HomeMy WebLinkAboutCIRI-ANC-CAEC Muldoon Elementary School 2012-EEENERGY AUDIT FINAL REPORT
Muldoon Elementary School
525 Cherry Street
Anchorage, AK 99517
p (907) 742-1460
AkWarm ID No. CIRI-ANC-CAEC-06
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
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 i AkWarm No. CIRI-ANC-CAEC-06
Contents
I. Executive Summary .................................................................................................................. 1
II. Introduction .............................................................................................................................. 2
III. Energy Audit Process ............................................................................................................. 3
IV. Method of Analysis ................................................................................................................. 4
V. Building Description ................................................................................................................ 5
V.I ARCHITECTURAL DESCRIPTION ............................................................................................................................ 5
V.II MECHANICAL DESCRIPTION ............................................................................................................................... 6
V.III ELECTRICAL DESCRIPTION ................................................................................................................................ 6
V.IV PORTABLE BUILDINGS DESCRIPTION ................................................................................................................ 7
VI. Historic Energy Consumption and Cost............................................................................... 9
VI.I ELECTRICAL CONSUMPTION DATA ..................................................................................................................... 9
VI.II NATURAL GAS CONSUMPTION DATA ................................................................................................................ 9
VI.III OVERALL ENERGY CONSUMPTION DATA ......................................................................................................... 9
VII. Equipment Inventory and Photo Survey .......................................................................... 11
VIII. Energy Conservation Measures ....................................................................................... 12
VIII.I SCHOOL BUILDING ECMS .............................................................................................................................. 12
VIII.II PORTABLE BUILDING ECMS ......................................................................................................................... 16
VIII.III 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 – Energy Conservation Measures
Appendix E – Site Visit Photos
Appendix F – 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 Muldoon Elementary School as part of a
contract for:
Alaska Housing Finance Corporation
Contact: Rebekah Luhrs
4300 Boniface Parkway
Anchorage, AK 99510
Email: rluhrs@ahfc.us
Anchorage School District
Contact: Calvin Mundt
1301 Labar Street
Anchorage, AK 99515-3517
Email:mundt_calvin@asdk12.org
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 $69,112
Natural Gas $67,956
Total $137,068
January 2009-December 2010 Energy Utilization Index (EUI) = 143.7 kBtu/sf
January 2009-December 2010 Energy Cost Index = 2.14 $/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
Muldoon Elementary School (MES)
Rank Feature Recommendation Annual
Energy
Savings
Installed
Cost
SIR Payback
(Years)
MES-0a Refrigerators Replace Refrigerators older
than 5 years old
-- - <10
MES-1 b Boiler
Shutdown
Shutdown boilers during
summer months
$1,472 $720 32.85 0.5
MES-2 Setback
Thermostat:
All Building
Spaces
Implement a Heating
Temperatures Unoccupied
Setback to 60.0 deg F for
all building spaces
$11,846 $792 12.72 <0.1
MES-3 Lighting:
Mechanical
Rooms
Switch night lights with
local lighting Circuit
$115 $500 3.54 4.3
MES-4 Lighting:
Office
Lighting
Add new Occupancy
Sensors and Re-lamp
Incandescent Desk Lamp
with Compact Fluorescent
Lamps
$333 $1,530 3.27 4.6
MES-5 Lighting:
Corridor
Lighting
Switch night lights with
local lighting Circuit, Add
new "Bug-Eyed"
emergency light fixtures
$833 $5,250 2.44 6.3
MES-6 HVAC and
DHW
Install an Exhaust Stack
Economizer
$2,838 $21,000 2.17 7.4
MES-7 Lighting:
Library
Lighting
Re-lamp the Incandescent
Light Fixtures with
Compact Fluorescent
Lamps
$7 $60 1.69 8.6
MES-8b,c HVAC and
DHW
Install EC Motors on
Pumps P-3, P-4, and P-5
$502 $4,974 1.52 9.9
MES-9 Lighting:
Exterior
Lighting
Replace the Exterior Metal
Halide Wall Pack and
Canopy Light Fixtures with
LED Light Fixtures
$1,680 $17,000 1.52 10.1
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Executive Summary – Recommended ECMs
Muldoon Elementary School (MES)
Rank Feature Recommendation Annual
Energy
Savings
Installed
Cost
SIR Payback
(Years)
MES-10 Air Tightening Perform air sealing to
reduce air leakage by 20%.
$2,479 $22,000 1.02 8.9
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 ECM item was modeled with separate AkWarm model and as a result, the item is not an additive measure and is
not included in the final totals
c This item is intended to be implemented as HVAC pumps burn out and require replacement, when expenses must
be made due to equipment failure. This is the cost difference between standard efficient motors and high efficiency
Electronically Commutated Motors for the pumps.
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Executive Summary – Recommended ECMs
Portable Building (PB)
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
PB-1 Portable
Building
Skirting
Install R-15 rigid foam
board to interior or exterior
side of wall. Does not
include cost of coverings.
$1,036 $1,624 13.20 1.6
PB-2 Setback
Thermostat:
Portable
Building
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Portable Building
space.
$565 $1,000 6.93 1.8
PB-3 Portable
Building -
Cold Roof
Add R-19 dense-pack to
existing insulation.
$299 $1,943 3.18 6.5
PB-4 Portable
Building -
Doors
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$93 $781 2.47 8.4
PB-5 Lighting:
Portable
Replace with FLUOR (4)
T8 4’ F32T8 32W
Standard Program
StdElectronic and Add
new occupancy sensor
$38 $500 1.16 13.3
PB-6 Air
Tightening
Perform air sealing to
reduce air leakage by 30%.
$116 $950 1.07 8.2
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II. Introduction
This energy audit was conducted at Muldoon Elementary School (MES) for AHFC and Anchorage
School District. The school is an approximately 63,924 square foot (sf) campus that includes 62,004 sf of
classrooms, restrooms, administrative offices, a library, a gymnasium, and a multipurpose room. The
school campus also includes two portable classroom units averaging 960 sf each for a total of 1,920 sf.
The location of the school is shown in the following regional and overhead images. The energy audit was
conducted in order to evaluate areas and equipment where energy savings can be realized. The savings
were then compared to a baseline and evaluated for reasonable project financial ratios and payback.
Anchorage, Alaska – Google Maps
Muldoon Elementary School – Google Maps
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III. Energy Audit Process
Prior to visiting the school, the first task was to collect and review two years of utility data for electricity
and natural gas usage. This information was used to analyze operational characteristics, calculate energy
benchmarks for comparison to industry averages, estimate savings potential and establish a baseline to
monitor the effectiveness of implemented energy conservation measures. A spreadsheet was used to enter,
sum, and calculate benchmarks and to graph energy use information (see Appendix A). The primary
benchmark calculation used for comparison and baseline data is the Energy Utilization Index, or EUI (see
Section VI).
After gathering the utility data and calculating the EUI, the next step in the audit process was to review
the architectural and engineering drawings to develop a building profile which documented building age,
type, usage, and major energy consuming equipment or systems such as lighting, Heating, Ventilating,
and Air Conditioning (HVAC), water heating, refrigeration, snow-melt, and etc. The building profile is
utilized to generate, and answer, all possible questions regarding the facility’s energy usage. These
questions were then compared to the energy usage profiles developed during the utility data gathering
step. After this information was gathered, the next step in the process was to conduct a site survey.
A site survey was completed on December 6, 2011. Time was spent inspecting the building systems that
impact energy consumption and answering questions from the preliminary review. The on-site contact
during the investigation was Mr. Paul Kapinos of the Anchorage School District (ASD) Operations
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, researching of possible
conservation opportunities, organizing the audit into a comprehensive report, and making ECM
recommendations for mechanical, electrical, and building envelope improvements.
1 Mr. Paul Kapinos, (907) 348-5252 (office), (907) 242-1187 (mobile)
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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 the
kitchen, offices, and classrooms. An understanding of how the equipment is used is determined during the
audit.
The collected data was entered into AkWarm Commercial™ software, an energy calculating program for
buildings. The data was processed by AkWarm to model a baseline from which ECMs could be
considered. The model was compared to actual utility costs to ensure the quality of 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
Muldoon Elementary School is a single story building comprised of three wings of classroom and office
spaces, a gymnasium, kitchen, library, and a multipurpose room. The North wing houses 10 primary
classrooms and a resource room. The East wing houses four kindergarten classrooms, an art room, and the
main school office. The West wing houses 10 intermediate classrooms, a resource room, and some
intermittently used storage spaces. The school was constructed in 1999 following the demolition of the
adjacent existing school building. The facility is occupied by approximately 500 persons and is operated
from 7 a.m. until 6 p.m., five days a week year round. The building is also available as rented space in the
evenings and on weekends by request. There are two portable buildings on the property that are used as
classrooms on weekdays from 7 a.m. until 3:30 p.m.
V.I Architectural Description
Wall, floor, and roof construction details were obtained from the architectural drawings. Exterior walls of
the school were constructed using predominantly 6” metal studs filled with fiberglass batt insulation, 5/8”
gypsum wall board, and brick tiles attached to concrete backer board for an effective R-value of R-16.7.
The walls surrounding the multipurpose room, kitchen, and mechanical room were constructed using 8”
metal studs on 16” centers with 8” fiberglass batts, 5/8” gypsum wall board, and brick tiles over concrete
backer board yielding an effective R-value of R-21. Wall heights in most of the building are 11’-4” high.
This wall height accounts for a suspended ceiling concealing ductwork and mechanical heating
equipment. There are areas in the building with taller exterior walls; the fan room wall height is 32’-8”,
the gym wall is 32 feet high, and the multipurpose wall height is 18’-11”. There is approximately 26,397
sf of above-grade exterior wall area for the school.
Floor construction for the school is 4” thick, reinforced, concrete slab on grade with two inches of rigid
edge insulation (R-10) extending to an estimated two feet below grade. There is approximately 58,528 sf
of slab on grade floor area for the school building and an additional 3,476 sf of floor area for the second
story fan penthouse areas. The total floor area for the school is 62,004 sf.
The roof is ventilated and gabled with a 3.5/12 pitch and consists of a metal deck overlay, 1/2” moisture
resistant gypsum wall board, a vapor barrier, 4” thick composite insulation board, a self adhering,
modified bitumen ice shield, and composite shingles for an effective R-value of R-23. The gymnasium,
library, and fan room have an inverted roof membrane assembly consisting of a metal deck, an estimated
4” of fiberboard insulation, and a single-ply waterproof membrane under concrete pavers. The total area
for the inverted roof membrane assembly is 15,550 sf with an estimated R-value of R-18. There is
approximately 60,333 sf of roof area for the school.
Typical window construction for the school consists of double pane, clear glass with a 3/4 inch air space
between the panes and an aluminum frame with a thermal break. An effective insulating value of R-1.6
was given to all windows in the school. There is approximately 700 sf of south-facing window area and
1,200 sf of other window area.
The majority of the exterior man doors in the school are insulated hollow metal doors with an effective R-
value of R-2.5. There are four entryway doors that are hollow metal with insulated cores (R-5.3) and four
entryway doors that are hollow metal with insulated cores and half lite windows (R-2.2). The outside
storage room adjacent to the mechanical room has an insulated overhead sectional door with an R-value
of R-2.6. All of the doors were installed during the original construction, have weather stripping in fair to
poor condition, and are approximately 11 years old.
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V.II Mechanical Description
The school is heated with three Weil-McLain BG-788 series gas fired boilers with an output of
2,049MBH each that deliver heat to perimeter hydronic baseboards, small unit heaters, and hydronic coils
in air handling units (AHUs). The boilers were installed in 2000 during original construction and are each
equipped with a Gordon-Piatt burner, model R8.3-15. A boiler circulation pump is provided for each
boiler. The heating system medium is water. Ventilation heating is provided by heating coils using glycol,
which is heated by the central heating system using a water-to-glycol heat exchanger located in the fan
room. No mechanical cooling is provided for any systems in the facility.
An A.O. Smith, model BTP199-104, gas fired water heater with an 81 gallon storage tank and input rating
of 199 MBH is used to provide hot water for the school and kitchen area. The domestic water line has hot
water recirculation which uses a Grundfos, UP25-645F, bronze in-line circulator pump.
There are four AHUs in the building that are controlled by a Siemens Direct Digital Control (DDC)
system. AHU-1 is comprised of dual horizontal draw-through 44” diameter plug fans. AHU-1 serves the
majority of the school spaces using two 30 HP fans that, combined, provide 56,500 standard cubic feet
per minute (scfm) of conditioned air. AHU-2, also a horizontal draw through fan unit, has a 7.5 HP fan
that provides conditioned air to the multipurpose room, music office, and stage at 11,670 scfm. AHU-3
serves the gymnasium and operates with a 5 HP fan providing tempered air at 7,900 scfm. AHU-4
provides conditioned air to the server room located in the fan room. It is a horizontal draw through
cabinet fan with a 1/3 HP fan, mixing box, and DDC controlled dampers that mix outside air with return
air for preconditioning.
V.III Electrical Description
The school is served by a 2000 amp (A), 120/208 volt (V), three phase, 4-wire, underground electrical
service connected to a pad mounted utility transformer. The school has a 125 kilowatt standby diesel
generator used to power selected loads in the event of a power outage. Standby power is distributed
through two automatic transfer switches to two distribution panels, a 600A transfer switch for standby
loads and a 60A transfer switch for emergency loads. The emergency load transfer switch will transfer
loads from utility to standby power within 10 seconds of detecting a power outage and the transfer switch
will transfer loads within 30 seconds. Emergency loads include the emergency egress lights.
Most fluorescent light fixtures in the school utilize T8 lamps and electronic ballasts. 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). T12 light fixtures are present in the
portable classrooms. Occupancy sensors are used in many locations throughout the school to control light
fixtures. These areas include but are not limited to the classrooms, multipurpose room, and some offices.
The corridors feature exposed beams that run perpendicular to the corridor from wall to wall beneath a
peaked roof. Most of the corridor lighting is provided from these beams by 1'x4' lensed troffer down
lights with two T8 lamps, and 4' single lamp T8 strip up lights illuminating the ceiling from the top of the
beams.
Incandescent light fixtures were observed in two locations in the school. One fixture was located in a
mechanical room, and one other fixture was located in the library office as a desk lamp.
The Gymnasium was originally illuminated with several 400 watt (W) high bay metal halide light fixtures
that have been replaced by four lamp fluorescent T5HO light fixtures. The number of light fixtures was
reduced from 18 fixtures to 12 fixtures during the replacement.
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Exterior lighting consists of 70W metal halide (MH) canopy lights, 100W MH wall pack lights and 400W
high pressure sodium (HPS) pole mounted parking lot lights. All of the exterior lights are controlled by an
on-off photo sensor that switches the light fixtures off during the day. The parking lot lights are also
controlled by an input from the security system to shut them off while the building security system is
armed.
Emergency egress lights are present throughout the building for safety. The record drawings were used to
provide a count of the number of night lights present. Approximately 20% of the down lights in the
corridors, four fixtures in the gymnasium, and a small number of fixtures in the offices are powered from
the emergency panel and are illuminated 24 hours a day.
Other electricity-using equipment not previously described in the mechanical or electrical sections include
a microwave, electric ranges, other various kitchen equipment, and various user equipment such as
projectors, computers, and printers.
V.IV Portable Buildings Description
There are two on site portables located on the Muldoon Elementary School campus. They are occupied
from 7 a.m. until 3:30 p.m. on weekdays during the school year. One portable was constructed in 1992
while the other was constructed in 1968. The portable buildings were similarly constructed with 2”x4”
wood stud walls on 16” centers with R-11 fiberglass batt insulation. The exterior face of the wall is T1-11
siding with drywall on the interior for a composite wall insulation value of R-10.6. The exterior wall
heights are nine feet high to the roof eaves and extend to 11 feet at the roof peak in the center of the end
walls. Each portable has approximately 1,664 sf of exterior wall area.
The portables have above-grade floors resting on sleepers. Plywood skirting protects the sleepers and
floor construction from the weather. The floors are constructed of plywood flooring resting on 2”x8”
wood joists. It is estimated that the floor has R-19 fiberglass batt insulation for a composite floor
insulation value of R-20.1. Each portable has approximately 960 sf of floor area.
The portables are both covered by a sloped roof to achieve a ventilated cold roof design. Each roof has
shingles applied to a plywood decking. It is estimated that each roof is insulated with R-19 fiberglass
batts. Each portable has approximately 1,012 sf of roof area.
There are two single pane, wood framed windows in each portable with an estimated R-value of R-1.1.
There are two insulated metal doors in each portable with an effective R-value of R-1.7.
Both portables are heated with electric resistance perimeter baseboards and electric unit heaters. The
electric baseboard temperature set point is manually controlled by a dial thermostat on each individual
baseboard. This makes it easy for the electric baseboards to be left on and utilized at higher than
necessary temperatures. Due to the need to keep these buildings moveable and due to combustion safety
issues, the ASD states its desire to keep all portable buildings on electric heat and not utilize natural gas
heating at this time.
An overhead electric feeder is routed from the school to a small distribution panel in each of the portable
buildings to distribute power to the electric loads including the unit heater, base board heaters, receptacles
and the portable lighting. The lighting in the portables consists of fluorescent T12 light fixtures.
Due to the fact that the two on-site portables have similar building envelope construction and heating
equipment, only one AkWarm model was created that models a single portable building. The results and
recommended ECMs generated by this single portable AkWarm model should be applied to both of the
portable buildings. The portable was modeled separately from the main school building AkWarm model.
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See Appendix D, Energy Conservation Measures, for details of each recommended ECM for the portable
buildings.
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VI. Historic Energy Consumption and Cost
Tables provided in Appendix A, Energy Benchmark Data Report, represent the electric and natural gas
energy usage for the surveyed facility from January 2009 to December 2010. Chugach Electric provides
the electricity and Enstar Natural Gas provides the natural gas to the building. Both utility companies bill
the facility using a commercial rate schedule. The actual utility bills were not provided to be able to verify
the data received to assure 100 percent accuracy of the data.
The AkWarm model of the facility was built to match the facility’s average annual electric and natural
gas consumption to create realistic energy comparisons. 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 surcharges, 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, 100 watt lamp
operating for 10 hours. One kWh is equivalent to 3,413 BTU. Utility data used in this report reflects the
historical data provided for the building in a summarized format.
VI.II Natural Gas Consumption Data
The natural gas utility measures consumption and bills in CCF of natural gas; where one CCF equals 100
cubic feet of natural gas. The average heating value of natural gas is 1,000 BTUs per cubic foot, making 1
CCF equal to 100,000 BTUs or 1 Therm.
VI.III Overall Energy Consumption Data
The overall cost for energy use is calculated by dividing the total cost by the total usage. Based on the
electric and natural gas 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 Rate 0.14 $/kWh 0.12 $/kWh 0.13 $/kWh
Natural Gas Rate 1.00 $/CCF 0.85 $/CCF 0.93 $/CCF
Total Cost $149,851 $124,362 $137,067
ECI 2.34 $/sf 1.95 $/sf 2.14 $/sf
Electric EUI 28.4 kBtu/sf 29.5 kBtu/sf 29.0 kBtu/sf
Natural Gas EUI 118.2 kBtu/sf 111.3 kBtu/sf 114.8 kBtu/sf
Building EUI 146.6 kBtu/sf 140.8 kBtu/sf 143.7 kBtu/sf
The Energy Cost Index (ECI) is derived by dividing the annual cost by the school campus square footage.
The school campus square footage was calculated to be approximately 63,924 square feet. This area
includes the main building in addition to the fan room and the two portable buildings.
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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 E.
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VIII. Energy Conservation Measures
VIII.I School Building ECMs
ECM# MES-0 – Replace Refrigerators Older than 5 years Old
Annual Energy Savings Installed Cost SIR Payback (years)
---<10 years
Due to recent advances in refrigerators in the last five years, new Energy Star refrigerators are
significantly more efficient than previous models. 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# MES-1 – Shutdown Boilers During Summer Months
Annual Energy Savings Installed Cost SIR Payback (years)
$1,472 $720 32.85 0.5
The three gas fired boilers in the building operate year-round, even during the summer when limited
heating needs are required. By turning off the boilers from June to the end of August, energy savings can
be achieved. ASD has had trouble with older generation grooved joint couplings when subjected to cyclic
heating and cooling from seasonal shutdowns. However, due to the fact that the hydronic piping in
Muldoon Elementary does not contain grooved-joint couplings, leaks should not be an issue when boilers
are shut down seasonally. The maintenance cost of a trained technician restarting the boilers was included
as in the installed cost, but no capital cost is required. This ECM was modeled with a separate AkWarm
model and as a result, the item is not an additive measure in AkWarm. It is therefore not included in the
final cost savings total in the final AkWarm model in Appendix D.
ECM # MES-2– Setback Thermostat in all Building Spaces
Annual Energy Savings Installed Cost SIR Payback (years)
$11,846 $792 12.72 0
Significant energy savings exist by reducing the room temperature of the building spaces during
unoccupied times. Reducing the temperature to 60F during unoccupied times will lower the heat load of
the building and reduce natural gas consumption. Since the school’s thermostats are already connected to
the DDC system, the cost of this ECM only includes the time required to program a night setback which
can be performed by maintenance personnel. This ECM is a compilation of items 1, 2, and 3 as modeled
in AkWarm which are intended to be implemented concurrently. Details of the individual items are shown
in Appendix D.
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ECM # MES-3 – Upgrade Mechanical Room lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$115 $500 3.54 4.3
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 off. These lights should be re-wired to be controlled by the local
lighting circuit, and have their function as emergency lights replaced by "bug-eye" type battery backed
emergency lights. See item 5 in Appendix D for further details.
ECM # MES-4 – Upgrade Lighting and Controls in the Offices
Annual Energy Savings Installed Cost SIR Payback (years)
$333 $1,530 3.27 4.6
The office spaces in the school are primarily illuminated by T8 light fixtures with electronic ballasts. The
lighting in several of these offices are currently controlled by occupancy sensors, however approximately
10 of these office spaces do not have occupancy sensors for control. It is recommended that 10 ceiling
mounted occupancy sensors are installed to control approximately (16) 2-lamp, (3) 3-lamp, and (24) 4-
lamp fluorescent T8 light fixtures. Additionally there was a single incandescent desk lamp observed that
should be re-lamped with a compact fluorescent lamp (CFL). It is not recommended to re-wire the
existing light fixtures powered by the emergency electrical distribution panel as part of this ECM.
This description compiles measures 4, 7, 8, and 11 which were individually modeled in AkWarm. See
appendix D for details of individual measures.
ECM # MES-5 – Upgrade Corridor Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$833 $5,250 2.44 6.3
There are approximately (21) 4' 2-lamp T8 fluorescent troffer light fixtures that are currently being used
as night lights in the corridors and are never switched off. These lights should be re-wired to be controlled
by the local lighting circuit, and have their function as emergency lights replaced by approximately (21)
"bug-eye" type battery backed emergency lights. Additional savings exist by controlling the light fixtures
in the corridors with ocupancy sensors, however, the use of occupancy sensors was not modeled in
AkWarm, and the cost of this upgrade is not included in this ECM. See items 6 and 9 in Appendix D for
further details.
ECM # MES-6 – Install Exhaust Stack Economizer
Annual Energy Savings Installed Cost SIR Payback (years)
$2,788 $21,000 2.13 7.5
Installing one exhaust stack economizer on the combined exhaust stack of the three existing gas fired
boilers will recover heat from exhaust gases. An exhaust stack economizer utilizes a fan and heat
exchanger to transfer heat from exhaust gases to the hydronic system, increasing the efficiency of the
heating system by approximately 5 or 6%. See item 10 in Appendix D for more details of this measure.
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ECM # MES-7 – Upgrade Library Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$7 $60 1.69 8.6
There are two incandescent lamps present in the library that should be replaced by spiral compact
fluorescent lamps (CFL). See item 13 in Appendix D for more information.
ECM # MES-8 – New EC Pumps for P-3, 4, and 5
Annual Energy Savings Installed Cost SIR Payback (years)
$502 $4,974 1.52 9.9
The three existing circulation pumps (P-3, 4, and 5) are constant speed pumps. 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 $11,385 replacement cost with an annual energy savings of $502, and a simple payback of 22.7 years.
However, upgrading to pumps with EC motors when the existing pumps fail and are in need of repair will
offer a more reasonable payback because the marginal cost of the high efficiency EC motor over the
standard replacement is only a $4,974 repair cost. This repair cost offers a simple payback of 9.9 years,
resulting in an SIR of 1.52. The repair upgrade is recommended as it is the most cost effective option.
This ECM was modeled with a separate AkWarm model and as a result the item is not an additive
measure in AkWarm. It is therefore not included in the final cost savings total in the final AkWarm model
in Appendix D.
ECM # MES-9 – Upgrade the Exterior Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$1,680 $17,000 1.52 10.1
The exterior lighting at the site consists of (29) 70W MH canopy lights, (23) 100W MH wall packs, (10)
400W HPS pole mounted "shoebox" type area lighters, and (6) 400W HPS pole mounted twin head
"shoebox" area lighters. All of the exterior lighting is controlled by contactors, mounted in the boiler
room, which are controlled by a signal from the DDC system that turns on the lights based on an input
from a central photocell. Additionally, the parking lot lights are controlled by an input from the DDC
system that shuts them off while the security system is alarmed, however the building mounted light
fixtures remain on all night. This ECM would replace the wallpack and canopy light fixtures with 50W
and 35W LED light fixtures respectively. This assumes the re-use of wiring.
Upgrading the parking lot HPS light fixtures was evaluated, however due to the fact that these lights have
a night shut off replacing them with LED fixtures did not prove to be cost effective.
This description compiles measures 12 and 14 which were individually modeled in AkWarm. See
appendix D for details of individual measures.
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ECM # MES-10 – Air Tightening
Annual Energy Savings Installed Cost SIR Payback (years)
$2,479 $22,000 1.02 8.9
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
natural gas being burned by the boilers. While a blower door test was not completed, it is anticipated that
air leakage is occurring through 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. Also, inspect and repair louvers and
dampers within each AHU. To achieve a viable economic benefit, up to $22,000 can be invested and still
achieve an SIR ≥ 1 by reducing air leakage by 20%. See item 15 in Appendix D for more information.
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VIII.II Portable Building ECMs
ECM #PB-1 – Add Insulation to Portable Skirting
Annual Energy Savings Installed Cost SIR Payback (years)
$1,036 $1,624 13.20 1.6
The Portable has uninsulated plywood skirting which protects the above grade floor from the weather.
The skirting is estimated to have an R-value of R-3.0. Installing R-15 rigid insulation to the interior side
of the portable skirting will reduce heat loss and reduce electricity consumption. See item PB-1 in
Appendix D for more information.
ECM #PB-2 – Setback Thermostat
Annual Energy Savings Installed Cost SIR Payback (years)
$565 $1,000 6.93 1.8
Significant energy savings exist by reducing the room temperature of the portable building during
unoccupied times. However, due to the fact that the portable building has perimeter electric baseboard
heaters, each with individual dial thermostats, it is difficult to obtain a desired set point in the portable
building. As a result, the temperature in the portable is typically much higher than required. Also, the
temperature cannot be set back during unoccupied times. It is recommended that a central programmable
thermostat be installed in the portable building that can turn the perimeter electric baseboards on or off to
control occupied and unoccupied temperature set points. Reducing the portable temperature from 65F to
60F during unoccupied times will save $565 annually in electricity bills. See item PB-2 in Appendix D
for more information.
ECM #PB-3 – Add Roof Insulation
Annual Energy Savings Installed Cost SIR Payback (years)
$299 $1,943 3.18 6.5
Adding additional R-19 fiberglass batt insulation to the roof of the portable to make an R-38 roof may be
feasible during the next scheduled roof replacement. Installing an additional layer of R-19 insulation will
save approximately $268 per year, with an installed cost of $1,943 if completed in combination with the
roof replacement. See item PB-3 in Appendix D for more information.
ECM #PB-5 – Replace Exterior Doors
Annual Energy Savings Installed Cost SIR Payback (years)
$93 $781 2.47 8.4
The portable building has two poorly insulated (R-1.7) metal doors. It is recommended that both doors be
removed and replaced with new R-6.25 minimum (U-0.16) insulated doors. The new doors should have
proper weather stripping on them to reduce air infiltration. See item PB-4 in Appendix D for more
information.
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ECM #PB-6 – Replace Lighting in the Portable Building
Annual Energy Savings Installed Cost SIR Payback (years)
$38 $500 1.16 13.3
The portable is currently illuminated by T12 fluorescent light fixtures with magnetic and electronic
ballasts. These fixtures should be replaced with T8 light fixtures with programmable start ballasts and
controlled by a ceiling mounted occupancy sensor. Refer to item PB-5 in Appendix D for more
information.
ECM #PB-7– Seal Building Envelope and Reduce Infiltration by 30%
Annual Energy Savings Installed Cost SIR Payback (years)
$116 $950 1.07 8.2
By tightening the portable building envelope with air sealing improvements, infiltration into the portable
will be reduced. This in turn will reduce the heating load and reduce the amount of electricity being used
by the electric heaters. While a blower door test was not completed, it is anticipated that air leakage is
occurring around old weather stripping around doors, window frames, and wall and roof penetrations.
Methods to decrease the infiltration into the portable 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 $950 can be
invested and still achieve an SIR ≥ 1 by reducing air leakage by 30%. See item PB-6 in Appendix D for
more information.
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VIII.III Administrative Controls for Energy Conservation and Optimization
While the intent of many energy conservation measures is to increase the efficiency of fuel-burning and
electrical equipment, an important factor of energy consumption lies in the operational profiles which
control the equipment usage. Such profiles can be managed by administrative controls and departmental
leadership. They determine how and when fuel-burning and electrical equipment are used, and therefore
have a greater impact on energy savings potential than simply equipment upgrades alone. Significant
energy cost savings can be realized when ECMs are combined with efficient-minded operational profiles.
Operational profiles may be outlined by organization policy or developed naturally or historically. These
profiles include, but are not limited to: operating schedules, equipment setpoints and control strategies,
maintenance schedules, and site and equipment selection.
Optimization of operational profiles can be accomplished by numerous methods so long as the intent is
reduction in energy-using equipment runtime. Due to the numerous methods of optimization, energy cost
savings solely as a result of operational optimization are difficult to predict. Quantification, however, is
easy to accomplish by metering energy usage during and/or after implementation of energy-saving
operational profiles and ECMs. Shown below are some examples which have proven successful for other
organizations.
Optimization of site selection includes scheduling and location of events. If several buildings in a given
neighborhood are all lightly used after regularly occupied hours, energy savings can be found when after-
hours events are consolidated and held within the most energy efficient buildings available for use. As a
result, unoccupied buildings could be shut down to the greatest extent possible to reduce energy
consumption.
Two operational behaviors which can be combined with equipment upgrades are operating schedules and
equipment control strategies including setpoints. Occupancy and daylight sensors can be programmed to
automatically shut off or dim lighting when rooms are unoccupied or sufficiently lit from the sun.
Operating schedules can be optimized to run equipment only during regular or high-occupancy periods.
Also, through a central control system, or with digital programmable thermostats, temperature setpoints
can be reduced during low-occupancy hours to maximize savings. In addition, sporadically used
equipment can be shut down during unoccupied hours to further save energy. In general, having
equipment operating in areas where no occupants are present is inefficient, and presents an opportunity
for energy savings.
Operational profiles can also be implemented to take advantage of no- or low-cost ECMs. Examples
include heating plant optimizations (boiler section cleaning, boiler flush-through cleaning) and tighter
controls of equipment setbacks and shutdowns (unoccupied zones equipment shutdown, easier access to
and finer control of equipment for after-hours control). In a large facility management program,
implementation of these measures across many or all sites will realize dramatic savings due to the
quantity of equipment involved.
Changes to building operational profiles can only be realized while simultaneously addressing health,
safety, user comfort, and user requirements first. It is impractical to expect users to occupy a building or
implement operational behaviors which do not meet such considerations. That said, it is quite practical for
management groups to implement administrative controls which reduce losses brought about by excess
and sub-optimum usage.
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Appendix A
Energy Benchmark Data
First Name Last Name Middle Name Phone
Steven Golab 348‐5132
State Zip
AK
Monday‐Friday Saturday Sunday Holidays
8‐4:30
Average # of
Occupants
During
Renovations
Date
1966
1967
1972
Details
DateFacility Owned By
63,924
Year Built
Facility Address
Muldoon Elementary
City
261,500
REAL Preliminary Benchmark Data Form
PART I – FACILITY INFORMATION
Facility Owner
MOA
Building Name/ Identifier
Building Type
Building Usage Building Square Footage
4328 SF Classrooms
Facility City
Anchorage
23985 SF Original Structure
Education ‐ K ‐ 12
99517
Email
Anchorage
Facility Zip
Golab_Steven@asdk12.org
4994 SF MPR
Mailing Address
525 Cherry St
Contact Person
07/22/11
Primary
Operating
Hours
2000Mixed
Community Population
Municipal
1972
1987
1988
1998
2000
PART II – ENERGY SOURCES
Heating Oil Electricity Natural Gas Propane Wood Coal
$ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton
Other energy
sources?
4415 SF Gym
61599 SF Replacement School
2448 SF IMC
1. Please check every energy source you use in the table below. If known, please enter the base rate you
pay for the energy source.
2. Provide utilities bills for the most recent two‐year period for each energy source you use.
(-40170 SF) Demolistion
4994 SF MPR
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Muldoon Elementary
Buiding Size Input (sf) =63,924
2009 Natural Gas Consumption (Therms)75,559
2009 Natural Gas Cost ($)75,559
2009 Electric Consumption (kWh)532,306
2009 Electric Cost ($)74,292
2009 Total Energy Use (kBtu)9,372,660
2009 Total Energy Cost ($)149,851
Annual Energy Use Intensity (EUI)
2009 Natural Gas (kBtu/sf) 118.2
2009 Electricity (kBtu/sf)28.4
2009 Energy Utilization Index (kBtu/sf)146.6
Annual Energy Cost Index (ECI)
2009 Natural Gas Cost Index ($/sf)1.18
2009 Electric Cost Index ($/sf)1.16
2009 Energy Cost Index ($/sf)2.34
2010 Natural Gas Consumption (Therms)71,174
2010 Natural Gas Cost ($)60,676
2010 Electric Consumption (kWh)552,485
2010 Electric Cost ($)63,686
2010 Total Energy Use (kBtu)9,003,031
2010 Total Energy Cost ($)124,362
Annual Energy Use Intensity (EUI)
2010 Natural Gas (kBtu/sf)111.3
2010 Electricity (kBtu/sf)29.5
2010 Energy Utilization Index (kBtu/sf)140.8
Annual Energy Cost Index (ECI)
2010 Natural Gas Cost Index ($/sf)0.95
2010 Electric Cost Index ($/sf)1.00
20010 Energy Cost Index ($/sf)1.95
Note:
1 kWh = 3,413 Btu's
1 Therm = 100,000 Btu's
1 CF ≈ 1,000 Btu's
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Muldoon Elementary SchoolDraft Energy Audit ReportMuldoon ElementaryNatural GasBtus/CCF =100,000Provider Meter # Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)Enstar NGC726 Jan-09 01/13/09 02/11/09 29 9,7749,774$9,861$1.01Enstar NGC726 Feb-09 02/11/09 03/12/09297,5557,555$7,634$1.01Enstar NGC726 Mar-09 03/12/09 04/14/09337,5517,551$7,631$1.01Enstar NGC726 Apr-09 04/14/09 05/12/09286,5326,532$6,610$1.01Enstar NGC726 May-09 05/12/09 06/12/09315,4865,486$5,565$1.01Enstar NGC726 Jun-09 06/12/09 07/14/09323,9153,915$3,986$1.02Enstar NGC726 Jul-09 07/14/09 08/13/09303,4833,483$3,558$1.02Enstar NGC726 Aug-09 08/13/09 09/14/09323,8363,836$3,911$1.02Enstar NGC726 Sep-09 09/14/09 10/13/09295,0085,008$5,086$1.02Enstar NGC726 Oct-09 10/13/09 11/11/09296,7106,710$6,799$1.01Enstar NGC726 Nov-09 11/11/09 12/09/09287,7277,727$7,819$1.01Enstar NGC726 Dec-09 12/09/09 01/12/10347,9827,982$7,099$0.890Enstar NGC726 Jan-10 01/12/10 02/11/10307,7597,759$6,482$0.84Enstar NGC726 Feb-10 02/11/10 03/12/10296,8986,898$5,768$0.84Enstar NGC726 Mar-10 03/12/10 04/14/10336,6556,655$5,599$0.84Enstar NGC726 Apr-10 04/14/10 05/12/10285,8875,887$4,982$0.85Enstar NGC726May-1005/12/1006/10/10295,3005,300$4,498$0.85Enstar NGC726May-1005/12/1006/10/10295,3005,300$4,498$0.85Enstar NGC726 Jun-10 06/10/10 07/12/10324,1684,168$3,546$0.85Enstar NGC726 Jul-10 07/12/10 08/12/10313,7033,703$3,264$0.88Enstar NGC726 Aug-10 08/12/10 09/13/10324,0114,011$3,563$0.89Enstar NGC726 Sep-10 09/13/10 10/13/10305,0985,098$4,429$0.87Enstar NGC726 Oct-10 10/13/10 11/09/10276,3736,373$5,496$0.86Enstar NGC726 Nov-10 11/09/10 12/09/10307,0117,011$5,982$0.85Enstar NGC726 Dec-10 12/09/10 01/12/11348,3118,311$7,067$0.85Jan - 09 to Dec - 09 total:75,55975,5590.00$75,559$0Jan - 10 to Dec - 10 total:71,17471,1740.00$60,676$0$1.00$0.86Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Coffman Engineers, Inc.AkWarm No. CIRI!ANC!CAEC!06Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-06 Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Muldoon Elementary SchoolDraft Energy Audit Report$6,000 $8,000 $10,000 $12,000 6,0008,00010,00012,000Natural Gas Cost ($)Natural Gas Consumption (Therms)Muldoon Elementary - Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)Natural Gas Consumption (Therms)$0 $2,000 $4,000 02,0004,000Natural Gas Consumption (Therms)Date (Mon - Yr)Natural Gas Consumption (Therms)Natural Gas Cost ($)Coffman Engineers, Inc.AkWarm No. CIRI!ANC!CAEC!06Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-06 Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Muldoon Elementary SchoolDraft Energy Audit ReportMuldoon ElementaryElectricityBtus/kWh =3,413Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)CEA 1241-38100250 Jan-09 1/8/2009 2/9/20093253,5161,827178$8,374$0.160CEA 1241-38100250 Feb-09 2/9/2009 3/11/20093048,0531,640177$7,519$0.160CEA 1241-38100250 Mar-09 3/11/2009 4/9/20092951,6391,762172$7,823$0.150CEA 1241-38100250 Apr-09 4/9/2009 5/8/20092949,1011,676162$7,270$0.150CEA 1241-38100250 May-09 5/8/2009 6/9/20093239,5281,349164$6,187$0.160CEA 1241-38100250 Jun-09 6/9/2009 7/9/20093021,461732164$3,218$0.150CEA 1241-38100250 Jul-09 7/9/2009 8/7/20092922,291761103$3,184$0.140CEA 1241-38100250 Aug-09 8/7/2009 9/8/20093239,0611,333166$5,292$0.140CEA 1241-38100250 Sep-09 9/8/2009 10/7/20092949,1521,678166$6,252$0.130CEA 1241-38100250 Oct-09 10/7/2009 11/6/20093055,0321,878167$6,796$0.120CEA 1241-38100250 Nov-09 11/6/2009 12/8/20093253,5161,827170$6,516$0.120CEA 1241-38100250 Dec-09 12/8/2009 1/7/20103049,9561,705170$5,861$0.120CEA 1241-38100250 Jan-10 1/7/2010 2/8/20103248,1241,642159$5,470$0.110CEA 1241-38100250 Feb-10 2/8/2010 3/10/20103051,8871,771166$5,670$0.110CEA 1241-38100250 Mar-10 3/10/2010 4/9/20103053,8931,839166$6,144$0.110CEA 1241-38100250 Apr-10 4/9/2010 5/11/20103247,8731,634157$5,594$0.120CEA1241-38100250May-105/11/20106/10/20103042,4211,448157$5,213$0.120CEA1241-38100250May-105/11/20106/10/20103042,4211,448157$5,213$0.120CEA 1241-38100250 Jun-10 6/10/2010 7/12/20103231,2071,065149$3,975$0.130CEA 1241-38100250 Jul-10 7/12/2010 8/10/20102928,307966131$3,538$0.120CEA 1241-38100250 Aug-10 8/11/2010 9/11/20103138,7851,324160$4,670$0.120CEA 1241-38100250 Sep-10 9/12/2010 10/10/20102847,1791,610160$5,465$0.120CEA 1241-38100250 Oct-10 10/11/2010 11/12/20103251,8051,768166$5,755$0.110CEA 1241-38100250 Nov-10 11/13/2010 12/9/20102655,2241,885166$6,048$0.110CEA 1241-38100250 Dec-10 12/10/2010 1/10/20113155,7801,904168$6,144$0.110Jan - 09 to Dec - 09 total:532,30618,1681,959$74,2920Jan - 10 to Dec - 10 total:552,48518,8561,905$63,6860$0.14$0.12Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Coffman Engineers, Inc.AkWarm No. CIRI!ANC!CAEC!06Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-06 Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Muldoon Elementary SchoolDraft Energy Audit Report$4,000$5,000$6,000$7,000$8,000$9,00030,00040,00050,00060,000Electric Cost ($)Electric Consumption (kWh)Muldoon Elementary - Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)$0$1,000$2,000$3,000010,00020,000Date (Mon - Yr)Coffman Engineers, Inc.AkWarm No. CIRI!ANC!CAEC!06Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-06 Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Appendix B
AkWarm Commercial Reports
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Elementary School
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 1/26/2012 10:28 AM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Muldoon ES Auditor Company: Coffman Engineers, Inc.
Address: 525 Cherry St Auditor Name: Walter Heins PE, CCP, CxA, CEA
City: Anchorage Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Calvin Mundt
Client Address: Auditor Phone: (907) 276-6664
Auditor FAX:
Client Phone: (907) 742-5213 Auditor Comment:
Client FAX:
Design Data
Building Area: 62,004 square feet Design Heating Load: Design Loss at Space: 2,435,944
Btu/hour
with Distribution Losses: 2,706,605 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency and
25% Safety Margin: 4,125,922 Btu/hour
Note: Additional Capacity should be added for DHW load,
if served.
Typical Occupancy: 500 people Design Indoor Temperature: 70 deg F (building average)
Actual City: Anchorage Design Outdoor Temperature: -18 deg F
Weather/Fuel City: Anchorage Heating Degree Days: 10,816 deg F-days
Utility Information
Electric Utility: Chugach Electric - Commercial - Sm Natural Gas Provider: Enstar Natural Gas - Commercial -
Sm
Average Annual Cost/kWh: $0.130/kWh Average Annual Cost/ccf: $0.930/ccf
Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06 Elementary School Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Other Electrical Cooking Clothes Drying Vent Fans Service Fees Total Cost Existing Building $74,067 $0 $3,937 $27,494 $17,246 $0 $0 $9,480 $0 $132,223 With Proposed Retrofits $55,102 $0 $3,937 $23,485 $17,246 $0 $0 $9,480 $0 $109,249 SAVINGS $18,965 $0 $0 $4,009 $0 $0 $0 $0 $0 $22,974
Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06 Elementary School $0$20,000$40,000$60,000$80,000$100,000$120,000$140,000Existing RetrofitVentilation and FansSpace HeatingOther ElectricalLightingDomestic Hot WaterAnnual Energy Costs by End Use$0$10,000 $20,000 $30,000 $40,000 $50,000FloorWall/DoorWindowCeilingAirExistingRetrofitAnnual Space Heating Cost by Component
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06 Elementary School Annual Modeled Consumption (Blue) compared to Actual Electric (Left) and Natural Gas (Right) Consumption (Orange). Muldoon Elementary School Final Energy Audit Report
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06 Monthly Modeled Consumption (Blue) compared to Actual Electric Consumption (Orange). Muldoon Elementary School Final Energy Audit Report
Bear Valley Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06 Monthly Modeled Consumption (Blue compared to Actual Natural Gas Consumption (Orange).Muldoon Elementary School Final Energy Audit Report
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Portable Buildings
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 1/16/2012 2:27 PM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Muldoon ES - Portable Building Auditor Company: Coffman Engineers, Inc.
Address: 525 Cherry Street Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Anchorage Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Calvin Mundt
Client Address: Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-5042
Client Phone: (907) 742-5213 Auditor Comment:
Client FAX:
Design Data
Building Area: 960 square feet. This is the area for one
portable. There are two portables on site for a total of
1920 square feet.
Design Heating Load: Design Loss at Space: 38,822
Btu/hour
with Distribution Losses: 38,822 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency and
25% Safety Margin: 59,180 Btu/hour
Note: Additional Capacity should be added for DHW load,
if served.
Typical Occupancy: 25 people Design Indoor Temperature: 70 deg F (building average)
Actual City: Anchorage Design Outdoor Temperature: -18 deg F
Weather/Fuel City: Anchorage Heating Degree Days: 10,816 deg F-days
Utility Information
Electric Utility: Chugach Electric - Commercial - Sm Natural Gas Provider: Enstar Natural Gas - Commercial -
Sm
Average Annual Cost/kWh: $0.130/kWh Average Annual Cost/ccf: $0.000/ccf
Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06 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 $3,655 $0 $0 $712 $309 $0 $0 $0 $0 $4,677 With Proposed Retrofits $983 $0 $0 $714 $309 $0 $0 $0 $0 $2,007 SAVINGS $2,672 $0 $0 -$2 $0 $0 $0 $0 $0 $2,670
Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06 Portable Buildings
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Appendix C
Major Equipment List
Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) B-1 BOILER RM BUILDING HEATING WEIL-MCLAIN BG-788-W CAST IRON GAS FIRED 2049 MBH ≈ 80% 1.5 30 ≈ 19 B-2 BOILER RM BUILDING HEATING WEIL-MCLAIN BG-788-W CAST IRON GAS FIRED 2049 MBH ≈ 80% 1.5 30 ≈ 19 B-3 BOILER RM BUILDING HEATING WEIL-MCLAIN BG-788-W CAST IRON GAS FIRED 2049 MBH ≈ 80% 1.5 30 ≈ 19 P-1 BOILER RM HEATING WATER CIRC ARMSTRONG 4030 BASE MOUNTED CENTRIFUGAL 275GPM 70' ≈ 98% 10 20 9 P-2 BOILER RM HEATING WATER CIRC ARMSTRONG 4030 BASE MOUNTED CENTRIFUGAL 275GPM 70' ≈ 98% 10 20 9 P-3 BOILER RM BOILER CIRC ARMSTRONG 1000-2B INLINE 95GPM 20' ≈ 86.5% 1 10 0 P-4 BOILER RM BOILER CIRC ARMSTRONG 1000-2B INLINE 95GPM 20' ≈ 86.5% 1 10 0 P-5 BOILER RM BOILER CIRC ARMSTRONG 1000-2B INLINE 95GPM 20' ≈ 86.5% 1 10 0 P-6 BOILER RM BOILER RECIRC ARMSTRONG S35 INLINE 28GPM 10' ≈ 86.5% 1/6 10 0 P-7 BOILER RM BOILER RECIRC ARMSTRONG S35 INLINE 28GPM 10' ≈86.5% 1/6 10 0 P-8 BOILER RM BOILER RECIRC ARMSTRONG S35 INLINE 28GPM 10' ≈86.5% 1/6 10 0 P-9 FAN RM GLYCOL SYSTEM CIRC ARMSTRONG 3D INLINE 140GPM 40' ≈86.5% 3 10 0 P-10 FAN RM GLYCOL SYSTEM CIRC ARMSTRONG 3D INLINE 140GPM 40' ≈86.5% 3 10 0
Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) P-11 BOILER RM DOMESTIC HOT WATER RECIRC GRUNDFOS UP25-645F INLINE 5GPM 17' ≈ 86.5 125W 10 0 R-1 FAN RM BLDG RELIEF GREENHECK SPD-CA-36 PROPELLER 11,930CFM NEMA STANDARD 1.5 25 14 R-2 FAN RM BLDG RELIEF GREENHECK SPD-CA-36 PROPELLER 11,930CFM NEMA STANDARD 1.5 25 14 R-3 FAN RM BLDG RELIEF GREENHECK SPD-CA-36 PROPELLER 11,930CFM NEMA STANDARD 1.5 25 14 R-4 FAN RM BLDG RELIEF GREENHECK SPD-CA-36 PROPELLER 11,930CFM NEMA STANDARD 1.5 25 14 R-5 FAN RM BLDG RELIEF GREENHECK SPD-CA-36 PROPELLER 11,930CFM NEMA STANDARD 1.5 25 14 R-6 FAN RM BLDG RELIEF GREENHECK SPD-CA-36 PROPELLER 11,930CFM NEMA STANDARD 1.5 25 14 EF-1 FAN RM TOILET EXHAUST COOK 150 UTILITY FAN 2635CFM NEMA STANDARD 1.5 25 14 EF-2 ROOF KITCHEN HOOD EXHAUST GREENHECK CUBE 100 CENTRIFUGAL 800CFM NEMA STANDARD 0.25 15 4 EF-3 FAN RM JANITOR EXHAUST COOK 150 UTILITY FAN 2635CFM NEMA STANDARD 1.5 25 14
Muldoon Elementary School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) EF-4 JANITOR RM A122 JANITOR EXHAUST PENN ZEPHYR CEILING EXHAUST 350CFM NEMA STANDARD 105W 25 14 EF-5 JANITOR RM B112 JANITOR EXHAUST PENN ZEPHYR CEILING EXHAUST 48CFM NEMA STANDARD 48W 25 14 EF-6 TRASH COMPACT CHUTE EXHAUST GREENHECK G70 CENTRIFUGAL 300CFM NEMA STANDARD 1/30 15 4 CF-1 BOILER RM COOLING PENN BC24Q PROPELLER 3900CFM NEMA STANDARD 0.75 25 14 AHU-1 FAN RM CLASSROOMS AND OFFICES SCOTT SPRINGFIELD EQ-500-AHU-56500-H PROPELLER 56,500CFM ≈80% (2) 30hp VFD 15 4 AHU-2 FAN RM MPR, MUSIC RM, STAGE SCOTT SPRINGFIELD HQ-125-AHU-11700-H PROPELLER 11,670CFM ≈80% 7.5 15 4 AHU-3 FAN RM GYMNASIUM SCOTT SPRINGFIELD EQ-80-AHU-7900-H PROPELLER 7900CFM ≈80% 5 15 4 AHU-4 FAN RM SERVER RM SCOTT SPRINGFIELD EQ-15-AHU-600 PROPELLER 600CFM ≈80% 1/3 15 4
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Appendix D
Energy Conservation Measures
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Setback Thermostat:
Classrooms/Offices
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Classrooms/Offices
space.
$9,186 $448 260.86 0
2 Setback Thermostat:
Gymnasium /
Multipurpose
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Gymnasium /
Multipurpose space.
$1,910 $107 227.05 0.1
3 Setback Thermostat:
Intermittent/Storage/
Utility
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the
Intermittent/Storage/Utility
space.
$750 $237 40.25 0.3
4 Lighting: Office
Lighting
Add new Occupancy
Sensor
$224 $837 4.12 3.7
5 Lighting: Mechanical
Room Lighting
Improve Manual Switching $115 $500 3.54 4.4
6 Lighting: Office
Lighting
Add new Occupancy
Sensor
$21 $105 3.13 4.9
7 Lighting: Office
Lighting
Replace with FLUOR
CFL, Spiral 26 W
$13 $30 2.68 2.4
8 HVAC And DHW Add a Stack Economizer to
the Boiler Exhaust Flue
$2,788 $21,000 2.13 7.5
9 Lighting: Office
Lighting
Add new Occupancy
Sensor
$75 $558 2.06 7.5
10 Lighting: Exterior
Lighting
Replace with 24 LED 50W
Module StdElectronic
$840 $7,000 1.85 8.3
11 Lighting: Library
Lighting
Replace with 2 FLUOR
CFL, Spiral 23 W
$7 $60 1.69 9.1
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
12 Lighting: Exterior
Lighting
Replace with 29 LED 35W
Module StdElectronic
$840 $10,000 1.29 11.9
13 Air Tightening Perform air sealing to
reduce air leakage by 20%.
$2,479 $22,000 1.02 8.9
14 Garage Door:
Outside Storage -
Overhead Door
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$30 $655 1.01 21.9
15 Lighting: Utility and
Storage Lighting
Replace with FLUOR
CFL, Spiral 23 W
$4 $30 0.93 6.8
16 Lighting: Exterior
Lighting
Replace with 8 LED 150W
Module StdElectronic
$901 $20,000 0.69 22.2
17 Exterior Door:
Exterior - Double
Doors w/windows
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$102 $3,279 0.69 32.2
18 Lighting: Exterior
Lighting
Replace with 6 LED (2)
150W Module (2)
StdElectronic
$963 $24,000 0.62 24.9
19 Exterior Door:
Exterior - Single
Door
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$172 $6,559 0.58 38.1
20 Window/Skylight:
North Face -
Windows
Install Lexan magnetic
storm window on interior
$159 $4,515 0.57 28.4
21 Window/Skylight:
West Face -
Windows
Install Lexan magnetic
storm window on interior
$137 $3,885 0.57 28.4
22 Window/Skylight:
East Face - Windows
Install Lexan magnetic
storm window on interior
$74 $2,100 0.57 28.4
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
23 Window/Skylight:
South Face -
Windows
Install Lexan magnetic
storm window on interior
$187 $6,125 0.49 32.8
24 Above-Grade Wall:
School - Walls
Add R-5 rigid foam to
interior or exterior of
existing wall; cost does not
include siding or wall
coverings.
$798 $62,131 0.28 77.8
25 Above-Grade Wall:
North Wall - MPR
Add R-5 rigid foam to
interior or exterior of
existing wall; cost does not
include siding or wall
coverings.
$81 $9,413 0.19 116.1
26 Lighting: Utility and
Storage Lighting
Add new Occupancy
Sensor
$7 $900 0.12 126.3
27 Exterior Door:
Exterior - Double
Doors w/o windows
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$12 $3,279 0.08 278
TOTAL $22,874 $209,753 1.5 9.2
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
PB-1 Below- (part or all)
Grade Wall:
Portable Building
Skirting
Install R-15 rigid foam
board to interior or exterior
side of wall. Does not
include cost of coverings.
$1,036 $1,624 13.20 1.6
PB-2 Setback
Thermostat:
Portable Building
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Portable Building
space.
$565 $1,000 6.93 1.8
PB-3 Cathedral Ceiling:
Portable Building -
Cold Roof
Add R-19 dense-pack to
existing insulation.
$299 $1,943 3.18 6.5
PB-4 Exterior Door:
Portable Building -
Doors
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$93 $781 2.47 8.4
PB-5 Lighting:
Relocatable
Lighting
Replace with 3 FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor
$38 $500 1.16 13.3
PB-6 Air Tightening Perform air sealing to
reduce air leakage by 30%.
$116 $950 1.07 8.2
PB-7 Above-Grade
Wall: Portable
Building - 2x4
Stud Wall
Install R-20 rigid foam
board to exterior and cover
with T1-11 siding or
equivalent.
$499 $11,597 0.89 23.3
PB-8 Window/Skylight:
Portable Building -
Single Pane
Windows
Replace existing window
with U-0.35 wood window
$64 $1,635 0.61 25.4
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
PB-9 Lighting:
Relocatable
Lighting
Replace with 26 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add new
Occupancy Sensor
$31 $4,050 0.12 129.3
PB-10 Lighting:
Relocatable
Lighting
Replace with 2 LED 35W
Module StdElectronic
$2 $600 0.04 391.6
PB-11 Lighting:
Relocatable
Lighting
Replace with 9 FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor
-$72 $1,450 -0.77 -20
TOTAL $2,670 $26,130 1.87 9.8
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
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
24 Above-Grade Wall:
School - Walls
Wall Type: Single Stud
Siding Configuration: Siding
and Sheathing
Insul. Sheathing: None
Structural Wall: 2 x 6, 16
inches on center
R-19 Batt:FG or RW, 5.5
inches
Window and door headers:
Insulated
Modeled R-Value: 16.7
Add R-5 rigid foam to
interior or exterior of
existing wall; cost does not
include siding or wall
coverings.
$62,131 $798
25 Above-Grade Wall:
North Wall - MPR
Wall Type: Single Stud
Siding Configuration: Siding
and Sheathing
Insul. Sheathing: None
Structural Wall: 2 x 8, 16
inches on center
R-25 Batt:FG or RW, 7.25
inches
Window and door headers:
Insulated
Modeled R-Value: 21
Add R-5 rigid foam to
interior or exterior of
existing wall; cost does not
include siding or wall
coverings.
$9,413 $81
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Exterior Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
14 Garage Door:
Outside Storage -
Overhead Door
Door Type: 1 3/8" sectional
door, EPS core, no thermal
break
Insulating Blanket: None
Modeled R-Value: 2.6
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$655 $30
17 Exterior Door:
Exterior - Double
Doors w/windows
Door Type: Metal/FG half lite
Modeled R-Value: 2.2
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$3,279 $102
19 Exterior Door:
Exterior - Single
Door
Door Type: Metal - urethane,
no therm. break
Modeled R-Value: 2.5
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$6,559 $172
27 Exterior Door:
Exterior - Double
Doors w/o
windows
Door Type: Metal - urethane,
therm. break
Modeled R-Value: 5.3
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$3,279 $12
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
20 Window/Skylight:
North Face -
Windows
Glass: Double, glass
Frame: Aluminum w/ Thermal
Break
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U-Value: 0.62
Solar Heat Gain Coefficient
including Window Coverings:
0.46
Install Lexan magnetic
storm window on interior
$4,515 $159
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
21 Window/Skylight:
West Face -
Windows
Glass: Double, glass
Frame: Aluminum w/ Thermal
Break
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U-Value: 0.62
Solar Heat Gain Coefficient
including Window Coverings:
0.46
Install Lexan magnetic
storm window on interior
$3,885 $137
22 Window/Skylight:
East Face -
Windows
Glass: Double, glass
Frame: Aluminum w/ Thermal
Break
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U-Value: 0.62
Solar Heat Gain Coefficient
including Window Coverings:
0.46
Install Lexan magnetic
storm window on interior
$2,100 $74
23 Window/Skylight:
South Face -
Windows
Glass: Double, glass
Frame: Aluminum w/ Thermal
Break
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U-Value: 0.62
Solar Heat Gain Coefficient
including Window Coverings:
0.46
Install Lexan magnetic
storm window on interior
$6,125 $187
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Air Leakage
Rank Location Estimated Air Leakage Recommended Air Leakage
Target
Installed
Cost
Annual
Energy
Savings
13 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%.
$22,000 $2,479
2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
8 Add a Stack Economizer to the Boiler Exhaust Flue $21,000 $2,788
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
1 Classrooms/Offices Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Classrooms/Offices
space.
$448 $9,186
2 Gymnasium /
Multipurpose
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Gymnasium /
Multipurpose space.
$107 $1,910
3 Intermittent/Storage/
Utility
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the
Intermittent/Storage/Utility
space.
$237 $750
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Ventilation
Rank Recommendation Cost Annual
Energy
Savings
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
4 Office Lighting 24 FLUOR (4) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$837 $224
5 Mechanical Room
Lighting
2 FLUOR (2) T8 4' F32T8 32W
Standard Program
StdElectronic with Manual
Switching
Improve Manual Switching $500 $115
6 Office Lighting 3 FLUOR (3) T8 4' F32T8 32W
Standard (2) Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$105 $21
7 Office Lighting INCAN A Lamp, Std 100W
with Manual Switching
Replace with FLUOR CFL,
Spiral 26 W
$30 $13
9 Office Lighting 16 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$558 $75
10 Exterior Lighting 24 MH 100 Watt Magnetic with
Manual Switching
Replace with 24 LED 50W
Module StdElectronic
$7,000 $840
11 Library Lighting 2 INCAN A Lamp, Std 60W
with Manual Switching,
Occupancy Sensor
Replace with 2 FLUOR
CFL, Spiral 23 W
$60 $7
12 Exterior Lighting 29 MH 70 Watt Magnetic with
Manual Switching
Replace with 29 LED 35W
Module StdElectronic
$10,000 $840
15 Utility and Storage
Lighting
INCAN A Lamp, Std 60W with
Manual Switching
Replace with FLUOR CFL,
Spiral 23 W
$30 $4
16 Exterior Lighting 8 HPS 400 Watt Magnetic with
Manual Switching
Replace with 8 LED 150W
Module StdElectronic
$20,000 $901
18 Exterior Lighting 6 HPS (2) 400 Watt (2)
Magnetic with Manual
Switching
Replace with 6 LED (2)
150W Module (2)
StdElectronic
$24,000 $963
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
26 Utility and Storage
Lighting
4 FLUOR (2) T8 4' F32T8 32W
Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$900 $7
Refrigeration
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
Other Electrical Equipment
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
Cooking/Clothes Drying
Rank Recommended Installed
Cost
Annual
Energy
Savings
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Appendix E
Site Survey Photos
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
1. School, Main Entrance 2. School, West Face
3. School, South Face 4. Portable Buildings, Northwest Face
5. Boilers B-1, B-2, and B-3 in boiler room 6. Domestic Hot Water Heater in boiler room
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
7. School Emergency Generator 8. Heating Water Pump, P-1 and P-2, VFDs
9. Insulated Overhead Sectional Door 10. AHU-3 in fan room
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
11. AHU-1 Variable Frequency Drives 12. Freezer in school kitchen
13. AHU-4 in fan room 14. Heat Exchanger and Glycol Tank
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
15. Manual Thermostat in entryway vestibule 16. Damaged weather stripping on exterior door
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Appendix F
Thermographic Photos
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
Coffman Engineers made miscellaneous thermographic images of Muldoon Elementary School using a
FLIR T300 Infrared Camera. This is not a thermographic study, rather photographs to illustrate easy-to-
identify heat losses.
1. Optical Image, Main Entrance. Thermal Image below is indicated by the white border.
2. Thermographic Image, Main Entrance. Temperatures indicated by color scale on right. Yellow
indicates heat leakage. The outside temperature was about -14°F.
Heat loss around doors
can indicate air leakage.
Heat loss from a
ventilated roof is
expected.
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
3. Optical Image, Northeast Service Door.
Thermal Image below is indicated by the
white border.
4. Optical Image, North Face. Thermal Image
below is indicated by the white border.
5. Thermographic image, Northeast Service
Door. Heat loss around doors can indicate
a need for better weather stripping.
6. Thermal Image, North Face. Heat loss at
windows is expected. Metal building
studs can be see as well as some heat loss
through the classroom exterior doors.
Muldoon Elementary School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. CIRI-ANC-CAEC-06
7. Optical Image, Gymnasium. Thermal
image is below.
8. Optical Image, Portable Building.
Thermal image is below.
9. Thermal Image, Gymnasium. Framing
and structural members were observed
through the brick tiles. Heat loss is also
occurring along the building and roof
seams.
10. Thermal Image, Portable Building. Heat
losses around the door can indicate a
need for weather stripping replacement.
End of Report