HomeMy WebLinkAboutCIRI-ANC-CAEC ASD Bus Garage 2012-EE
ENERGY AUDIT FINAL REPORT
Anchorage School District Student Transportation
3580 E Tudor Rd
Anchorage, AK 99516
p (907) 343-7104
AkWarm ID No. CIRI-ANC-CAEC-01
800 F Street
Anchorage, AK 99501
p (907) 276-6664 f (907) 276-5042
Contact: Walter Heins, PE, CCP, CxA, CEA
32215 Lakefront Dr.
Soldotna, Alaska 99669
p (907) 260-5311
Contact: Jerry P. Herring, PE, CEA
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Contents
I. Executive Summary .................................................................................................................. 1
II. Introduction .............................................................................................................................. 5
III. Energy Audit Process ............................................................................................................. 6
IV. Method of Analysis ................................................................................................................. 7
V. Building Description ................................................................................................................ 8
V.I ARCHITECTURAL DESCRIPTION ............................................................................................................................ 8
V.II MECHANICAL DESCRIPTION ............................................................................................................................... 9
V.III ELECTRICAL DESCRIPTION ................................................................................................................................ 9
V.IV PORTABLE BUILDING DESCRIPTION ................................................................................................................ 10
VI. Historic Energy Consumption and Cost............................................................................. 11
VI.I ELECTRICAL CONSUMPTION DATA ................................................................................................................... 11
VI.II NATURAL GAS CONSUMPTION DATA .............................................................................................................. 11
VI.III OVERALL ENERGY CONSUMPTION DATA ....................................................................................................... 11
VII. Equipment Inventory and Photo Survey .......................................................................... 13
VIII. Energy Conservation Measures ....................................................................................... 14
VIII.I STUDENT TRANSPORTATION ECMS ............................................................................................................... 14
VIII.II PORTABLE BUILDING ECMS ......................................................................................................................... 18
VIII.III ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION ....................................... 20
Appendices
Appendix A – Energy Benchmark Data
Appendix B – AkWarm Commercial Reports
Appendix C – Major Equipment List
Appendix D – Energy Conservation Measures
Appendix E – Site Visit Photos
Appendix F – Thermographic Photos
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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 Student Transportation – Google Maps
List of Tables
1. Recommended Energy Conservation Measures Student Transportation
2. Recommended Energy Conservation Measures Portable Building
3. 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 ASD Student Transportation and
associated portable buildings 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 January 2009-December 2010 documented annual utility costs at this facility are as follows:
Electricity $ 86,170
Natural Gas $ 17,206
Total $103,375
January 2009-December 2010 Energy Utilization Index (EUI) = 328.7 kBtu/sf
January 2009-December 2010 Energy Cost Index = 7.83 $/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 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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Table 1
Recommended Energy Conservation Measures
Student Transportation
Executive Summary – Recommended Energy Conservation Measures (ECMs)
ASD Student Transportation (ST)
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
ST-0a Refrigerators Replace Refrigerators older
than 5 years old
- - - <10 years
ST-1b Boiler
Shutdown
Shutdown boiler during
summer months
$175 $0 ∞ 0
ST-2 Setback
Thermostat:
Garage and
Bus
Maintenance
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Garage and Bus
Maintenance space.
$1,600 $1,000 20.36 0.6
ST-3 Setback
Thermostat:
Offices
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Offices space.
$941 $1,000 11.97 1.1
ST-4 Other
Electrical:
Head Bolt
Outlet
Heaters
Add new Integrated Power
and Load Control Head
Bolt Outlet Receptacles
$28,157 $40,200 8.60 1.4
ST-5 Ventilation Install new high efficiency
restroom and breakroom
fan motors that are
controlled based on
occupancy and timer.
$264 $1,800 1.83 6.8
ST-6 Air
Tightening
Perform air sealing to
reduce air leakage by 20%.
$1,567 $8,000 1.76 5.1
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Executive Summary – Recommended Energy Conservation Measures (ECMs)
ASD Student Transportation (ST)
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
ST-7 Lighting:
Garage
Replace with 45 FLUOR
(4) T8 4' F32T8 32W
Standard (2) Program
StdElectronic and 22
FLUOR (3) T5 45.2"
F54W/T5 HO Standard (2)
StdElectronic
$1,569 $15,550 1.55 9.9
ST-8 Lighting:
Exterior
Replace the Exterior High
Pressure Sodium Light
Fixtures with LED Light
Fixtures
$2,768 $27,900 1.52 10.1
ST-9 Lighting:
Office and
Restrooms
Replace with 37 FLUOR
(4) T8 4' F32T8 32W
Standard (2) Program
StdElectronic, 33 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add new
Occupancy Sensors
$1,581 $17,550 1.39 11.1
ST-10 Below- (part
or all) Grade
Wall: Lower
Concrete
Wall/R-5.6
Install R-20 rigid foam
board to interior or exterior
side of wall. Does not
include cost of coverings.
$763 $13,028 1.29 17.1
Notes:
a Due to advances in refrigerators in the previous 5 years, new Energy Star refrigerators are much more efficient and
result in viable energy savings.
b ECM item was modeled with separate AkWarm model and as a result, the item is not an additive measure and is
not included in the final totals.
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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
$1,180 $1,000 14.48 0.8
PB-2 Exposed
Floor:
Portable
Building -
Floor
Install R-21 dense pack
insulation in cantilevered
floor
$221 $960 4.77 4.3
PB-3 Above-Grade
Wall:
Portable
Building -
2x4 Stud
Wall
Install R-25 rigid foam
board to exterior and cover
with T1-11 siding or
equivalent.
$1,660 $12,293 2.79 7.4
PB-4 Cathedral
Ceiling:
Portable
Building -
Cold Roof
Add R-19 dense-pack to
existing insulation.
$253 $1,943 2.69 7.7
PB-5 Exterior
Door:
Portable
Building -
Doors
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$77 $781 2.03 10.2
PB-6 Air
Tightening
Perform air sealing to
reduce air leakage by 30%.
$96 $700 1.20 7.3
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II. Introduction
This energy audit was conducted for the 13,206 square foot (sf) ASD Student Transportation building
consisting of 12,246 sf of administrative offices and a maintenance garage, and a 960 sf portable building
that is used as a training room. The energy audit was conducted in order to evaluate areas and equipment
where utility savings relative to a baseline can be realized with a reasonable project financial ratios and
payback.
Fig. 3 – Anchorage, Alaska – Google Maps
Fig. 4 – ASD Student Transportation – Google Maps
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III. Energy Audit Process
Prior to visiting the Student Transportation 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 energy conservation
measures. A spreadsheet was used to enter, sum, and calculate benchmarks and to graph energy use
information (see Appendix A). The primary benchmark calculation used for comparison and baseline data
is the Energy Utilization Index, or EUI (see Section VI).
After gathering the utility data and calculating the EUI, the next step in the audit process was to review
the architectural and engineering drawings to develop a building profile which documented building age,
type, usage, and major energy consuming equipment or systems such as lighting, Heating, Ventilating,
and Air Conditioning (HVAC), water heating, refrigeration, snow-melt, 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 September 24, 2011, and was spent inspecting the actual systems and
answering specific questions from the preliminary review. Our on-site contact during the investigation
was Mr. Jay Adams the ASD Student Transportation building manager1. Occupancy schedules, O&M
practices, building energy management program, and other information that has an impact on energy
consumption were obtained. After the site visit, the energy audit includes an evaluation of the information
gathered, researching possible conservation opportunities, organizing the audit into a comprehensive
report, and making ECM recommendations for mechanical, electrical, and building envelope
improvements.
1 Mr. Jay Adams, (907) 244-4214 (mobile), (907) 742-1213 (office)
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IV. Method of Analysis
Having completed the preliminary audit tasks noted in Section III, Coffman Engineers, Inc., (CEI)
conducted a site survey. The site survey provides critical input in deciphering where energy opportunities
exist within a facility. The audit team walked the entire site to inventory and investigate the building
envelope and major equipment, including: HVAC, water heating, lighting, and equipment located in the
garages, breakrooms, and offices. An understanding of how the equipment is used is determined during
the audit.
The collected data was entered into AkWarm Commercial™ software, an energy calculating program for
buildings. The data was processed by AkWarm to model a baseline from which ECMs could be
considered. The model was compared to actual utility costs to ensure the quality of baseline and proposed
energy modeling performed by AkWarm. The recommended ECMs focus on building envelope, HVAC,
lighting, water heating, and other electrical measures that will reduce annual energy consumption.
ECMs are evaluated based on building use and processes, local climate conditions, building construction
type, function, operational schedule, existing conditions, and foreseen future plans. When new equipment
is proposed, energy consumption is calculated based on the manufacturer’s cataloged information. Energy
savings are calculated by AkWarm.
Implementation of more than one ECM often affects the savings of other ECMs. The savings may in
some cases be relatively higher for an ECM implemented individually than when that ECM is just one of
multiple recommended ECMs. For example, implementing reduced operating schedules of inefficient
lighting systems may result in a given savings. Also implementing a more efficient lighting system will
add to the savings, but less than the efficient lighting would alone because there is less energy to be saved
when the lights are on a reduced operating schedule. Thus, if multiple ECM’s are recommended, the
combined savings are calculated and identified appropriately in groups.
In Appendix D, Energy Conservation Measures, the simple lifetime calculation is shown for each ECM,
which is based on the typical life of the equipment being replaced or altered. The energy savings are
extrapolated throughout the simple lifetime of the ECM. The total energy savings is calculated as the total
lifetime multiplied by the yearly energy savings.
The cost savings and installation costs are used to calculate simple payback2 and the Savings to
Investment Ratio3 (SIR). These are listed in Appendix D and summarized in the Executive Summary
Table of this report. The SIR is calculated as a ratio by dividing the break even cost by the initial installed
cost. Cost savings is calculated based on the historical energy costs for the building. Installation costs
include labor and equipment to evaluate the initial investment required to implement an ECM. These are
applied to each recommendation with simple paybacks calculated. The energy analyst’s opinions of
probable cost are garnered from RS Means Cost Data, other industry publications, and local contractors
and suppliers. In addition, where applicable, maintenance cost savings are estimated and applied to the net
savings.
2 The simple payback is based on the years that it takes for the net savings to payback the net installation cost (Cost
divided by Savings).
3 Savings to Investment Ratio (SIR): Break Even Cost divided by initial installed cost, where Break-Even Cost is
how much can be spent and still have the measure be cost effective; it equals the Present Value (PV) of Savings over
the life of the measure minus PV of maintenance costs.
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V. Building Description
The ASD Student Transportation facility is a single story 12,246 sf building comprised of both
maintenance garage and office space. Two portable buildings are located on the premises, however only
one is directly connected to the main electrical supply for the building. The Student Transportation
Building was constructed in 1969 and has had an entry remodel in 1976 and a roof remodel in 2010.
Another renovation took place when the school district bought longer buses, where two of the garage bays
were lengthened to accommodate the new buses. This renovation was completed prior to the roof remodel
in 2010. The office space of the building is regularly occupied by a total of eight people from 8am to 5pm
everyday from Monday to Friday with slightly extended hours during the school year. The garage space is
occupied by a total of 10 people working in one of two shifts everyday from Monday to Friday during the
school year. One shift runs from 2:30am to 11am and the other runs from 9am to 5:30pm. The garage
schedule moves to a single shift working 6am to 4:30pm from Monday to Friday during the summer.
V.I Architectural Description
Exterior walls of the building consist of a concrete block wall section below a stud wall construction. The
concrete portion is constructed of 2 core concrete blocks with 2”x2” furring strips on 16” centers and
insulated with 1-1/2” rigid insulation, on the interior side. The average height of the concrete block
portion is 7’-2” and the estimated R-value is R-5.6. There is an 18’ long section on the east side of the
building where the concrete portion of the wall is 9’ high which forms the exterior wall of the mechanical
room. The stud wall portion is constructed with 2”x4” wood studs on 16” centers insulated with R-13
fiberglass batt. This portion of the wall has siding without plywood sheathing and features a vapor barrier
on the interior face of the fiberglass insulation. The average height of the stud wall portion is 11’-11”
except around the office area where it is only 4’-4” high. The estimated R-value is R-13. There is a total
of 9,961 sf of total exterior wall area.
Floor construction for the bus garage is slab-on-grade. The perimeter of the slab has 1” thick rigid edge
insulation (R-3.6) that extends to 4 feet below grade. There is 12,246 sf of floor area.
The roof construction of the building is an EPDM roofing membrane covering rigid insulation on top of a
vapor barrier on plywood decking. According to the roof remodel architectural drawings, the rigid
insulation of the roof is a two layer rigid insulation with an average R-value of R-32. A small section of
the roof over the office space features tapered two-layer, rigid insulation with an average R-value of R-30.
The approximate roof area with tapered insulation is 590 sf. The 2010 roof remodel included structural
upgrades to the roof over the office space to handle snow drift loads with structural overframing. This
overframing features two-layer, rigid insulation with an approximate R-value of R-38.5 with an
approximate area of 606 sf.
There are 10 south facing windows in the building and 15 windows on the west and north sides of the
building for a total of 25 windows. The windows are wood-framed, two pane, glass windows with a 0.25”
air filled pane space. The wood frames around the windows on all sides of the building were observed to
have large air leakages and did not appear to seal well. The South facing window area is 141 sf and
windows facing all other directions total 212 sf.
The building has several different types of exterior man doors and overhead garage doors. The man door
located on the South face of the building is an older style insulated metal door estimated at R-1.8. The
man door located on the East face of the building is a metal double door with a vent on one side. It is
estimated to have foam insulation and provides access to the mechanical room. There is an insulated
metal man door and an insulated metal entry door with a half light window located on the West face of
the building. The nine overhead garage doors located on the East face of the building appear to be new
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and well maintained. Several of these doors have half light windows, man doors, and/or exhaust holes.
There are two overhead garage doors located on the West face of the building that also appear to be new
and well maintained.
V.II Mechanical Description
The building is heated with a dual fuel gas-oil boiler and three gas fired unit heaters. The dual fuel Weil-
McLain boiler delivers heat to perimeter hydronic baseboards and five small unit heaters. The boiler is a
series 888 with 1,082,000 BTU/hr input rating. It typically runs on natural gas, but also has an onsite
heating oil storage with a 25 gallon day tank in order to utilize heating oil during an emergency. The
boiler is controlled with a Honeywell 7800 series boiler control and was installed in 2006 as part of an
emergency preparedness project. Currently, the boiler operates all year long.
No mechanical cooling is provided for any equipment in the building. There is an air handling unit in the
office space that is un-used because it creates a draft effect for the employees. Mechanical ventilation for
the office space is provided by an exhaust fan servicing the break room and another servicing the
restrooms. The break room exhaust fan is estimated to be powered by a 1/12 horsepower motor moving
100 CFM of air. The restroom exhaust fan is a Neptune model RF-40 and is powered by a 1/12
horsepower motor moving 400 CFM of air. Both exhaust fan motors are estimated to be 60% efficient
and operate constantly during occupancy schedules. Office windows may be opened to provide additional
ventilation and temperature control per employee preference. Mechanical ventilation for the garage area is
provided by an exhaust fan servicing the welding room and another servicing the bus washing area. The
welding room exhaust fan is a Loren Cook model 14CV17D powered by a 1 horsepower motor moving
1700 CFM of air. It operates approximately 3 hours/week. The washing area exhaust fan is powered by a
1.5 horsepower motor moving 3200 CFM of air. It operates approximately 2 hours/week. Both exhaust
fan motors are estimated to be 60% efficient. There are several garage doors located in the garage space
that are operated as part of routine business. These provide additional ventilation to the space.
Building hot water is provided by a gas-fired, standard updraft hot water heater with a standing pilot light.
It is an A.O. Smith model BTR400A10 and is approximately 8 years old. The hot water heater has a
399,000 BTU/hr input rating with a 100 gallon capacity tank.
The building energy management and control system utilizes a pneumatic compressor and control lines to
operate the baseboard heating in the office space. Pneumatic systems are considered archaic due to the
vast improvements in monitoring, control and operating efficiencies available from the modern genre of
electronic control systems. A Siemens Apogee Direct Digital Control (DDC) system controls the boiler
and its associated pumps as well as the hydronic unit heaters. It uses outdoor air temperature as a reset for
the boiler.
V.III Electrical Description
The Student Transportation building is served by 120/208 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.
Lighting in the office spaces, corridors, and restrooms is provided by manually controlled light fixtures
comprised of two fluorescent 4’ long T12 lamps with magnetic ballasts. Several of the fluorescent light
fixtures used to light the offices are wired as night lights and are always on. In the garage area, lighting is
provided by a mixture of manually controlled high bay and 4' fluorescent T12 wrap around light fixtures.
The high bay light fixtures consist of metal halide and 8' fluorescent high output T12 light fixtures.
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Exterior lighting consists of 150W and 750W pole mounted high pressure sodium (HPS) light fixtures
illuminating the parking areas, 100W HPS canopy lights illuminating the bus ports, HPS wall packs
lighting the areas adjacent to the building, and a 150W HPS canopy light illuminating the entrance to the
portable building. The exterior light fixtures are controlled by a photo switch turning the lights off during
the day.
The other significant electrical load for this facility is the receptacles in the outdoor bus parking area.
There are approximately 134 parking stalls. Each stall has a duplex receptacle that serves the trickle
charger and block heaters for the school buses and other fleet vehicles. There are no controls in place to
limit the power usage of these loads.
V.IV Portable Building Description
There are two portable buildings located adjacent to Student Transportation. Power for one of the
portables is drawn from the main electric breaker at the building. The other portable is independently
connected to the power grid. The portable is constructed of 2x4 wood stud wall 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. The portable has 1,280 sq ft of exterior wall area.
The portable has an above grade floor 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-13 fiberglass batt insulation. The portable has 960 sq ft of floor area.
The portable is covered by a cold roof, with shingles covering plywood decking. It is estimated that the
roof insulation is R-13 fiberglass batt insulation. The portable has approximately 1,012 sq ft of roof area.
There are four single glass pane, wood framed windows on the portable with an estimated R-value of R-
1.1. There are two insulated metal doors with an estimated R-value of R-1.7.
The portable is heated with 11 electric resistance perimeter baseboards rated at 2,000W each. 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 Anchorage School
District states its desire to keep all portable buildings on electric heat and not utilize natural gas heating at
this time.
The lighting in the portable is 2 lamp, 4ft long, T-12 light fixtures with magnetic ballasts. Due to the low
operational use of the portable 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.
Due to the fact that only one on-site portable is connected to the main electrical breaker at the
Student Transportation building, only one AkWarm model was created to model this portable
building.
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VI. Historic Energy Consumption and Cost
Tables provided in Appendix A, Energy Benchmark Data Report, represent the electric and natural gas
energy usage for the surveyed facility from January 2009 to December 2010. Chugach Electric provides
the electricity and Enstar Natural Gas provides the natural gas to the building. Both 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 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.
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 in 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.
Table 3
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 $1.03 /CCF $0.96 /CCF $1.00 /CCF
Total Cost $115,865 $90,885 $103,095.24
ECI $8.77 /sf $6.88 /sf $7.83 /sf
Electric EUI 204.1 kBtu/sf 192.3 kBtu/sf 198.2 kBtu/sf
Natural Gas EUI 133.7 kBtu/sf 127.2 kBtu/sf 130.5 kBtu/sf
Building EUI 337.8 kBtu/sf 319.5 kBtu/sf 328.7 kBtu/sf
The Energy Cost Index (ECI) is derived by dividing the annual cost by the building square footage. The
building square footage was calculated to be approximately 13,206 square feet. This area includes the
12,246 sf ASD Student Transportation building and the 960 sf portable building.
The annual EUI is expressed in Thousands of British Thermal Units per Square Foot (kBtu/sf) and can be
used to compare energy consumption of similar building types or to track consumption from year to year
in the same building. The EUI is calculated by converting annual consumption of all fuels used to Btu’s
and then dividing by the area (gross conditioned square footage) of the building. EUI is a good indicator
of the relative potential for energy savings. A comparatively low EUI indicates less potential for large
energy savings. Building architectural, mechanical, and electrical drawings were obtained and utilized to
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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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VII. Equipment Inventory and Photo Survey
Following the completion of the field survey a detailed equipment list was created and is attached as
Appendix C. The major equipment listed are considered to be the major energy consuming equipment in
the building whose replacement could yield substantial energy savings.
An approximate age was assigned to the equipment if a manufactured date was not shown on the
equipment’s nameplate. As listed in the 2011 ASHRAE Handbook for HVAC Applications, Chapter 37,
Table 4, the service life for the equipment along with the remaining useful life in accordance to the
ASHRAE standard are also noted in the equipment list.
Where there are zero (0) years remaining in the estimated useful life of a piece of equipment, this is an
indication that maintenance costs are likely on the rise and more efficient replacement equipment is
available which will lower the operating costs of the unit. Maintenance costs should also fall with the
replacement.
Additionally, photos of various equipment and the building construction were taken during the site visit.
Several photos are included in Appendix E.
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VIII. Energy Conservation Measures
The following ECMs described here have been calculated by AkWarm Commercial and considered by the
energy audit team as viable projects. ECMs provided below are considered to have viable financial ratios
(SIR>1) or to add value to the building or building operational profiles. For a full list of ECMs considered
and calculated by the energy audit team, including ECMs not recommended at this time, please see
Appendix D.
VIII.I Student Transportation ECMs
ECM# ST-0 – Replace residential & light commercial refrigerators/freezers older than 5 years old
Annual Energy Savings Installed Cost SIR Payback (years)
---<10 years
Due to advances in refrigerators in the previous five years, new Energy Star residential-type and light
commercial-type refrigerators and freezers are much more efficient and result in viable energy savings.
Built-in refrigerators and freezers should be evaluated independently. Replacing existing refrigerators,
which are older than five years old, with new energy star models will typically have paybacks of less than
10 years.
ECM # ST-1– Shutdown Boiler during Summer Months
Annual Energy Savings Installed Cost SIR Payback (years)
$175 $0 ∞0
The dual fuel, gas-oil, boiler in the building operates year-round, even during the summer when limited
heating needs are required. By turning off the boiler 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
Student Transportation building does not contain grooved-joint couplings, leaks should not be an issue
when the boiler is shut down seasonally. The saving-to-investment ratio is infinite and payback is zero, as
no capital cost is required.
ECM # ST-2 – Set back Thermostat: Garage Space
Annual Energy Savings Installed Cost SIR Payback (years)
$1,600 $1,000 20.36 0.6
Significant energy savings exist by reducing the room temperature of the garage space during unoccupied
times. Reducing the temperature of the garage space to 60F during unoccupied times will save
approximately $1,600 annually, with an estimated installed cost of $1,000. Additional annual energy
savings could be achieved by further reducing the temperature of the garage space to 50F during
unoccupied times. See item ST-1 in appendix D for more information.
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ECM# ST-3 – Set back Thermostat: Office Space
Annual Energy Savings Installed Cost SIR Payback (years)
$941 $1,000 11.97 1.1
Significant energy savings exist by reducing the room temperature of the office space during unoccupied
times. Reducing the temperature of the office space to 60F during unoccupied times will save
approximately $941 annually, with an estimated installed cost of $1,000. Additional annual energy
savings could be achieved by further reducing the temperature of the office space to 50F during
unoccupied times. See item ST-2 in appendix D for more information.
ECM# ST-4 – Install Integrated Power and Load Control Head Bolt Outlet Receptacles
Annual Energy Savings Installed Cost SIR Payback (years)
$28,157 $40,200 8.60 1.4
There are approximately 134 outdoor parking stalls. Each stall has a duplex receptacle that serves the
trickle charger and block heaters for school buses and other fleet vehicles. Currently, there are no controls
in place to limit the power usage of these loads, so the head bolt outlet heater operates the entire time that
the vehicle is plugged in. This load a large percentage of the facility's total electrical usage. Integrated
power and load control (IPLC) outlet receptacles may be installed in addition to the existing receptacles to
provide timer and thermostat control of the head bolt heaters. The existing receptacles will remain to
provide power for the trickle chargers that the busses use to maintain the charge on their batteries. These
receptacles can switch on and off throughout the entire duration that a vehicle is plugged in with a
frequency based on outside temperature; turning off once the temperature exceeds 40 degrees F and varies
on-time from 10% at 40degrees F to 100% at -4 degrees F. Though the settings are adjustable, the listed
default settings have been optimized for diesel fleet vehicles in Canada. Additionally, this ECM is
scalable and may be implemented in a few stalls at a time as funds become available. See item ST-3 in
appendix D for more information.
ECM # ST-5– Upgrade Exhaust Fans for Restrooms and Break room
Annual Energy Savings Installed Cost SIR Payback (years)
$264 $1,800 1.83 6.8
Significant savings exist by upgrading the fan motors and controlling the run time of the restroom and
break room fans. Currently, the existing fans operate continuously. Replacing the old fan motors with
new, high-efficiency, motors will save electricity consumption. Also, adding occupancy and timer control
to these exhaust fans will allow them to shut off during times when they are 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. See item ST-8 in appendix D for more information.
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ECM# ST-6 - Air Tightening
Annual Energy Savings Installed Cost SIR Payback (years)
$1,567 $8,000 1.76 5.1
Air infiltration into Student Transportation can be reduced by tightening the building envelope with air
sealing improvements. This in turn will reduce the heating load required by the building and reduce the
amount of natural gas being burned by the boilers. While a blower door test was not completed, it is
anticipated that air leakage is occurring through old weather stripping around doors, window frames, and
wall and roof penetrations. Methods to decrease the infiltration into the building include: sealing around
the windows and doors with caulking and insulation, adding new weather stripping to doors, providing
gaskets to all exterior cover plates and sealing all roof and wall penetrations. See item ST-9 in appendix D
for more information.
ECM # ST-7 – Upgrade the Lighting Systems in the Garage Spaces
Annual Energy Savings Installed Cost SIR Payback (years)
$1,569 $15,550 1.55 9.9
Upgrading the lighting in the warehouse would include replacing the 4’ wrap around fluorescent T12 light
fixtures with T8 light fixtures. Additionally the metal halide and T12 fluorescent high bay light fixtures
may be replaced with fluorescent T5HO high bay light fixtures.
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 ST-6, ST-10, ST-11, ST-14, ST-25, and ST-36 in
appendix D for details of individual measures.
ECM # ST-8 – Upgrade Exterior Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$2,768 $27,900 1.52 10.1
Pole mounted HPS light fixtures are used to light the parking areas around the ASD Bus Garage building,
wall pack and canopy light fixtures are used to light the building entrances and adjacent areas, and the bus
ports are lit by small canopy HPS lights. These existing HPS light fixtures may be replaced with LED
fixtures that would provide significant energy savings and may also increase the safety of the parking area
because of better color rendering qualities offered by LED sources.
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 ST-4, ST-5, ST-12, ST-16, ST-23, ST-26, and ST-
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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ECM # ST-9 – Upgrade the Office and Restroom Lighting and Control Systems
Annual Energy Savings Installed Cost SIR Payback (years)
$1,581 $17,550 1.39 11.1
Upgrading the lighting in the restrooms, office spaces, and corridors includes replacing and retrofitting
approximately 109 4' fluorescent T12 light fixtures with T8 light fixtures equipped with program start
electronic ballasts. Approximately 12 occupancy sensors could be used to control approximately 79
fixtures in the smaller offices and conference areas for additional savings. The remaining 30 fixtures
would be controlled with the existing manual switches because they illuminate common use areas that
would be difficult to control with 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 ST-7, ST-13, ST-18, and ST-20 in appendix D for
details of individual measures.
ECM # ST-10 – Install R-20 Insulation to Concrete Portion of Exterior Walls
Annual Energy Savings Installed Cost SIR Payback (years)
$763 $13,028 1.29 17.1
Due to the Concrete block construction and poor insulation of the lower portion of the exterior walls, the
current effective insulation value is R-5.6. It is recommended that an additional layer of R-20 rigid foam
insulation be added to the concrete portion of all exterior walls. This type of rigid insulation can be added
to either the interior or exterior side of the wall, however since furring strips already exist on the interior
face it is recommended that the insulation be attached to there. Significant savings can be achieved by
increasing the insulation value of the lower portion of the walls of the building envelope.
This description is 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 insulation configurations
were modeled separately. See measures ST-15 and ST-17 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 Portable Building ECMs
ECM #PB-1 – Setback Thermostat
Annual Energy Savings Installed Cost SIR Payback (years)
$1,180 $1,000 14.48 0.8
Significant energy savings exist by reducing the room temperature of the portable building during
unoccupied times. However, due to the fact that the portable building has eleven perimeter electric
baseboard heaters, each with individual dial thermostats, it is difficult to obtain a desired set point in the
portable building. As a result, the temperature in the portable is typically much higher than required, 65F
or warmer. Also, the temperature cannot be set back during unoccupied times. It is recommended that a
central programmable thermostat be installed in the portable building that can turn the perimeter electric
baseboards on or off to control occupied and unoccupied temperature set points. Reducing the portable
temperature from 65F to 60F during unoccupied times will save $1,180 annually in electricity bills. See
item PB-1 in Appendix D for more information.
ECM #PB-2 – Add Insulation to Portable Floor
Annual Energy Savings Installed Cost SIR Payback (years)
$221 $960 4.77 4.3
The Portable has an above grade floor resting on sleepers which are protected from the weather by
plywood skirting. The floor is estimated to have R-13 fiberglass batt insulation. Installing additional
insulation to the floor of the portable will reduce heat loss and reduce electricity consumption. It is
recommended to install dense pack insulation with an approximate R-value of R-21 in the cantilevered
floor of the portable. See item PB-2 in Appendix D for more information.
ECM #PB-3 – Increase Insulation in Portable Exterior Wall
Annual Energy Savings Installed Cost SIR Payback (years)
$1,660 $12,293 2.79 7.4
Significant energy savings exist by increasing the R-value of the exterior portable walls. The portable is
constructed of 2x4 wood stud wall 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. Installing
rigid foam board insulation to the exterior face with an approximate R-value of R-25 and covering the
insulation with T1-11 siding will save $1,660 per year. See item PB-3 in Appendix D for more
information.
ECM #PB-4 – Add Roof Insulation
Annual Energy Savings Installed Cost SIR Payback (years)
$253 $1,943 2.69 7.7
Adding additional R-19 fiberglass batt insulation to the roof of the portable to make an R-38 roof may be
feasible during the next scheduled roof replacement. Installing an additional layer of R-19 insulation will
save approximately $253 per year, with an installed cost of $1,943 if completed in combination with the
roof replacement. See item PB-4 in Appendix D for more information.
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ECM #PB-5 – Replace Exterior Doors
Annual Energy Savings Installed Cost SIR Payback (years)
$77 $781 2.03 10.2
The portable building has two poorly insulated (R-1.7) metal doors. It is recommended that both doors be
removed and replaced with new R-6.25 minimum (U-0.16) insulated doors. The new doors should have
proper weather stripping on them to reduce air infiltration. See item PB-5 in Appendix D for more
information.
ECM #PB-6– Seal Building Envelope and Reduce Infiltration by 30%
Annual Energy Savings Installed Cost SIR Payback (years)
$96 $700 1.20 7.3
By tightening the portable building envelope with air sealing improvements, infiltration into the portable
will be reduced. This in turn will reduce the heating load and reduce the amount of electricity being used
by the electric heaters. While a blower door test was not completed, it is anticipated that air leakage is
occurring around old weather stripping around doors, window frames, and wall and roof penetrations.
Methods to decrease the infiltration into the portable include: sealing around the windows and doors with
caulking and insulation, adding new weather stripping to doors, providing gaskets to all exterior cover
plates and sealing all roof and wall penetrations. See item PB-6 in Appendix D for more information.
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VIII.III Administrative Controls for Energy Conservation and Optimization
While the intent of many energy conservation measures is to increase the efficiency of fuel-burning and
electrical equipment, an important factor of energy consumption lies in the operational profiles which
control the equipment usage. Such profiles can be managed by administrative controls and departmental
leadership. They determine how and when fuel-burning and electrical equipment are used, and therefore
have a greater impact on energy savings potential than simply equipment upgrades alone. Significant
energy cost savings can be realized when ECMs are combined with efficient-minded operational profiles.
Operational profiles may be outlined by organization policy or developed naturally or historically. These
profiles include, but are not limited to: operating schedules, equipment setpoints and control strategies,
maintenance schedules, and site and equipment selection.
Optimization of operational profiles can be accomplished by numerous methods so long as the intent is
reduction in energy-using equipment runtime. Due to the numerous methods of optimization, energy cost
savings solely as a result of operational optimization are difficult to predict. Quantification, however, is
easy to accomplish by metering energy usage during and/or after implementation of energy-saving
operational profiles and ECMs. Shown below are some examples which have proven successful for other
organizations.
Optimization of site selection includes scheduling and location of events. If several buildings in a given
neighborhood are all lightly used after regularly occupied hours, energy savings can be found when after-
hours events are consolidated and held within the most energy efficient buildings available for use. As a
result, unoccupied buildings could be shut down to the greatest extent possible to reduce energy
consumption.
Two operational behaviors which can be combined with equipment upgrades are operating schedules and
equipment control strategies including setpoints. Occupancy and daylight sensors can be programmed to
automatically shut off or dim lighting when rooms are unoccupied or sufficiently lit from the sun.
Operating schedules can be optimized to run equipment only during regular or high-occupancy periods.
Also, through a central control system, or with digital programmable thermostats, temperature setpoints
can be reduced during low-occupancy hours to maximize savings. In addition, sporadically used
equipment can be shut down during unoccupied hours to further save energy. In general, having
equipment operating in areas where no occupants are present is inefficient, and presents an opportunity
for energy savings.
Operational profiles can also be implemented to take advantage of no- or low-cost ECMs. Examples
include heating plant optimizations (boiler section cleaning, boiler flush-through cleaning) and tighter
controls of equipment setbacks and shutdowns (unoccupied zones equipment shutdown, easier access to
and finer control of equipment for after-hours control). In a large facility management program,
implementation of these measures across many or all sites will realize dramatic savings due to the
quantity of equipment involved.
Changes to building operational profiles can only be realized while simultaneously addressing health,
safety, user comfort, and user requirements first. It is impractical to expect users to occupy a building or
implement operational behaviors which do not meet such considerations. That said, it is quite practical for
management groups to implement administrative controls which reduce losses brought about by excess
and sub-optimum usage.
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Appendix A
Energy Benchmark Data
First Name Last Name Middle Name Phone
Tawny Klebesadel
m
343‐7104
State Zip
AK
Monday‐
Friday
Saturday Sunday Holidays
09:00‐05:00
Average # of
Occupants
During
Renovations
Date
ASD Transportation Center Other
REAL Preliminary Benchmark Data Form
PART I – FACILITY INFORMATION
Facility Owner
MOA
Building Name/ Identifier Building Usage Building Square Footage
Date
Municipal Government/Subdivision
13,206
Year Built
Facility Address
Building Type
City
Facility Owned By
03/14/11
1 Gas Meter
Elec Service 2 - ASD Transport Building - No Demand Charges
Mixed
Community Population
Facility City
1979
Facility Zip
kLEBESADELtm@CI.ANCHORAGE.AK.US
3580 E Tudor Rd Anchorage
Elec Service 1 - ASD Bus Barn - Demand Charges
261,500
99516
Email
Anchorage
Details
Mailing Address
Primary
Operating
Hours
Contact Person
PART II – ENERGY SOURCES
Heating Oil Electricity Natural Gas Propane Wood Coal
$ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton
Other energy
sources?
Bus Garage = 12,245 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.
Relo 1 = 960 SF
2. Provide utilities bills for the most recent two‐year period for each energy source you use.
Relo 2 = 1872. Not connected to ASD Bus Barn electrical breaker, therefore not included in
total area.
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ASD Transportation Center
Buiding Size Input (sf) =13,206
2009 Natural Gas Consumption (Therms)17,656.00
2009 Natural Gas Cost ($)18,249
2009 Electric Consumption (kWh)789,744
2009 Electric Cost ($)97,616
2009 Total Energy Use (kBtu)4,460,996
2009 Total Energy Cost ($)115,865
Annual Energy Use Intensity (EUI)
2009 Natural Gas (kBtu/sf) 133.7
2009 Electricity (kBtu/sf)204.1
2009 Energy Utilization Index (kBtu/sf)337.8
Annual Energy Cost Index (ECI)
2009 Natural Gas Cost Index ($/sf)1.38
2009 Electric Cost Index ($/sf)7.39
2009 Energy Cost Index ($/sf)8.77
2010 Natural Gas Consumption (Therms)16,800.00
2010 Natural Gas Cost ($)16,162
2010 Electric Consumption (kWh)744,125
2010 Electric Cost ($)74,723
2010 Total Energy Use (kBtu)4,219,699
2010 Total Energy Cost ($)90,885
Annual Energy Use Intensity (EUI)
2010 Natural Gas (kBtu/sf)127.2
2010 Electricity (kBtu/sf)192.3
2010 Energy Utilization Index (kBtu/sf)319.5
Annual Energy Cost Index (ECI)
2010 Natural Gas Cost Index ($/sf)1.22
2010 Electric Cost Index ($/sf)5.66
20010 Energy Cost Index ($/sf)6.88
Note:
1 kWh = 3,413 Btu's
1 Therm = 100,000 Btu's
1 CF ≈ 1,000 Btu's
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ASD Transportation CenterNatural 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 NGC270 Jan‐09 01/14/09 02/16/093329112,911$2,978$1.02Enstar NGC270 Feb‐09 02/16/09 03/16/092822232,223$2,286$1.03Enstar NGC270 Mar‐09 03/16/09 04/17/093222192,219$2,291$1.03Enstar NGC270 Apr‐09 04/17/09 05/15/092816081,608$1,676$1.04Enstar NGC270 May‐09 05/15/09 06/17/0933794794$861$1.08Enstar NGC270 Jun‐09 06/17/09 07/17/0930374374$436$1.17Enstar NGC270 Jul‐09 07/17/09 08/18/0932294294$360$1.22Enstar NGC270 Aug‐09 08/18/09 09/16/0929495495$561$1.13Enstar NGC270 Sep‐09 09/16/09 10/14/0928903903$974$1.08Enstar NGC270 Oct‐09 10/14/09 11/13/093013871,387$1,460$1.05Enstar NGC270 Nov‐09 11/13/09 12/14/093120462,046$2,116$1.03Enstar NGC270 Dec‐09 12/14/09 01/15/103224022,402$2,250$0.94Enstar NGC270 Jan‐10 01/15/10 02/12/102823512,351$2,012$0.86Enstar NGC270 Feb‐10 02/12/10 03/15/103119781,978$1,697$0.86Enstar NGC270 Mar‐10 03/15/10 04/16/103218001,800$1,560$0.87Enstar NGC270 Apr‐10 04/16/10 05/13/102714141,414$1,250$0.88Enstar NGC270 May‐10 05/13/10 06/15/1033987987$894$0.91$$Enstar NGC270 Jun‐10 06/15/10 07/14/10 29 583 583$552$0.95Enstar NGC270 Jul‐10 07/14/10 08/17/10 34 466 466 $594 $1.27Enstar NGC270 Aug‐10 08/17/10 09/16/10 30 496 496 $746 $1.50Enstar NGC270 Sep‐10 09/16/10 10/15/10 29 834 834 $1,034 $1.24Enstar NGC270 Oct‐10 10/15/10 11/12/10 28 1342 1,342 $1,467 $1.09Enstar NGC270 Nov‐10 11/12/10 12/13/10 31 1930 1,930 $1,908 $0.99Enstar NGC270 Dec‐10 12/13/10 01/18/11 36 2619 2,619 $2,448 $0.93Jan ‐ 09 to Dec ‐ 09 total:17,65617,6560.00$18,249$0Jan ‐ 10 to Dec ‐ 10 total:16,80016,8000.00$16,162$0$1.03$0.96Jan ‐ 09 to Dec ‐ 09 avg:Jan ‐ 10 to Dec ‐ 10 avg:ASD Student Transportation Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
$1,500 $2,000 $2,500 $3,000 $3,500 1,5002,0002,5003,0003,500Natural Gas Cost ($)Natural Gas Consumption (Therms)ASD Bus Garage ‐Natural Gas Consumption (Therms) vs. Natural Gas Cost ($)Natural Gas Consumption (Therms)Natural Gas Cost ($)$0 $500 $1,000 05001,000Jan‐09 Mar‐09 May‐09 Jul‐09 Sep‐09 Nov‐09 Jan‐10 Mar‐10 May‐10 Jul‐10 Sep‐10 Nov‐10NDate (Mon ‐Yr)ASD Student Transportation Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
ASD Transportation CenterElectricityBtus/kWh =3,413Provider Customer #Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)CEAJan‐09929173,171151.00 $13,058$0.14CEAFeb‐09803262,742151.00 $11,195$0.14CEAMar‐09863372,947148.00 $11,614$0.13CEAApr‐09746602,548148.00 $9,976$0.13CEAMay‐09501941,713146.00 $7,111$0.14CEAJun‐0928397969128.00 $3,708$0.13CEAJul‐092520786055.00 $3,071$0.12CEAAug‐09326301,11481.00 $4,014$0.12CEASep‐09512821,750139.00 $5,981$0.12CEAOct‐09786022,683144.00 $8,586$0.11CEANov‐09898573,067160.00 $9,621$0.11CEADec‐09993353,390160.00 $9,681$0.10CEAJan‐10974193,325162.00 $9,352$0.10CEAFeb‐10831562,838162.00 $7,953$0.10CEAMar‐10889353,035154.00 $8,906$0.10CEAApr‐10741242,530152.00 $7,595$0.10CEAMay‐10545981,863137.00 $6,002$0.11CEAJun‐1028233964128 00$3 106$0 11CEAJun1028233964128.00 $3,106$0.11CEAJul‐102266977452.00 $2,387$0.11CEAAug‐102711992668.00 $2,891$0.11CEASep‐10346651,18382.00 $3,648$0.11CEAOct‐10583421,991139.00 $5,928$0.10CEANov‐10806152,751154.00 $7,884$0.10CEADec‐10942503,217154.00 $9,071$0.10Jan ‐ 09 to Dec ‐ 09 total:78974426,9541611.00$97,616Jan ‐ 10 to Dec ‐ 10 total:74412525,3971544.00$74,723$0.12$0.10Jan ‐ 09 to Dec ‐ 09 avg:Jan ‐ 10 to Dec ‐ 10 avg:ASD Student Transportation Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
$6,000 $8,000 $10,000 $12,000 $14,000 400006000080000100000120000Electric Cost ($)Electric Consumption (kWh)ASD Bus Garage ‐Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)$0 $2,000 $4,000 020000Jan‐09 Mar‐09 May‐09 Jul‐09 Sep‐09 Nov‐09 Jan‐10 Mar‐10 May‐10 Jul‐10 Sep‐10 Nov‐10Date (Mon ‐Yr)ASD Student Transportation Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
Appendix B
AkWarm Commercial Reports
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 12/05/2011
11:01AM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Anchorage School District Bus Garage Auditor Company: Coffman Engineers, Inc.
Address: 3580 E Tudor Rd Auditor Name: Walter Heins, PE, CCP, CxA, CEA
City: Anchorage Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Tawny Klebesadel
Client Address: Anchorage, AK Auditor Phone: (907) 276-6664
Auditor FAX: (907) 276-5042
Client Phone: (907) 343-7104 Auditor Comment:
Client FAX:
Design Data
Building Area: 12,246 square feet Design Heating Load: Design Loss at Space: 623,692
Btu/hour
with Distribution Losses: 623,692 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency
and 25% Safety Margin: 950,749 Btu/hour
Note: Additional Capacity should be added for DHW
load, if served.
Typical Occupancy: 18 people Design Indoor Temperature: 68.6 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: $0.110/kWh Average Annual Cost/ccf: $1.000/ccf
ASD Student Transportation Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01 Annual Energy Cost Estimate Description Space Heating Space Cooling Water Heating Lighting Other Electrical Cooking Clothes Drying Vent Fans Service Fees Total Cost Existing Building $18,788 $0 $963 $17,486 $68,913 $0 $0 $234 $0 $106,384 With Proposed Retrofits $12,728 $0 $963 $10,539 $40,756 $0 $0 $85 $0 $65,072 SAVINGS $6,060 $0 $0 $6,946 $28,157 $0 $0 $149 $0 $41,312
ASD Student Transportation Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
ASD Student Transportation Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
ASD Student Transportation Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
Appendix C
Major Equipment List
ASD Student Transportation Final Energy Audit Report Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) B‐1 MECH RM BUILDING HEATING WEIL‐MCLAIN 888 CAST IRON DUAL‐FUEL 1082 MBH ≈ 65% 30 25 P‐1A MECH RM HEATING WATER CIRC ARMSTRONG 4300 IMPELLER 120GPM 50’ ≈ 86.5% 3 10 5 P‐1B MECH RM HEATING WATER CIRC ARMSTRONG 4300 IMPELLER 120GPM 50’ ≈ 86.5% 3 10 5 EF‐1 RESTROOM TOILET EXHAUST NEPTUNE RF‐40 400 CFM ≈ 60% 1/12 25 1 EF‐ BREAK ROOM BREAK ROOM EXHAUST 400 CFM ≈ 60% 1/12 25 1 EF‐4 WELDING ROOM WELDING EXHAUST LOREN COOK 14CV17D 1700 CFM ≈ 60% 1 25 1 EF‐5 WASH AREA WASH AREA EXHAUST 3200 3200 CFM ≈ 60% 1.5 25 1
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
Appendix D
Energy Conservation Measures
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
The following tables consist of raw output data from the AkWarm Commercial program used to model
energy costs and calculate energy savings and financial ratios. These tables represent all of the energy
conservation measures calculated and considered by the energy audit team. However, ECMs included in
the Executive Summary and Section VIII are recommended by the energy audit team due to their viable
financial ratios (SIR>1) or due to their value added.
PRIORITY LIST – BUS GARAGE - RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
ST-0a Refrigerators Replace Refrigerators older
than 5 years old
- - - <10 years
ST-00c Boiler Shutdown Shutdown boiler during
summer months
$175 $0 ∞0
ST-1 Setback
Thermostat: Garage
and Bus
Maintenance
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for the
Garage and Bus
Maintenance space.
$1,600 $1,000 20.36 0.6
ST-2 Setback
Thermostat:
Offices
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for the
Offices space.
$941 $1,000 11.97 1.1
ST-3 Other Electrical:
Head Bolt Outlet
Heaters
Add new Clock Timer or
Other Scheduling Control
$28,157 $40,200 8.60 1.4
ST-4 Lighting: Exterior Replace with 2 LED 17W
Module StdElectronic
$76 $125 5.31 1.6
ST-5 Lighting: Exterior Replace with 8 LED 115W
Module StdElectronic
$605 $2,400 3.88 4
ST-6 Lighting: Garage Replace with 7 FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
$211 $1,050 3.09 5
ST-7 b Lighting: Large
Office
Replace with 20 FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
$472 $3,000 2.42 6.4
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
PRIORITY LIST – BUS GARAGE - RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
ST-8 Ventilation Install new high efficiency
restroom and breakroom fan
motors that are controlled
based on occupancy and
timer.
$264 $1,800 1.83 6.8
ST-9 Air Tightening Perform air sealing to reduce
air leakage by 20%.
$1,567 $8,000 1.76 5.1
ST-10 Lighting: Garage Replace with 3 FLUOR (3)
T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
$126 $1,200 1.62 9.5
ST-11 Lighting: Garage Replace with 38 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$572 $5,700 1.54 10
ST-12 Lighting: Exterior Replace with LED 72W
Module StdElectronic
$46 $500 1.43 10.8
ST-13 b Lighting: Small
Volume Office
Replace with 21 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$346 $3,750 1.42 10.8
ST-14 Lighting: Garage Replace with 19 FLUOR (6)
T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
$660 $7,600 1.34 11.5
ST-15 Below- (part or all)
Grade Wall: East
Mech
Room/Concrete/R-
5.6
Install R-20 rigid foam
board to interior or exterior
side of wall. Does not
include cost of coverings.
$45 $753 1.31 16.9
ST-16 Lighting: Exterior Replace with 10 LED 4W
Module StdElectronic
$2,117 $25,000 1.30 11.8
ST-17 Below- (part or all)
Grade Wall: Lower
Concrete Wall/R-
5.6
Install R-20 rigid foam
board to interior or exterior
side of wall. Does not
include cost of coverings.
$718 $12,275 1.29 17.1
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
PRIORITY LIST – BUS GARAGE - RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
ST-18 b Lighting: Large
Office
Replace with 6 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$71 $900 1.21 12.7
ST-19 b Lighting: Restroom Replace with 8 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic and
Add new Occupancy Sensor
$132 $1,800 1.13 13.7
ST-20 b Lighting: Small
Volume Office
Replace with 17 FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor
$560 $8,100 1.06 14.5
ST-21 Exterior Door:
South Face
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$16 $410 0.87 25.5
ST-22 HVAC And DHW Install control valves to
reduce flow to hydronic unit
heaters based on thermostat
set point
$154 $3,000 0.83 19.5
ST-23 Lighting: Exterior Replace with 21 LED 50W
Module StdElectronic
$675 $12,600 0.82 18.7
ST-24 Exterior Door:
West Face - Entry
Door
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$12 $410 0.66 33.4
ST-25 Lighting: Garage Replace with 6 FLUOR (3)
T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
$100 $2,400 0.64 24.1
ST-26 Lighting: Exterior Replace with 2 LED 72W
Module StdElectronic
$40 $1,000 0.62 25
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
PRIORITY LIST – BUS GARAGE - RECOMMENDED ENERGY CONSERVATION MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
ST-27 Exterior Door: East
Face - Mech Room
Door
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$22 $891 0.56 39.6
ST-28 Exterior Door:
West Face -
Exterior
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$10 $410 0.56 39.6
ST-29 Above-Grade Wall:
Upper Wall/R-13
Install R-10 rigid foam
board to exterior and cover
with T1-11 siding or
equivalent.
$551 $32,171 0.38 58.4
ST-30 Lighting: Exterior Replace with 4 LED 80W
Module StdElectronic
$168 $14,700 0.18 87.4
ST-31 Window/Skylight:
North Face
Replace existing window
with U-0.30 vinyl window
$49 $4,553 0.17 93.4
ST-32 Window/Skylight:
West Face
Replace existing window
with U-0.30 vinyl window
$56 $5,203 0.17 93.6
ST-33 Cathedral Ceiling:
Roof
Install R-5 rigid board
insulation. No cost included
for covering insulation.
$140 $18,489 0.17 132
ST-34 Window/Skylight:
South Face
Replace existing window
with U-0.30 vinyl window
$64 $6,504 0.16 102.2
ST-35 Lighting: Utility Replace with 5 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$2 $750 0.04 345.3
ST-36 Lighting: Garage Replace with 5 FLUOR (6)
T5 45.2" F54W/T5 HO
Standard (2) StdElectronic
-$34 $2,000 -0.26 -59.2
TOTAL $41,312 $231,644 2.33 5.6
a Due to advances in refrigerators in the previous 5 years, new Energy Star refrigerators are much more efficient and result in
viable energy savings.
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
b This item is intended to be implemented once the existing instant start ballasts fail and require replacement, negating the cost of
installing new ballasts.
c ECM item was modeled with separate AkWarm model and as a result, the item is not an additive measure and is not included in
the final totals.
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
PRIORITY LIST – PORTABLE BUILDING - RECOMMENDED ENERGY CONSERVATION MEASURES
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.
$1,180 $1,000 14.48 0.8
PB-2 Exposed Floor:
Portable Building -
Floor
Install R-21 densepack
insulation in cantilevered
floor
$221 $960 4.77 4.3
PB-3 Above-Grade Wall:
Portable Building -
2x4 Stud Wall
Install R-25 rigid foam
board to exterior and cover
with T1-11 siding or
equivalent.
$1,660 $12,293 2.79 7.4
PB-4 Cathedral Ceiling:
Portable Building -
Cold Roof
Add R-19 dense-pack to
existing insulation.
$253 $1,943 2.69 7.7
PB-5 Exterior Door:
Portable Building -
Doors
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$77 $781 2.03 10.2
PB-6 Air Tightening Perform air sealing to reduce
air leakage by 30%.
$96 $700 1.20 7.3
PB-7 Window/Skylight:
Portable Building -
Single Pane
Windows
Replace existing window
with U-0.35 wood window
$145 $3,270 0.68 22.6
PB-8 Lighting:
Flourescent
Lighting
Replace with 11 FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor
$100 $2,350 0.65 23.5
TOTAL $3,731 $23,296 2.78 6.2
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
ENERGY AUDIT REPORT – ENERGY EFFICIENT RECOMMENDATIONS
1. Building Envelope
Insulation
Rank Location Existing Type/R-Value Recommendation Type/R-
Value
Installed
Cost
Annual
Energy
Savings
14 Below- (part or
all) Grade Wall:
East Mech
Room/Concrete/
R-5.6
Wall Type: Strapped Masonry
Insul. Sheathing: None
Masonry Wall: Concrete
block, 2 core
Framed Wall: 2 x 2, 16" on
center
XPS (Blue/Pink Foam), 1.12
inches
Modeled R-Value: 7.2
Install R-20 rigid foam
board to interior or
exterior side of wall. Does
not include cost of
coverings.
$753 $45
15 Below- (part or
all) Grade Wall:
Lower Concrete
Wall/R-5.6
Wall Type: Strapped Masonry
Insul. Sheathing: None
Masonry Wall: Concrete
block, 2 core
Framed Wall: 2 x 2, 16" on
center
XPS (Blue/Pink Foam), 1.12
inches
Modeled R-Value: 7.2
Install R-20 rigid foam
board to interior or
exterior side of wall. Does
not include cost of
coverings.
$12,275 $718
25 Above-Grade
Wall: Upper
Wall/R-13
Wall Type: Single Stud
Siding Configuration: Just
Siding
Insul. Sheathing: None
Structural Wall: 2 x 4, 16
inches on center
R-13 Batt:FG or RW, 3.5
inches
Window and door headers:
Not Insulated
Insulation Quality: Damaged
Modeled R-Value: 10.9
Install R-10 rigid foam
board to exterior and
cover with T1-11 siding
or equivalent.
$32,171 $552
29 Cathedral
Ceiling: Roof
Framing Type: I-Beam (TJI)
Framing Spacing: 24 inches
Insulated Sheathing: XPS
(Blue/Pink Foam), 6.4 inches
Bottom Insulation Layer:
None
Top Insulation Layer: None
Modeled R-Value: 35.3
Install R-5 rigid board
insulation. No cost
included for covering
insulation.
$18,489 $140
ASD Student Transportation Final Energy Audit Report
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Exterior Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
19 Exterior Door:
South Face
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.
$410 $16
22 Exterior Door:
West Face -
Entry Door
Door Type: Metal/FG half
lite
Modeled R-Value: 2.2
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$410 $12
23 Exterior Door:
East Face -
Mech Room
Door
Door Type: Metal -
urethane, no therm. break
Modeled R-Value: 2.5
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$891 $23
24 Exterior Door:
West Face -
Exterior
Door Type: Metal -
urethane, no therm. break
Modeled R-Value: 2.5
Remove existing door
and install standard pre-
hung U-0.16 insulated
door, including hardware.
$410 $10
ASD Student Transportation Final Energy Audit Report
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Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
27 Window/Skylight
: North Face
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-0.30 vinyl
window
$4,553 $49
28 Window/Skylight
: West Face
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-0.30 vinyl
window
$5,203 $56
30 Window/Skylight
: South Face
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-0.30 vinyl
window
$6,504 $64
Air Leakage
Rank Location Estimated Air Leakage Recommended Air
Leakage Target
Installed
Cost
Annual
Energy
Savings
9 Air Tightness estimated as:
2.08 cfm/ft2 of above-grade
shell area at 75 Pascals
Perform air sealing to
reduce air leakage by
20%.
$8,000 $1,576
ASD Student Transportation Final Energy Audit Report
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2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
20 Install control valves to reduce flow to hydronic unit heaters based on
thermostat set point
$3,000 $154
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
1 Garage and Bus
Maintenance
Existing Unoccupied
Heating Setpoint: 68.0 deg
F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Garage and Bus
Maintenance space.
$1,000 $1,606
2 Offices Existing Unoccupied
Heating Setpoint: 70.0 deg
F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Offices space.
$1,000 $944
Ventilation
Rank Recommendation Cost Annual
Energy
Savings
6 Install new high efficiency restroom and breakroom fan motors that are
controlled based on occupancy and timer.
$1,800 $263
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
4 Garage 7 FLUOR (4) T12 4'
F40T12 40W Standard (2)
Magnetic with Manual
Switching
Replace with 7 FLUOR
(4) T8 4' F32T8 32W
Standard (2) Program
StdElectronic
$1,050 $211
5 Large Office 20 FLUOR (4) T12 4'
F40T12 40W Standard (2)
Magnetic with Manual
Switching
Replace with 20 FLUOR
(4) T8 4' F32T8 32W
Standard (2) Program
StdElectronic
$3,000 $472
7 Exterior HPS 150 Watt Magnetic
with Manual Switching
Replace with LED 72W
Module StdElectronic
$400 $46
8 Exterior 2 HPS 150 Watt Magnetic
with Manual Switching
Replace with 2 LED 72W
Module StdElectronic
$800 $93
10 Garage 3 MH 250 Watt Magnetic
with Manual Switching
Replace with 3 FLUOR
(3) T5 45.2" F54W/T5
HO Standard (2)
StdElectronic
$1,200 $126
11 Garage 38 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 38 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$5,700 $572
12 Small Volume
Office
21 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 21 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$3,750 $346
13 Garage 19 MH 400 Watt Magnetic
with Manual Switching
Replace with 19 FLUOR
(6) T5 45.2" F54W/T5
HO Standard (2)
StdElectronic
$7,600 $660
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
16 Large Office 6 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 6 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$900 $71
17 Restroom 8 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 8 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic and Add
new Occupancy Sensor
$1,800 $132
18 Small Volume
Office
17 FLUOR (4) T12 4'
F40T12 40W Standard (2)
Magnetic with Manual
Switching
Replace with 17 FLUOR
(4) T8 4' F32T8 32W
Standard (2) Program
StdElectronic and Add
new Occupancy Sensor
$8,100 $560
21 Exterior 21 HPS 100 Watt Magnetic
with Manual Switching
Replace with 21 LED
50W Module
StdElectronic
$12,600 $675
26 Exterior 4 HPS 150 Watt Magnetic
with Manual Switching
Replace with 4 LED 80W
Module StdElectronic
$14,700 $168
31 Utility 5 FLUOR (2) T12 4'
F40T12 40W Standard
Magnetic with Manual
Switching
Replace with 5 FLUOR
(2) T8 4' F32T8 32W
Standard Program
StdElectronic
$750 $2
32 Garage 5 FLUOR (3) T12 8'
F96T12/HO 110W
Standard (2) Magnetic with
Manual Switching
Replace with 5 FLUOR
(6) T5 45.2" F54W/T5
HO Standard (2)
StdElectronic
$2,000 -$34
33 Garage 6 FLUOR (2) T12 8'
F96T12/HO 110W
Standard Magnetic with
Manual Switching
Replace with 6 FLUOR
(4) T5 45.2" F54W/T5
HO Standard (2)
StdElectronic
$2,400 -$46
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
Other Electrical Equipment
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
3 Head Bolt
Outlet Heaters
134 Head Bolt Heater
Receptacles with Manual
Switching
Add new Clock Timer or
Other Scheduling Control
$40,200 $28,157
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
Appendix E
Site Visit Photos
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
1. Main Entrance 2. Garage Entrance
3. Boiler Room 4. Domestic Hot Water Heater and Pumps
located in boiler room
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
5. Insulation damage located on west upper wall
of garage area next to mezzanine ladder 6. Hydronic Unit Heater located in garage area
7. Roof Vents 8. Boiler Day Tank located in boiler room
9. Exhaust Fans located in fan room above
boiler room
10. Gas-fired Unit Heater located in vehicle
washing bay
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
11. Portable Building 12. Portable Building Baseboard Heater
13. Portable Building Thermostat 14. Air Compressor for Pneumatic Controls
located in fan room
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
Appendix F
Thermographic Photos
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
Coffman Engineers made miscellaneous thermographic images of the ASD Bus Garage building using a
FLIR T300 Infrared Camera. This is not a thermographic study, rather photographs to illustrate easy-to-
identify heat losses.
1. Optical Image, NW Corner. Thermal Image below is indicated by the white border.
2. Thermographic Image, NW Corner. Temperatures indicated by color scale on right. Yellow
indicates heat leakage. The outside temperature was about +35°F.
Questionable weather
stripping along door seam.
Heat loss at
windows is
expected.
Questionable insulation at
window framing.
ASD Student Transportation Final Energy Audit Report
Coffman Engineers, Inc. 6/11/2012 AkWarm No. CIRI-ANC-CAEC-01
3. Optical Image, NW Corner. Thermal Image
below is indicated by the white border.
4. Optical Image, Portable. Thermal Image
below is indicated by the white border.
5. Thermographic image, Front Door.
Possible insulation damage indicated by
arrow.
6. Thermal Image, heat lost through plywood
skirting could be mitigated by additional
insulation.
7. Optical Image, East Side garage man door.
Thermal Image right is indicated by the white
border.
8. Thermal Image, East Side Garage Man
Door. Yellow indicates heat leakage
through door seam.
End of Report