HomeMy WebLinkAboutCIRI-ANC-CAEC ASD Facility Maintenance Building 2012-EE
800 F Street
Anchorage, AK 99501
p (907) 276‐6664 f (907) 276‐5042
Contact: Walter K. Heins, PE, CCP, CxA, CEA
32215 Lakefront Drive
Soldotna, Alaska 99669
p (907) 260‐5311
Contact: Jerry P. Herring, PE, CEA
ENERGY AUDIT FINAL REPORT
Anchorage School District Facilities/Maintenance Building
1301 Labar Street
Anchorage, AK 99515
p (907) 348‐5132
AkWarm ID no. CIRI‐ANC‐CAEC‐03
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 i AkWarm No. CIRI-ANC-CAEC-01
Contents
I. Executive Summary .................................................................................................................. 1
II. Introduction .............................................................................................................................. 5
III. Energy Audit Process ............................................................................................................. 6
IV. Method of Analysis ................................................................................................................. 7
V. Facilities/Maintenance Building Description......................................................................... 8
V.I FACILITIES/MAINTENANCE ARCHITECTURAL DESCRIPTION ................................................................................ 8
V.II FACILITIES/MAINTENANCE MECHANICAL DESCRIPTION .................................................................................... 8
V.IIV FACILITIES/MAINTENANCE ELECTRICAL DESCRIPTION ................................................................................... 9
VI. Portable Buildings Description ........................................................................................... 10
VI.I PORTABLES ARCHITECTURAL DESCRIPTION ..................................................................................................... 10
VI.II PORTABLES MECHANICAL DESCRIPTION ......................................................................................................... 10
VI.III PORTABLES ELECTRICAL DESCRIPTION ......................................................................................................... 10
VI.IV PORTABLES MODELING DESCRIPTION ........................................................................................................... 10
VII. Historic Energy Consumption and Cost ........................................................................... 11
VII.I ELECTRICAL CONSUMPTION DATA .................................................................................................................. 11
VII.II NATURAL GAS CONSUMPTION DATA ............................................................................................................. 11
VII.III OVERALL ENERGY CONSUMPTION DATA ..................................................................................................... 11
VIII. Equipment Inventory and Photo Survey ........................................................................ 13
IX. Energy Conservation Measures .......................................................................................... 14
IX.I FACILITIES/MAINTENANCE BUILDING .............................................................................................................. 14
IX.II PORTABLE BUILDINGS ..................................................................................................................................... 19
IX.III ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION .......................................... 21
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
Appendix G - AkWarm Model of Portable Building
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Abbreviations
AHFC Alaska Housing & Finance Corporation
ARRA American Recovery & Reinvestment Act
ASD Anchorage School District
ASHRAE American Society of Heating, Refrigeration, and Air-Conditioning Engineers
BTU British Thermal Unit
CCF One Hundred Cubic Feet
CFM Cubic Feet per Minute
DDC Direct Digital Control
ECI Energy Cost Index
ECM Energy Conservation Measure
EPDM Ethylene Propylene Diene Monomer
EUI Energy Utilization Index
F Fahrenheit
HP horsepower
HPS High Pressure Sodium
HVAC Heating, Ventilating, and Air-Conditioning
IPLC Integrated Power & Load Circuit
kWh kilowatt-hour
LED Light-Emitting Diode
O&M Operations & Maintenance
sf square feet
SIR Savings-to-Investment Ratio
V Volts
W Watts
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List of Figures
1. Energy Audit Clients
2. Energy Benchmark Data
3. Anchorage, AK – Google Maps
4. ASD Facilities/Maintenance Building and Portables – Google Maps
List of Tables
1. Recommended Energy Conservation Measures Student Transportation
2. Recommended Energy Conservation Measures Portable Building
3. Portable List
4. Energy Cost and Consumption Data
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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 the Anchorage School District (ASD)
Facilities/Maintenance (F/M) complex 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
Fig. 1 – Energy Audit Clients
This audit was performed using American Recovery and Reinvestment Act (ARRA) funds to promote the
use of innovation and technology to solve energy and environmental problems in a way that improves the
State of Alaska’s economy. This can be achieved through the wiser and more efficient use of energy.
The average annual documented utility costs at this 73,856 square foot (sf) facility from January 2009 to
December 2010 are as follows:
Electricity $129,952
Natural Gas $ 29,539
Total $159.391
January 2009-December 2010 Energy Utilization Index (EUI) = 96.6 kBtu/sf
January 2009-December 2010 Energy Cost Index = 2.16 $/sf
Fig. 2 – Energy Benchmark Data
Energy Conservation Measures (ECMs) calculated to be cost effective are shown below in the Executive
Summary Table with the energy analyst’s best opinion of probable cost, savings, and investment returns.
Be aware that the measures are not all 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 IX for detailed descriptions of all cost effective ECMs.
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Table 1
Recommended Energy Conservation Measures
Facilities/Maintenance
Executive Summary – Recommended Energy Conservation Measures (ECMs)
Facilities/Maintenance Building (F/M)
Rank Feature Recommendation
Annual
Energy
Savings
Installed
Cost SIR Payback
(years)
F/M-0a Refrigerators Replace Refrigerators
older than 5 years old
- - - <10 years
F/M-1b Boiler
Shutdown
Shutdown boilers during
summer months
$260 $0 NA 0
F/M-2 Ventilation Turn off constantly
running AHUs during
unoccupied times.
$4,898 $2,000 30.08 0.4
F/M-3 Lighting: Office
Lighting and
Controls
Replace with 12 FLUOR
T8 4' F32T8 32W
Electronic Ballast and
Add 42 new Occupancy
Sensors
$1,077 $900 18.42 0.8
F/M-4 Setback
Thermostat:
Office Space
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office Space.
$2,553 $2,000 16.25 0.8
F/M-5 Lighting:
Maintenance
Shops Lighting
Replace with 7 FLUOR
T5 45.2" F54W/T5 HO
Standard StdElectronic.
Replace with 6 FLUOR
T8 4' F32T8 32W
Electronic Ballast.
$948 $1,350 10.81 1.4
F/M-6 Setback
Thermostat:
Shop Area
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Shop Area space.
$667 $2,000 4.25 3
F/M-7 Lighting:
Corridor
Replace with 2 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$36 $300 1.87 8.2
F/M-8 Lighting:
Exterior
Lighting
Replace with 25 LED
80W Module
StdElectronic. Replace
with 15 LED 400W
Module StdElectronic
$2,102 $17,500 1.85 8.3
F/M-9 HVAC And
DHW
Install exhaust stack
economizer on both
boilers.
$1,868 $20,000 1.46 10.7
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Executive Summary – Recommended Energy Conservation Measures (ECMs)
Facilities/Maintenance Building (F/M)
Rank Feature Recommendation
Annual
Energy
Savings
Installed
Cost SIR Payback
(years)
F/M-10 Exterior Door:
Main Building -
Double Door
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including
hardware.
$181 $2,928 1.36 16.2
F/M-11 Garage Door:
Main Building -
Wood Overhead
Door
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$88 $1,492 1.31 16.9
F/M-12b HVAC New EC Pumps for P-1,
2, 3, 4, 5, and 6
$803 $9,260
c 1.31 11.5
F/M-13 Air Tightening Perform air sealing to
reduce air leakage by
30%.
$1,385 $10,000 1.25 7.2
F/M-14 Lighting: Utility Improve Manual
Switching
$12 $100 1.03 8.5
Note:
a Due to advances in refrigerators in the last 5 years, new Energy Star refrigerators are significantly more efficient
than previous models. Replacing existing refrigerators, which are older than 5 years, with new energy star models
will typically have paybacks of less than 10 years.
bECM item was modeled with a separate AkWarm model and as a result the item is not an additive measure. It is
therefore not included in the final cost savings total in the final AkWarm model in the Appendix D.
c The repair cost shown ignores labor and standard replacement costs. The repair cost is the marginal cost of
making an energy-efficiency repair rather than a standard repair. See the complete ECM description in Section IX.
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Portable Building ECMs
All ECMs shown in the Portable Building Executive Summary, below, are based on an AkWarm model
for one portable building. Eight portables exist at the site. Multiply the annual energy savings and
installed costs by eight to account for all eight portables.
Table 2
Recommended Energy Conservation Measures
Portable Building
Executive Summary – Recommended Energy Conservation Measures (ECMs)
Portable Building (PB)
Rank Feature Recommendation
Annual
Energy
Savings
Installed
Cost SIR Payback
(years)
PB-1 Setback
Thermostat:
Portable Building
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Portable Building
space.
$258 $1,000 3.17 3.9
PB-2 Exterior Door:
Portable Building
- Doors
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$84 $820 2.12 9.7
PB-3 Cathedral Ceiling:
Portable Building
- Hot Roof
Add R-19 to existing
insulation.
$159 $2,520 1.30 15.9
PB-4 Air Tightening Perform air sealing to
reduce air leakage by
30%.
$93 $700 1.16 7.6
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II. Introduction
This energy audit was conducted for the Anchorage School District (ASD) Facilities/Maintenance
Building (F/M). The F/M facility complex is 73,856 sf which includes 63,100 sf for the main building and
10,756 sf for the eight portable buildings connected to the building’s electrical service The energy audit
was conducted in order to evaluate areas and equipment where utility savings relative to a baseline can be
realized with reasonable project financial ratios and payback.
Fig. 3 – Anchorage, Alaska – Google Maps
Fig. 4 – ASD Facilities/Maintenance Building and Portables – 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 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 VII).
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, 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 is gathered, the next step in the process was the physical site investigation (site visit).
The site visit was completed on July 20, 2011 with a follow-up visit in August 30, 2011, and was spent
inspecting the actual systems and answering specific questions from the preliminary review. The on-site
contact during the investigation was Mr. Bob Holbena of the Anchorage School District Facilities
Department. Occupancy schedules, O&M practices, building energy management program, and other
information that has an impact on energy consumption were obtained. After the site visit, the energy audit
includes an evaluation of the information gathered, researching possible conservation opportunities,
organizing the audit into a comprehensive report, and making ECM recommendations for mechanical,
electrical, and building envelope improvements.
a Mr. Bob Holben, (907) 242-1153 (mobile), (907) 348-5221 (office)
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IV. Method of Analysis
Having completed the preliminary audit tasks noted in Section III, Coffman Engineers, Inc. (CEI)
conducted a site survey. The site survey provides critical input in deciphering where energy opportunities
exist within the facility. The audit team walked the entire site to inventory and investigate the building
envelope and major equipment, including: HVAC, water heating, lighting, and equipment located in
shops, kitchens, offices, and classrooms. An understanding of how the major equipment is used is
determined during the audit.
The collected data was entered into the AkWarm Commercial™ software, an energy calculating program
for buildings. The data was processed by AkWarm to model a baseline from which ECMs could be
considered. The model was compared to actual utility costs to ensure the quality of baseline and proposed
energy modeling performed by AkWarm. The recommended ECMs focus on building envelope, HVAC,
lighting, water heating, and other electrical measures that will reduce annual energy consumption.
ECMs are evaluated based on building use and processes, local climate conditions, building construction
type, function, operational schedule, existing conditions, and foreseen future plans. When new equipment
is proposed, energy consumption is calculated based on the manufacturer’s cataloged information. Energy
savings are calculated by AkWarm.
Implementation of more than one ECM often affects the savings of other ECMs. The savings may in
some cases be relatively higher for an ECM implemented individually than when that ECM is just one of
multiple recommended ECMs. For example, implementing reduced operating schedules of inefficient
lighting systems may result in a given savings. Also implementing a more efficient lighting system will
add to the savings, but less than the efficient lighting would alone because there is less energy to be saved
when the lights are on a reduced operating schedule. Thus, if multiple ECM’s are recommended, the
combined savings must be 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 lifetime of the ECM. The total energy savings is calculated as the total
lifetime multiplied by the yearly savings.
The cost savings and installation costs are used to calculate simple paybackb and the Savings to
Investment Ratioc (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.
b 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).
c 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. Facilities/Maintenance Building Description
The ASD F/M Building is a large two-story office, shop and warehouse building with eight portable
buildings and three rows of electrical outlets for vehicle heaters arranged on structures called “bull rails”.
The F/M Building was originally constructed in 1976 as a large commercial brewery with process piping,
tanks and other equipment. The building was sold to the ASD and was remodeled to serve office, shop
and warehousing needs of the Facilities/Maintenance department. The office space is regularly occupied
by 30 people from 7am to 5pm every day from Monday to Friday. The shop and warehouse space is
occupied by 30 people from 7am to 5pm. There is also a night shift that uses the shop and warehouse
space as well. The eight separate portable structures are used for heated storage and are occupied for a
limited amount of time, typically only when equipment is taken in or out of the portable. One portable is
used for office space. For modeling purposes we assumed that the portables are occupied an average of 15
hours per week.
V.I Facilities/Maintenance Architectural Description
The majority of the F/M Building walls are constructed with pre-cast concrete panels. Based on the
original architectural drawings the concrete panel wall is made up of two 4” thick concrete panels that
sandwich 3” thick expanded polystyrene (EPS) insulation, for a total wall thickness of 11”. The total
effective R-value of this pre-cast concrete panel system is R-13.4. A second wall type exists for the high
walls of the glass shop area, on the south side of the Facilities/ Maintenance Building. This wall type is
constructed with metal frame walls with 4” thick structurally insulated panels, according to architectural
drawings. There is an additional layer of 2” spray foam with fireproof coating on the interior side of the
wall panel. The effective insulation value of the metal frame wall system is R-23.5. There is a total of
27,025 sf of total wall area.
Floor construction for the building is concrete slab-on-grade. The perimeter of the slab has 2” of EPS
rigid edge insulation (R-8) that extends to four feet below grade. There is 40,505 sf of slab-on-grade floor
area. There is a total of 63,100 sf of floor area within the building including second story fan rooms,
mechanical rooms, and second story office spaces.
The roof construction of the building is an EPDM roofing membrane covering rigid insulation on top of
decking. According to the original architectural drawings the rigid insulation of the roof is 3.75” thick.
The roof insulation could not be accessed; however it was estimated to be EPS rigid insulation, making
the roof system R-17.3. There is 40,505 sf of roofing on the office building.
There are several windows types in the building. Most of the windows are ½” air space, double
pane/metal frame windows. However, single-pane/metal frame windows and double-pane/vinyl frame
windows were also found.
The building has several types of exterior man doors and overhead garage doors. The man doors are older
style insulated metal doors, estimated at R-1.7. Two of the man doors appear to be hollow metal doors
with no interior insulation (estimated to be R-1). There are two types of overhead garage doors; the first is
an insulated metal panel door (R-6.3) and the second is an older solid core wood panel door (R-1.8).
V.II Facilities/Maintenance Mechanical Description
The building is heated with two dual fuel gas-oil boilers and three gas fired unit heaters. The two dual fuel
Weil-McLain boilers deliver heat to perimeter hydronic baseboards, small unit heaters and hydronic coils
in air handling units (AHUs). The two identical boilers are both model 1178 with 1,527,000 Btu/h input
rating. The boilers typically run on natural gas, but also have onsite heating oil storage with day tanks in
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order to utilize heating oil during an emergency. The boilers are estimated to be 20 years old and appear
to be well maintained. A major mechanical upgrade using the existing boilers was completed in 2001. The
boiler system is controlled by a Siemens APOGEE Direct Digital Control (DDC) system.
There are five AHUs in the building that provide heated air to the office, shop and warehouse spaces.
Four of the AHUs utilize hydronic heating coils heated from the boiler loop. These AHUs utilize older
pneumatic controls that are tied into the DDC system. The remaining AHU is gas fired and provides heat
to the wood shop area.
The domestic hot water for the building is supplied by an 85 gallon standard gas fired updraft hot water
heater. The hot water heater is manufactured by State and has an input rating of 500,000 Btu/hr. The
domestic hot water consumption of the building was estimated to be 40 gallons per day, based on typical
office usage patterns developed by ASHRAE.
V.IIV Facilities/Maintenance Electrical Description
The Facilities and Maintenance building is served by a 1200 Amp (A), 480 Volt (V), 3-phase, 4-wire,
underground electrical service by the Chugach Electric Association. The building has a standby generator
to serve critical loads in the event of a utility power outage. Inside the school, 277/480V power is used to
serve large mechanical loads, lighting, and several step-down dry-type transformers. The transformers
convert the voltage to 120/208V, three phase for receptacle loads, and computers. Since the passage of the
Energy Policy Act of 2005, all general purpose transformers have been required to meet the efficiency
requirements listed in the National Electrical Manufacturer's Association publication NEMA TP1-2002.
There may be 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.
Most office fluorescent light fixtures have been upgraded with T8 lamps and programmable start
electronic ballasts, which are compatible with occupancy sensors. Only a few T12 light fixtures remain.
In the workshop areas lighting is provided by a mixture of fluorescent T5HO, T8, and T12 light fixtures
as well as metal halide high bay light fixtures. Nightlights (un-switched light fixtures) are present
throughout the building in enough excess that the occupants of many of the corridors and offices do not
switch on the other light fixtures.
The ASD support facility campus parking lots are illuminated by several 750W pole mounted high
pressure sodium light (HPS) fixtures powered from the F&M building. The exterior of the building is also
illuminated by several 150W HPS wall pack light fixtures. All of these exterior light fixtures are
controlled by an on/off photo switch to turn the fixtures off during the day.
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VI. Portable Buildings Description
VI.I Portables Architectural Description
The eight onsite portables have 2x4 wood stud wall construction at 16” on-center with R-11 fiberglass
batt insulation in between the studs. The exterior face of the wall is T1-11 siding with drywall on the
interior side of the wall. Interior and exterior wall height is nine feet under the roof eaves, and the end-
walls vary in height from nine feet at the eaves to 11 feet at the roof peak in the center of the end wall.
One portable typically has 1,170 sq ft of exterior wall area.
The portables have above grade floors resting on sleepers. Plywood skirting protects the sleepers and
floor construction from weather. The floor construction is plywood flooring resting on 2x8 wood joists. It
is estimated that the floor has R-19 fiberglass batt insulation. One portable typically has 1,000 sq ft of
floor area. The portables are all covered by hot roofs, with shingles covering plywood decking. It is
estimated that the roof insulation is R-19 fiberglass batt insulation. One portable typically has 1,000 sq ft
of roof area. The windows of the portables include both single pane and double pane wood windows.
There are typically two metal doors per portable, with estimated insulation values of R-1.7.
Table 3
Portable List
Name Usage Name Usage
Portable 1 Office Portable 5 Storage
Portable 2 Office Portable 6 Storage
Portable 3 Shop Portable 7 Storage
Portable 4 Storage Portable 8 Storage
Note: Portable numbers were created for this audit and may not represent the actual number used by ASD.
VI.II Portables Mechanical Description
All eight portables are heated with electric resistance perimeter baseboards and electric unit heaters. The
electric baseboard temperature set point is controlled by a dial thermostat on each individual baseboard.
This makes it easy for the electric baseboards to be left on at higher temperatures than is required. 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.
VI.III Portables Electrical Description
The lighting in the eight portables is typically 2 lamp, 4ft long, T-12 light fixtures with magnetic ballasts.
Due to the low operational use of the portables and low run time of the lights (15 hrs/week) retrofitting
the T-12 light fixtures with T-8 lamps is not cost effective, at this time. In the future, this lighting retrofit
will be cost effective if the portable lighting is utilized more hours during the week.
VI.IV Portables Modeling Description
Due to the fact that the eight on-site portables have similar building envelope construction and heating
equipment, only one AkWarm model was created to model one portable building. The standardized model
was created using 1,000 sf per unit. The results and recommended ECMs generated by this single
portable AkWarm model should be extrapolated and applied to all of the eight portable buildings. On this
facility, the total portable unit floor area measured 10,756 sf. The energy and space usage was taken into
consideration when modeling the portable units and has been included within this report.
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VII. 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 provides the natural gas to the facility. Both utilities bill under their
commercial rate schedules.
VII.I Electrical Consumption Data
The electric utility costs consist of several components: a fixed monthly customer charge, an energy usage
charge, fuel surcharge, taxes, and a demand charge. The energy usage and fuel surcharge are based on the
customer's usage as measured in kilowatt-hours (kWh). The usage (kWh) is determined by load wattage
divided by 1,000, times hours running. For example; a 1,000 watt space heater operating for one hour will
use 1 kWh of electricity as would ten, 100 watt lamps operating for one hour or one, 100W lamp
operating for 10 hours. One kWh is equivalent to 3,413 BTU.
VII.II Natural Gas Consumption Data
The natural gas supplier bills for consumption 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 (also called one “Therm”).
VII.III Overall Energy Consumption Data
The average billing rates for energy use are calculated by dividing the total cost by the total usage. Based
on the electric and natural gas utility data provided, the 2009 and 2010 costs for the energy and
consumption at the surveyed facility are summarized in the table below.
Table 4
Energy Cost and Consumption Data
Energy Cost and Consumption Data
2009 2010 Average
Electric Rate $0.12 /kWh $0.10 /kWh $0.11 /kWh
Natural Gas Rate $1.02 /CCF $0.91 /CCF $0.95 /CCF
Total Cost $180,517 $139,385 $159,391
ECI $2.44 /sf $1.89 /sf $2.16 /sf
Electric EUI 56.7 kBtu/sf 52.2 kBtu/sf 54.4 kBtu/sf
Natural Gas EUI 42.0 kBtu/sf 42.2 kBtu/sf 42.1 kBtu/sf
Building EUI 98.8 kBtu/sf 94.4 kBtu/sf 96.6 kBtu/sf
The Energy Cost Index (ECI) is derived by dividing the annual cost by the building square footage. The
building square footage of the main building and portables was calculated to be 73,856 sf. This area
includes 63,100 sf for the main building and 10,756 sf for the eight portable buildings.
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
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calculate and verify the gross area of the facility. The gross area was confirmed on the physical site
investigation.
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VIII. 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.
Photos of various equipment and the building construction were taken during the site visit. Several photos
detailing the equipment and building are included in Appendix E.
CEI made miscellaneous thermographic images of the building using a FLIR T300 Infrared Camera. This
is not a thermographic study, but rather just a few snapshots to illustrate easy-to-identify heat losses.
These thermographic photos are included in Appendix F.
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IX. Energy Conservation Measures
The following ECMs described here have been calculated by AkWarm Commercial and considered by the
energy audit team as viable projects. ECMs provided below are considered to have viable financial ratios
(SIR>1) or to add value to the building or building operational profiles. For a full list of ECMs considered
and calculated by the energy audit team, including ECMs not recommended at this time, please see
Appendix D.
IX.I Facilities/Maintenance Building
ECM #FM-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 5 years, new Energy Star refrigerators are significantly
more efficient than previous models. Replacing existing refrigerators, which are older than 5 years old,
with new energy star models will typically have paybacks of less than 10 years.
ECM #FM-1 – Shutdown Boilers During Summer Months
Annual Energy Savings Installed Cost SIR Payback (years)
$260 $0 -0
The two dual fuel, gas-oil, 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 the F/M building does not contain grooved-joint couplings, leaks should not be an
issue when boilers are shut down seasonally. Since there is no installed cost, the payback is immediate,
and the SIR is large enough that it can be described as “infinite.” 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 the Appendix D.
ECM #FM-2 – Reduce AHU Operation
Annual Energy Savings Installed Cost SIR Payback (years)
$4,898 $2,000 30.08 0.4
There are four existing air handling units (AHUs) that operate continuously in the Facilities/ Maintenance
Building: AHUs-2, 3, 4 and 5. (See Appendix C Major Equipment List) Significant energy savings exist
by stopping the fan motors of these AHUs during unoccupied times with a timer control. By shutting
down the AHUs during unoccupied times, the amount of cold outside air that needs to be heated by the
heating system is reduced. This in turn reduces the amount of natural gas being used by the boiler. The
electrical consumption of the fan motors would also be reduced. A manual override should also be
installed to allow the AHUs to be turned on in the event that people occupy the building during typically
unoccupied times. See measure 1 in appendix D for more details of this measure.
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ECM #FM-3 – Upgrade the Lighting and Control systems in the Offices
Annual Energy Savings Installed Cost SIR Payback (years)
$2,840 $8,850 4.93 3.12
Upgrading the lighting and control systems in the office spaces in the Facilities/Maintenance building
would include retrofitting a few U-Tube T12 light fixtures with magnetic ballasts with T8 lamps and
program start electronic ballasts. Additionally, every office space would be provided an occupancy sensor
for control. This would be a simple retrofit since most of the office spaces are illuminated via T8
fluorescent light fixtures with program start electronic ballasts that are compatible with occupancy
sensors. There are approximately 12 U-tube light fixtures that require upgrading and approximately 42
occupancy sensors that would be installed in the office spaces.
This description is for a compilation of several ECM's that are intended to be implemented at the same
time, however due to constraints with the AkWarm modeling software the different lighting
configurations were modeled separately. See measures 2, 5, 6, 7, 9, 11 and 20 in appendix D for details of
individual measures.
ECM #FM-4 – Setback Thermostat for Office Space
Annual Energy Savings Installed Cost SIR Payback (years)
$2,553 $2,000 16.25 0.8
Significant energy savings exist by reducing the room temperature of the office space during unoccupied
times. In order to utilize a setback thermostat, the hydronic baseboards in the mezzanine area will need
automatic thermostat control, as they can only be manually controlled at this time. During the site visit, it
was noted that the mezzanine baseboards were delivering heat even though it was a hot day and the room
was overheating. The roof top air conditioning units were simultaneously cooling the space, to
compensate for the manually set baseboards. If these baseboards can be thermostatically controlled, then
further savings can be achieved because the air conditioner units will not be required to run as much.
Adding thermostat controls to the mezzanine baseboards and reducing the temperature of all office spaces
to 60F during unoccupied times will save approximately $2,553 annually, with an estimated installed cost
of $2,000. See measure 3 in appendix D for more details of this measure.
ECM #FM-5 – Upgrade the Lighting in the Maintenance Shops
Annual Energy Savings Installed Cost SIR Payback (years)
$1,135 $2,475 7.04 2.2
Upgrading the lighting maintenance shops in the Facilities/Maintenance building would include replacing
several 400W metal halide light fixtures with fluorescent T5HO light fixtures in the paint shop and the
vehicle maintenance shops, and replace the several T12 fluorescent light fixtures with magnetic ballasts
with T8 lamps and program start electronic ballasts in room 40A. There are approximately seven metal
halide, and six fluorescent light fixtures that require upgrading.
This description is for a compilation of several ECM's that are intended to be implemented at the same
time, however due to constraints with the AkWarm modeling software the different lighting
configurations were modeled separately. See measures 5, 10 and 12 in appendix D for details of
individual measures.
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ECM #FM-6 – Setback Thermostat for Office Space
Annual Energy Savings Installed Cost SIR Payback (years)
$667 $2,000 4.25 3
Significant energy savings exist by reducing the room temperature of the shop spaces during unoccupied
times. Reducing the temperature of all office spaces to 60F during unoccupied times will save
approximately $667 annually, with an estimated installed cost of $2,000. See measure 8 in appendix D for
more details of this measure.
ECM #FM-7 – Replace the Existing Two Lamp T12 Light Fixtures with T8 Light Fixtures in
Stairways SW2 and SW10
Annual Energy Savings Installed Cost SIR Payback (years)
$36 $300 1.87 8.2
The corridors and stairways in the ASD F&M building were originally illuminated by T12 light fixtures
with magnetic ballasts. Most of these light fixtures have been upgraded with T8 lamps and programmable
start ballasts. However, two of the existing fixtures have not yet been upgraded, specifically in stairways
SW2 and SW10 and they should be upgraded with drop in retrofit kits. See measure 13 in appendix D for
more details of this measure.
ECM #FM-8 – Upgrade the Exterior Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$5,280 $55,000 1.48 10.42
The exterior of the ASD F&M building is illuminated by approximately (25) 150W HPS wall pack light
fixtures and (15) 750W HPS pole mounted light fixtures. These light fixtures are controlled by a photocell
to turn the fixtures off during the day. Replacing these existing HPS light fixtures with LED fixtures
would provide a significant energy savings and may also increase the safety of the parking area because
of better color rendering qualities offered by LED sources. Another potential economic benefit that is not
modeled here is the reduction in maintenance costs resulting from increased lamp life.
This description is for a compilation of several ECM's that are intended to be implemented at the same
time, however due to constraints with the AkWarm modeling software the different lighting
configurations were modeled separately. See measures 14 and 18 in appendix D for details of individual
measures.
ECM #FM-9 – Install Exhaust Stack Economizer
Annual Energy Savings Installed Cost SIR Payback (years)
$1,868 $20,000 1.46 10.7
Installing one exhaust stack economizer on the combined exhaust stack of the two existing dual fuel, gas-
oil, boilers will recover heat from exhaust gases. An exhaust stack economizer utilizes a fan and heat
exchanger to transfer heat from exhaust gases to the hydronic system, increasing the efficiency of the
heating system by approximately 5% or more. Exhaust stack economizers can only be used when burning
natural gas or propane at this time. For use with the dual fuel gas-oil boilers, the economizers must be
installed with a by-pass stack and diverting damper to ensure that exhaust from burning heating oil do not
travel through the exhaust stack economizer heat exchanger. This ECM will cost approximately $20,000
with an annual savings of $1,868. See measure 15 in appendix D for more details of this measure.
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ECM #FM-10 – Replace Two Double Doors
Annual Energy Savings Installed Cost SIR Payback (years)
$181 $2,928 1.36 16.2
There are two 90” x 120” hollow metal exterior doors that do not have any insulation inside of them (R-
1). It is recommended that both doors be removed and replaced with new R-6.25 minimum (U-0.16)
insulated doors. This ECM will save approximately $181 per year with installed cost of $2,928. See
measure 16 in appendix D for more details of this measure.
ECM #FM-11 – Replace Wood Overhead Garage Doors
Annual Energy Savings Installed Cost SIR Payback (years)
$88 $1,492 1.31 16.9
There are two 8’-6” x 7’-6” hollow wood overhead garage doors in the vehicle maintenance shop that are
un-insulated (R-1.8). It is recommended that both doors be removed and replaced with new R-7
minimum, 2” polyurethane core garage doors. This ECM will save approximately $88 per year with
installed cost of $1,492. See measure 17 in appendix D for more details of this measure.
ECM #FM-12 - New EC Pumps for P-1, 2, 3, 4, 5, and 6
Annual Energy Savings Installed Cost SIR Payback (years)
$803 $9,260 1.31 11.5
The eight existing circulation pumps (P-1, 2, 3, 4, 5, and 6) 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 $17,380 replacement cost with an annual energy savings of $634, and a simple payback of 27
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 the high efficiency EC motor over
the standard replacement is only a $9,260 repair cost. This repair cost offers a simple payback of 11.5
yrs, resulting in an SIR of 1.31. 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 the Appendix D.
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ECM #FM-13 – Air Tightening
Annual Energy Savings Installed Cost SIR Payback (years)
$1,385 $10,000 1.25 7.2
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
natural gas 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. Leakage is also expected to be occurring through old decommissioned AHUs near the MCR
area and through ceiling outdoor air intake dampers in the shop areas. 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, seal the outdoor air ducts of the old decommissioned AHUs and replace dampers as
needed. See measure 19 in appendix D for more details of this measure.
ECM #FM-14 - Remove High Bay Light Fixture in Utility Room 116
Annual Energy Savings Installed Cost SIR Payback (years)
$12 $100 1.03 8.5
In utility room 116 there is an existing 400W Metal Halide high bay fixture that is not needed, due to the
fact that adequate light levels are provided by other existing lights in the room. Removing this 400W light
fixture will reduce electricity consumption. See measure 21 in appendix D for more details of this
measure.
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IX.II Portable Buildings
There are eight portable buildings that exist on-site and are connected to the electrical service of the main
Facilities/ Maintenance Building. A typical AkWarm model was created to model the typical portable,
due to similarities in construction type and heating systems. The following ECM savings and installed
costs are for one portable building. Multiply the results by eight to obtain savings and costs for all eight
portables combined.
ECM #PB-1 – Setback Thermostat
Annual Energy Savings Installed Cost SIR Payback (years)
$258 $1,000 3.17 3.9
Significant energy savings exist by reducing the room temperature of the portable buildings during
unoccupied times. However, due to the fact that each portable building has many 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 temperatures in the portables are typically much higher than required,
65F or warmer. Also, temperatures cannot be set back during unoccupied times. It is recommended that a
central programmable thermostat be installed in the portable building that can turn on or off the perimeter
electric baseboards to control occupied and unoccupied temperature set points. Reducing the portable
temperature from 65F to 60F during unoccupied times, for portables used as office space, will save $258
annually in electricity bills. Further savings can be had for portables used for warm storage, where indoor
temperatures of 40F are sufficient warm storage temperatures. Reducing the portable temperature from
65F to 40F for warm storage portables will save approximately $1,400 annually in electricity bills.
ECM #PB-2 – Replace Exterior Doors
Annual Energy Savings Installed Cost SIR Payback (years)
$84 $820 2.12 9.7
The portable buildings each have 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.
ECM #PB-3 – Add Roof Insulation
Annual Energy Savings Installed Cost SIR Payback (years)
$159 $2,520 1.30 15.9
Adding additional R-19 fiberglass batt insulation to the roof of the portables 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 $159 per year per portable, with an installed cost of $2,520 if completed in
combination with the roof replacement. This ECM will give a SIR of 130 and a simple payback of 15.9
years.
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ECM #PB-4– Seal Building Envelope and Reduce Infiltration by 20%
Annual Energy Savings Installed Cost SIR Payback (years)
$93 $700 1.16 7.6
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 electric heaters. Reducing infiltration by air sealing the building envelope
will produce energy savings. 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 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. Reducing infiltration by 20% with air sealing
improvements will save approximately $62 per year per portable and will have an installation cost of
approximately $700.
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IX.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
Anchorage School District Facilities/Maintenance Draft Energy Audit Report
First Name Last Name Middle Name Phone
Chris Lynch 348-5250
State Zip
AK 99515-3517
Monday-Friday Saturday Sunday Holidays
08:00-5:00
Average # of
Occupants
During
Renovations
Date
Facility Zip
261,500
99517
Email
lynch_chris@asdk12.org
1301 Labar St Anchorage
Primary
Operating
Hours
Contact Person
City
Anchorage1301 Labar Street
Details
Mailing Address
Main Building = 63100 SF
REAL Preliminary Benchmark Data Form
PART I – FACILITY INFORMATION
Facility Owner
MOA
Facility Owned By Date
03/14/11Municipal Government/Subdivision
ASD Facility Maintenance Other 73,856
Year Built
Building Name/ Identifier Building Usage Building Square Footage
Facility Address
Building Type
Mixed
Community Population
Facility City
1976
PART II – ENERGY SOURCES
Heating Oil Electricity Natural Gas Propane Wood Coal
$ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton
Other energy
sources?
Describe
Outbuildings = 10756 SF
Main Building = 63100 SF
Total = 73856 SF
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.
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Anchorage School District Facilities/Maintenance Draft Energy Audit Report
ASD Facility Maintenance
Buiding Size Input (sf) =73,856
2009 Natural Gas Consumption (Therms)31,056.00
2009 Natural Gas Cost ($)31,213
2009 Electric Consumption (kWh)1,227,418
2009 Electric Cost ($)149,304
2009 Total Energy Use (kBtu)7,294,778
2009 Total Energy Cost ($)180,517
Annual Energy Use Intensity (EUI)
2009 Natural Gas (kBtu/sf) 42.0
2009 Electricity (kBtu/sf)56.7
2009 Energy Utilization Index (kBtu/sf)98.8
Annual Energy Cost Index (ECI)
2009 Natural Gas Cost Index ($/sf)0.42
2009 Electric Cost Index ($/sf)2.02
2009 Energy Cost Index ($/sf)2.44
2010 Natural Gas Consumption (Therms)31,182.00
2010 Natural Gas Cost ($)27,858
2010 Electric Consumption (kWh)1,128,821
2010 Electric Cost ($)111,527
2010 Total Energy Use (kBtu)6,970,866
2010 Total Energy Cost ($)139,385
Annual Energy Use Intensity (EUI)
2010 Natural Gas (kBtu/sf)42.2
2010 Electricity (kBtu/sf)52.2
2010 Energy Utilization Index (kBtu/sf)94.4
Annual Energy Cost Index (ECI)
2010 Natural Gas Cost Index ($/sf)0.38
2010 Electric Cost Index ($/sf)1.51
20010 Energy Cost Index ($/sf)1.89
Note:
1 kWh = 3,413 Btu's
1 Therm = 100,000 Btu's
1 CF ≈ 1,000 Btu's
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Anchorage School District Facilities/MaintenanceDraft Energy Audit ReportASD Facility MaintenanceNatural GasBtus/CCF =100,000Provider Customer # Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)Enstar NGC560Jan-09 12/30/08 02/02/09344,7454,745$4,814$1.01Enstar NGC560 Feb-09 02/02/09 02/27/09253,4373,437$3,514$1.02Enstar NGC560 Mar-09 02/27/09 04/01/09333,2803,280$3,347$1.02Enstar NGC560 Apr-09 04/01/09 04/29/09282,2782,278$2,351$1.03Enstar NGC560 May-09 04/29/09 06/01/09331,7201,720$1,784$1.04Enstar NGC560Jun-09 06/01/09 06/30/09291,4541,454$1,525$1.05Enstar NGC560Jul-09 06/30/09 07/31/0931470470$535$1.14Enstar NGC560 Aug-09 07/31/09 08/31/09311,4751,475$1,544$1.05Enstar NGC560 Sep-09 08/31/09 09/30/09301,9101,910$1,980$1.04Enstar NGC560 Oct-09 09/30/09 10/29/09292,5262,526$2,602$1.03Enstar NGC560 Nov-09 10/29/09 11/30/09323,8273,827$3,898$1.02Enstar NGC560 Dec-09 11/30/09 12/31/09313,9343,934$3,319$0.84Enstar NGC560Jan-10 12/31/09 02/01/10324,3134,313$3,630$0.84Enstar NGC560 Feb-10 02/01/10 03/01/10283,0203,020$2,562$0.85Enstar NGC560 Mar-10 03/01/10 04/01/10313,3273,327$2,845$0.86Enstar NGC560 Apr-10 04/01/10 04/30/10292,0602,060$1,790$0.87Enstar NGC560 May-10 04/30/10 05/27/10271,7061,706$1,500$0.88Enstar NGC560Jun-1005/27/1006/29/10331,5551,555$1,360$0.87Enstar NGC560Jun-1005/27/1006/29/10331,5551,555$1,360$0.87Enstar NGC560Jul-10 06/29/10 07/29/10301,5701,570$1,395$0.89Enstar NGC560 Aug-10 07/29/10 08/30/10321,5631,563$1,600$1.02Enstar NGC560 Sep-10 08/30/10 10/01/10321,6641,664$1,670$1.00Enstar NGC560 Oct-10 10/01/10 10/28/10272,1872,187$2,156$0.99Enstar NGC560 Nov-10 10/28/10 11/29/10323,0833,083$2,808$0.91Enstar NGC560 Dec-10 11/29/10 12/29/10305,1345,134$4,542$0.88Jan - 09 to Dec - 09 total:31,05631,0560$31,213$0Jan - 10 to Dec - 10 total:31,18231,1820$27,858$0$1.01$0.89Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Coffman Engineers, Inc.AkWarm No. CIRI-ANC-CAEC-03Anchorage School District Facilities/Maintenance Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-03 Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Anchorage School District Facilities/MaintenanceDraft Energy Audit Report$2,000 $3,000 $4,000 $5,000 $6,000 2,0003,0004,0005,0006,000Natural Gas Cost ($)Natural Gas Consumption (Therms)ASD Facility Maintenance - Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)Natural Gas Consumption (Therms)Natural Gas Cost ($)Coffman Engineers, Inc.AkWarm No. CIRI-ANC-CAEC-03$0 $1,000 $2,000 01,0002,000Natural Gas Consumption (Therms)Date (Mon - Yr)Anchorage School District Facilities/Maintenance Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-03 Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Anchorage School District Facilities/MaintenanceDraft Energy Audit ReportASD Facility MaintenanceElectricityBtus/kWh =3,413Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)CEA 2732-40302600 Jan-09 12/30/2008 1/30/200931140,0364,779262 $19,632$0.14$2,903.80CEA 2732-40302600 Feb-09 1/30/2009 3/3/200932123,1304,202250 $17,006$0.14$2,770.60CEA 2732-40302600 Mar-09 3/3/2009 4/1/200929125,8884,297250 $16,684$0.13$2,584.10CEA 2732-40302600 Apr-09 4/1/2009 4/30/200929107,9453,684233 $14,250$0.13$2,308.80CEA 2732-40302600 May-09 4/30/2009 6/1/20093281,6852,788170 $10,812$0.13$1,991.40CEA 2732-40302600 Jun-09 6/1/2009 7/1/20093070,2242,397170 $8,194$0.12$1,687.20CEA 2732-40302600 Jul-09 7/1/2009 7/31/20093069,5312,373152 $8,068$0.12$1,616.20CEA 2732-40302600 Aug-09 7/31/2009 8/31/20093173,2802,501177 $8,412$0.11$1,678.30CEA 2732-40302600 Sep-09 8/31/2009 9/30/20093079,0402,698204 $8,877$0.11$2,049.10CEA 2732-40302600 Oct-09 9/30/2009 10/30/20093099,2503,387241 $11,010$0.11$2,364.40CEA 2732-40302600 Nov-09 10/30/2009 12/1/200932123,9004,229241 $13,272$0.11$2,790.90CEA 2732-40302600 Dec-09 12/1/2009 12/30/200929133,5094,557246 $13,087$0.10$2,855.80 CEA 2732-40302600 Jan-10 12/30/2009 1/29/201030131,4964,488234 $12,634$0.10$2,707.400CEA 2732-40302600 Feb-10 1/29/2010 3/2/201032111,9303,820229 $10,705$0.10$2,651.80CEA 2732-40302600 Mar-10 3/2/2010 4/1/201030122,2164,171229 $12,260$0.10$2,178.90CEA 2732-40302600 Apr-10 4/1/2010 5/3/20103299,9293,411213 $10,033$0.10$2,466.40CEA 2732-40302600 May-10 5/3/2010 6/2/20103079,7432,722188 $8,295$0.10$1,826.50CEA2732-40302600Jun-106/2/20107/1/20102963,9992,184158$6,461$0.10$1,557.70CEA2732-40302600Jun-106/2/20107/1/20102963,9992,184158$6,461$0.10$1,557.70CEA 2732-40302600 Jul-10 7/1/2010 8/2/20103264,7332,209148 $6,523$0.10$1,715.30CEA 2732-40302600 Aug-10 3167,5882,307148 $6,632$0.10CEA 2732-40302600 Sep-10 3066,6832,276159 $6,879$0.10CEA 2732-40302600 Oct-10 3188,3243,014178 $8,601$0.10CEA 2732-40302600 Nov-10 30105,5693,603214 $10,319$0.10CEA 2732-40302600 Dec-10 31126,6114,321240 $12,185$0.10Jan - 09 to Dec - 09 total:1,227,41841,8922,596$149,304$27,601Jan - 10 to Dec - 10 total:1,128,82138,5272,337$111,527$15,104$0.12$0.10Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Coffman Engineers, Inc.AkWarm No. CIRI-ANC-CAEC-03Anchorage School District Facilities/Maintenance Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-03 Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Anchorage School District Facilities/MaintenanceDraft Energy Audit Report$10,000$15,000$20,000$25,00060,00080,000100,000120,000140,000160,000Electric Cost ($)Electric Consumption (kWh)ASD Facility Maintenance - Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)Coffman Engineers, Inc.AkWarm No. CIRI-ANC-CAEC-03$0$5,000020,00040,000Date (Mon - Yr)Anchorage School District Facilities/Maintenance Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-03 Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Appendix B
AkWarm Commercial Reports
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Energy Audit – Energy Analysis and Cost
Comparison
AkWarm Commercial Audit Software
Anchorage School District Facility Maintenance
Building
Page 3
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 10/21/2011
3:39 PM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Anchorage School District Facility
Maintenance Building
Auditor Company: Coffman Engineers, Inc
Address: 1301 Labar St. Auditor Name: Walter Heins, PE
City: Anchorage Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Bob Holben
Client Address: 1301 Labar Street
Anchorage, AK 99515-3517
Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-5042
Client Phone: (907) 348-5221 Auditor Comment:
Client FAX:
Design Data
Building Area: 63,100 square feet Design Heating Load: Design Loss at Space:
879,747 Btu/hour
with Distribution Losses: 879,747 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency
and 25% Safety Margin: 1,341,078 Btu/hour
Note: Additional Capacity should be added for DHW
load, if served.
Typical Occupancy: 0 people Design Indoor Temperature: 67.5 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
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Utility Information
Electric Utility: Chugach Electric -
Commercial - Lg
Natural Gas Provider: Enstar Natural Gas -
Commercial - Lg
Average Annual Cost/kWh: $0.110/kWh Average Annual Cost/ccf: $0.950/ccf
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03 Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Other Electrical Cooking Clothes Drying Ventilation Fans Service Fees Total Cost Existing Building $33,791 $0 $1,398 $47,876 $66,473 $0 $0 $9,491 $0 $159,029 With Proposed Retrofits $23,734 $0 $1,398 $38,531 $66,473 $0 $0 $4,663 $0 $134,799 SAVINGS $10,057 $0 $0 $9,345 $0 $0 $0 $4,828 $0 $24,230
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03 $0$50,000$100,000$150,000$200,000Existing RetrofitVentilation and FansSpace HeatingOther ElectricalLightingDomestic Hot WaterAnnual Energy Costs by End Use
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Appendix C
Major Equipment List
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE ESTIMATED REMAINING USEFUL LIFE NOTES B‐1 Boiler Rm Building Heating Weil‐McLain 1178 Forced Draft, Gas Fired 1,527 MBH 80% 1/2 30 10 B‐2 Boiler Rm Building Heating Weil‐McLain 1178 Forced Draft, Gas Fired 1,527 MBH 80% 1/2 30 10 WH‐1 Boiler Rm Domestic Hot Water State SBD85500NEA120 Natural Draft, Gas Fired 500 MBH 70% N/A 15 14 P‐1 Boiler Rm B‐1 Circ Grundfos UPS 50‐160/F Inline 134 gpm 82% 1.5 HP 10 2 P‐2 Boiler Rm B‐2 Circ Grundfos UPS 50‐160/F Inline 134 gpm 82% 1.5 HP 10 2 P‐3 Boiler Rm B‐1 Blend Grundfos UPS 40‐80/4F Inline 67 gpm 82% 1/3 HP 10 2 P‐4 Boiler Rm B‐2 Blend Grundfos UPS 40‐80/4F Inline 67 gpm 82% 1/3 HP 10 2 P‐5 Boiler Rm B‐1 Jockey Grundfos UPS 43‐75/F Inline 33 gpm 82% 1/8 HP 10 2 P‐6 Boiler Rm B‐2 Jockey Grundfos UPS 43‐75/F Inline 33 gpm 82% 1/8 HP 10 2 P‐7A Boiler Rm Main Loop Circ Grundfos UPS 80‐160/F Inline 134 gpm 82% 3 HP 10 2 P‐7B Boiler Rm Main Loop Circ Grundfos UPS 80‐160/F Inline 134 gpm 82% 3 HP 10 2
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE ESTIMATED REMAINING USEFUL LIFE NOTES AHU‐1 First Floor Wood Shop Jackson and Church N/A Cabinet Fan with Gas Fired Burner N/A 60% Motor 1.5 HP 25 0 years (Original Unit) AHU‐2h Second Floor South Office Trane Climate‐Changer Cabinet Fan N/A 78.5% Motor 1.5 HP 25 Age Unknown AHU‐3h Second Floor MCR Area Trane Climate‐Changer Cabinet Fan N/A 78.5% Motor 1 HP 25 Age Unknown AHU‐4h Second Floor North Offices McQuay N/A Cabinet Fan N/A 60% Motor 1 HP 25 Age Unknown AHU‐5h First Floor Metal Shop Trane Climate‐Changer Cabinet Fan N/A 78.8% Motor 3 HP 25 Age Unknown FCU‐1 Rooftop AC for Mezzanine Mitsub‐ishi Mr. Slim Series Split DX System 41,000 BTU/hr cooling SEER = 10 N/A 20 15 FCU‐2 Rooftop AC for Mezzanine Mitsub‐ishi Mr. Slim Series Split DX System 41,000 BTU/hr cooling SEER = 10 N/A 20 15 AC‐1 IT Room AC for IT Room Mitsub‐ishi Mr. Slim Series Split DX System 30,000 BTU/hr cooling N/A N/A 20 17 AC‐2 IT Room AC for IT Room Mitsub‐ishi Mr. Slim Series Split DX System 30,000 BTU/hr cooling N/A N/A 20 17
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE ESTIMATED REMAINING USEFUL LIFE NOTES AC‐3d IT Room AC for IT Room Mitsub‐ishi Mr. Slim Series Split DX System 30,000 BTU/hr cooling N/A N/A 20 17 d During the site visit this existing mechanical unit was not named or numbered. In this table, this unit is numbered for organizational purposes only, and may not correspond to nomenclature used in the past.
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Appendix D
Energy Conservation Measures
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
The following tables consist of raw output data from the AkWarm Commercial program used to model
energy costs and calculate energy savings and financial ratios. These tables represent all of the energy
conservation measures calculated and considered by the energy audit team. However, ECMs included in
the Executive Summary and Section VIII are recommended by the energy audit team due to their viable
financial ratios (SIR>1) or due to their value added.
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Ventilation Turn off constantly
running AHUs during
unoccupied times.
$4,898 $2,000 30.08 0.4
2 Lighting: MCR
and Automation
Offices
Add new Occupancy
Sensor
$1,077 $900 18.42 0.8
3 Setback
Thermostat:
Office Space
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office Space.
$2,553 $2,000 16.25 0.8
4 Lighting:
Electronic, Paint,
Door, Glass and
Metal Shops
Replace with 6 FLUOR
T5 45.2" F54W/T5 HO
Standard StdElectronic
$948 $1,350 10.81 1.4
5 Lighting:
Automation
Office 114A
Add new Occupancy
Sensor and Improve
Manual Switching
$80 $150 8.17 1.9
6 Lighting: Office Add new Occupancy
Sensor
$108 $300 5.56 2.8
7 Lighting: Office Add new Occupancy
Sensor
$517 $1,500 5.30 2.9
8 Setback
Thermostat: Shop
Area
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Shop Area space.
$667 $2,000 4.25 3
9 Lighting: Office Add new Occupancy
Sensor
$810 $3,000 4.16 3.7
10 Lighting: Vehicle
Maintenance
Shop
Replace with FLUOR (4)
T5 45.2" F54W/T5 HO
Standard (2)
StdElectronic
$60 $225 4.11 3.7
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
11 Lighting: Office Add new Occupancy
Sensor
$63 $450 2.15 7.2
12 Lighting:
Electronic, Paint,
Door, Glass and
Metal Shops
Replace with 6 FLUOR
(3) T8 4' F32T8 32W
Standard Program
StdElectronic
$125 $900 2.13 7.2
13 Lighting:
Corridor
Replace with 2 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$36 $300 1.87 8.2
14 Lighting: Exterior
Lighting
Replace with 25 LED
80W Module
StdElectronic
$2,102 $17,500 1.85 8.3
15 HVAC And
DHW
Install exhaust stack
economizer on both
boilers.
$1,868 $20,000 1.46 10.7
16 Exterior Door:
Main Building -
Double Door
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including
hardware.
$181 $2,928 1.36 16.2
17 Garage Door:
Main Building -
Wood Overhead
Door
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$88 $1,492 1.31 16.9
18 Lighting: Exterior
Lighting
Replace with 15 LED
4W Module
StdElectronic
$3,176 $37,500 1.30 11.8
19 Air Tightening Perform air sealing to
reduce air leakage by
30%.
$1,385 $10,000 1.25 7.2
20 Lighting: Office Replace with 12 FLUOR
(2) T8 F32T8 32W U-
Tube Standard Program
StdElectronic and Add
new Occupancy Sensor
$182 $2,550 1.10 14
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
21 Lighting: Utility Improve Manual
Switching
$12 $100 1.03 8.5
22 Exterior Door:
Main Building -
Double Door
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including
hardware.
$51 $1,366 0.83 26.8
23 Exterior Door:
Main Building -
Std Man Doors
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including
hardware.
$168 $4,509 0.82 26.8
24 Cathedral
Ceiling: Main
Building - Hot
Roof
Install R-10 rigid board
insulation. No cost
included for covering
insulation.
$2,274 $73,314 0.69 32.2
25 Window/Skylight
: Main Building -
Windows
Install single pane storm
window on exterior
$191 $10,282 0.30 53.8
26 Window/Skylight
: Main Building -
Mezzanine
Windows
Install single pane storm
window on exterior
$379 $20,400 0.30 53.8
27 Window/Skylight
: Main Building -
Main Entry
Replace existing
windows with Low
E/argon fiberglass or
insulated vinyl windows
$67 $3,800 0.28 56.8
28 Lighting: Utility Replace with 2 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$30 $2,000 0.23 66.2
29 Window/Skylight
: Main Building -
South - Single
Pane
Replace existing
windows with Low
E/argon fiberglass or
insulated vinyl windows
$58 $5,031 0.19 86.6
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
30 Lighting: Utility Replace with 9 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$9 $900 0.15 102.5
31 Lighting:
Mechanical
Room 105
Replace with 11 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$11 $1,650 0.10 153.7
32 Window/Skylight
: Main Building -
Windows
Replace existing
windows with Low
E/argon fiberglass or
insulated vinyl windows
$21 $3,953 0.09 187
33 Window/Skylight
: Main Building -
South - Double
Pane
Replace existing
windows with Low
E/argon fiberglass or
insulated vinyl windows
$4 $900 0.08 200.7
34 Garage Door:
Main Building -
Metal Overhead
Door
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$30 $10,515 0.06 351.1
TOTAL $24,230 $245,766 1.46 10.1
Note:
ECM #F/M-1 and F/M-12 in the Executive Summary at the beginning of the report were modeled with
separate AkWarm models, due to the modeling limitations of improvement items in AkWarm. As a
result, ECM #F/M-1 and F/M-19 from the Executive Summary are not additive measures and therefore
are not included in Appendix D.
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
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 Cathedral Ceiling:
Main Building -
Hot Roof
Framing Type: I-Beam (TJI)
Framing Spacing: 24 inches
Insulated Sheathing: EPS
(Beadboard), 3.75 inches
Bottom Insulation Layer:
None
Top Insulation Layer: None
Modeled R-Value: 17.3
Install R-10 rigid board
insulation. No cost
included for covering
insulation.
$73,314 $2,274
Exterior Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
16 Exterior Door:
Main Building -
Double Door
Door Type: R-1 Door (non-
standard, not exterior)
Modeled R-Value: 1
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$2,928 $181
17 Garage Door:
Main Building -
Wood Overhead
Door
Door Type: Un-insulated
Wood Door
Insulating Blanket: None
Modeled R-Value: 1.8
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$1,492 $88
22 Exterior Door:
Main Building -
Double Door
Door Type: Metal -
fiberglass or mineral wool
Modeled R-Value: 1.7
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$1,366 $51
23 Exterior Door:
Main Building -
Std Man Doors
Door Type: Metal -
fiberglass or mineral wool
Modeled R-Value: 1.7
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$4,509 $168
34 Garage Door:
Main Building -
Metal Overhead
Door
Door Type: 1-3/4" sectional
door, polyurethane core
Insulating Blanket: None
Modeled R-Value: 6.3
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$10,515 $30
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
25 Window/Skylight:
Main Building -
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:
0.46
Install single pane storm
window on exterior
$10,282 $191
26 Window/Skylight:
Main Building -
Mezzanine
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:
0.46
Install single pane storm
window on exterior
$20,400 $379
27 Window/Skylight:
Main Building -
Main Entry
Glass: Single, Glass
Frame: Aluminum, No
Thermal Break
Spacing Between Layers:
Half Inch
Gas Fill Type: Air
Modeled U-Value: 1.30
Solar Heat Gain Coefficient:
0.52
Replace existing
windows with Low
E/argon fiberglass or
insulated vinyl windows
$3,800 $67
29 Window/Skylight:
Main Building -
South - Single
Pane
Glass: Single, Glass
Frame: Wood\Vinyl
Spacing Between Layers:
Half Inch
Gas Fill Type: Air
Modeled U-Value: 0.94
Solar Heat Gain Coefficient:
0.52
Replace existing
windows with Low
E/argon fiberglass or
insulated vinyl windows
$5,031 $58
32 Window/Skylight:
Main Building -
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:
0.46
Replace existing
windows with Low
E/argon fiberglass or
insulated vinyl windows
$3,953 $21
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
33 Window/Skylight:
Main Building -
South - Double
Pane
Glass: Double, glass
Frame: Wood\Vinyl
Spacing Between Layers:
Half Inch
Gas Fill Type: Air
Modeled U-Value: 0.51
Solar Heat Gain Coefficient:
0.46
Replace existing
windows with Low
E/argon fiberglass or
insulated vinyl windows
$900 $4
Air Leakage
Rank Location Estimated Air Leakage Recommended Air
Leakage Target
Installed
Cost
Annual
Energy
Savings
19 Air Tightness estimated as:
20100 cfm at 50 Pascals
Perform air sealing to
reduce air leakage by
30%.
$10,000 $1,385
2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
15 Install exhaust stack economizer on both boilers. $20,000 $1,868
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
3 Office Space Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office Space.
$2,000 $2,553
8 Shop Area Existing Unoccupied Heating
Setpoint: 65.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Shop Area space.
$2,000 $667
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Ventilation
Rank Recommendation Cost Annual
Energy
Savings
1 Turn off constantly running AHUs during unoccupied times. $2,000 $4,898
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
2 MCR and
Automation
Offices
25 FLUOR (4) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$900 $1,077
4 Electronic, Paint,
Door, Glass and
Metal Shops
6 MH 400 Watt Magnetic
with Manual Switching
Replace with 6 FLUOR
T5 45.2" F54W/T5 HO
Standard StdElectronic
$1,350 $948
5 Automation
Office 114A
5 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor and Improve
Manual Switching
$150 $80
6 Office 17 FLUOR (3) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$300 $108
7 Office 120 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$1,500 $517
9 Office 96 FLUOR (4) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$3,000 $810
10 Vehicle
Maintenance
Shop
MH 400 Watt Magnetic with
Manual Switching
Replace with FLUOR (4)
T5 45.2" F54W/T5 HO
Standard (2)
StdElectronic
$225 $60
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
11 Office 28 FLUOR T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$450 $63
12 Electronic, Paint,
Door, Glass and
Metal Shops
6 FLUOR (3) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 6 FLUOR
(3) T8 4' F32T8 32W
Standard Program
StdElectronic
$900 $125
13 Corridor 2 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 2 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$300 $36
14 Exterior Lighting 25 HPS 150 Watt Magnetic Replace with 25 LED
80W Module
StdElectronic
$17,500 $2,102
18 Exterior Lighting 15 HPS 750 Watt Magnetic
with Manual Switching
Replace with 15 LED 4W
Module StdElectronic
$37,500 $3,176
20 Office 12 FLUOR (2) T12 F40T12
40W U-Tube Standard
Magnetic with Manual
Switching
Replace with 12 FLUOR
(2) T8 F32T8 32W U-
Tube Standard Program
StdElectronic and Add
new Occupancy Sensor
$2,550 $182
21 Utility MH 400 Watt Magnetic with
Manual Switching
Improve Manual
Switching
$100 $12
28 Utility 2 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 2 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$2,000 $30
30 Utility 9 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 9 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$900 $9
31 Mechanical Room
105
11 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 11 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$1,650 $11
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Appendix E
Site Visit Photos
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
1. East side of building 2. Looking south across roof
3. North side of building 4. Typical double door
5. West side of building 6. 3,000 gal heating oil tank
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
7. Dual fuel, gas-oil, boilers B-1 and B-2 8. Heating oil day tank for boilers
9. Gas-fired hot water heater WH-1 10. Main circulation pumps P-7A and P-7B
11. AHU-1 serves Wood Shop 12. AHU-2i serves south offices on second floor
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
13. AHU-3i serves MCR Area 14. AHU-4i serves north offices on second floor
15. AHU-5i is located in Metal Shop 16. Siemens APOGEE Building Controller
17. Wood Shop 18. Roof top AC Units FCU-1 and FCU-2
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
19. AC units for IT Server Room AC-1, 2 and 3e 20. Onsite Portable Building
21. Onsite Portable Building 22. Onsite Portable Building
e During the site visit this existing mechanical unit was not named and numbered. In this table, this unit is numbered
for organizational purposes only, and may not correspond to nomenclature used in the past.
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Appendix F
Thermographic Photos
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
ASD Facilities/Maintenance
Coffman Engineers made miscellaneous thermographic images of the building using a FLIR T300
Infrared Camera. This is not a thermographic study, but rather just a few snapshots to illustrate easy-
to-identify heat losses. Yellow color indicates heat losses. Outside temperature was 40°F.
23. East side from Northeast. Extensive heat loss
at glazing.
24. North side from Northeast. Heat loss
indicated at roof/wall joint
25. North side doors. Heat loss can be seen
rising above overhead door.
26. South side from Southwest. Heat loss at
construction joints, second floor, and
roof/wall joint
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
ASD Facilities/Maintenance
Coffman Engineers made miscellaneous thermographic images of the building using a FLIR T300
Infrared Camera. This is not a thermographic study, but rather just a few snapshots to illustrate easy-
to-identify heat losses. Yellow color indicates heat losses. Outside temperature was 40°F.
27. South side. Solid wall in front of truck is
apparently un-insulated.
28. South side from Southeast. Heat losses
indicated at un-insulated wall, second floor,
and roof/wall joint.
29. Thermographic image of a typical portable structure. Minimal insulation is illustrated by heat loss
at studs, trusses, crawlspace, and door.
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
ASD Facilities/Maintenance
Coffman Engineers made miscellaneous thermographic images of the building using a FLIR T300
Infrared Camera. This is not a thermographic study, but rather just a few snapshots to illustrate easy-
to-identify heat losses. Yellow color indicates heat losses. Outside temperature was 40°F.
30. Older portable building exhibits heat loss at
substandard doors & windows.
31. Grounds Office portable illustrates heat loss
at windows and roof insulation defect.
32. Heat loss at door of paint storage building
indicates minimal insulation and heat loss at
weather-stripping.
33. Portable office shows typical heat losses plus
defective insulation in wall.
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Appendix G
AkWarm Model of Portable Building
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Energy Audit – Energy Analysis and Cost
Comparison
AkWarm Commercial Audit Software
Anchorage School Facility/Maintenance - Portable
Building
Page 2
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 10/21/2011 5:51
PM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Anchorage School Facility/Maintenance -
Portable Building
Auditor Company: Coffman Engineers, Inc.
Address: 1201 Labar Street Auditor Name: Walter Heins, PE
City: Anchorage Auditor Address: 800 F Street
Anchorage, AK 99501
Client Name: Bob Holben
Client Address: Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-5042
Client Phone: (907) 348-5221 Auditor Comment:
Client FAX:
Design Data
Building Area: The standardized model was created
using 1,000 sf per unit. The results and
recommended ECMs generated by this single
portable AkWarm model should be extrapolated and
applied to all of the eight portable buildings. On this
facility, the total portable unit floor area measured
10,756 sf.
Design Heating Load: Design Loss at Space: 25,695
Btu/hour
with Distribution Losses: 25,695 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency
and 25% Safety Margin: 39,170 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)
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
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-
Residential
Average Annual Cost/kWh: $0.110/kWh Average Annual Cost/ccf: $0.000/ccf
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03 Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Other Electrical Cooking Clothes Drying Ventilation Fans Service Fees Total Cost Existing Building $2,034 $0 $0 $168 $86 $0 $0 $0 $0 $2,288 With Proposed Retrofits $927 $0 $0 $83 $86 $0 $0 $0 $0 $1,096 SAVINGS $1,107 $0 $0 $85 $0 $0 $0 $0 $0 $1,192
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03 $0$500$1,000$1,500$2,000$2,500Existing RetrofitSpace HeatingOther ElectricalLightingAnnual Energy Costs by End Use
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Anchorage School District Facilities/Maintenance Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Setback
Thermostat:
Portable Building
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Portable Building
space.
$258 $1,000 3.17 3.9
2 Exterior Door:
Portable Building
- Doors
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including
hardware.
$84 $820 2.12 9.7
3 Cathedral Ceiling:
Portable Building
- Hot Roof
Add R-19 to existing
insulation.
$159 $2,520 1.30 15.9
4 Air Tightening Perform air sealing to
reduce air leakage by
30%.
$93 $700 1.16 7.6
5 Window/Skylight:
Portable Building
- Single Pane
Windows
Replace existing window
with U-0.30 vinyl
window
$145 $2,702 0.83 18.6
6 Above-Grade
Wall: Portable
Building - 2x4
Stud Wall
Install R-15 rigid foam
board to exterior and
cover with T1-11 siding
or equivalent.
$340 $8,844 0.80 26
7 Window/Skylight:
Portable Building
- Double Pane
Windows
Replace existing window
with U-0.22 vinyl
window
$86 $2,958 0.45 34.2
8 Lighting: Portable
Lighting
Replace with 20 FLUOR
(2) T8 4' F32T8 28W
Energy-Saver Instant
HighEfficElectronic
$26 $2,000 0.20 76.4
TOTAL $1,192 $21,544 0.93 18.1
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
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 Cathedral Ceiling:
Portable Building
- Hot Roof
Framing Type: Standard
Framing Spacing: 24 inches
Insulated Sheathing: None
Bottom Insulation Layer: R-
19 Batt:FG or RW, 6 inches
Top Insulation Layer: None
Modeled R-Value: 21
Add R-19 to existing
insulation.
$2,520 $159
6 Above-Grade
Wall: Portable
Building - 2x4
Stud Wall
Wall Type: Single Stud
Siding Configuration: Just
Siding
Insul. Sheathing: None
Structural Wall: 2 x 4, 16
inches on center
R-11 Batt:FG or RW, 3.5
inches
Window and door headers:
Not Insulated
Modeled R-Value: 10.6
Install R-15 rigid foam
board to exterior and
cover with T1-11 siding
or equivalent.
$8,844 $340
Exterior Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
2 Exterior Door:
Portable Building
- Doors
Door Type: Metal -
fiberglass or mineral wool
Modeled R-Value: 1.7
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$820 $84
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
5 Window/Skylight:
Portable Building
- Single Pane
Windows
Glass: Single, Glass
Frame: Wood\Vinyl
Spacing Between Layers:
Half Inch
Gas Fill Type: Air
Modeled U-Value: 0.94
Solar Heat Gain Coefficient:
0.52
Replace existing window
with U-0.30 vinyl
window
$2,702 $145
7 Window/Skylight:
Portable Building
- Double Pane
Windows
Glass: Double, glass
Frame: Wood\Vinyl
Spacing Between Layers:
Quarter Inch
Gas Fill Type: Air
Modeled U-Value: 0.56
Solar Heat Gain Coefficient:
0.46
Replace existing window
with U-0.22 vinyl
window
$2,958 $86
Air Leakage
Rank Location Estimated Air Leakage Recommended Air
Leakage Target
Installed
Cost
Annual
Energy
Savings
4 Air Tightness estimated as:
818 cfm at 50 Pascals
Perform air sealing to
reduce air leakage by
30%.
$700 $93
Anchorage School District Facilities/Maintenance Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-03
2. Mechanical Equipment
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
1 Portable Building Existing Unoccupied Heating
Setpoint: 65.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Portable Building
space.
$1,000 $258
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
8 Portable Lighting 20 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 20 FLUOR
(2) T8 4' F32T8 28W
Energy-Saver Instant
HighEfficElectronic
$2,000 $26