HomeMy WebLinkAboutCIRI-ANC-CAEC ASD Warehouse 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 Warehouse
4919 Vanburen Street
Anchorage, AK 99517
p (907) 348-5132
AkWarm ID No. CIRI-ANC-CAEC-05
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 i AkWarm No. CIRI-ANC-CAEC-05
Contents
I. Executive Summary .................................................................................................................. 1
II. Introduction .............................................................................................................................. 5
III. Energy Audit Process ............................................................................................................. 6
IV. Method of Analysis ................................................................................................................. 7
V. Building Description ................................................................................................................ 9
V.I BUILDING ARCHITECTURAL DESCRIPTION ........................................................................................................... 9
V.II BUILDING MECHANICAL DESCRIPTION ............................................................................................................... 9
V.III BUILDING ELECTRICAL DESCRIPTION ............................................................................................................. 10
VI. Historic Energy Consumption and Cost............................................................................. 12
VI.I ELECTRICAL CONSUMPTION DATA ................................................................................................................... 12
VI.II NATURAL GAS CONSUMPTION DATA .............................................................................................................. 12
VI.III OVERALL ENERGY CONSUMPTION DATA ....................................................................................................... 12
VII. Equipment Inventory and Photo Survey .......................................................................... 14
VIII. Energy Conservation Measures ....................................................................................... 15
VIII.I WAREHOUSE ENERGY CONSERVATION MEASURES ....................................................................................... 15
VIII.II 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
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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)
Warehouse building as part of a contract for:
Alaska Housing Finance Corporation
Contact: Rebekah Luhrs
4300 Boniface Parkway
Anchorage, AK 99510
Email: rluhrs@ahfc.us
Anchorage School District
Contact: Calvin Mundt
1301 Labar Street
Anchorage, AK 99515
Email: mundt_calvin@ASDk12.org
This audit was performed using American Recovery and Reinvestment Act (ARRA) funds to promote the
use of innovation and technology to solve energy and environmental problems in a way that improves the
State of Alaska’s economy. This can be achieved through the wiser and more efficient use of energy.
The average January 2009-December 2010 documented annual utility costs at this facility are as follows:
Electricity $55,190
Natural Gas $20,916
Total $76,106
January 2009–December 2010 Energy Utilization Index (EUI) = 61.2 kBtu/sf
January 2009-December 2010 Energy Cost Index = 1.27 $/sf
Energy Conservation Measures (ECMs) calculated to be cost effective are shown below in the Executive
Summary Table with the energy analyst’s best opinion of probable cost, savings, and investment returns.
Be aware that the measures are not 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 VIII for detailed descriptions of all cost effective ECMs.
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Executive Summary – Recommended Energy Conservation Measures (ECMs)
Warehouse Building
Rank Feature Recommendation
Annual
Energy
Savings
Installed
Cost SIR Payback
(years)
0a Refrigerators Replace Refrigerators
older than 5 years old
- - - <10 years
1 Lighting:
Exterior
Lighting
Replace with 12 LED
Light Fixtures
$895 $4500 3.06 5.0
2 Air Tightening Perform air sealing to
reduce air leakage by
30%.
$3,221 $10,000 2.87 3.1
3b HVAC Replace pumps P-3 and
P-31 with new EC
motors
$670 $4,500
c 2.26 6.7
4 Lighting:
Restrooms
Replace with 9 FLUOR
T8 4' F32T8 32W
Electronic Ballast and
Add new Occupancy
Sensors
$201 $1,702 1.82 8.5
5 Lighting: Office
Spaces and
Corridors
Replace with 108
FLUOR T8 4' F32T8
32W Electronic Ballast;
and Add new
Occupancy Sensors
where applicable
$2,237 $18,600 1.82 8.3
6 Ventilation Install new high
efficiency restroom fan
motor that is controlled
based on restroom
occupancy and timer.
Upgrade battery
charging station fan to
new high efficiency
unit.
$572 $4,000 1.75 7
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Executive Summary – Recommended Energy Conservation Measures (ECMs)
Warehouse Building
Rank Feature Recommendation
Annual
Energy
Savings
Installed
Cost SIR Payback
(years)
7b HVAC Remove FAF-1,2,3 and
install AHU-1, 2 and 4
systems per 2007
Mechanical Drawings.
Remove electric heat
from offices and science
kit area.
$10,895 $100,000 1.67 9.2
8 HVAC And
DHW
Add control valves to 19
Unit Heaters and add
VFDs to P-1A and P-1B
$2,148 $20,000 1.65 9.3
9 Lighting:
Warehouse
Replace the
incandescent exit signs
with led source exit
signs and replace all
T12 light fixtures with
T8 and T5HO light
fixtures.
$940 $9,650 1.50 10.3
10 Garage Door:
South Overhead
Door - Hollow
Wood
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$63 $936 1.46 14.8
11 Garage Door:
West Overhead
Doors - Hollow
Wood
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$127 $1,872 1.46 14.8
12b Overhead Door Remove
decommissioned east
facing overhead door
and replace with R-20
minimum wall system.
$80 $1,200 1.33 15
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Executive Summary – Recommended Energy Conservation Measures (ECMs)
Warehouse Building
Rank Feature Recommendation
Annual
Energy
Savings
Installed
Cost SIR Payback
(years)
13 Above-Grade
Wall: Exterior
Walls - Metal
Building with
3.5" FB Over
the Purlin
Install R-13 fiberglass
batts in empty 2x4
cavity.
$3,055 $65,430 1.01 21.4
14 Lighting: Bay
Area Work
Station
Replace with 13
FLUOR T8 4' F32T8
32W Electronic Ballasts
$130 $1,950 1.00 15.0
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.
b ECM item 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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II. Introduction
This energy audit was conducted for the Anchorage School District (ASD) Warehouse building, a 60,000
square feet (sf) building located in Anchorage, AK. 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.
Anchorage, Alaska – Google Maps
ASD Warehouse Building – Google Maps
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III. Energy Audit Process
Prior to visiting the building, 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 VI).
After gathering the utility data and calculating the EUI, the next step in the audit process was to review
the architectural and engineering drawings to develop a building profile which documented building age,
type, usage, and major energy consuming equipment or systems such as lighting, Heating, Ventilating,
and Air Conditioning, (HVAC), water heating, refrigeration, snow-melt, and etc. The building profile is
utilized to generate, and answer, all possible questions regarding the facility’s energy usage. These
questions were then compared to the energy usage profiles developed during the utility data gathering
step. After this information was gathered, the next step in the process was the physical site investigation
(site visit).
The site visit was completed on July 22, 2011 with a follow-up visit on October 6, 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. Derek Bella, foreman at the ASD Warehouse. 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 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. Derek Bell, (907) 742-8644 (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
warehouse, office, and ancillary spaces. An understanding of how the major equipment is used is
determined during the audit.
The collected data was entered into AkWarm Commercial™ software, an energy calculating program for
buildings. The data was processed by AkWarm to model a baseline from which ECMs could be
considered. The model was compared to actual utility costs to ensure the quality of baseline and proposed
energy modeling performed by AkWarm. The recommended ECMs focus on building envelope, HVAC,
lighting, water heating, and other electrical measures that will reduce annual energy consumption.
ECMs are evaluated based on building use and processes, local climate conditions, building construction
type, function, operational schedule, existing conditions, and foreseen future plans. When new equipment
is proposed, energy consumption is calculated based on the manufacturer’s cataloged information where
possible. 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 simple lifetime of the ECM. The total energy savings are calculated as the
total lifetime multiplied by the yearly energy 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
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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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.
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V. Building Description
The ASD Warehouse building is a large 60,000 sf metal frame building containing both warehouse and
office space. The building was constructed in 1973 and is used by the ASD for storing materials used in
the ASD schools. The building is regularly occupied by a total of 40 people from 7am to 5pm everyday
from Monday through Friday, year round.
V.I Building Architectural Description
The construction of the Warehouse is typical of large metal building structures in Anchorage. The exterior
walls utilize large metal framing members with “over-the-purlin”, foil faced, fiberglass batt insulation
draped between the metal purlins. This causes the thickness of the fiberglass insulation to vary from 3-
1/2” at its thickest point, to less than a ½” where it is attached to and compacted flat against the purlins.
The insulation value for this wall system is quite low, as many thermal bridges occur where the purlin and
wall siding compact the batt insulation. See the thermal images of the wall in the Appendix E, to view
these thermal breaks. An effective insulation value of R-8 was estimated for the building’s walls based on
significant thermal bridging. There is 21,600 sf of exterior wall area.
The floor of the building is a 5” thick concrete slab with no under floor insulation. According to original
architectural drawings, the interior side of the foundation wall has 1” EPS rigid insulation that extends
two feet down the wall from the floor. There is 60,000 sf of slab on grade floor area for the building with
an average R-value of R-17.
The roof of the building consists of over-the-purlin, foil faced, fiberglass batt insulation, similar to that of
the exterior walls, with a built up membrane roof over the top. The over-the-purlin insulation varies in
thickness like the exterior walls, with 3-1/2” at its thickest part and less than ½” where it is attached to the
purlins. The insulation in the built up roof above the fiberglass batts could not be visually inspected,
however, it is estimated to be 5” of polyisocyanurate insulation. The total insulation value of the roof
system is R-33.8 and the roof area is 60,180 sf.
The exterior windows of the building are ½” air space, double pane, metal frame windows with no
thermal breaks. The insulation value of the windows was modeled as R-1.2, with 399 sf of window area.
There are several different types of exterior man doors and overhead garage doors in the building. The
west and north man doors are hollow metal doors with paper honeycomb insulation inside (R-1.8). The
two south man doors are metal doors with urethane insulation cores. One of the two south doors has a
double pane half lite window (R-3.3), the other door has no window (R-5.3). There are five overhead
garage doors used for loading and unloading freight from trucks. Two of the overhead doors are new
thermacore doors (R-6.7). The other three doors are hollow wood doors with no insulation (R-1.8).
Currently, the east facing hollow wood door is unused due to the fact that the exterior access to the east
side of the building has been removed. This door is a good candidate for removal and replacement with an
insulated wall.
V.II Building Mechanical Description
A major upgrade to the Warehouse building mechanical system was completed in 2007-2008, which
included adding boilers B-1 and B-2, AHU-3, nineteen ceiling mounted hydronic unit heaters and a large
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ventilation system (EF-1) for the loading dock. These mechanical components are controlled by a new
Siemens APOGEE Direct Digital Control (DDC) system. However, the building’s existing forced air
furnaces (FAF 1,2,3 and 4) were not upgraded and still remain.
The building is heated primarily with one AERCO natural gas fired, high efficiency boiler (B-2). A Weil
McLain dual fuel, gas-oil, boiler (B-1) is used for back up and operates when boiler B-2 cannot meet the
building load, or in an emergency situation when natural gas is unavailable. Currently, the boilers send
heated water to 19 ceiling mounted unit heaters and to a heating coil in AHU-3. The ceiling mounted unit
heaters supply heat to the open warehousing areas. while heated water supplied to AHU-3,via a heat
exchanger, provides heat to the northwest side of the warehouse.
FAF-1, 2, and 3 are gas-fired, forced air furnaces located on the mezzanine above the west office space
and provide tempered supply air to the west offices. The west offices also utilize perimeter electric
resistance baseboard heaters for space heating. The electric baseboards have individual dial thermostats
on the top of the units. The science kit area is an office area inside the south area of the open warehouse.
The workstations in this area are also heated with electric resistance baseboard and electric overhead
heaters. FAF-4 is a gas-fired furnace that supplies tempered air to the science kit area, however, this unit
is currently in a state of disrepair and is not utilized at this time.
The domestic hot water for the building is supplied by two 50 gallon hot water heaters. One water heater
is a State Industries, standard updraft, natural gas fired unit located in the mezzanine area next to FAF-1.
This unit serves the domestic hot water for the west office spaces. The second water heater is an A.O.
Smith electric water heater and is located above the bathrooms adjacent to the science kit area. This unit
provides domestic hot water to the science kit area. The domestic hot water consumption of the building
was estimated at 40 gallons per day, based on typical office usage patterns developed by ASHRAE.
V.III Building Electrical Description
The office spaces in the Warehouse building are comprised of break room areas, private offices, large
multiple occupant offices, conference rooms, copy areas, corridors and restrooms. These areas are
primarily illuminated by fluorescent T12 light fixtures that are controlled by wall mounted rocker
switches. During the site visit it appears that many of these lights remain on the entire time that the
building is occupied even if the particular space is not. The lighting in the private offices, conference
rooms, copy areas, and restrooms could be controlled with occupancy sensors to reduce energy
consumption during unoccupied periods.
The Warehouse section of the building has both high bay storage areas and work stations. The high bay
areas are illuminated with both metal halide and 8' T12 high output fluorescent light fixtures. The high
bay fixtures remain illuminated the entire time that the building is occupied. The work stations in the
warehouse are lit via 4' fluorescent T8 and T12 light fixtures, as well as small task lights; these lights are
all controlled locally with rocker switches. The work station lights appeared to be manually controlled
and were observed during both audits.
Exterior lighting is provided by several small high pressure sodium (HPS) wall pack light fixtures. The
HPS lights are controlled by a photocell that switches the lights off during the day, and then on again for
the duration of the night.
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Other electricity-using equipment not previously described in the mechanical or electrical sections include
a microwave and various breakroom kitchen equipment, and various user equipment such as, computers,
and printers. Significant electrical loads are due to pallet jack and forklift charging stations, which for the
purposes of this audit are considered process loads and cannot easily be optimized or reduced without
impacting workflow of users of the facility.
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VI. Historic Energy Consumption and Cost
Tables provided in Appendix A, Energy Benchmark Data Report, represent the electric and natural gas
energy usage for the surveyed facility from January 2009 to December 2010. Chugach Electric provides
the electricity and ENSTAR provides the natural gas to the facility. Both utilities bill under their
commercial rate schedules.
VI.I Electrical Consumption Data
The electric utility costs consist of several components: a fixed monthly customer charge, an energy usage
charge, fuel surcharge, taxes, and a demand charge. The energy usage and fuel surcharge are based on the
customer's usage as measured in kilowatt-hours (kWh). The usage (kWh) is determined by load wattage
divided by 1,000, times hours running. For example, a 1,000 watt load operating for one hour will use 1
kWh of electricity as would ten, 100 watt lamps operating for one hour or one, 100W lamp operating for
10 hours. One kWh is equivalent to 3,413 BTU. Utility data used in this report reflects the historical data
provided for the building in a summarized format.
VI.II 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”).
VI.III Overall Energy Consumption Data
The overall cost for energy use is calculated by dividing the total cost by the total usage. Based on the
electric and natural gas utility data provided, the average cost for the energy and consumption calculations
at the surveyed facility are summarized in the table below.
Energy Cost and Consumption Data
2009 2010 Average
Electric Rate $0.14 /kWh $0.11 /kWh $0.12 /kWh
Natural Gas Rate $1.02 /CCF $0.94 /CCF $0.98 /CCF
Total Cost $83,060 $69,185 $76,106
ECI $1.38 /sf $1.15 /sf $1.27 /sf
Electric EUI 25.5 kBtu/sf 25.4 kBtu/sf 25.4 kBtu/sf
Natural Gas EUI 35.8 kBtu/sf 35.6 kBtu/sf 35.7 kBtu/sf
Building EUI 61.4 kBtu/sf 61.0 kBtu/sf 61.2 kBtu/sf
The Energy Cost Index (ECI) is derived by dividing the annual cost by the building square footage. The
square footage of the Warehouse building was calculated to be 60,000 sf.
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
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of the relative potential for energy savings. A comparatively low EUI indicates less potential for large
energy savings. Building architectural, mechanical, and electrical drawings were obtained and utilized to
calculate and verify the gross area of the facility. The gross area was confirmed on the physical site
investigation.
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VII. Equipment Inventory and Photo Survey
Following the completion of the field survey a detailed equipment list was created and is attached as
Appendix C. The major equipment listed are considered to be the major energy consuming equipment in
the building whose replacement could yield substantial energy savings.
An approximate age was assigned to the equipment if a manufactured date was not shown on the
equipment’s nameplate. As listed in the 2011 ASHRAE Handbook for HVAC Applications, Chapter 37,
Table 4, the service life for the equipment along with the remaining useful life in accordance to the
ASHRAE standard are also noted in the equipment list.
Where there are zero (0) years remaining in the estimated useful life of a piece of equipment, this is an
indication that maintenance costs are likely on the rise and more efficient replacement equipment is
available which will lower the operating costs of the unit. Maintenance costs should also fall with the
replacement.
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 FLIR300 Infrared Camera. This is
not a thermographic study, but rather several photographs to illustrate easy to identify heat losses. These
photographs are included in Appendix F.
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VIII. Energy Conservation Measures
VIII.I Warehouse Energy Conservation Measures
ECM-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-1 – Upgrade the Exterior Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$895 $4500 3.06 5.0
There are approximately 12 HPS wall pack light fixtures lighting the exterior of the warehouse building.
These light fixtures may be replaced with LED source wall pack fixtures which may result in significant
energy savings.
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 1 and 3 in Appendix D for details of individual
measures.
ECM-2 – Air Tightening
Annual Energy Savings Installed Cost SIR Payback (years)
$3,221 $10,000 2.87 3.1
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. 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. See item 2 in Appendix D for more
information.
Significant air leakage was also found at the four roof vents in the Warehouse building. A photo of the
roof vent is shown in photo 8 in Appendix E. Each vent has a manually operated damper that is opened
and closed with a set of ropes. These dampers do not seal well when closed, and appear to be left open
most of the time. Additionally, these vents are at the highest part of the roof, contributing to heat loss
associated with the stack effect. According to building occupants the vents are rarely needed for
ventilation, as the warehouse doors are opened for cross ventilation and cooling if needed. It is
recommended that these four vents be removed and replaced with an air tight, insulated roof.
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ECM-3 - New EC Pumps for P-3 and P-31
Annual Energy Savings Installed Cost SIR Payback (years)
$670 $4,500 2.26 6.7
The two existing circulation pumps (P-3 and P-31) 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
an $8,300 replacement cost with an annual energy savings of $670, and a simple payback of 12.4 years.
However, upgrading to pumps with EC motors when the existing pumps fail and are in need of repair will
offer a much better payback because the marginal cost of the high efficiency EC motor over the standard
replacement is only a $4,500 repair cost. This repair cost offers a simple payback of 6.7 yrs, resulting in
an SIR of 2.26. The repair upgrade is recommended as it is the most cost effective option. This ECM
item was modeled with a separate AkWarm model and as a result the item is not an additive measure in
AkWarm. It is therefore not included in the final cost savings total in the final AkWarm model in
Appendix D.
ECM-4 – Upgrade the Lighting in the Restrooms
Annual Energy Savings Installed Cost SIR Payback (years)
$201 $1,702 1.82 8.5
There are two bathrooms in the warehouse building with a small hallway that connects them with the
warehouse floor. Energy savings can be experienced if the approximately nine fluorescent T12 light
fixtures are upgraded with T8 lamps and controlled by three occupancy sensors.
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, 6, 9, 13, and 27 in Appendix D for details of
individual measures.
Note – AkWarm measures with SIRs less than one were included in this compiled annual energy savings,
installed cost, SIR, and payback of this since they should be upgraded congruently.
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ECM-5 – Upgrade the Lighting and Control Systems in the Office Spaces, and Corridors
Annual Energy Savings Installed Cost SIR Payback (years)
$2,237 $18,600 1.82 8.3
Upgrading the lighting in the office spaces and corridors includes replacing and retrofitting approximately
100 four lamp, and eight 2-lamp fluorescent T12 light fixtures with T8 light fixtures equipped with
program start electronic ballasts. Approximately nine occupancy sensors could be used to control
approximately 63 fixtures in small offices, conference and copy room type areas for additional savings.
The remaining 45 fixtures would be controlled with the existing manual switches because they illuminate
common use areas that should not be controlled by occupancy sensors.
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 4, 7, 8, 10, 15, 23, and 29 in Appendix D for
details of individual measures.
Note – AkWarm measures with SIRs less than one were included in this compiled annual energy savings,
installed cost, SIR, and payback of this since they should be upgraded congruently.
ECM-6 – Upgrade Exhaust Fans for Restrooms and Charging Station
Annual Energy Savings Installed Cost SIR Payback (years)
$572 $4,000 1.75 7
Significant savings exist by upgrading the fan motors of the restroom fan and charging station fan and
controlling the run time of the restroom fan. Currently, the existing restroom fan operates continuously.
Replacing the old fan motor with a new, high-efficiency, motor will save electricity consumption. Also,
adding restroom occupancy and timer control to the restroom exhaust fan will allow it to shut off during
times when it is not needed. This will reduce the amount of heated air leaving the building envelope and
therefore reduce the natural gas and electricity needed to heat incoming air. Replacing the existing fan
motor of the exhaust fan at the battery charging station will also reduce electrical consumption. See item
11 in Appendix D for more information.
ECM-7 – Remove Forced Air Furnaces and Install New AHUs
Annual Energy Savings Installed Cost SIR Payback (years)
$10,895 $100,000 1.67 9.2
The office space and science kit area of the Warehouse are heated with perimeter electric baseboards.
Electric heat is expensive compared to heating with natural gas and significant cost savings can be
achieved by switching from electric to natural gas heating in these office areas. Also, due to the fact that
each electric baseboard register has an individual thermostat, controlling the heat in the office spaces is
difficult. Night setback control is difficult with the existing electric baseboards. The office spaces are also
being supplied with tempered supply air through four natural gas-fired forced air furnaces (FAF-1, 2, 3,
and 4). However, these furnaces are old with low combustion efficiencies.
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A solution to the issues mentioned above, would be to follow through with the remaining upgrades shown
in the “Heating System Upgrades for ASD Warehouse” mechanical design, dated 11/26/2007. This
mechanical design was only halfway constructed in 2008, which included the successful completion of a
new boiler room, new boilers, ceiling hydronic unit heaters and AHU-3. However, the mechanical design
for removing FAF-1, 2, and 3 and installing AHU-1, 2 and 4, with hydronic heating coils utilizing heat
from the new boilers, was never completed. Instead the insulated copper hydronic lines running to the
proposed locations of AHU-1, 2 and 4 were stubbed-off, for future completion of the project. By
continuing with the heating system upgrades shown in the 2007 mechanical design, the amount of natural
gas used will be reduced as the heat generated by the inefficient forced air furnaces will be replaced by
the heat produced from the high efficiency boiler system. The heat will be delivered via the hydronic
heating coils in the new AHUs. Also, if adequately designed, the heat supplied by the new AHUs would
have the ability to offset the need for electric heating by the electric baseboards in the office areas. If the
heating coils in the AHUs were used as the primary heat source for the office space then the need for
electric baseboard would be eliminated, resulting in significant electrical savings. Once this system is
installed, additional savings can be realized by adding set back thermostats to reduce temperatures in the
office space during unoccupied times. This ECM item 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 -8 – Add Control Valves to Unit Heaters and Add VFDs to Main Circ Pumps
Annual Energy Savings Installed Cost SIR Payback (years)
$2,148 $20,000 1.65 9.3
The existing ceiling mounted hydronic unit heaters that supply heat to the open warehousing area are
piped in an inefficient manner. Currently, the main circulation pumps, P-1A and P-1B, pump hot water
through the radiators of the unit heaters constantly, regardless of the temperature found in each unit
heater’s zone. This results in unneeded heat radiating out of the unit heater radiators. This also wastes
pumping energy required to push water through the unneeded radiators. See Appendix F for a
thermographic photo of the waste heat coming off the unit heater. It is recommended that 2-way control
valves be added to the unit heaters, with a by-pass at the end of each line. The thermostatically operated
control valves will stop heated water from entering the unit heater’s radiator when the zone is not calling
for heat, in turn reducing the amount of waste heat produced by the unit heaters. It is recommended that
VFDs be installed on pumps P-1A and P-1B so that the pumps can modulate in order to satisfy the
heating load of the system. This will reduce electricity used for pumping. See item 14 in Appendix D for
more information.
ECM-9 – Upgrade the Lighting in the Warehouse
Annual Energy Savings Installed Cost SIR Payback (years)
$940 $9650 1.50 10.3
Upgrading the lighting in the warehouse would include replacing the approximately two 4’ two lamp
wrap around fluorescent T12 light fixtures with two lamp T8 light fixtures, and replacing the
approximately two incandescent emergency exit signs with LED source emergency exit signs.
Additionally the fluorescent T12 high bay light fixtures may be replaced with 4 lamp fluorescent T5HO
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high bay light fixtures. The cost of upgrading the fluorescent T12 lamps disregards much of the
installation cost as it is assumed that the replacement will take place upon lamp failure, so much of the
labor cost may be absorbed as a maintenance cost. Other possible upgrades were explored such as
replacing the high bay metal halide light fixtures with fluorescent T5HO light fixtures but the upgrades
did not prove to be cost effective.
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 12, 16 and 19 in Appendix D for details of
individual measures.
ECM-10 – Replace One South Facing Wood Overhead Garage Door
Annual Energy Savings Installed Cost SIR Payback (years)
$63 $936 1.46 14.8
There is one south facing, 8’ x 10’ hollow wood overhead garage door in the Warehouse that is un-
insulated (R-1.8). It is recommended that the door be removed and replaced with a new R-7 minimum, 2”
polyurethane core garage door. The door should have adequately installed brush weather-stripping and
rubber bottom gaskets to prevent air infiltration around the perimeter of the door. See item 17 in
Appendix D for more information.
ECM-11 – Replace Two West Facing Wood Overhead Garage Doors
Annual Energy Savings Installed Cost SIR Payback (years)
$127 $1,872 1.46 14.8
There are two west facing, 8’ x 10’ hollow wood overhead garage doors in the Warehouse 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. The doors should have adequately installed brush weather-stripping and
rubber bottom gaskets to prevent air infiltration around the perimeter of the doors. See item 18 in
Appendix D for more information.
ECM-12 – Replace East Facing Wood Overhead Door with Insulated Wall
Annual Energy Savings Installed Cost SIR Payback (years)
$80 $1,200 1.33 15
The Warehouse has one east facing, 8’ x 10’ hollow wood overhead garage door which is un-insulated
(R-1.8). This door is not used anymore because exterior access to the decommissioned railroad tracks on
the east side of the building is no longer needed. This door is contributing to heat loss and should be
removed and replaced with an R-20 minimum insulated wall. Installing an insulated wall will reduce air
leakage and conductive heat loss. See photo 6 in Appendix E for a picture of the unused door. This ECM
item 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-13 – Install R-13 Minimum Insulation to All Exterior Walls
Annual Energy Savings Installed Cost SIR Payback (years)
$3,055 $65,430 1.01 21.4
Due to the metal building construction and over-the-purlin insulation in the warehouse, the exterior walls
are poorly insulated with an effective insulation value of R-8. It is recommended that an additional layer
of R-13 minimum insulation be added to the inside face of all exterior walls. Insulating metal buildings
such as the Warehouse can be done with pre-made, vinyl faced fiberglass insulation ordered from a
manufacturer. The insulation is made to fit in the space between the purlins over the inside face of the
existing wall insulation. The tabs on the vinyl faces can be taped to create a new vapor barrier. Significant
savings can be achieved by increasing the insulation of the walls of the building envelope. See item 22 in
Appendix D for more information.
ECM-14 – Upgrade the Lighting in the Warehouse Bay Area Work Stations
Annual Energy Savings Installed Cost SIR Payback (years)
$130 $1,950 1.00 15.0
The warehouse bay area houses several work stations. Upgrading the lighting in these areas would include
upgrading approximately 13 fluorescent T12 light fixtures to use T8 sources. Additionally there is an
incandescent desk lamp that may be re-lamped with a compact fluorescent or LED lamp.
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 20, 21, 26, and 30 in Appendix D for details of
individual measures.
Note – AkWarm measures with SIRs less than one were included in this compiled annual energy savings,
installed cost, SIR, and payback of this since they should be upgraded congruently.
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VIII.II 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 Warehouse Draft Energy Audit Report
First Name Last Name Middle Name Phone
Steven Golab 348-5132
State Zip
AK
Monday-
Friday
Saturday Sunday Holidays
08:00-5:00
Average # of
Occupants
During
Renovations
Date
ASD Warehouse Warehousing and Wholesale 60,000
Year Built
Building Name/ Identifier Building Usage Building Square Footage
Facility Address
Building Type
Mixed
Community Population
Facility City
1973
REAL Preliminary Benchmark Data Form
PART I – FACILITY INFORMATION
Facility Owner
MOA
Facility Owned By Date
03/14/11Municipal Government/Subdivision
4919 Vanburen St Anchorage
Primary
Operating
Hours
Contact Person
City
Anchorage
Mailing Address
Facility Zip
261,500
99517
Email
Golab_Steven@asdk12.org
Details
PART II – ENERGY SOURCES
Heating Oil Electricity Natural Gas Propane Wood Coal
$ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton
Other energy
sources?
Describe
1. Please check every energy source you use in the table below. If known, please enter the base rate you pay
for the energy source.
2. Provide utilities bills for the most recent two-year period for each energy source you use.
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Anchorage School District Warehouse Draft Energy Audit Report
ASD Warehouse
Buiding Size Input (sf) =60,000
2009 Natural Gas Consumption (Therms)21,506.00
2009 Natural Gas Cost ($)21,880
2009 Electric Consumption (kWh)448,404
2009 Electric Cost ($)61,180
2009 Total Energy Use (kBtu)3,681,003
2009 Total Energy Cost ($)83,060
Annual Energy Use Intensity (EUI)
2009 Natural Gas (kBtu/sf) 35.8
2009 Electricity (kBtu/sf)25.5
2009 Energy Utilization Index (kBtu/sf)61.4
Annual Energy Cost Index (ECI)
2009 Natural Gas Cost Index ($/sf)0.36
2009 Electric Cost Index ($/sf)1.02
2009 Energy Cost Index ($/sf)1.38
2010 Natural Gas Consumption (Therms)21,342.00
2010 Natural Gas Cost ($)19,958
2010 Electric Consumption (kWh)446,2632010 Electric Consumption (kWh)446,263
2010 Electric Cost ($)49,227
2010 Total Energy Use (kBtu)3,657,296
2010 Total Energy Cost ($)69,185
Annual Energy Use Intensity (EUI)
2010 Natural Gas (kBtu/sf)35.6
2010 Electricity (kBtu/sf)25.4
2010 Energy Utilization Index (kBtu/sf)61.0
Annual Energy Cost Index (ECI)
2010 Natural Gas Cost Index ($/sf)0.33
2010 Electric Cost Index ($/sf)0.82
20010 Energy Cost Index ($/sf)1.15
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 WarehouseDraft Energy Audit ReportASD WarehouseNatural GasBtus/CCF =100,000Provider Meter # Month Start Date End Date Billing Days Consumption (CCF) Consumption (Therms) Demand Use Natural Gas Cost ($) Unit Cost ($/Therm) Demand Cost ($)Enstar NGC152813 Jan-09 01/08/09 02/06/09293,6613,661$3,735$1.02Enstar NGC152813 Feb-09 02/06/09 03/05/09273,0373,037$3,109$1.02Enstar NGC152813 Mar-09 03/05/09 04/07/09332,9532,953$3,022$1.02Enstar NGC152813 Apr-09 04/07/09 05/06/09291,6681,668$1,737$1.04Enstar NGC152813 May-09 05/06/09 06/08/0933703703$767$1.09Enstar NGC152813 Jun-09 06/08/09 07/08/0930472472$536$1.14Enstar NGC152813 Jul-09 07/08/09 08/06/0929325325$394$1.21Enstar NGC152813 Aug-09 08/06/09 09/08/0933311311$374$1.20Enstar NGC152813 Sep-09 09/08/09 10/07/0929734734$800$1.09Enstar NGC152813 Oct-09 10/07/09 11/05/09291,4761,476$1,549$1.05Enstar NGC152813 Nov-09 11/05/09 12/04/09293,1263,126$3,202$1.02Enstar NGC152813 Dec-09 12/04/09 01/07/10343,0403,040$2,655$0.87Enstar NGC152813 Jan-10 01/07/10 02/05/10293,4543,454$2,924$0.85Enstar NGC152813 Feb-10 02/05/10 03/08/10312,2852,285$1,949$0.85Enstar NGC152813 Mar-10 03/08/10 04/07/10302,4532,453$2,112$0.86Enstar NGC152813 Apr-10 04/07/10 05/06/10291,6631,663$1,458$0.88Enstar NGC152813 May-10 05/06/10 06/04/1029793793$734$0.93Enstar NGC152813Jun-1006/04/1007/06/1032368368$372$1.01Enstar NGC152813Jun-1006/04/1007/06/1032368368$372$1.01Enstar NGC152813 Jul-10 07/06/10 08/06/1031387387$616$1.59Enstar NGC152813 Aug-10 08/06/10 09/07/1032431431$697$1.62Enstar NGC152813 Sep-10 09/07/10 10/07/1030935935$1,104$1.18Enstar NGC152813 Oct-10 10/07/10 11/03/10271,7961,796$1,842$1.03Enstar NGC152813 Nov-10 11/03/10 12/07/10342,9892,989$2,718$0.91Enstar NGC152813 Dec-10 12/07/10 01/06/11303,7883,788$3,432$0.91Jan - 09 to Dec - 09 total:21,50621,5060$21,880$0Jan - 10 to Dec - 10 total:21,34221,3420$19,958$0$1.07$1.05Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Coffman Engineers, Inc.AkWarm No. CIRI-ANC-CAEC-05Anchorage School District Warehouse Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-05 Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Anchorage School District WarehouseDraft Energy Audit Report$1,500$2,000$2,500$3,000$3,500$4,0001,5002,0002,5003,0003,5004,000Natural Gas Cost ($)Natural Gas Consumption (Therms)ASD Warehouse - Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)Natural Gas Consumption (Therms)Natural Gas Cost ($)Coffman Engineers, Inc.AkWarm No. CIRI-ANC-CAEC-05$0$500$1,00005001,000Jan-09 Mar-09 May-09 Jul-09 Sep-09 Nov-09 Jan-10 Mar-10 May-10 Jul-10 Sep-10 Nov-10Natural Gas Consumption (Therms)Date (Mon - Yr)Anchorage School District Warehouse Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-05 Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Anchorage School District WarehouseDraft Energy Audit ReportASD WarehouseElectricityBtus/kWh =3,413Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)Chugach Electric 1-15162842 Jan-09 12/26/2008 1/26/200931 46,192 1,577134 $6,959$0.15$1,145.72Chugach Electric 1-15162842 Feb-09 1/26/2009 2/28/20093335,2971,205134 $5,541$0.16$1,487.40Chugach Electric 1-15162842 Mar-09 2/28/2009 3/26/20092648,3921,652122 $7,302$0.15$1,358.64Chugach Electric 1-15162842 Apr-09 3/26/2009 4/24/20092935,5631,214117 $5,173$0.15$1,207.68Chugach Electric 1-15162842 May-09 4/24/2009 5/29/20093531,5901,078117 $4,678$0.15$1,301.36Chugach Electric 1-15162842 Jun-09 5/29/2009 6/24/20092634,8481,189104 $5,031$0.14$1,149.96Chugach Electric 1-15162842 Jul-09 6/24/2009 7/27/20093329,9421,02296 $3,807$0.13$1,070.04Chugach Electric 1-15162842 Aug-09 7/27/2009 8/25/20092932,0171,09398 $4,097$0.13$1,038.96Chugach Electric 1-15162842 Sep-09 8/25/2009 9/24/20093034,5001,177103 $4,277$0.12$1,083.36Chugach Electric 1-15162842 Oct-09 9/24/2009 10/23/20092940,5081,383116 $4,803$0.12$1,191.45Chugach Electric 1-15162842 Nov-09 10/23/2009 11/25/20093339,4571,347116 $4,692$0.12$1,339.80Chugach Electric 1-15162842 Dec-09 11/25/2009 12/23/20092840,0981,369118 $4,820$0.12$1,339.80Chugach Electric 1-15162842 Jan-10 12/23/2009 1/25/20103340,7651,391121.0 $4,415$0.11$1,367.62Chugach Electric 1-15162842 Feb-10 1/25/2010 2/24/20103038,5711,316121.0 $4,239$0.11$1,400.07Chugach Electric 1-15162842 Mar-10 2/24/2010 3/25/20102941,7941,426115.2 $4,610$0.11$1,335.17Chugach Electric 1-15162842 Apr-10 3/25/2010 4/26/20103237,8861,293110.4 $4,258$0.11$1,279.54Chugach Electric 1-15162842 May-10 4/26/2010 5/26/20103034,2091,16899.2 $3,962$0.12$1,149.73Chugach Electric1-15162842Jun-105/26/20106/25/20103029,7811,01697.0$3,519$0.12$1,112.64Chugach Electric1-15162842Jun-105/26/20106/25/20103029,7811,01697.0$3,519$0.12$1,112.64Chugach Electric 1-15162842 Jul-10 6/25/2010 7/27/20103218,47663197.2 $2,534$0.14$1,126.55Chugach Electric 1-15162842 Aug-10 7/27/2010 8/26/20103052,3051,78598.0 $5,053$0.10$1,084.82Chugach Electric 1-15162842 Sep-10031,9011,089103.0 $3,499$0.11Chugach Electric 1-15162842 Oct-10036,4241,243117.0 $3,990$0.11Chugach Electric 1-15162842 Nov-10 10/28/2010 11/29/20103239,2251,339122.0 $4,238$0.11Chugach Electric 1-15162842 Dec-10044,9261,533124.0 $4,910$0.11Jan - 09 to Dec - 09 total:448,40415,3041,375$61,180$14,714Jan - 10 to Dec - 10 total:446,26315,2311,325$49,227$9,856$0.14$0.11Jan - 09 to Dec - 09 avg:Jan - 10 to Dec - 10 avg:Coffman Engineers, Inc.AkWarm No. CIRI-ANC-CAEC-05Anchorage School District Warehouse Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-05 Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Anchorage School District WarehouseDraft Energy Audit Report$3,000$4,000$5,000$6,000$7,000$8,00020,00030,00040,00050,00060,000Electric Cost ($)Electric Consumption (kWh)ASD Warehouse - Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)Coffman Engineers, Inc.AkWarm No. CIRI-ANC-CAEC-05$0$1,000$2,000010,000Jan-09Feb-09Mar-09Apr-09May-09Jun-09Jul-09 Aug-09Sep-09Oct-09Nov-09Dec-09Jan-10Feb-10Mar-10Apr-10May-10Jun-10Jul-10 Aug-10Sep-10Oct-10Nov-10Dec-10Date (Mon - Yr)Anchorage School District Warehouse Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. CIRI-ANC-CAEC-05 Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Appendix B
AkWarm Commercial Reports
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 11/3/2011
10:33 AM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Anchorage School District Warehouse Auditor Company: Coffman Engineers
Address: 4919 Vanburen St 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:
Client Phone: (907) 348-5221 Auditor Comment:
Client FAX:
Design Data
Building Area: 60,000 square feet Design Heating Load: Design Loss at Space:
1,433,805 Btu/hour
with Distribution Losses: 1,433,805 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency
and 25% Safety Margin: 2,185,679 Btu/hour
Note: Additional Capacity should be added for DHW
load, if served.
Typical Occupancy: 40 people Design Indoor Temperature: 61.5 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
Utility Information
Electric Utility: Chugach Electric - Commercial
- Sm
Natural Gas Provider: Enstar Natural Gas -
Commercial - Sm
Average Annual Cost/kWh: $0.120/kWh Average Annual Cost/ccf: $0.980/ccf
Anchorage School District Warehouse Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05 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 $38,867 $0 $563 $23,808 $4,477 $0 $0 $7,015 $0 $74,730With Proposed Retrofits $30,215 $0 $563 $17,098 $4,477 $0 $0 $6,412 $0 $58,766SAVINGS $8,652 $0 $0 $6,709 $0 $0 $0 $602 $0 $15,963
Anchorage School District Warehouse Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05 $0$20,000$40,000$60,000$80,000Existing RetrofitVentilation and FansSpace HeatingOther ElectricalLightingDomestic Hot WaterAnnual Energy Costs by End Use
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Appendix C
Major Equipment List
Anchorage School District Warehouse Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) NOTES B-1 Boiler Rm Permanent Backup Boiler Weil McLain 988 Dual Fuel, Gas-Oil, Cast Iron Boiler 2,713 MBH Input 80% AFUE Estimated 2 HP 30 27 B-2 Boiler Rm Permanent Primary Boiler AERCO BMK 2.0 Condensing Gas Boiler with 20:1 Turndown 2,000 MBH Input 92% AFUE Estimated - 30 27 WH-1 Mezzanine Domestic Hot Water State GS650YRRT5 Gas Fired, Standard Updraft 65 MBH Input 50 gal 70% AFUE Estimated - 15 8 WH-2 Science Kit Area Domestic Hot Water A.O. Smith Dura-Power Electric 9 kW 50 gal 100% Electric N/A 15 0 FAF-1 Above Kitchen and Restrooms Ventilation and Space Heat Lennox No Name-plate Gas Fired, Forced Air Furnace 75 MBH Estimated 65% AFUE Estimated 2 HP Estimated 25 0 Appears to be 1980 Vintage FAF-2 Above Conference Room in Mezzanine Ventilation and Space Heat Lennox GS180E-50 Gas Fired, Forced Air Furnace 50 MBH 65% AFUE Estimated 1 HP Estimated 25 0 Built 1983 FAF-3 Southern Mezzanine Ventilation and Space Heat Lennox GS1804/5E-140-2 Gas Fired, Forced Air Furnace 140 MBH 65% AFUE Estimated 2 HP Estimated 25 0 Built 1983 FAF-4 Science Kit Area Ventilation and Space Heat Modine DJE75AB11 Gas Fired, Forced Air Furnace 75 MBH - - 25 0 Unit is currently shut down and not used. GUH-1 Warehouse/ Loading Dock Space Heat Reznor No Name-plate Gas Fired Unit Heater - 65% AFUE Estimated ½ HP Estimated 13 0 Off in summer. 55F Set point in winter.
Anchorage School District Warehouse Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) NOTES AHU-3 Boiler Rm Warehouse Trane MCC Size 12 Hydronic Heating Coil. Centrifugal fan with variable speed drive. 5,000 CFM 2.0” Motor: 89.5% Eff. 76.8 PF 5 HP 3 PH 25 22 A.O. Smith Century E-Plus 3 Motor EF-1 Loading Dock Loading Dock Exhaust Green-heck CWB-200-20 Axial Fan 5,000 CFM 1.0” 75% Estimated 2 HP 25 22 EF-3 Boiler Rm Boiler Room Ventilation Green-heck CSP-A110 Centrifugal Fan 100 CFM 0.25” 75% Estimated 51 W 25 22 EF-5 Southeast Ware-house Ventilation No Name-plate - Axial Fan - - ½ HP Estimated 20 Age unknown Unit is kept in off position. Restroom Exhaustd Above kitchen and bathrooms Bathroom Exhaust Dayton Motor - Centrifugal Fan - 65% Estimated ¾ HP 25 0 Appears to be 1980 vintage. Charging Station Fane Battery Charging Station Exhausts fumes from charging station No Name-plate - Axial Fan - 65% Estimated 1 HP Estimated 20 0 Appears to be 1980 vintage. SF-1 Boiler Rm Boiler Room Ventilation Green-heck CSP-A110 Centrifugal Fan 100 CFM 0.25” 75% Estimated 51 W 25 22 d Exhaust fan name not found during site visit. e Exhaust fan name and nameplate not found during site visit. Fan is on timer and is operated 6-8 hrs per day to vent fumes while forklift batteries charge.
Anchorage School District Warehouse Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) NOTES CF-1 Boiler B-1 Combustion air for Boiler B-1 Tjernlund PAI-6 Centrifugal Fan - 75% Estimated 1/3 HP 25 22 Inter-locked with Boiler B-1. UH-1 Warehouse Space Heat (19 Total) Trane 252-P Hydronic Radiator with Axial Fan 132 MBH 4,162 CFM 75% Estimated 1/4 HP 20 17 P-1A Boiler Rm Main Circ Pump Baldor Motor Super-E Base-Mounted 215 GPM 70’ 91.7% Eff. 79% PF 7.5 HP 3 PH 20 16 P-1B Boiler Rm Main Circ Pump Baldor Motor Super-E Base-Mounted 215 GPM 70’ 91.7% Eff. 79% PF 7.5 HP 3 PH 20 16 P‐2 Boiler Rm Boiler B‐1 Circ Baldor Motor Super‐E Inline 180 GPM 30’ 86.5% Eff. 82% PF 2 HP 3 PH 10 6 P‐3 Boiler Rm Boiler B‐2 Circ Baldor Motor Super‐E Inline 180 GPM 30’ 86.5% Eff. 82% PF 2 HP 10 6 P‐31 Above Boiler Rm HX‐31 to AHU‐3 Circ Emerson P63CKA‐2740 Inline 40 GPM 30’ 75% Estimated ¾ HP 3 PH 10 6
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Appendix D
Energy Conservation Measures
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual
Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Lighting:
Exterior Lighting
Replace with 9 LED 115W
Module StdElectronic
$743 $3,600 3.18 4.8
2 Air Tightening Perform air sealing to reduce air
leakage by 30%.
$3,221 $10,000 2.87 3.1
3 Lighting:
Exterior Lighting
Replace with 3 LED 72W
Module StdElectronic
$152 $900 2.60 5.9
4 Lighting: Lightly
Used Office
Spaces
Replace with 10 FLUOR (4) T8
4' F32T8 32W Standard Program
StdElectronic and Add new
Occupancy Sensor
$290 $1,800 2.46 6.2
5 Lighting:
Restrooms
Replace with FLUOR (4) T8 4'
F32T8 32W Standard Program
StdElectronic and Add new
Occupancy Sensor
$24 $151 2.44 6.3
6 Lighting:
Restrooms
Replace with 2 FLUOR (4) T8 4'
F32T8 32W Standard Program
StdElectronic and Add new
Occupancy Sensor
$70 $450 2.40 6.4
7 Lighting:
Corridor
Replace with 4 FLUOR (4) T8 4'
F32T8 32W Standard Program
StdElectronic
$91 $600 2.33 6.6
8 Lighting: Office
Spaces
Replace with 52 FLUOR (4) T8
4' F32T8 32W Standard Program
StdElectronic and Add new
Occupancy Sensor
$1,311 $9,600 2.08 7.3
9 Lighting:
Restrooms
Replace with 2 FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic and Add new
Occupancy Sensor
$38 $301 1.95 7.9
10 Lighting: Large
Office Spaces
Replace with 28 FLUOR (4) T8
4' F32T8 32W Standard Program
StdElectronic
$485 $4,200 1.76 8.7
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual
Energy
Savings
Installed
Cost
SIR Payback
(Years)
11 Ventilation Install new high efficiency
restroom fan motor that is
controlled based on restroom
occupancy and timer. Upgrade
battery charging station fan to
new high efficiency unit.
$572 $4,000 1.75 7
12 Lighting:
Warehouse
Replace with 2 LED 4W Module
StdElectronic
$39 $350 1.73 8.9
13 Lighting:
Restrooms
Replace with 3 FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic and Add new
Occupancy Sensor
$57 $525 1.68 9.2
14 HVAC And
DHW
Add control valves to 19 Unit
Heaters and add VFDs to P-1A
and P-1B
$2,148 $20,000 1.65 9.3
15 Lighting:
Corridor
Replace with 7 FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic
$91 $875 1.60 9.6
16 Lighting:
Warehouse
Replace with 36 FLUOR (4) T5
45.2" F28T5 28W Standard
StdElectronic
$932 $9,000 1.58 9.7
17 Garage Door:
South Overhead
Door - Hollow
Wood
Replace existing garage door
with R-7, 2" polyurethane core
replacement door.
$63 $936 1.46 14.8
18 Garage Door:
West Overhead
Doors - Hollow
Wood
Replace existing garage door
with R-7, 2" polyurethane core
replacement door.
$127 $1,872 1.46 14.8
19 Lighting:
Warehouse
Replace with 2 FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic
$26 $300 1.33 11.5
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual
Energy
Savings
Installed
Cost
SIR Payback
(Years)
20 Lighting: Bay
Area Work
Station
Replace with 2 FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic
$21 $250 1.31 11.8
21 Lighting: Bay
Area Work
Station
Replace with 9 FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic
$96 $1,350 1.09 14.1
22 Above-Grade
Wall: Exterior
Walls - Metal
Building with
3.5" FB Over the
Purlin
Install R-13 fiberglass batts in
empty 2x4 cavity.
$3,055 $65,430 1.01 21.4
23 Lighting: Room
105
Replace with 6 FLUOR (4) T8 4'
F32T8 32W Standard Program
StdElectronic
$54 $900 0.92 16.7
24 Exterior Door:
West and North
Entry Doors
Remove existing door and install
standard pre-hung U-0.16
insulated door, including
hardware.
$85 $2,050 0.90 24.1
25 Lighting: 2nd
Floor Warehouse
Replace with 28 FLUOR (2) T8
4' F32T8 32W Standard Program
StdElectronic
$183 $3,500 0.80 19.1
26 Lighting: Bay
Area Work
Station
Replace with FLUOR CFL,
Spiral 20 W
$6 $50 0.72 8.9
27 Lighting:
Restrooms
Replace with FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic and Add new
Occupancy Sensor
$12 $275 0.67 23.1
28 Lighting: Lightly
Used Warehouse
Replace with 8 FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic
$34 $1,000 0.53 29.2
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual
Energy
Savings
Installed
Cost
SIR Payback
(Years)
29 Lighting: Lightly
Used Office
Spaces
Replace with FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic and Add new
Occupancy Sensor and Improve
Manual Switching
$19 $625 0.45 33.6
30 Lighting: Bay
Area Work
Station
Replace with 2 FLUOR T8 4'
F32T8 32W Standard Program
StdElectronic
$7 $300 0.34 44.9
31 Exterior Door:
South Entry Door
- Half Lite
Remove existing door and install
standard pre-hung U-0.16
insulated door, including
hardware.
$6 $410 0.32 66.7
32 Window/Skylight
: West Windows
Replace existing window with
U-0.30 vinyl window
$299 $14,778 0.32 49.4
33 Lighting:
Utility/Storage
Replace with 2 FLUOR CFL,
Spiral 20 W
$2 $100 0.32 48.4
34 Window/Skylight
: South Windows
Replace existing window with
U-0.30 vinyl window
$70 $3,633 0.31 51.8
35 Lighting:
Warehouse
Replace with 81 FLUOR (6) T5
45.2" F54W/T5 HO Standard
StdElectronic
$702 $40,000 0.27 57
36 Cathedral
Ceiling: Hot
Roof
Install R-5 rigid board
insulation. No cost included for
covering insulation.
$778 $90,872 0.19 116.8
37 On- or Below-
Grade Floor,
Perimeter: Floor -
Perimeter
Install 2' of R-5 rigid board
insulation around perimeter of
Slab (vertical or horizontal).
$48 $6,652 0.16 138.1
38 Lighting:
Utility/Storage
Replace with FLUOR (4) T8 4'
F32T8 32W Standard Program
StdElectronic
$1 $150 0.13 121.1
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual
Energy
Savings
Installed
Cost
SIR Payback
(Years)
39 Lighting:
Utility/Storage
Replace with FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic
$1 $125 0.09 176.8
40 Exterior Door:
South Entry Door
Remove existing door and install
standard pre-hung U-0.16
insulated door, including
hardware.
$1 $410 0.07 295.6
41 Lighting: 2nd
Floor
Storage/Mechani
cal
Replace with 4 FLUOR (2) T8 4'
F32T8 32W Standard Program
StdElectronic
$2 $500 0.06 267.8
42 Lighting:
Utility/Storage
Replace with FLUOR (4) T8 4'
F32T8 32W Standard Program
StdElectronic
$0 $150 0.05 304.8
TOTAL $15,963 $302,969 0.82 19
Note:
ECM #3, 7, and 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
#3, 7, and 12 from the Executive Summary are not additive measures in AkWarm and therefore is not
included in Appendix D.
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
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
22 Above-
Grade Wall:
Exterior
Walls -
Metal
Building
with 3.5" FB
Over the
Purlin
Wall Type: Single Stud
Siding Configuration: Just
Siding
Insul. Sheathing: None
Structural Wall: 2 x 4, 24
inches on center
Fiberglass/Loose fill, 2.2
inches
Window and door headers: Not
Insulated
Modeled R-Value: 8
Install R-13 fiberglass
batts in empty 2x4
cavity.
$65,430 $3,055
36 Cathedral
Ceiling: Hot
Roof
Framing Type: I-Beam (TJI)
Framing Spacing: 24 inches
Insulated Sheathing:
Fiberglass/Loose fill, 0.65
inches
Bottom Insulation Layer: None
Top Insulation Layer:
Polyisocyanurate (PISO), 5
inches
Modeled R-Value: 33.8
Install R-5 rigid board
insulation. No cost
included for covering
insulation.
$90,872 $778
37 On- or
Below-Grade
Floor,
Perimeter:
Floor -
Perimeter
Insulation for 0' to 2' Perimeter:
EPS (Beadboard), 1 inches
Insulation for 2' to 4' Perimeter:
None
Modeled R-Value: 8.2
Install 2' of R-5 rigid
board insulation around
perimeter of Slab
(vertical or horizontal).
$6,652 $48
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Exterior Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
17 Garage Door:
South Overhead
Door - Hollow
Wood
Door Type: Uninsulated Wood
Door
Insulating Blanket: None
Modeled R-Value: 1.8
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$936 $63
18 Garage Door: West
Overhead Doors -
Hollow Wood
Door Type: Uninsulated Wood
Door
Insulating Blanket: None
Modeled R-Value: 1.8
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$1,872 $127
24 Exterior Door:
West and North
Entry Doors
Door Type: Metal 1-3/4",
paper honeycomb core
Modeled R-Value: 1.8
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$2,050 $85
31 Exterior Door:
South Entry Door -
Half Lite
Door Type: Metal/PU half lite
Modeled R-Value: 3.3
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$410 $6
40 Exterior Door:
South Entry Door
Door Type: Metal - urethane,
therm. break
Modeled R-Value: 5.3
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$410 $1
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
32 Window/Skylight:
West 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
Replace existing window
with U-0.30 vinyl window
$14,778 $299
34 Window/Skylight:
South 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
Replace existing window
with U-0.30 vinyl window
$3,633 $70
Air Leakage
Rank Location Estimated Air Leakage Recommended Air
Leakage Target
Installed
Cost
Annual
Energy
Savings
2 Air Tightness estimated as:
0.70 cfm/ft2 of above-grade
shell area at 75 Pascals
Perform air sealing to
reduce air leakage by
30%.
$10,000 $3,221
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
14 Add control valves to 19 Unit Heaters and add VFDs to P-1A and P-1B $20,000 $2,148
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
Ventilation
Rank Recommendation Cost Annual
Energy
Savings
11 Install new high efficiency restroom fan motor that is controlled based on
restroom occupancy and timer. Upgrade battery charging station fan to new high
efficiency unit.
$4,000 $572
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
1 Exterior Lighting 9 HPS 250 Watt Magnetic
with On/Off Photoswitch
Replace with 9 LED
115W Module
StdElectronic
$3,600 $743
3 Exterior Lighting 3 HPS 150 Watt Magnetic
with On/Off Photoswitch
Replace with 3 LED 72W
Module StdElectronic
$900 $152
4 Lightly Used
Office Spaces
10 FLUOR (4) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 10 FLUOR
(4) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$1,800 $290
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
5 Restrooms FLUOR (4) T12 4' F40T12
40W Standard StdElectronic
with Manual Switching
Replace with FLUOR (4)
T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$151 $24
6 Restrooms 2 FLUOR (4) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 2 FLUOR
(4) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$450 $70
7 Corridor 4 FLUOR (4) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 4 FLUOR
(4) T8 4' F32T8 32W
Standard Program
StdElectronic
$600 $91
8 Office Spaces 52 FLUOR (4) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 52 FLUOR
(4) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$9,600 $1,311
9 Restrooms 2 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 2 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$301 $38
10 Large Office
Spaces
28 FLUOR (4) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 28 FLUOR
(4) T8 4' F32T8 32W
Standard Program
StdElectronic
$4,200 $485
12 Warehouse 2 INCAN A Lamp, Std 25W
with Manual Switching
Replace with 2 LED 4W
Module StdElectronic
$350 $39
13 Restrooms 3 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 3 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$525 $57
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
15 Corridor 7 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 7 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$875 $91
16 Warehouse 36 FLUOR (2) T12 8'
F96T12/HO 110W Standard
Magnetic with Manual
Switching
Replace with 36 FLUOR
(4) T5 45.2" F28T5 28W
Standard StdElectronic
$9,000 $932
19 Warehouse 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 $26
20 Bay Area Work
Station
2 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 2 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$250 $21
21 Bay Area Work
Station
9 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 9 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$1,350 $96
23 Room 105 6 FLUOR (4) T12 4' F40T12
40W Standard StdElectronic
with Manual Switching
Replace with 6 FLUOR
(4) T8 4' F32T8 32W
Standard Program
StdElectronic
$900 $54
25 2nd Floor
Warehouse
28 FLUOR (2) T12 8' F96T12
75W Standard Magnetic with
Manual Switching
Replace with 28 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$3,500 $183
26 Bay Area Work
Station
INCAN A Lamp, Std 60W
with Manual Switching
Replace with FLUOR
CFL, Spiral 20 W
$50 $6
27 Restrooms FLUOR (2) T12 4' F40T12
40W Standard StdElectronic
with Manual Switching
Replace with FLUOR (2)
T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$275 $12
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
28 Lightly Used
Warehouse
8 FLUOR (2) T12 8' F96T12
75W Standard Magnetic with
Manual Switching
Replace with 8 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$1,000 $34
29 Lightly Used
Office Spaces
FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with FLUOR (2)
T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
and Improve Manual
Switching
$625 $19
30 Bay Area Work
Station
2 FLUOR T12 4' F40T12 40W
Standard Magnetic with
Manual Switching
Replace with 2 FLUOR
T8 4' F32T8 32W
Standard Program
StdElectronic
$300 $7
33 Utility/Storage 2 INCAN A Lamp, Halogen
75W with Manual Switching
Replace with 2 FLUOR
CFL, Spiral 20 W
$100 $2
35 Warehouse 81 MH 350 Watt Magnetic
with Manual Switching
Replace with 81 FLUOR
(6) T5 45.2" F54W/T5
HO Standard
StdElectronic
$40,000 $702
38 Utility/Storage FLUOR (4) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with FLUOR (4)
T8 4' F32T8 32W
Standard Program
StdElectronic
$150 $1
39 Utility/Storage FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with FLUOR (2)
T8 4' F32T8 32W
Standard Program
StdElectronic
$125 $1
41 2nd Floor
Storage/Mechanica
l
4 FLUOR (2) T12 8' F96T12
75W Standard Magnetic with
Manual Switching
Replace with 4 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$500 $2
42 Utility/Storage FLUOR (4) T12 4' F40T12
40W Standard StdElectronic
with Manual Switching
Replace with FLUOR (4)
T8 4' F32T8 32W
Standard Program
StdElectronic
$150 $0
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Refrigeration
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
Other Electrical Equipment
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
Cooking/Clothes Drying
Rank Recommended Installed
Cost
Annual
Energy
Savings
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Appendix E
Site Visit Photos
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
1. West face of building 2. South face of building
3. East face of building 4. North face of building
5. Loading bay doors 6. Unused overhead door on east face of
building.
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
7. Manually operated circular roof vents (4 total
along roof ridge)
8. Interior view of manually operated circular
roof vent
9. Boiler B-1 (Weil McLain) and B-2 (AERCO)
located in boiler room
10. Forced air furnace FAF-1 located above
kitchen and restrooms
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
11. Forced air furnace FAF-2 located above
conference rooms in mezzanine
12. Forced air furnace FAF-3 located on southern
mezzanine
13. Forced air furnace FAF-4 located in the
Science Kit area
14. The exhaust duct of the restroom exhaust fan
has become partially disconnected
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
15. Natural gas-fired hot water heater WH-1
located adjacent to FAF-1
16. Electric hot water heater WH-2 located in
Science Kit area
17. Exhaust fan for battery charging station 18. Warehousing space inside the building
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
19. Loading bays and exhaust fan EF-1
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Appendix F
Thermographic Photos
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
Coffman Engineers made miscellaneous thermographic images of ASD Warehouse building using a FLIR
T300 Infrared Camera. This is not a thermographic study, rather photographs to illustrate easy-to-identify
heat losses.
20. Optical Image, SW Corner. Thermal Image below is indicated by the white border.
21. Thermographic Image, SW Corner. Temperatures indicated by color scale on right. Yellow
indicates heat leakage. The outside temperature was about +40°F.
Heat loss at
windows is
expected.
Questionable insulation at
roof/wall connection
Questionable insulation
below window framing.
No insulation at concrete
stem wall all around
building.
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
22. Optical Image, Front Door. Thermal Image
below is indicated by the white border.
23. Optical Image, East Side. Thermal Image
below is indicated by the white border.
Thermographic image, Front Door. Rows of bolts
penetrate insulation all around building 24. Thermal Image, vacated door on east side.
25. Optical Image, North Side. Thermal Image
below is indicated by the white border.
26. Unit Heater, Thermal Image below is
indicated by the white border.
Anchorage School District Warehouse Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-05
27. Thermal Image, North Side. Yellow indicates
heat leakage.
Unit Heater is hot at all times, is not controlled
with a valve. Area above heater is warmed by
heat leakage.