST TWIN CITY - ROOF MOUNTED 3400CFM .75" NEMA STANDARD 1 25 0 E-2 PENTHOUSE LOCKER ROOM EXHAUST - - ROOF MOUNTED 4850CFM .75" NEMA STANDARD 1.5 25 0 E-3 ROOF LAB EXHAUST - - ROOF MOUNTED 3500CFM 1.25" NEMA STANDARD 1.5 25 0 E-4 ROOF HOME EC. EXHAUST - - ROOF MOUNTED 1000CFM .675" NEMA STANDARD 1/3 25 0 E-5 POOL EQUIP. RM POOL EQUIPMENT ROOM EXHAUST - - ROOF MOUNTED 400CFM .25" NEMA STANDARD 1/4 15 0 E-6 CHLORINE RM CHLORINE ROOM EXHAUST - - ROOF MOUNTED 350CFM .25" NEMA STANDARD 1/4 15 0 E-7 GREEN-HOUSE GREENHOUSE EXHAUST - - ROOF MOUNTED 500CFM .125" NEMA STANDARD 1/10 15 0 E-8 IND. ARTS WELDING HOOD EXHAUST - - ROOF MOUNTED 1800CFM 1" NEMA STANDARD 1/2 25 0 E-9 ROOF KILN HOOD EXHAUST - - ROOF MOUNTED 300CFM .25" NEMA STANDARD 1/4 15 0 E-10 ROOF TOILET EXHAUST (KITCHEN AREA) - - ROOF MOUNTED 225CFM .375" NEMA STANDARD 1/4 25 0 E-11 ROOF DISHWASHER EXHAUST - - ROOF MOUNTED 600CFM .375" NEMA STANDARD 1/4 25 0
Seward High School Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE ESTIMATED REMAINING USEFUL LIFE E-12 ROOF GRILLE & KETTLE EXHAUST HOOD - - ROOF MOUNTED 2500CFM 1.75" NEMA STANDARD 1.5 25 0 E-13 ROOF OVEN EXHAUST HOOD - - ROOF MOUNTED 1500CFM 1.75" NEMA STANDARD 3/4 25 0
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Appendix D
Energy Conservation Measures
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
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 a Refrigerators Replace residential & light
commercial
refrigerators/freezers older
than 5 years old
- - - <10
2 b Lighting:
Restroom/Locker
Room
Replace with 4 FLUOR T8
4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$9 $2 53.00 0.2
3 b Lighting:
Class/Heavy Use
Office
Replace with 111 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add new
Occupancy Sensor
$1,429 $2,401 9.16 1.7
4 b Lighting: Lightly
Used Office Space
Replace with 8 FLUOR (3)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$70 $151 7.17 2.1
5 Lighting: Lightly
Used Office Space
Add new Occupancy Sensor $65 $150 6.66 2.3
6 Lighting: Exterior
Lighting
Replace with 3 LED 150W
Module StdElectronic
$441 $1,650 4.11 3.7
7 b Lighting: Lightly
Used Office Space
Replace with 10 FLUOR (4)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$116 $451 3.97 3.9
8 b Lighting:
Corridor/Library/C
afeteria
Replace with 8 FLUOR (2)
T5 45.2" F54W/T5 HO
Standard StdElectronic
$1,016 $4,000 3.91 3.9
9 b Lighting: Lightly
Used Office Space
Replace with 44 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$262 $1,051 3.84 4
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
10 c,d HVAC And DHW Repair Pumps with EC
Pumps
$7,355 $16,038 3.82 2.2
11 b Lighting:
Restroom/Locker
Room
Replace with 16 FLUOR
CFL, A Lamp 20W and Add
new Occupancy Sensor
$474 $1,850 2.97 3.9
12 Lighting:
Corridor/Library/C
afeteria
Replace with 21 FLUOR (3)
T8 4' F32T8 32W Standard
Instant StdElectronic
$705 $3,675 2.95 5.2
13 Lighting:
Class/Heavy Use
Office
Replace with 157 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add new
Occupancy Sensor
$4,044 $24,900 2.50 6.2
14 Lighting: Gym Replace with 24 FLUOR (6)
T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
and Add new Occupancy
Sensor, Multi-Level Switch
$3,541 $23,300 2.43 6.6
15 Lighting:
Corridor/Library/C
afeteria
Replace with 4 FLUOR (2)
T5 45.2" F54W/T5 HO
Standard StdElectronic
$307 $2,000 2.37 6.5
16 b Lighting: Exterior
Lighting
Replace with LED 115W
Module StdElectronic
$82 $550 2.29 6.7
17 Air Tightening Perform air sealing to reduce
air leakage by 10%.
$4,243 $20,000 2.18 4.7
18 Lighting:
Class/Heavy Use
Office
Replace with 51 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$219 $1,951 1.73 8.9
19 b Lighting:
Restroom/Locker
Room
Replace with 64 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$279 $2,701 1.59 9.7
20 Lighting:
Natatorium
Replace with 28 FLUOR (6)
T5 45.2" F54W/T5 HO
Standard StdElectronic and
Improve Manual Switching
$2,833 $28,001 1.56 9.9
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
21 c Lighting: Exterior
Lighting
Replace with 13 LED 80W
Module StdElectronic
$591 $6,500 1.40 11
22 Lighting:
Corridor/Library/C
afeteria
Replace with 70 FLUOR (2)
T8 4' F32T8 32W Standard
Instant StdElectronic
$783 $10,500 1.15 13.4
23 c Lighting: Lightly
Used Office Space
Replace with 6 FLUOR
CFL, A Lamp 20W
$52 $300 1.11 5.8
24 Lighting: Exterior
Lighting
Replace with 16 LED 150W
Module StdElectronic
$2,349 $33,000 1.10 14
25 Lighting: Exterior
Lighting
Replace with 7 LED 50W
Module StdElectronic
$198 $3,000 1.02 15.1
26 d Upgrade Controls Install DDC control system
to control temp setbacks,
outside air, and motor run
time
$23,345 $367,540 1.27 15.74
27 Lighting:
Wrestling/Raquetba
ll Court/Wt Room
Replace with 12 FLUOR (6)
T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
and Add new Occupancy
Sensor, Multi-Level Switch
$777 $12,300 0.97 15.8
28 HVAC And DHW Cleaver Brooks Boilers
Upgrades
$5,785 $120,000 0.93 20.7
29 Exterior Door:
Exterior Door:
solid door
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$81 $2,640 0.82 32.7
30 Lighting:
Wrestling/Raquetba
ll Court/Wt Room
Replace with 14 FLUOR (3)
T5 45.2" F28T5 28W
Standard StdElectronic and
Add new Occupancy Sensor
$418 $10,150 0.63 24.3
31 Exterior Door:
Exterior Door: half
window
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$177 $7,920 0.60 44.7
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
32 Window/Skylight:
School Window:
double pane, 1/2"
gap air - Not South
Replace existing window
with U-0.30 vinyl window
$992 $40,869 0.47 41.2
33 Window/Skylight:
Old Shop - Not
South
Replace existing window
with U-0.30 vinyl window
$20 $808 0.47 41.4
34 Window/Skylight:
New Shop
Windows -Not
South
Replace existing window
with U-0.30 vinyl window
$18 $739 0.46 41.8
35 Window/Skylight:
New Shop
Windows - South
Replace existing window
with U-0.30 vinyl window
$52 $2,217 0.45 42.6
36 Window/Skylight:
School Window:
double pane, 1/2"
gap air-South
Replace existing window
with U-0.30 vinyl window
$657 $28,585 0.44 43.5
37 Garage Door:
Garage - School
Replace existing garage door
with R-7, 2" polyurethane
core replacement door.
$58 $5,207 0.30 89.8
38 Lighting:
Utility/Low Use
Space
Replace with FLUOR CFL,
A Lamp 20W
$2 $50 0.27 23.5
39 Lighting:
Auditorium
Replace with 78 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$45 $7,800 0.09 173.2
TOTAL $37,800 $235,396 2.31 6.2
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.
b This item is intended to be implemented once the existing instant start ballasts fail and require replacement, negating the cost of
installing new ballasts.
c This item is intended to be implemented as HVAC pumps burn out and require replacement. This is the cost difference between
standard efficient motors and high efficiency Electronically Commutated Motors for all HVAC pumps.
d ECM item was modeled with separate AkWarm model and as a result, the item is not an additive measure and is not included in
the final totals.
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
ENERGY AUDIT REPORT – ENERGY EFFICIENT RECOMMENDATIONS
1. Building Envelope
Insulation
Rank Location Existing Type/R-Value Recommendation Type/R-
Value
Installed
Cost
Annual
Energy
Savings
Exterior Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
29 Exterior Door:
Exterior Door:
solid door
Door Type: Metal -
urethane, no therm. break
Modeled R-Value: 2.5
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$2,640 $81
31 Exterior Door:
Exterior Door:
half window
Door Type: Metal - EPS
insulation; half-lite
Modeled R-Value: 3
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$7,920 $177
37 Garage Door:
Garage - School
Door Type: Thermacore
190 - Overhead Door
Insulating Blanket: None
Modeled R-Value: 5.3
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$5,207 $58
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
32 Window/Skylig
ht: School
Window: double
pane, 1/2" gap
air - Not South
Glass: Double, glass
Frame: Aluminum, No
Thermal Break
Spacing Between Layers:
Half Inch
Gas Fill Type: Air
Modeled U-Value: 0.81
Solar Heat Gain
Coefficient: 0.46
Replace existing window
with U-0.30 vinyl
window
$40,869 $992
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
33 Window/Skylig
ht: Old Shop -
Not South
Glass: Double, glass
Frame: Aluminum, No
Thermal Break
Spacing Between Layers:
Half Inch
Gas Fill Type: Air
Modeled U-Value: 0.81
Solar Heat Gain
Coefficient: 0.46
Replace existing window
with U-0.30 vinyl
window
$808 $20
34 Window/Skylig
ht: New Shop
Windows -Not
South
Glass: Double, glass
Frame: Aluminum, No
Thermal Break
Spacing Between Layers:
Half Inch
Gas Fill Type: Air
Modeled U-Value: 0.81
Solar Heat Gain
Coefficient: 0.46
Replace existing window
with U-0.30 vinyl
window
$739 $18
35 Window/Skylig
ht: New Shop
Windows -
South
Glass: Double, glass
Frame: Aluminum, No
Thermal Break
Spacing Between Layers:
Half Inch
Gas Fill Type: Air
Modeled U-Value: 0.81
Solar Heat Gain
Coefficient: 0.46
Replace existing window
with U-0.30 vinyl
window
$2,217 $52
36 Window/Skylig
ht: School
Window: double
pane, 1/2" gap
air-South
Glass: Double, glass
Frame: Aluminum, No
Thermal Break
Spacing Between Layers:
Half Inch
Gas Fill Type: Air
Modeled U-Value: 0.81
Solar Heat Gain
Coefficient: 0.46
Replace existing window
with U-0.30 vinyl
window
$28,585 $657
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Air Leakage
Rank Location Estimated Air Leakage Recommended Air
Leakage Target
Installed
Cost
Annual
Energy
Savings
17 Air Tightness estimated as:
175000 cfm at 50 Pascals
Perform air sealing to
reduce air leakage by
10%.
$20,000 $4,243
2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
28 Cleaver Brooks Boilers Upgrades $120,000 $5,785
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
Ventilation
Rank Recommendation Cost Annual
Energy
Savings
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
2 Restroom/Locker
Room
4 FLUOR T8 4' F32T8
32W Standard Instant
StdElectronic with
Manual Switching
Replace with 4 FLUOR
T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$2 $9
3 Class/Heavy Use
Office
111 FLUOR (2) T8 4'
F32T8 32W Standard
Instant StdElectronic with
Manual Switching
Replace with 111
FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic and Add
new Occupancy Sensor
$2,401 $1,429
4 Lightly Used
Office Space
8 FLUOR (3) T8 4' F32T8
32W Standard Instant
StdElectronic with
Manual Switching
Replace with 8 FLUOR
(3) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$151 $70
5 Lightly Used
Office Space
6 INCAN A Lamp, Std
100W with Manual
Switching
Add new Occupancy
Sensor
$150 $65
6 Exterior Lighting 3 HPS 400 Watt Magnetic
with Clock Timer or
Other Scheduling Control,
On/Off Photoswitch
Replace with 3 LED
150W Module
StdElectronic
$1,650 $441
7 Lightly Used
Office Space
10 FLUOR (4) T8 4'
F32T8 32W Standard
Instant StdElectronic with
Manual Switching
Replace with 10 FLUOR
(4) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$451 $116
8 Corridor/Library/
Cafeteria
8 MV 250 Watt Magnetic
with Manual Switching
Replace with 8 FLUOR
(2) T5 45.2" F54W/T5
HO Standard
StdElectronic
$4,000 $1,016
9 Lightly Used
Office Space
44 FLUOR (2) T8 4'
F32T8 32W Standard
Instant StdElectronic with
Manual Switching
Replace with 44 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$1,051 $262
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
11 Restroom/Locker
Room
16 INCAN A Lamp, Std
100W with Manual
Switching
Replace with 16 FLUOR
CFL, A Lamp 20W and
Add new Occupancy
Sensor
$1,850 $474
12 Corridor/Library/
Cafeteria
21 FLUOR (6) T8 4'
F32T8 32W Standard
Instant StdElectronic with
Manual Switching
Replace with 21 FLUOR
(3) T8 4' F32T8 32W
Standard Instant
StdElectronic
$3,675 $705
13 Class/Heavy Use
Office
157 FLUOR (3) T8 4'
F32T8 32W Standard
Instant StdElectronic with
Manual Switching
Replace with 157
FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic and Add
new Occupancy Sensor
$24,900 $4,044
14 Gym 24 MH 400 Watt
StdElectronic with
Manual Switching
Replace with 24 FLUOR
(6) T5 45.2" F54W/T5
HO Standard (2)
StdElectronic and Add
new Occupancy Sensor,
Multi-Level Switch
$23,300 $3,541
15 Corridor/Library/
Cafeteria
4 MV 175 Watt Magnetic
with Manual Switching
Replace with 4 FLUOR
(2) T5 45.2" F54W/T5
HO Standard
StdElectronic
$2,000 $307
16 Exterior Lighting HPS 250 Watt Magnetic
with Clock Timer or
Other Scheduling Control,
On/Off Photoswitch
Replace with LED 115W
Module StdElectronic
$550 $82
18 Class/Heavy Use
Office
51 FLUOR (4) T8 4'
F32T8 32W Standard
Instant StdElectronic with
Manual Switching
Replace with 51 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$1,951 $219
19 Restroom/Locker
Room
64 FLUOR (2) T8 4'
F32T8 32W Standard
Instant StdElectronic with
Manual Switching
Replace with 64 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$2,701 $279
20 Natatorium 28 MH 400 Watt
StdElectronic with
Manual Switching
Replace with 28 FLUOR
(6) T5 45.2" F54W/T5
HO Standard
StdElectronic and
Improve Manual
Switching
$28,001 $2,833
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
21 Exterior Lighting 13 HPS 150 Watt
Magnetic with Clock
Timer or Other
Scheduling Control,
On/Off Photoswitch
Replace with 13 LED
80W Module
StdElectronic
$6,500 $591
22 Corridor/Library/
Cafeteria
70 FLUOR (3) T8 4'
F32T8 32W Standard
Instant StdElectronic with
Manual Switching
Replace with 70 FLUOR
(2) T8 4' F32T8 32W
Standard Instant
StdElectronic
$10,500 $783
23 Lightly Used
Office Space
6 INCAN A Lamp, Std
100W with Manual
Switching
Replace with 6 FLUOR
CFL, A Lamp 20W
$300 $52
24 Exterior Lighting 16 HPS 400 Watt
Magnetic with Clock
Timer or Other
Scheduling Control,
On/Off Photoswitch
Replace with 16 LED
150W Module
StdElectronic
$33,000 $2,349
25 Exterior Lighting 7 HPS 100 Watt
StdElectronic with Clock
Timer or Other
Scheduling Control,
On/Off Photoswitch
Replace with 7 LED 50W
Module StdElectronic
$3,000 $198
27 Wrestling/Raquet
ball Court/Wt
Room
12 MH 400 Watt
StdElectronic with
Manual Switching
Replace with 12 FLUOR
(6) T5 45.2" F54W/T5
HO Standard (2)
StdElectronic and Add
new Occupancy Sensor,
Multi-Level Switch
$12,300 $777
30 Wrestling/Raquet
ball Court/Wt
Room
14 MV 175 Watt
StdElectronic with
Manual Switching
Replace with 14 FLUOR
(3) T5 45.2" F28T5 28W
Standard StdElectronic
and Add new Occupancy
Sensor
$10,150 $418
38 Utility/Low Use
Space
INCAN A Lamp, Std
100W with Manual
Switching
Replace with FLUOR
CFL, A Lamp 20W
$50 $2
39 Auditorium 78 FLUOR (2) T12 4'
F40T12 34W Energy-
Saver Magnetic with
Manual Switching
Replace with 78 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$7,800 $45
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Refrigeration
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
Other Electrical Equipment
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
Cooking/Clothes Drying
Rank Recommended Installed
Cost
Annual
Energy
Savings
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
Appendix E
Site Visit Photos
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
1. Main Entrance 2. Pool Entrance
3. Boiler Room 4. Mechanical Penthouse
5. New Shop 6. Old Shop
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
7. New Shop Boiler Room 8. New Shop Indirect Water Heater
9. School S-1 and R-1 10. School E-1 and S-4
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
11. School Emergency Generator 12. Heating Water Heat Exchanger
13. Generator Day Tank 14. School Fan S-3
15. School Fan S-2 16. Heating Water Circulation Pumps
Seward High School Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CAC-SWD-CAEC-01
17. Gymnasium 18. Wrestling Room
19. New Shop Fuel Oil Tank 20. School Fuel Oil Tank
End of Report