HomeMy WebLinkAboutCIRI-TKA-CAEC Trapper Creek Elementary School 2012-EEENERGY AUDIT FINAL REPORT
Trapper Creek Elementary School
Mile 2.5 Petersville Road
Trapper Creek, AK 99683
p (907) 376-0806
AkWarm ID No. CIRI-TKA-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
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 i AkWarm No. CIRI-TKA-CAEC-01
Contents
I. Executive Summary .................................................................................................................. 1
II. Introduction .............................................................................................................................. 4
III. Energy Audit Process ............................................................................................................. 5
IV. Method of Analysis ................................................................................................................. 6
V. Building Description ................................................................................................................ 7
V.I ARCHITECTURAL DESCRIPTION ............................................................................................................................ 7
V.II MECHANICAL DESCRIPTION ............................................................................................................................... 7
V.III ELECTRICAL DESCRIPTION ................................................................................................................................ 8
V.IV OUTBUILDINGS DESCRIPTION............................................................................................................................ 9
VI. Historic Energy Consumption and Cost............................................................................. 10
VI.I ELECTRICAL CONSUMPTION DATA ................................................................................................................... 10
VI.II FUEL OIL 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 TRACTOR STORAGE SHED (TSS) ENERGY CONSERVATION MEASURES ........................................................ 16
VIII.III OFFICE SUPPLY STORAGE TRAILER (OSST) ENERGY CONSERVATION MEASURES ..................................... 17
VIII.IV ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION ....................................... 18
Appendices
Appendix A – Energy Benchmark Data
Appendix B – AkWarm Commercial Reports
Appendix C – Major Equipment List
Appendix D – School Energy Conservation Measures
Appendix E – Tractor Storage Shed Energy Conservation Measures
Appendix F – Office Supply Storage Trailer Energy Conservation Measures
Appendix G – Site Survey Photos
Appendix H – Thermographic 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 Trapper Creek 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
Matanuska-Susitna Borough School
District
Contact: Rick Jensen
501 N Gulkana St
Palmer, AK 99645
Email: ricky.jensen@matsuk12.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 January 2009-December 2010 documented annual utility costs at this facility are as follows:
Electricity $21,997
Fuel Oil #2 $27,829
Total $49,826
January 2009-December 2010 Energy Utilization Index (EUI) = 102.6 kBtu/sf
January 2009-December 2010 Energy Cost Index = 2.70 $/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. See section VIII for detailed descriptions of all cost effective ECMs.
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Executive Summary – Recommended ECMs
Trapper Creek Elementary School (TCES)
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
TCES-0a Refrigerators Replace residential & light
commercial
refrigerators/freezers older
than 5 years old
-- - <10
TCES -1 Lighting:
Classrooms
and Library
Install new Occupancy
Sensors, Replace
Incandescent Lamps, and
Remove Un-needed Light
Fixtures
$337 $1,150 4.19 3.4
TCES -2 Lighting:
Corridors
Improve Manual
Switching, and Replace the
HPS Canopy Lights in the
Vestibules with LED Light
Fixtures
$380 $1,700 3.26 4.5
TCES -3 Lighting:
Storage,
Custodian,
and
Mechanical
Rooms
Re-wire Nightlights in
Boiler Room to Switch
With Local Lighting
Circuit. Add New
Occupancy Sensors to
Storage and Custodian
Rooms. Replace T12 Light
Fixtures with T8 Light
Fixtures. Replace
Incandescent Lamps with
Compact Fluorescent
Lamps.
$148 $770 2.75 5.2
TCES -4 Setback
Thermostat:
School
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the School.
$4,865 $28,000 2.36 5.8
TCES -5 Lighting:
Gym
Replace with FLUOR (6)
T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
and Add new Occupancy
Sensors, and Remove
Nightlights.
$1,474 $13,400 1.61 9.1
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Executive Summary – Recommended ECMs
Trapper Creek Elementary School (TCES)
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
TCES -6 Lighting:
Offices
Add new Occupancy
Sensors
$43 $450 1.38 10.5
TCES -7 b HVAC And
DHW
Install EC motors on
Pumps P-1, P-1A, P-2, P-4,
and P-5
$600 $5,764 1.21 9.6
TCES -8 Lighting:
Restroom
Add new Occupancy
Sensors
$56 $750 1.09 13.4
TCES -9 Air
Tightening
Perform air sealing to
reduce air leakage by 20%.
$1,953 $18,000 1.01 9.2
TCES -10 Lighting:
Exterior
Lighting
Replace all Exterior HPS
Light Fixtures with LED
Light Fixtures
$1,065 $15,600 1.00 14.6
Notes:
a Due to advances in refrigerators in the previous 5 years, new Energy Star refrigerators are much more efficient and
result in viable energy savings.
b This ECM 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 the pumps.
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II. Introduction
This energy audit was conducted at Trapper Creek Elementary School (TCES) for AHFC and the
Matanuska-Susitna Borough School District. The school is an 18,441 square foot (sf) campus that
includes a 17,757 sf school, a 144 sf tractor storage shed, and a 540 sf storage trailer. The school building
consists of classrooms, restrooms, administrative offices, a library, and a gymnasium. 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.
Trapper Creek – Google Earth
Trapper Creek 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 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 to conduct a site survey.
A site survey was completed on November 28, 2011. The audit included inspecting the building systems
that impact energy consumption and answering questions from the preliminary review of the school. The
on-site contact during the investigation was Mr. Rick Jensen of the MSBSD Maintenance Department1.
The following information was also collected while on site: occupancy schedules, O&M practices,
building energy management program, and other information that has an impact on energy consumption.
The following energy audit includes an evaluation of the information gathered, the researching of possible
conservation opportunities, organizing the energy audit into a comprehensive report, and making ECM
recommendations for mechanical, electrical, and building envelope improvements.
1 Mr. Rick Jensen, (907) 354-0348 (mobile), (907) 864-2007 (office)
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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, 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
Trapper Creek Elementary School, originally constructed in 1986, is a single story building with two
heated storage buildings. The school is regularly occupied by approximately 34 people, Monday through
Friday, from 7 am to 4 pm during the school year with afterschool activities lasting until 8 pm. The school
year starts in August and ends in May.
V.I Architectural Description
Wall, floor, and roof construction details were obtained from the architectural drawings. The above grade
walls of the Trapper Creek Elementary School are constructed of 2x8 studs on 24 inch (”) centers with
6.75” thick fiberglass batt insulation, plywood sheathing, building paper, and metal siding on the exterior
walls for a composite R-value of R-25.9. Below grade foundation walls are constructed of 8” CMU
blocks with the exterior face covered by 2” of rigid insulation extending 2’ below grade. The composite
R-value for this wall type is R-19. There is a total of 7,830 sf of total wall area.
The 16,127 sf main floor consists of 4” thick concrete slab-on-grade construction. The perimeter floor
edges are insulated with 2” rigid insulation having an effective R-value of R-14.7. The insulation is
located on the exterior face of the foundation walls and is buried to a depth of 2 feet (’). The total square
footage of the school, 17,757 sf, includes a 1,073 sf fan room above the bathrooms and a 557 sf fan room
above the kitchen.
The roof construction for the school consists of an aluminum roof, one layer of R-38 batt insulation, one
layer of R-19 batt insulation, and wood decking over gabled roof framing. While the roof insulation could
not be accessed to verify these components, it was estimated that the composite R-value for the roof
system is R-59.5. A roof construction project in 1985 extended the ends of the roof and installed a
hydronic roof melt system at the ends of the roof. There is 22,242 sf of roofing on the school building.
Typical window construction consists of double paned glass, ½” air space, with wood frames. Both fixed
windows and operable windows were observed. An insulating value of R-2.0 was estimated for the
classroom windows. The vestibule areas of the school have 3’x7’ glass panels on either side of the doors
with an estimated insulating value of R-1.6. There is a total of 598 sf of window area, with 100 sf of south
facing window area.
The school has two different types of insulated exterior doors. There are 15 solid metal doors and 5 metal
doors with quarter-light glass, each with an estimated R-value of R-2.5 and R-2.2, respectively. There is a
total of 420 sf of door area.
V.II Mechanical Description
The school building is heated with two oil-fired Burnham V904A boilers, each with an input of 4.2
gallons per hour (GPH). Each boiler is equipped with a Beckett S56GYLDM-6017 CF200 burner and a
firing rate of 4.2 GPH. The boilers are connected to a boiler loop that delivers heat to the school, to the
roof’s snow melt system, and to a glycol heating loop for the fire water system. Within the school, the
boiler loop connects to the fin tubes, unit heaters, and hydronic coils in the supply air fans. For the fire
water system, water from the boiler is passed through heat exchanger HX-2 to prevent the cold water
supply lines from the buried 10,000 gallon fire suppression system from freezing during the winter. Fuel
oil is stored outside in a buried 5,000 gallon storage tank and a 500 gallon above grade storage tank. The
above ground storage tank provides fuel oil to the electric generator while the buried tank provides fuel
oil to the heating equipment. A day tank is located inside the boiler room. The boilers are 2 years old and
appear to be well maintained.
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There are eight fans in the school that provide tempered ventilation air to the classrooms, the offices, the
gym, the boiler room, and the kitchen. Fan F-1 serves the classrooms, fans F-2 through F-4 serve the gym,
and fan F-6 serves the main corridor and the office spaces. All fans utilize hydronic heating coils to heat
the supply air. The fan serving the kitchen, F-12, is a dedicated make-up air unit. In the boiler room, a
combustion air fan, F-7, is provided. A detailed list of all fans within the school is provided in Appendix
C.
The domestic hot water for the building is supplied by an oil-fired PVI 3.8-N-250-A-O water heater with
a storage capacity of 250 gallons and an input of 3.8 GPH. The water heater is equipped with a Beckett
burner with a firing rate of 3.8 GPH. The domestic hot water is recirculated through the building using a
Grundfos UP 15-42 SF pump.
The ventilation fans are controlled by a Direct Digital Control (DDC) management system while the
remainder of the school is controlled with pneumatic controls. The pneumatic thermostats control the
heating systems within the building.
V.III Electrical Description
The school is served by an 800 Amp (A), 120/240 Volt (V), single-phase, 3-wire, underground electrical
service connected to a pad-mounted utility transformer. The school has a standby diesel generator used to
power selected loads in the event of a power outage. A roto-phase and dry-type transformer is used to
convert the single-phase electricity to three phase electricity to power the kitchens refrigeration
compressor and the supply fan F-1. This transformer was manufactured prior to the passage of the Energy
Policy Act of 2005 requiring all general purpose transformers to meet the efficiency requirements listed in
the National Electrical Manufacturer's Association publication NEMA TP1-2002. There are energy
savings available by replacing these transformers with new models that meet or exceed the standard,
however caution must be exercised because replacing transformers impacts available fault current and
over-current protection device selective coordination. The replacement of these transformers could only
be recommended after performing a power system analysis. That level of study is outside the scope of this
project.
The lighting levels throughout the school were observed to be adequate and within the suggested lighting
levels from the Illumination Engineering Society of North America (IESNA). Most fluorescent light
fixtures in the school utilize T8 lamps and electronic ballasts. The only T12 light fixture is located in a
mechanical fan room. All of the fluorescent light fixtures are controlled by wall switches with the
exception of a few fluorescent nightlights (un-switched light fixtures) present in the corridors and the
boiler room.
Incandescent lights are present in small numbers scattered throughout the school, but are primarily used in
the mechanical rooms. High pressure sodium lamps are present in the school vestibules and are switched
with the corridor lights.
The gymnasium is illuminated with several 400 watt (W) high bay metal halide light fixtures. The gym is
split into two zones; each zone is controlled by two switches that provide bi-level lighting by switching
every other light fixture. Two nightlights are present in the gymnasium.
Exterior lighting consists of 70W high pressure sodium (HPS) canopy lights, 150W pole mounted
walkway lights and 400W pole mounted parking lot lights. All of the exterior lights are controlled by an
on-off photo sensor to switch the light fixtures off during the day.
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Other electricity-using equipment not previously described in the mechanical or electrical sections include
a microwave, a walk in refrigerator and freezer unit, other various kitchen equipment, and various user
equipment such as projectors, computers, and printers.
V.IV Outbuildings Description
The school campus includes two heated storage units, a small 144 sf storage shed and a larger 540sf
storage trailer, that are heated year round by an electric unit heater. Neither of the storage units are
regularly occupied spaces, but are utilized as needed for equipment and supply storage. A separate
AkWarm model was created for each storage unit. The recommended ECMs for the small storage shed
are located in Appendix E and the ECMs for the storage trailer are located in Appendix F.
The storage shed that houses a small tractor is 12’ x 12’, with wall construction consisting of 2x6 walls,
8’ in height, with R-19 batt insulation and wood siding for a composite R-value of R-16.7. The floor
consists of plywood sheathing on 4x6 floor joists with no insulation for an R-value of R-5.8. The roof
construction consists of roofing shingles, plywood sheathing, and 2x8 framing with a layer of R-25 batt
insulation for an estimated insulating value of R-26.3. The only door to the shed is a 6’x 7’ wood paneled
garage door with an estimated R-value of R-2.6. The shed is heated by a King Pic-A-Watt electrical unit
heater, with the thermostat on the unit heater set to 65°F. The space is provided an electrical service from
the adjacent school building to power the unit heater, convenience receptacles, and two incandescent light
fixtures.
The remaining storage trailer is a 45’ x 12’ office supply storage trailer, with wall construction consisting
of 2x4 walls on 16” centers with R-11 batt insulation for a composite R-value of R-11.4. The floor
consists of 2x6 floor joists with 3.5” thick batt insulation for a composite R-value of R-15.5. The storage
trailer is placed on timbers to be elevated off of the ground. Roof construction for the trailer consists of
2x6 framing at 16” centers with 5.5” batt insulation, plywood sheathing, and roofing shingles. There are
two metal, insulated doors to the trailer, each with an R-value of R-2.5 and a total area of 42 sf. Windows
within the trailer are fixed and the construction consists of 1” airspace, double pane glass with metal
frames for a composite R-value of R-1.2. There is a total of 32 sf of window area. The trailer is heated by
a King Pic-A-Watt electrical unit heater. An underground electric service is routed from the school to a
small distribution panel in the trailer to distribute power to the electric loads including the unit heater,
receptacles and eight two lamp T12 fluorescent light fixtures controlled by a wall mounted rocker switch.
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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 December 2008 to December 2010. Matanuska Electric
Association provides the electricity and Marathon Oil Company provides the fuel oil to the building. Both
utility companies bill the facility using a commercial rate schedule. The actual utility bills were not
provided to be able to verify the data received to assure 100 percent accuracy of the data.
The AkWarm model of the facility was built to match the facility’s average annual electric and heating oil
consumption, so that a realistic model could be created. The monthly energy consumption of the
AkWarm model matches the actual average monthly consumption of the facility within 25%, which is
adequate for this level of modeling. Overall, the energy consumption trends of the AkWarm model and
the actual facility match appropriately. Graphical representations of the monthly energy consumption are
included in Appendix A.
VI.I Electrical Consumption Data
The electric utility costs consist of several components: a fixed monthly customer charge, an energy usage
charge, fuel surcharge, taxes, and a demand charge. The energy usage and fuel surcharge are based on the
customer's usage as measured in kilowatt-hours (kWh). The usage (kWh) is determined by load wattage
divided by 1,000, times hours running. For example, a 1,000 watt load operating for one hour will use 1
kWh of electricity as would ten, 100 watt lamps operating for one hour or one, 100W lamp operating for
10 hours. One kWh is equivalent to 3,413 BTU. Utility data used in this report reflects the historical data
provided for the building in a summarized format.
VI.II Fuel Oil Consumption Data
The fuel oil company delivers fuel monthly to fill the tanks and charges for gallons delivered. 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 BTUs.
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 $0.14/kWh $0.12 /kWh $0.13 /kWh
#2 Fuel Oil $2.67 /Gal $2.93 /Gal $2.80 /Gal
Total Cost $53,901 $45,751 $49,826
ECI $2.92 /sf $2.48 /sf $2.70 /sf
Electric EUI 31.6 kBTU/sf 31.9 kBTU /sf 31.7 kBTU /sf
#2 Fuel Oil EUI 79.2 kBTU /sf 62.6 kBTU /sf 70.9 kBTU /sf
Building EUI 110.8 kBTU /sf 94.4 kBTU /sf 102.6 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 18,441 sf. This area includes the 17,757 sf
school, including the 1,073 sf fan room above the bathrooms and the 557 sf fan room above the kitchen,
the 144 sf tractor storage shed, and the 540 sf storage trailer.
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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 G.
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VIII. Energy Conservation Measures
VIII.I School Energy Conservation Measures
ECM# TCES-0 – Replace Residential & Light Commercial Refrigerators/Freezers Older than 5
Years Old
Annual Energy Savings Installed Cost SIR Payback (years)
- - - <10 years
Due to advances in refrigerators in the previous five years, new Energy Star residential-type and light
commercial-type refrigerators and freezers are much more efficient and result in viable energy savings.
Built-in refrigerators and freezers should be evaluated independently. Replacing existing refrigerators,
which are older than five years old, with new energy star models will typically have paybacks of less than
10 years.
ECM# TCES-1 – Upgrade Lighting in the Classrooms and Library
Annual Energy Savings Installed Cost SIR Payback (years)
$337 $1,150 4.19 3.4
The classrooms and library are illuminated by approximately (65) 4' 3-lamp T8 light fixtures with
electronic ballasts. Additionally, there are two incandescent can lights in the pre-school classroom that are
switched with the same circuit as the adjacent corridor lights. It is recommended that approximately nine
ceiling mounted occupancy sensors be installed to control the lighting in the classrooms and library, and
that the two incandescent can lights be demolished. Additionally there is an incandescent desk lamp that
should be re-lamped with a compact fluorescent lamp (CFL)
This description compiles measures 6, 9, 11, 12, 21 and 22 which were individually modeled in
AKWarm. SIR's for measures 21 and 22 were less than one, but were included since consistent upgrades
should be done concurrently. See appendix D for details of individual measures.
ECM # TCES -2–Upgrade Lighting in the Corridors and Vestibules
Annual Energy Savings Installed Cost SIR Payback (years)
$380 $1,700 3.26 4.5
The corridors in the school building are illuminated with several T8 light fixtures; approximately (4) 4' 3-
lamp fixtures, and (1) 4' 4-lamp and of these fixtures are being used as nightlights. It is recommended that
these night lights are re-wired to switch with the local lighting circuit. Although not included in the ECM,
the District may also consider upgrading the light fixtures with battery backed ballasts to provide a small
level of lighting during power outages.
The vestibule areas are currently illuminated by four 70W HPS canopy light fixtures that are controlled
by the same switch as the corridor lighting. It is recommended that these fixtures be replaced with light
emitting diode (LED) light fixtures with a power consumption of approximately 35W. Additional saving
will be realized if the light fixtures are provided with integral occupancy sensors, however this feature
was not modeled or included in the installed cost.
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This description compiles measures 1, 3, and 23 which were individually modeled in AKWarm. The SIR
for measure 23 was less than one, but was included since consistent upgrades should be done
concurrently. See appendix D for details of individual measures.
ECM # TCES -3 – Upgrade Lighting in the School's Storage, Custodian, and Mechanical Rooms
Annual Energy Savings Installed Cost SIR Payback (years)
$148 $770 2.75 5.2
There are (2) 4' 2-lamp T8 fluorescent strip light fixtures that are currently being used as night lights in
the boiler room and are never switched. These lights should be re-wired to be controlled by the local
lighting circuit. Additionally the four incandescent lamps used in the mechanical rooms should be
replaced with compact fluorescent lamps (CFL's), and the fluorescent T12 light fixture in the fan room
should be replaced with a 4' 2-lamp T8 light fixture. Wall mounted occupancy sensors should be installed
in the storage and custodian closets to control the lighting, however it is not recommended to provide
occupancy sensors in the mechanical rooms.
This description compiles measures 2, 24, 30, 32, and 35 which were individually modeled in AKWarm.
SIR's for measures 24, 30, 32, and 35 were less than one, but were included since consistent upgrades
should be done concurrently. See appendix D for details of individual measures.
ECM# TCES - 4 – Setback Thermostat for School
Annual Energy Savings Installed Cost SIR Payback (years)
$4,865 $28,000 2.36 5.8
Significant energy savings exist by reducing the room temperatures in the school during unoccupied
times. By reducing the temperature of these spaces to 60°F during unoccupied times, the heating load
required will be reduced. The cost of this ECM includes the cost of replacing 14 existing thermostats with
new programmable thermostats, installing 14 electronic to pneumatic transducers, and connecting the
transducers to the existing DDC system at a cost of $2,000 per thermostat. A DDC contractor will need to
evaluate the existing DDC system to determine if infrastructure improvements are necessary to make the
afore mentioned ECM viable. See items 4, 8, and 13 in Appendix D for more information.
ECM# TCES - 5 - Upgrade Gym Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$1,474 $13,400 1.61 9.1
The gymnasium is illuminated by approximately (16) 400W metal halide light fixtures. Two of these light
fixtures are used as night lights. The major drawback of metal halide light fixtures are that they take
several minutes to turn on making it inconvenient to switch the light on and off as needed. It is
recommended that these light fixtures be replaced one-for-one with 6-lamp T5HO light fixtures and that
the two existing nightlights be re-wired to switch with the local lighting circuit and replaced with light
fixtures with battery backed ballasts to provide illumination in the event of a power outage. Because of
the quicker re-strike time of the fluorescent lights it is recommended that the T5HO light fixtures are
controlled by four wall mounted occupancy sensors with wire guards to prevent the room from being
illuminated while un-occupied for extended periods of time.
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This description compiles measures 5 and 18 which were individually modeled in AKWarm. The SIR for
measure 18 was less than one, but was included since consistent upgrades should be done concurrently.
See appendix D for details of individual measures.
ECM # TCES - 6 – Upgrade Office Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$43 $450 1.38 10.5
The office spaces in the school are primarily lit by T8 light fixtures and electronic ballasts. It is
recommended that occupancy sensors be added to all of the office areas with the exception of the main
office, due to the difficulty in detecting motion throughout the office. One wall mounted occupancy
sensor should be provided in each of the following office areas: the nurse's office, the teachers' lounge,
and the custodian's office.
This description compiles measures 7, 28, and 29 which were individually modeled in AKWarm. SIR's
for measures 28 and 29 were less than one, but were included since consistent upgrades should be done
concurrently. See appendix D for details of individual measures.
ECM # TCES - 7 – Repair Burnout Motors with EC motors On Pumps P-1, P-1A, P-2, P-4, and P-5
Annual Energy Savings Installed Cost SIR Payback (years)
$600 $5,764 1.21 9.6
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 $12,874 replacement cost with an annual energy savings of $600, with a simple
payback of 23.4 years. 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 $5,764 repair cost, since
the motor needs to be replaced anyway. See item 14 in Appendix D for more information.
ECM # TCES - 8 - Upgrade Restroom Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$56 $750 1.09 13.4
The school's restrooms are primarily illuminated by T8 light fixtures and electronic ballasts. All of these
lights are currently controlled by a wall mounted light switch located in each room. It is recommended
that a ceiling mounted occupancy sensor be used to control all of the light fixtures in the school's
restrooms.
This description compiles measures 10, 27, and 34 which were individually modeled in AKWarm. SIR's
for measures 27 and 34 were less than one, but were included since consistent upgrades should be done
concurrently. See appendix D for details of individual measures.
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ECM # TCES - 9 – Perform Air Sealing to Reduce Air Leakage by 20%
Annual Energy Savings Installed Cost SIR Payback (years)
$1,953 $18,000 1.01 9.2
By tightening the building envelope with air sealing improvements, infiltration into the building will be
reduced. This in turn will reduce the heating load required by the building and reduce the amount of fuel
oil being burned by the boilers. While a blower door test was not completed, it is anticipated that air
leakage is occurring though old weather stripping around doors, window frames, and wall and roof
penetrations. Methods to decrease the infiltration into the building include: sealing around the windows
and doors with caulking and insulation, adding new weather stripping to doors, providing gaskets to all
exterior cover plates and sealing all roof and wall penetrations. To achieve a viable economic benefit, up
to $18,000 can be invested and still achieve an SIR ≥ 1by reducing air leakage by 20%. See item 17 in
Appendix D for more information.
ECM # TCES - 10 – Upgrade Exterior Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$1,065 $15,600 1.00 14.6
Exterior lighting consists of seven 70W HPS canopy lights, four 150W HPS pole mounted walkway
lights and four 400W HPS pole mounted parking lot lights. These lights are currently controlled by an
on/off photo switch that turns the lights off during the day. It is recommended that the HPS light fixtures
are replaced with LED light fixtures to reduce energy consumption. Further benefits of LED light fixtures
include longer source life and better color rendering. Additionally the new LED light fixtures may be
provided with integral motion sensors to illuminate the exterior areas at a low stand-by setting, and
increase the lighting level once motion has been detected.
This description compiles measures 15, 16, and 19 which were individually modeled in AKWarm. See
appendix D for details of individual measures.
VIII.II Tractor Storage Shed (TSS) Energy Conservation Measures
ECM# TSS-1 – Turn Down Thermostat
Annual Energy Savings Installed Cost SIR Payback (years)
$296 $1 - 0
Significant energy savings exist by reducing the room temperature of the unoccupied storage shed. By
reducing the temperature of the space to 55°F, the heating load required by the space will be reduced. The
cost assigned to this ECM includes the cost of the building operations staff lowering the unit heater
thermostat from 65°F to 55°F. See item 1 in Appendix E for more information.
ECM# TSS-2 – Perform Air Sealing to Reduce Air Leakage by 20%
Annual Energy Savings Installed Cost SIR Payback (years)
$54 $450 1.05 8.3
By tightening the building envelope with air sealing improvements, infiltration into the building will be
reduced. This in turn will reduce the heating load required by the building and reduce the amount of
electricity being used by the unit heater. While a blower door test was not completed, it is anticipated that
air leakage is occurring though old weather stripping on the overhead door, spaces between the batt
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insulation in the roof, and wall penetrations. Methods to decrease the infiltration into the building include:
sealing around the doors with caulking and insulation, adding new weather stripping to the door,
providing gaskets to all exterior cover plates and sealing all roof and wall penetrations. To achieve a
viable economic benefit, $450 can be invested and still achieve an SIR ≥ 1by reducing air leakage by
20%. See item 2 in Appendix E for more information.
VIII.III Office Supply Storage Trailer (OSST) Energy Conservation Measures
ECM# OSST-1 – Turn Down Thermostat
Annual Energy Savings Installed Cost SIR Payback (years)
$1,129 $1 - 0
Significant energy savings exist by reducing the room temperature of the unoccupied office supply
storage trailer. By reducing the temperature of the space to 55°F, the heating load required by the space
will be reduced. The cost assigned to this ECM includes the cost of the building operations staff lowering
the unit heater thermostat from 65°F to 55°F. See item 1 in Appendix F for more information.
ECM# OSST -2 – Perform Air Sealing to Reduce Air Leakage by 20%
Annual Energy Savings Installed Cost SIR Payback (years)
$226 $1,500 1.31 6.7
By tightening the storage trailer envelope with air sealing improvements, infiltration into the building will
be reduced. This in turn will reduce the heating load required by the building and reduce the amount of
electricity being used by the unit heater. While a blower door test was not completed, it is anticipated that
air leakage is occurring though old weather stripping around doors, window frames, and wall, roof, and
floor penetrations. Methods to decrease the infiltration into the building include: sealing around the
windows and doors with caulking and insulation, adding new weather stripping to doors, providing
gaskets to all exterior cover plates and sealing all roof, wall, and floor penetrations. To achieve a viable
economic benefit, $1,500 can be invested and still achieve an SIR ≥ 1by reducing air leakage by 20%. See
item 2 in Appendix F for more information.
ECM# OSST-3 – Install Additional Roof Insulation
Annual Energy Savings Installed Cost SIR Payback (years)
$68 $1,200 1.21 17.1
The existing roof insulation in the storage trailer has an R-value of R-25. By adding an additional layer of
R-21 insulation, the heat loss through the roof will be reduced. See item 3 in Appendix F for more
information.
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VIII.IV Administrative Controls for Energy Conservation and Optimization
While the intent of many energy conservation measures is to increase the efficiency of fuel-burning and
electrical equipment, an important factor of energy consumption lies in the operational profiles which
control the equipment usage. Such profiles can be managed by administrative controls and departmental
leadership. They determine how and when fuel-burning and electrical equipment are used, and therefore
have a greater impact on energy savings potential than simply equipment upgrades alone. Significant
energy cost savings can be realized when ECMs are combined with efficient-minded operational profiles.
Operational profiles may be outlined by organization policy or developed naturally or historically. These
profiles include, but are not limited to: operating schedules, equipment setpoints and control strategies,
maintenance schedules, and site and equipment selection.
Optimization of operational profiles can be accomplished by numerous methods so long as the intent is
reduction in energy-using equipment runtime. Due to the numerous methods of optimization, energy cost
savings solely as a result of operational optimization are difficult to predict. Quantification, however, is
easy to accomplish by metering energy usage during and/or after implementation of energy-saving
operational profiles and ECMs. Shown below are some examples which have proven successful for other
organizations.
Optimization of site selection includes scheduling and location of events. If several buildings in a given
neighborhood are all lightly used after regularly occupied hours, energy savings can be found when after-
hours events are consolidated and held within the most energy efficient buildings available for use. As a
result, unoccupied buildings could be shut down to the greatest extent possible to reduce energy
consumption.
Two operational behaviors which can be combined with equipment upgrades are operating schedules and
equipment control strategies including setpoints. Occupancy and daylight sensors can be programmed to
automatically shut off or dim lighting when rooms are unoccupied or sufficiently lit from the sun.
Operating schedules can be optimized to run equipment only during regular or high-occupancy periods.
Also, through a central control system, or with digital programmable thermostats, temperature setpoints
can be reduced during low-occupancy hours to maximize savings. In addition, sporadically used
equipment can be shut down during unoccupied hours to further save energy. In general, having
equipment operating in areas where no occupants are present is inefficient, and presents an opportunity
for energy savings.
Operational profiles can also be implemented to take advantage of no- or low-cost ECMs. Examples
include heating plant optimizations (boiler section cleaning, boiler flush-through cleaning) and tighter
controls of equipment setbacks and shutdowns (unoccupied zones equipment shutdown, easier access to
and finer control of equipment for after-hours control). In a large facility management program,
implementation of these measures across many or all sites will realize dramatic savings due to the
quantity of equipment involved.
Changes to building operational profiles can only be realized while simultaneously addressing health,
safety, user comfort, and user requirements first. It is impractical to expect users to occupy a building or
implement operational behaviors which do not meet such considerations. That said, it is quite practical for
management groups to implement administrative controls which reduce losses brought about by excess
and sub-optimum usage.
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Appendix A
Energy Benchmark Data
Trapper Creek Elementary School Draft Energy Audit Report
First Name Last Name Middle Name Phone
Rick Jensen 907‐376‐0806
State Zip
AK 99645
Monday‐
Friday
Saturday Sunday Holidays
7 am‐ 8 pm 0 0 0
Average # of
Occupants
During
34 0 0 0
Renovations / Notes
Date
None
Contact Person
City
Palmer501 N Gulkana St
Mailing Address
Building Name/ Identifier Building Usage Building Square Footage
99683
Email
ricky.jensen@matsuk12.us
Details
Mi 2.5 Petersville Rd
Primary
Operating
Hours
18,441
Facility Zip
499
Year Built
1982
REAL Preliminary Benchmark Data Form
PART I – FACILITY INFORMATION
Facility Owner
Mat‐Su School District
Facility Owned By Date
03/08/11Municipal Government/Subdivision
Trapper Creek
Community Population
Facility City
Trapper Creek Elementary
Building Type
School
Facility Address
Education
Notes
PART II – ENERGY SOURCES
Heating Oil Electricity Natural Gas Propane Wood Coal
$ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton
Other energy
sources?
2. Provide utilities bills for the most recent two‐year period for each energy source you use.
Any available drawings are kept at district office for maintenance.
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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Trapper Creek Elementary School Draft Energy Audit Report
Trapper Creek Elementary
Buiding Size Input (sf) =18,441
2009 Natural Gas Consumption (Therms)
2009 Natural Gas Cost ($)
2009 Electric Consumption (kWh)170,880
2009 Electric Cost ($)24,068
2009 Oil Consumption (Therms)14,610
2009 Oil Cost ($)29,833
2009 Total Energy Use (kBtu)2,044,176
2009 Total Energy Cost ($)53,901
Annual Energy Use Intensity (EUI)
2009 Natural Gas (kBtu/sf)
2009 Electricity (kBtu/sf)31.6
2009 Oil (kBtu/sf) 79.2
2009 Energy Utilization Index (kBtu/sf)110.8
Annual Energy Cost Index (ECI)
2009 Natural Gas Cost Index ($/sf)
2009 Electric Cost Index ($/sf)1.31
2009 Oil Cost Index ($/sf)1.62
2009 Energy Cost Index ($/sf)2.92
2010 Natural Gas Consumption (Therms)
2010 Natural Gas Cost ($)
2010 Electric Consumption (kWh)172,160
2010 El t i C t ($)19 9262010 Electric Cost ($)19,926
2010 Oil Consumption (Therms)11,541
2010 Oil Cost ($)25,825
2010 Total Energy Use (kBtu)1,741,671
2010 Total Energy Cost ($)45,751
Annual Energy Use Intensity (EUI)
2010 Natural Gas (kBtu/sf)
2010 Electricity (kBtu/sf)31.9
2010 Oil (kBtu/sf)62.6
2010 Energy Utilization Index (kBtu/sf)94.4
Annual Energy Cost Index (ECI)
2010 Natural Gas Cost Index ($/sf)
2010 Electric Cost Index ($/sf)1.08
2010 Oil Cost Index ($/sf)1.40
20010 Energy Cost Index ($/sf)2.48
Note:
1 kWh = 3,413 Btu's
1 Therm = 100,000 Btu's
1 CF ≈ 1,000 Btu's
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Trapper Creek Elementary SchoolDraft Energy Audit ReportTrapper Creek ElementaryElectricityBtus/kWh =3,413Provider Customer #Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)MEA E21000 Jan‐09 12/28/2008 1/27/20093018,320625$2,832$0.15MEA E21000 Feb‐09 1/27/2009 2/26/20093017,840609$2,758$0.15MEA E21000 Mar‐09 2/26/2009 3/25/20092715,040513$2,330$0.15MEA E21000 Apr‐09 3/25/2009 4/28/20093417,520598$2,484$0.14MEA E21000 May‐09 4/28/2009 5/27/20092912,960442$1,845$0.14MEA E21000 Jun‐09 5/27/2009 6/28/2009325,360183$780$0.15MEA E21000 Jul‐09 6/28/2009 7/28/2009306,240213$858$0.14MEA E21000 Aug‐09 7/28/2009 8/26/20092911,680399$1,581$0.14MEA E21000 Sep‐09 8/26/2009 9/27/20093214,960511$2,017$0.13MEA E21000 Oct‐09 9/27/2009 10/27/20093015,120516$1,956$0.13MEA E21000 Nov‐09 10/27/2009 11/28/20093219,120653$2,466$0.13MEA E21000 Dec‐09 11/28/2009 12/27/20092916,720571$2,160$0.13MEA E21000 Jan‐10 12/27/2009 1/26/20103017,280590$2,068$0.12MEA E21000 Feb‐10 1/26/2010 2/22/20102716,240554$1,945$0.12MEA E21000 Mar‐10 2/22/2010 3/28/20103418,240623$2,181$0.12MEA E21000 Apr‐10 3/28/2010 4/27/20103015,680535$1,749$0.11MEA E21000 May‐10 4/27/2010 5/25/20102813,040445$1,459$0.11MEAE21000Jun‐105/25/20106/27/2010338 800300$995$0 11MEAE21000Jun105/25/20106/27/2010338,800300$995$0.11MEA E21000 Jul‐10 6/27/2010 7/27/2010 30 7,520 257 $860 $0.11MEA E21000 Aug‐10 7/27/2010 8/28/2010 32 11,600 396 $1,310 $0.11MEA E21000 Sep‐10 8/28/2010 9/27/2010 30 12,480 426 $1,407 $0.11MEA E21000 Oct‐10 9/27/2010 10/26/2010 29 15,840 541 $1,841 $0.12MEA E21000 Nov‐10 10/26/2010 11/27/2010 32 17,840 609 $2,069 $0.12MEA E21000 Dec‐10 11/27/2010 12/27/2010 30 17,600 601 $2,042 $0.12Jan ‐ 09 to Dec ‐ 09 total:170,8805,8320$24,068$0Jan ‐ 10 to Dec ‐ 10 total:172,1605,8760$19,926$0$0.14$0.12Jan ‐ 10 to Dec ‐ 10 avg:Jan ‐ 09 to Dec ‐ 09 avg:Coffman Engineers, Inc.AkWarm No. CIRI-TKA-CAEC-01Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Trapper Creek Elementary SchoolDraft Energy Audit Report$1,000$1,500$2,000$2,500$3,00010,00015,00020,00025,000Electric Cost ($)Electric Consumption (kWh)Trapper Creek Elementary ‐Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)$0$50005,000Date (Mon ‐Yr)Coffman Engineers, Inc.AkWarm No. CIRI-TKA-CAEC-01Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Trapper Creek Elementary SchoolDraft Energy Audit ReportTrapper Creek ElementaryOilBtus/Gal =132,000Provider Customer #Month Start Date End Date Billing Days Consumption (Gal) Consumption (Therms) Demand Use Oil Cost ($) Unit Cost ($/Therm) Demand Cost ($)MarathonFO‐TCRK Jan‐09 1/1/2009 2/1/2009 31 2,174 2,870 $5,660 1.97MarathonFO‐TCRK Feb‐09 2/1/2009 3/1/2009 28 1,818 2,400 $4,734 1.97MarathonFO‐TCRK Mar‐09 3/1/2009 4/1/2009 31 1,682 2,220 $4,379 1.97MarathonFO‐TCRK Apr‐09 4/1/2009 5/1/2009 30 839 1,107 $2,183 1.97MarathonFO‐TCRK May‐09 5/1/2009 6/1/2009 31 253 334 $660 1.97MarathonFO‐TCRK Jun‐09 6/1/2009 7/1/2009 30 79 104 $205 1.97MarathonFO‐TCRK Jul‐09 7/1/2009 8/1/2009 31 5 6 $13 1.98MarathonFO‐TCRK Aug‐09 8/1/2009 9/1/2009 31 55 72 $142 1.97MarathonFO‐TCRK Sep‐09 9/1/2009 10/1/2009 30 322 425 $839 1.97MarathonFO‐TCRK Oct‐09 10/1/2009 11/1/2009 31 634 837 $1,819 2.17MarathonFO‐TCRK Nov‐09 11/1/2009 12/1/2009 30 1,569 2,072 $4,503 2.17MarathonFO‐TCRK Dec‐09 12/1/2009 1/1/2010 31 1,637 2,161 $4,698 2.17MarathonFO‐TCRK Jan‐10 1/1/2010 2/1/2010 31 1,743 2,301 $5,002 2.17MarathonFO‐TCRK Feb‐10 2/1/2010 3/1/2010 28 1,129 1,491 $3,240 2.17MarathonFO‐TCRK Mar‐10 3/1/2010 4/1/2010 31 1,233 1,627 $3,536 2.17MarathonFO‐TCRK Apr‐10 4/1/2010 5/1/2010 30 698 921 $2,002 2.17MarathonFO‐TCRK May‐10 5/1/2010 6/1/2010 31 255 336 $731 2.17h////$Marathon FO‐TCRK Jun‐10 6/1/2010 7/1/2010307497$2112.17Marathon FO‐TCRK Jul‐10 7/1/2010 8/1/2010312128$612.18Marathon FO‐TCRK Aug‐10 8/1/2010 9/1/2010312837$812.17Marathon FO‐TCRK Sep‐10 9/1/2010 10/1/201030256338$7352.17Marathon FO‐TCRK Oct‐10 10/1/2010 11/1/201031590779$1,8252.34Marathon FO‐TCRK Nov‐10 11/1/2010 12/1/2010301,0301,360$3,1862.34Marathon FO‐TCRK Dec‐10 12/1/2010 1/1/2011311,6862,226$5,2152.34Jan ‐ 09 to Dec ‐ 09 total:11,06814,6100$29,833$0Jan ‐ 10 to Dec ‐ 10 total:8,74311,5410$25,825$0Jan ‐ 09 to Dec ‐ 09 avg:2.02Jan ‐ 10 to Dec ‐ 10 avg:2.22Coffman Engineers, Inc.AkWarm No. CIRI-TKA-CAEC-01Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Trapper Creek Elementary SchoolDraft Energy Audit Report$2,000.00 $3,000.00 $4,000.00 $5,000.00 $6,000.00 1,0001,5002,0002,5003,0003,500Oil Cost ($)Oil Consumption (Therms)Trapper Creek Elementary ‐Oil Consumption (Therms) vs. Oil Cost ($)Oil Consumption (Therms)Oil Cost ($)$0.00 $1,000.00 0500Date (Mon ‐Yr)Coffman Engineers, Inc.AkWarm No. CIRI-TKA-CAEC-01Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Appendix B
AkWarm Commercial Reports
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
ENERGY AUDIT REPORT – PROJECT SUMMARY – 6/14/2012 9:04 AM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Trapper Creek Elementary School Auditor Company: Coffman Engineers, Inc.
Address: Mile 2.5 Petersville Road Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Trapper Creek Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Rick Jensen
Client Address: 3901 E. Bogard
Wasilla, AK 99654
Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-5042
Client Phone: (907) 864-2007 Auditor Comment:
Client FAX:
Design Data
Building Area: 17,757 square feet Design Heating Load: Design Loss at Space: 474,438
Btu/hour
with Distribution Losses: 499,409 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency
and 25% Safety Margin: 761,294 Btu/hour
Note: Additional Capacity should be added for DHW
load, if served.
Typical Occupancy: 34 people Design Indoor Temperature: 68 deg F (building
average)
Actual City: Trapper Creek Design Outdoor Temperature: -25.2 deg F
Weather/Fuel City: Trapper Creek Heating Degree Days: 11,863 deg F-days
Utility Information
Electric Utility: Matanuska Electric Assn. -
Commercial - Sm
Natural Gas Provider: None
Average Annual Cost/kWh: $0.130/kWh Average Annual Cost/ccf: $0.000/ccf
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-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 $28,154 $0 $1,701 $7,627 $3,753 $0 $0 $3,739 $0 $44,975 With Proposed Retrofits $19,885 $0 $1,696 $4,118 $3,753 $0 $0 $3,739 $0 $33,191 SAVINGS $8,269 $0 $5 $3,510 $0 $0 $0 $0 $0 $11,784
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01 $0$10,000$20,000$30,000$40,000$50,000Existing RetrofitVentilation and FansSpace HeatingOther ElectricalLightingDomestic Hot WaterAnnual Energy Costs by End Use
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01 $0$10,000$20,000$30,000$40,000$50,000Existing Retrofit#2 OilElectricityAnnual Energy Costs by Fuel
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01 Annual #2 Fuel Oil Usage By Month Monthly Modeled Consumption (Blue) compared to Actual Fuel Oil#2 Consumption (Orange)
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01 Annual Electric Usage By Month Monthly Modeled Consumption (Blue) compared to Actual Electric Consumption (Orange).
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Appendix C
Major Equipment List
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01 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 BURNHAM V904A CAST IRON #2 FUEL OIL 554.4 MBH ≈ 87% 30 ≈ 28 B-2 BOILER RM BUILDING HEATING BURNHAM V904A CAST IRON #2 FUEL OIL 554.4 MBH ≈ 87% 30 ≈ 28 WH-1 BOILER RM. DOMESTIC HOT WATER PVI 3.8-N-250-A-0 #2 FUEL OIL 540 MBH ≈ 86% 30 0 HX-2 BOILER RM FIRE WATER CIRC BELL & GOSSETT BP411-020 PLATE AND FRAME - - - 24 0 P-1 BOILER RM HEATING WATER CIRC TACO 10/82 INLINE 55GPM 28' NEMA STANDARD 3/4 10 0 P-1A BOILER RM HEATING WATER CIRC TACO 10/82 INLINE 55GPM 28' NEMA STANDARD 3/4 10 0 P-2 BOILER RM DOMESTIC HOT WATER RECIRC GRUNDFOS UP 15-42 SF INLINE 4GPM 8' NEMA STANDARD 1/25 10 0 P-3 BOILER RM ROOF MELT CIRC GRUNDFOS UPS 40-40F INLINE 32GPM 42 ' NEMA STANDARD 3/4 10 0 P-4 BOILER RM HEATING WATER CIRC GRUNDFOS UPS 50-160B INLINE 32 GPM 42' NEMA STANDARD 3/4 10 0 P-5 BOILER RM FIRE WATER CIRC GRUNDFOS UPS 15-58 FC INLINE 25 GPM NEMA STANDARD 1/3 10 0 P-6 BOILER RM DAY TANK SIMPLEX - - - - 1/3 10 0 F-1 ABOVE LOCKER RMS CLASSROOM SUPPLY TRANE CLIMATE CHANGER CCB21 CENTRIFUGAL 11697CFM 2.51" ≈ 86% 10 25 0
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) F-2 ABOVE STOR 106 GYMNASIUM SUPPLY TEMP-MASTER HSF 4000 CENTRIFUGAL 3750CFM 0.6" ≈ 75% 3/4 25 0 F-3 ABOVE STOR 106 GYMNASIUM SUPPLY TEMP-MASTER HFS4 4000A CENTRIFUGAL 3750CFM 0.6" ≈ 75% 3/4 25 0 F-4 ABOVE STOR 106 GYMNASIUM SUPPLY TEMP-MASTER HFS4 4000A CENTRIFUGAL 3750CFM 0.6" ≈ 75% 3/4 25 0 F-5 BOILER RM VESTIBULE SUPPLY PACE SCF-79A CENTRIFUGAL 770CFM 0.5" ≈ 75% 1/4 25 0 F-6 ABOVE CORR 104 CORRIDOR/ OFFICE SUPPLY PACE SCF-85A CENTRIFUGAL 615CFM 0.3" ≈ 75% 1/6 25 0 F-7 BOILER RM BOILER RM SUPPLY - - IN-LINE 1300CFM 0.125" ≈ 75% 1/4 25 0 F-8 ABOVE ADMIN 133 BATHROOM EXHAUST - 140CFM 0.10" ≈ 75% 1/12 15 0 F-9 ABOVE JAN 123 BATHROOM EXHAUST - - - 80CFM 0.10" NEMA STANDARD 1/8 25 0 F-10 ABOVE BOYS 126 BATHROOM EXHAUST - - - 405CFM 0.05" NEMA STANDARD 1/6 25 0 F-11 ABOVE SHOWER RMS BATHROOM EXHAUST - - - 155CFM 0.05" NEMA STANDARD 1/6 25 0 F-12 MECH LOFT ABOVE KITCHEN KITCHEN EXHAUST - - - 2500CFM 1.5" NEMA STANDARD 1.5 25 0
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Appendix D
School Energy Conservation Measures
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
0 a Refrigerators Replace residential & light
commercial
refrigerators/freezers older
than 5 years old
- - - <10
1 Lighting - Controls
Retrofit: Corridors
Improve Manual Switching $82 $100 11.99 1.2
2 Lighting - Controls
Retrofit: Custodian
Mechanical and
Storage Rooms
Improve Manual Switching $135 $200 9.89 1.5
3 Lighting - Controls
Retrofit: Corridors
Improve Manual Switching $250 $400 9.12 1.6
4 Setback
Thermostat: Gym
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for the
Gym space.
$1,018 $2,000 6.91 2
5 Lighting -
Combined Retrofit:
Gym Lighting
Replace with 2 FLUOR (6)
T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
and Add new Occupancy
Sensor
$827 $1,750 6.91 2.1
6 Lighting - Controls
Retrofit: Classroom
and Library
Lighting
Add new Occupancy Sensor $265 $600 6.45 2.3
7 Lighting - Controls
Retrofit: Office
Lighting
Add new Occupancy Sensor $36 $150 3.53 4.1
8 Setback
Thermostat:
Intermittent/storage
/corridor areas
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for the
Intermittent/storage/corridor
areas space.
$2,222 $10,000 3.02 4.5
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
9 Lighting - Controls
Retrofit: Class and
Library Lighting
Improve Manual Switching $35 $200 2.57 5.7
10 Lighting - Controls
Retrofit: Restroom
Lighting
Add new Occupancy Sensor $51 $450 1.65 8.9
11 Lighting - Power
Retrofit: Class and
Library Lighting
Replace with FLUOR CFL,
Spiral 23 W
$13 $50 1.56 4
12 Lighting - Controls
Retrofit: classroom
and Library
Lighting
Add new Occupancy Sensor $20 $200 1.47 9.9
13 Setback
Thermostat:
Classrooms/Office
Area
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for the
Classrooms/Office Area
space.
$1,625 $16,000 1.38 9.8
14 HVAC And DHW ECM Pump Replacement $600 $5,764 1.21 9.6
15 Lighting - Power
Retrofit: Exterior
Lighting
Replace with 4 LED 150W
Module StdElectronic
$642 $8,000 1.17 12.5
16 Lighting - Power
Retrofit: Exterior
Lighting
Replace with 7 LED 35W
Module StdElectronic
$203 $2,800 1.06 13.8
17 Air Tightening Perform air sealing to reduce
air leakage by 20%.
$1,953 $18,000 1.01 9.2
18 Lighting -
Combined Retrofit:
Gym Lighting
Replace with 14 FLUOR (6)
T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
and Add new Occupancy
Sensor
$647 $11,650 0.81 18
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
19 Lighting - Power
Retrofit: Exterior
Lighting
Replace with 4 LED 72W
Module StdElectronic
$220 $4,800 0.67 21.9
20 Exterior Door:
Exterior Doors
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$309 $12,298 0.60 39.7
21 Lighting - Controls
Retrofit: Classroom
and Library
Lighting
Add new Occupancy Sensor $2 $50 0.60 24.5
22 Lighting - Controls
Retrofit: Classroom
and Library
Lighting
Add new Occupancy Sensor $2 $50 0.60 24.6
23 Lighting - Power
Retrofit: Corridors
Replace with 4 LED 35W
Module StdElectronic
$48 $1,200 0.58 25.2
24 Lighting - Controls
Retrofit: Custodian
Mechanical and
Storage Rooms
Add new Occupancy Sensor $5 $150 0.48 30.4
25 Window/Skylight:
Vestibule Windows
Replace existing window
with U-0.30 vinyl window
$97 $3,694 0.46 37.9
26 Window/Skylight:
South - Vestibule
Windows
Replace existing window
with U-0.30 vinyl window
$115 $4,618 0.43 40.3
27 Lighting - Controls
Retrofit: Restroom
Lighting
Add new Occupancy Sensor $4 $150 0.40 36.8
28 Lighting - Controls
Retrofit: Office
Lighting
Add new Occupancy Sensor $4 $150 0.32 34.9
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
29 Lighting - Controls
Retrofit: Office
Lighting
Add new Occupancy Sensor $3 $150 0.30 49.1
30 Lighting - Power
Retrofit: Custodian
Mechanical and
Storage Rooms
Replace with 4 FLUOR
CFL, Spiral 23 W
$6 $120 0.29 21.3
31 Window/Skylight:
Classroom
Windows
Replace existing window
with U-0.30 vinyl window
$340 $33,188 0.18 97.7
32 Lighting - Controls
Retrofit: Custodian
Mechanical and
Storage Rooms
Add new Occupancy Sensor $1 $150 0.14 100.8
33 Lighting - Controls
Retrofit: Kitchen
Lighting
Add new Occupancy Sensor $1 $150 0.12 123.9
34 Lighting - Controls
Retrofit: Restroom
Lighting
Add new Occupancy Sensor $1 $150 0.12 127.2
35 Lighting - Power
Retrofit: Custodian
Mechanical and
Storage Rooms
Replace with FLUOR (2) T8
4' F32T8 32W Standard
Program StdElectronic
$1 $150 0.10 146.6
TOTAL $11,784 $139,532 1.14 11.8
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 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.
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-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
20 Exterior Door:
Exterior Doors
Door Type: Entrance,
Metal, polyurethane core,
metal edge
Modeled R-Value: 2.5
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$12,298 $309
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
25 Window/Skylig
ht: Vestibule
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
Replace existing window
with U-0.30 vinyl
window
$3,694 $97
26 Window/Skylig
ht: South -
Vestibule
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
Replace existing window
with U-0.30 vinyl
window
$4,618 $115
31 Window/Skylig
ht: Classroom
Windows
Glass: Double, glass
Frame: Wood\Vinyl
Spacing Between Layers:
Half Inch
Gas Fill Type: Air
Modeled U-Value: 0.51
Solar Heat Gain Coefficient
including Window
Coverings: 0.46
Replace existing window
with U-0.30 vinyl
window
$33,188 $340
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Air Leakage
Rank Location Estimated Air Leakage Recommended Air
Leakage Target
Installed
Cost
Annual
Energy
Savings
17 Air Tightness estimated as:
1.10 cfm/ft2 of above-grade
shell area at 75 Pascals
Perform air sealing to
reduce air leakage by
20%.
$18,000 $1,953
2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
14 ECM Pump Replacement $5,764 $600
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
4 Gym Existing Unoccupied
Heating Setpoint: 68.0 deg
F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Gym space.
$2,000 $1,018
8 Intermittent/stor
age/corridor
areas
Existing Unoccupied
Heating Setpoint: 68.0 deg
F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Intermittent/storage/
corridor areas space.
$10,000 $2,222
13 Classrooms/Offi
ce Area
Existing Unoccupied
Heating Setpoint: 68.0 deg
F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Classrooms/Office
Area space.
$16,000 $1,625
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
1 Corridors FLUOR (4) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Improve Manual
Switching
$100 $82
2 Custodian
Mechanical and
Storage Rooms
2 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Improve Manual
Switching
$200 $135
3 Corridors 4 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Improve Manual
Switching
$400 $250
5 Gym Lighting 2 MH 400 Watt Magnetic
with Manual Switching
Replace with 2 FLUOR
(6) T5 45.2" F54W/T5
HO Standard (2)
StdElectronic and Add
new Occupancy Sensor
$1,750 $827
6 Classroom and
Library Lighting
48 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$600 $265
7 Office Lighting 5 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$150 $36
9 Class and
Library Lighting
2 INCAN A Lamp,
Halogen 75W with Manual
Switching
Improve Manual
Switching
$200 $35
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
10 Restroom
Lighting
7 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$450 $51
11 Class and
Library Lighting
INCAN A Lamp, Std 75W
with Manual Switching
Replace with FLUOR
CFL, Spiral 23 W
$50 $13
12 classroom and
Library Lighting
13 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$200 $20
15 Exterior
Lighting
4 HPS 400 Watt Magnetic
with Manual Switching
Replace with 4 LED
150W Module
StdElectronic
$8,000 $642
16 Exterior
Lighting
7 HPS 70 Watt Magnetic
with Manual Switching
Replace with 7 LED 35W
Module StdElectronic
$2,800 $203
18 Gym Lighting 14 MH 400 Watt Magnetic
with Manual Switching
Replace with 14 FLUOR
(6) T5 45.2" F54W/T5
HO Standard (2)
StdElectronic and Add
new Occupancy Sensor
$11,650 $647
19 Exterior
Lighting
4 HPS 150 Watt Magnetic
with Manual Switching
Replace with 4 LED 72W
Module StdElectronic
$4,800 $220
21 Classroom and
Library Lighting
2 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$50 $2
22 Classroom and
Library Lighting
2 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$50 $2
23 Corridors 4 HPS 70 Watt Magnetic
with Manual Switching
Replace with 4 LED 35W
Module StdElectronic
$1,200 $48
24 Custodian
Mechanical and
Storage Rooms
FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$150 $5
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
27 Restroom
Lighting
4 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$150 $4
28 Office Lighting 2 FLUOR (3) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$150 $4
29 Office Lighting 3 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$150 $3
30 Custodian
Mechanical and
Storage Rooms
4 INCAN A Lamp, Std
75W with Manual
Switching
Replace with 4 FLUOR
CFL, Spiral 23 W
$120 $6
32 Custodian
Mechanical and
Storage Rooms
FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$150 $1
33 Kitchen
Lighting
FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$150 $1
34 Restroom
Lighting
2 FLUOR Circline 12"
FC12T9 32W Magnetic
with Manual Switching
Add new Occupancy
Sensor
$150 $1
35 Custodian
Mechanical and
Storage Rooms
FLUOR (2) T12 4' F40T12
40W Standard Magnetic
with Manual Switching
Replace with FLUOR (2)
T8 4' F32T8 32W
Standard Program
StdElectronic
$150 $1
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Appendix E
Tractor Storage Shed Energy Conservation Measures
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 2/1/2012 10:42
AM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Trapper Creek Elementary School –
Tractor Storage Shed
Auditor Company: Coffman Engineers, Inc.
Address: Mile 2.5 Petersville Road Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Trapper Creek Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Rick Jensen
Client Address: 3901 E. Bogard
Wasilla, AK 99654
Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-5042
Client Phone: (907) 864-2007 Auditor Comment:
Client FAX:
Design Data
Building Area: 144 square feet Design Heating Load: Design Loss at Space: 9,852
Btu/hour
with Distribution Losses: 9,852 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency
and 25% Safety Margin: 15,019 Btu/hour
Note: Additional Capacity should be added for DHW
load, if served.
Typical Occupancy: 0 people Design Indoor Temperature: 68 deg F (building
average)
Actual City: Trapper Creek Design Outdoor Temperature: -25.2 deg F
Weather/Fuel City: Trapper Creek Heating Degree Days: 11,863 deg F-days
Utility Information
Electric Utility: Matanuska Electric Assn. -
Commercial - Sm
Natural Gas Provider: None
Average Annual Cost/kWh: $0.130/kWh Average Annual Cost/ccf: $0.000/ccf
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-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 $1,042 $0 $0 $3 $0 $0 $0 $0 $0 $1,045 With Proposed Retrofits $679 $0 $0 $1 $0 $0 $0 $0 $0 $679 SAVINGS $364 $0 $0 $2 $0 $0 $0 $0 $0 $366
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01 $0$200$400$600$800$1,000$1,200Existing RetrofitSpace HeatingLightingAnnual Energy Costs by End Use
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Setback
Thermostat:
Tractor Storage
Shed
Implement a Heating
Temperature Unoccupied
Setback to 55.0 deg F for the
Tractor Storage Shed space.
$296 $1 3634.82 0
2 Air Tightening Perform air sealing to reduce
air leakage by 20%.
$54 $450 1.05 8.3
3 Ceiling w/ Attic:
Ceiling
Add R-21 fiberglass batts to
attic with Standard Truss.
$16 $782 0.42 49.6
4 Lighting: Tractor
Shed Lighting
Replace with 2 FLUOR
CFL, Spiral 23 W
$0 $60 0.01 797.3
5 Lighting: Tractor
Shed Lighting
Add new Occupancy Sensor $0 $150 0.00 19051.2
TOTAL $366 $1,443 3.07 3.9
ENERGY AUDIT REPORT – ENERGY EFFICIENT RECOMMENDATIONS
2. Building Envelope
Insulation
Rank Location Existing Type/R-Value Recommendation Type/R-
Value
Installed
Cost
Annual
Energy
Savings
3 Ceiling w/ Attic:
Ceiling
Framing Type: Standard
Framing Spacing: 16 inches
Insulated Sheathing: None
Bottom Insulation Layer:
R-25 Batt:FG or RW, 8
inches
Top Insulation Layer: None
Modeled R-Value: 26.3
Add R-21 fiberglass batts
to attic with Standard
Truss.
$782 $16
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Air Leakage
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
2 Air Tightness estimated as:
1.30 cfm/ft2 of above-grade
shell area at 75 Pascals
Perform air sealing to
reduce air leakage by
20%.
$450 $54
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
1 Tractor Storage
Shed
Existing Unoccupied
Heating Setpoint: 65.0 deg
F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Tractor Storage Shed
space.
$1 $296
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
4 Tractor Shed
Lighting
2 INCAN A Lamp, Std
75W with Manual
Switching
Replace with 2 FLUOR
CFL, Spiral 23 W
$60 $0
5 Tractor Shed
Lighting
2 INCAN A Lamp, Std
75W with Manual
Switching
Add new Occupancy
Sensor
$150 $0
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Appendix F
Office Supply Storage Trailer Conservation Measures
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 2/1/2012 10:57
AM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Trapper Creek Elementary School -
Office Supply Storage Shed
Auditor Company: Coffman Engineers, Inc.
Address: Mile 2.5 Petersville Road Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Trapper Creek Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Rick Jensen
Client Address: 3901 E. Bogard
Wasilla, AK 99654
Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-5042
Client Phone: (907) 864-2007 Auditor Comment:
Client FAX:
Design Data
Building Area: 540 square feet Design Heating Load: Design Loss at Space: 37,459
Btu/hour
with Distribution Losses: 37,459 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency
and 25% Safety Margin: 57,102 Btu/hour
Note: Additional Capacity should be added for DHW
load, if served.
Typical Occupancy: 0 people Design Indoor Temperature: 65 deg F (building
average)
Actual City: Trapper Creek Design Outdoor Temperature: -25.2 deg F
Weather/Fuel City: Trapper Creek Heating Degree Days: 11,863 deg F-days
Utility Information
Electric Utility: Matanuska Electric Assn. -
Commercial - Sm
Natural Gas Provider: None
Average Annual Cost/kWh: $0.130/kWh Average Annual Cost/ccf: $0.000/ccf
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-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 $3,867 $0 $0 $11 $0 $0 $0 $0 $0 $3,878 With Proposed Retrofits $2,319 $0 $0 $5 $0 $0 $0 $0 $0 $2,324 SAVINGS $1,548 $0 $0 $6 $0 $0 $0 $0 $0 $1,554
Trapper Creek Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01 $0$1,000$2,000$3,000$4,000Existing RetrofitSpace HeatingLightingAnnual Energy Costs by End Use
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
PRIORITY LIST – RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Setback
Thermostat:
Storage Shed
Implement a Heating
Temperature Unoccupied
Setback to 55.0 deg F for the
Storage Shed space.
$1,129 $1 13858.52 0
2 Air Tightening Perform air sealing to reduce
air leakage by 20%.
$226 $1,500 1.31 6.7
3 Ceiling w/ Attic:
Ceiling
Add R-21 fiberglass batts to
attic with Standard Truss.
$68 $1,161 1.21 17.1
4 Window/Skylight:
Windows
Replace existing window
with U-0.30 vinyl window
$78 $2,541 0.47 32.7
5 Exterior Door:
House
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$53 $3,676 0.30 68.8
6 Lighting: Storage
Shed Lighting
Add new Occupancy Sensor $0 $150 0.02 861.7
7 Lighting: Storage
Shed Lighting
Replace with 8 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$0 $1,200 0.00 5921.9
TOTAL $1,554 $10,228 1.91 6.6
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
ENERGY AUDIT REPORT – ENERGY EFFICIENT RECOMMENDATIONS
3. Building Envelope
Insulation
Rank Location Existing Type/R-Value Recommendation Type/R-
Value
Installed
Cost
Annual
Energy
Savings
3 Ceiling w/ Attic:
Ceiling
Framing Type: Standard
Framing Spacing: 16 inches
Insulated Sheathing: None
Bottom Insulation Layer:
R-25 Batt:FG or RW, 8
inches
Top Insulation Layer: None
Insulation Quality:
Damaged
Modeled R-Value: 25
Add R-21 fiberglass batts
to attic with Standard
Truss.
$1,161 $68
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
4 Window/Skylig
ht: Windows
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
including Window
Coverings: 0.46
Replace existing window
with U-0.30 vinyl
window
$2,541 $78
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Exterior Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
5 Exterior Door:
House
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.
$3,676 $53
Air Leakage
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
2 Air Tightness estimated as:
1.30 cfm/ft2 of above-grade
shell area at 75 Pascals
Perform air sealing to
reduce air leakage by
20%.
$1,500 $226
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
1 Storage Shed Existing Unoccupied
Heating Setpoint: 65.0 deg
F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Storage Shed space.
$1 $1,129
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
6 Storage Shed
Lighting
8 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Add new Occupancy
Sensor
$150 $0
7 Storage Shed
Lighting
8 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 8 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$1,200 $0
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Appendix G
Site Visit Photos
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
1. Main Entrance, East Side 2. South End and West Side
3. West Side Continued 4. North End
5. East Side Continued 6. Storage Shed
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
7. Office Supply Storage Trailer 8. Boilers B-1 & B-2
9. Water Heater WH-1, B-1, and P-4 10. Pumps P-1 & P-1A
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
11. Pump P-3 12. Supply Fan F-7
13. Day Tank and PMP-6 14. Heat Exchanger HX-2 and P-5
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
15. School Fan F-1, Fan Room Above Restrooms 16. Gym Fan F-2 & F-3, Fan Room Above
Restrooms
17. Gym Fan F-2 & F-4, Fan Room Above
Restrooms 18. F-6, Fan Room Above Restrooms
19. Kitchen Make-Up Air F-13, Fan Room
Above Kitchen 20. Typical Window
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
21. Entryway Fan F-5, Boiler Room 22. Typical Thermostat
23. Interior of Tractor Storage Shed 24. Interior of Office Supply Storage Trailer
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Appendix G
Thermographic Photos
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
Coffman Engineers made miscellaneous thermographic images of Trapper Creek Elementary School
using an FLIR T300 Infrared Camera. This is not a thermographic study, rather photographs to illustrate
easy-to-identify heat losses.
25. Optical Image, East Face.
26. Thermal Image East Face. Temperatures
indicated by color scale on right. Yellow
Indicates Heat leakage. The outside
temperature was about 1°F. Heat loss along
perimeter of door is expected.
27. Optical Image, Front Entrance. 28. Thermal Image, Front Entrance. No unusual
heat loss observed.
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
29. Optical Image, South and West Face. 30. Thermal Image, South and West Face. No
unusual heat loss observed.
31. Optical Image, West Gym.
32. Thermal Image, West Gym. No unusual heat
loss observed. Heat losses near roof are from
ventilated roof.
Heat Loss
from roof
melt system.
Trapper Creek Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/14/2012 AkWarm No. CIRI-TKA-CAEC-01
33. Optical Image, North Gym.
34. Thermal Image, North Gym. The wall
insulation for ends at the indicated location.
Above this point, the attic space above the
gym is ventilated.
35. Optical Image, Tractor Storage Shed.
36. Thermal Image, Tractor Storage Shed. Large
amounts of heat loss are found through the
roof.
37. Optical Image, Office Supply Storage Trailer.
38. Thermal Image, Office Supply Storage
Trailer. Large amounts of heat loss are found
near the ceiling space.
Wall /roof
insulation
ends at this
point.
Excessive
heat loss
through
ceiling/roof.