HomeMy WebLinkAboutBBNC-5A8-CAEC Aleknagik K-12 School 2012-EE
ENERGY AUDIT FINAL REPORT
Aleknagik School
Aleknagik, AK 99555
p (907) 842-5280
AkWarm ID No. BBNC-5A8-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
Aleknagik School ........................................................................................................................... 1
I. Executive Summary .................................................................................................................. 1
II. Introduction .............................................................................................................................. 4
III. Energy Audit Process ............................................................................................................. 5
IV. Method of Analysis ................................................................................................................. 6
V. Building Description ................................................................................................................ 8
V.I ARCHITECTURAL DESCRIPTION ............................................................................................................................ 8
V.II MECHANICAL DESCRIPTION ............................................................................................................................... 8
V.III ELECTRICAL DESCRIPTION ................................................................................................................................ 9
VI. Historic Energy Consumption and Cost............................................................................. 10
VI.I ELECTRICAL CONSUMPTION DATA ................................................................................................................... 10
VI.II FUEL OIL CONSUMPTION DATA ...................................................................................................................... 10
VI.III OVERALL ENERGY CONSUMPTION DATA ....................................................................................................... 10
VII. Equipment Inventory and Photo Survey .......................................................................... 12
VIII. Energy Conservation Measures ....................................................................................... 13
VIII.I SCHOOL ECMS .............................................................................................................................................. 13
VIII.II ADMINISTRATIVE CONTROLS FOR ENERGY CONSERVATION AND OPTIMIZATION ......................................... 17
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
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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 Aleknagik School as part of a contract
for:
Alaska Housing Finance Corporation
Contact: Scott Waterman
4300 Boniface Parkway
Anchorage, AK 99510
Email: swaterma@ahfc.us
SW Region School District
Contact: Rick Dallmann
P.O. Box 90
Dillingham, AK 99576
Email: rdallmann@swrsd.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 documented annual utility costs of this 12,426 sq ft facility, averaged over January 2009-December
2010 are as follows:
Electricity $36,222
Oil $80,843
Total $117,065
January 2009-December 2010 Energy Utilization Index (EUI) =209.05 kBtu/sf
January 2009-December 2010 Energy Cost Index = 9.42 $/sf
Energy Conservation Measures (ECMs) calculated to be cost effective are shown below in the Executive
Summary Table with the energy analyst’s best opinion of probable cost, savings, and investment returns.
Be aware that the measures are not additive because of the interrelation of several of the measures. The
cost of each measure for this level of auditing is ± 30% until detailed engineering, specifications, and hard
proposals are obtained. See section VIII for detailed descriptions of all cost effective ECMs.
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Executive Summary – Recommended Energy Conservation Measures (ECMs)
Aleknagik School
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
0a Refrigerators Replace refrigerators /
freezers older than 5 years
old
-- - <10
1 Setback
Thermostat:
Garage
Implement a Heating
Temperature Unoccupied
Setback to 50.0 deg F for
the Garage space.
$503 $200 37.75 0.4
2 Lighting:
Gym
Lighting
Add new Occupancy
Sensors
$774 $550 20.21 0.7
3 Lighting:
Restroom
Add new Occupancy
Sensors
$314 $300 16.11 1.0
4 Lighting:
Library,
Classrooms
and Offices
Add new Occupancy
Sensors, Provide Multi-
Level Switch Control of
light Fixtures and retrofit
T12 light Fixtures with T8
Lamps
$2,184 $4,425 7.59 2.0
5 Lighting:
Arctic
Entries
Replace with 6 FLUOR
CFL, A Lamp 20W
$207 $180 7.35 0.9
6 Exterior
Door: School
- Glass Entry
Doors
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$106 $532 5.39 5
7 Garage
Door:
Garage -
Overhead
Door
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$243 $1,224 5.34 5
8 Lighting:
Kitchen
Replace with FLUOR T8
4' F32T8 32W Standard
Program StdElectronic
$173 $1050 2.55 6.1
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Executive Summary – Recommended Energy Conservation Measures (ECMs)
Aleknagik School
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
9 Air
Tightening
Perform air sealing to
reduce air leakage by 20%.
$4,374 $20,000 2.25 4.6
10 Lighting:
Exterior
Replace with 35 LED 34W
Module StdElectronic
$8,599 $61,250 2.16 7.1
11 Exterior
Door:
Garage -
Man Door
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$38 $532 1.93 14
12 Exterior
Door: School
- Metal
Doors
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$456 $6,381 1.93 14
13 HVAC And
DHW
Replace CP-1 and CP-2
with EC Motors
$1,046 $7,000 1.84 6.7
14 Exposed
Floor:
School -
Utilidor/Cra
wlspace
Floor
Install R-14 rigid board
insulation
$1,022 $20,264 1.36 19.8
15 Window/Sky
light: School
- Not South
Windows
Replace existing window
with U-0.22 vinyl window
$1,302 $21,674 1.16 16.7
16 Window/Sky
light: School
- South
Windows
Replace existing window
with U-0.22 vinyl window
$400 $7,225 1.07 18.1
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.
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II. Introduction
This energy audit was conducted for the Aleknagik School, an approximately 12,426 square foot (sf)
building that includes classrooms, restrooms, administrative offices, and a gymnasium. 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.
Aleknagik, Alaska – Google Maps
Aleknagik School, Alaska – Google Maps
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III. Energy Audit Process
Prior to visiting the school, the first task was to collect and review two years of utility data for electricity
and fuel oil usage. This information was used to analyze operational characteristics, calculate energy
benchmarks for comparison to industry averages, estimate savings potential and establish a baseline to
monitor the effectiveness of implemented energy conservation measures. A spreadsheet was used to enter,
sum, and calculate benchmarks and to graph energy use information (see Appendix A). The primary
benchmark calculation used for comparison and baseline data is the Energy Utilization Index, or EUI (see
Section VI).
After gathering the utility data and calculating the EUI, the next step in the audit process was to review
the architectural and engineering drawings to develop a building profile which documented building age,
type, usage, and major energy consuming equipment or systems such as lighting, Heating, Ventilating,
and Air Conditioning (HVAC), water heating, refrigeration, snow-melt, and etc. The building profile is
utilized to generate, and answer, all possible questions regarding the facility’s energy usage. These
questions were then compared to the energy usage profiles developed during the utility data gathering
step. After this information was gathered, the next step in the process was the physical site investigation
(site visit).
The site visit was completed on August 8, 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. Rick Dallmann of the Southwest Region School District (SWRSD) Maintenance Department1.
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. Rick Dallmann, (907) 842-5280 (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
kitchen, offices, and classrooms. An understanding of how the equipment is used is determined during the
audit.
The collected data was entered into AkWarm Commercial™ software, an energy calculating program for
buildings. The data was processed by AkWarm to model a baseline from which ECMs could be
considered. The model was compared to actual utility costs to ensure the quality of 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
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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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 Aleknagik School is a single story facility, with classrooms, offices, a kitchen and one gym. The
school was built up on piles, which exposes the exterior insulated floor to the elements. The school is
normally operated from 7am to 3pm throughout the August through May school year. The gym is
operated from 8:30am to 4pm throughout the school year. During summer break the school is only used a
few hours per week. There are approximately 38 occupants during regular school hours.
V.I Architectural Description
There are two types of exterior walls in the school. The first wall type is constructed of 2x6 wood studs at
16” on center (O.C.). with R-19 fiberglass batt insulation. This wall type occurs throughout the school,
except at the gym. The second wall type occurs at the gym and is constructed of 1-3/4”x9-1/2” Micro
Lams at 24” O.C. with R-30 fiberglass batt insulation. Both wall types are sided with plywood sheathing
and wood siding. In 1999, the walls of the school were resided with new steel siding. During this project
air sealing was completed and wall penetrations were sealed.
The school is built up on piles and the floor of the entire school is completely above grade. The insulated
floor of the school, except for the gym, hangs from large floor trusses, which creates an accessible
utilidor/crawlspace area under the interior finished floor and exterior insulated floor. According to
architectural drawings the floor is insulated with 5” of rigid insulation (R-25). The utilidor/crawlspace
walls are insulated with 4” of rigid insulation (R-20), and are approximately 2’-6” high. The floor of the
gym does not have a utilidor/space access area. The gym floor joists with R-30 fiberglass batt insulation.
There is ½” plywood sheathing covering the exterior of all floors in the school.
The roof of the school is an insulated hot roof, with approximately 8” of rigid insulation (R-40),
according to architectural drawings. The roof of the school has been rebuilt since the original building
was built; however, the insulation value of the new roof is unknown. For modeling purposes, an R-40
roof was used.
The school windows are all double pane with ¼” air spaces, and have wooden frames. The windows were
all installed during the original construction and are now approximately 30 years old.
The doors of the school are hollow metal doors. The main entry doors are full glass doors. The majority
of the doors are original doors and are now approximately 30 yrs old.
A 12’x16’ insulated garage is on the school campus and is heated with fuel oil. The garage is insulated
with R-19 insulation in the roof and floor and with R-13 insulation in the walls. The garage has one un-
insulated, wood panel overhead garage door and one insulated metal man door. The building houses the
oil day tank for the school’s boilers. The garage is heated with a single oil-fired monitor stove, which
draws heating oil from the 100 gallon day tank.
V.II Mechanical Description
The school is heated with two heating oil boilers, manufactured by Burnham. The boilers and burners are
new and the installation of the boilers finished while CEI was at the school for the August 2011 site visit.
The two boilers are identical, and each boiler is capable of carrying the entire heat load of the building, in
the case that one boiler is down for maintenance. The boilers are rated for 4.2 GPH fuel oil input and 483
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MBH output, and utilize Power Flame burners. The hydronic fluid is 60% propylene glycol and 40%
water. The boilers of the school are typically shut down during summer break and are started up in
August for the school year. The boilers are also controlled by the Johnson Controls Metasys Direct
Digital Control (DDC) system, which allows for outdoor air temperature boiler reset control.
Programmable thermostats are used within the school, allowing temperatures to set back to 62°F during
the night and ramp up to 68°F during occupied times.
Ventilation in the school is provided by two large air handling units (AHUs), located in the building’s fan
room. Both units are manufactured by Bohn and have hydronic heating coils that are supplied with heat
from the boilers to temper outside air. AHU-2 serves the gym, while AHU-1 serves the rest of the school.
The AHUs are controlled with the Metasys DDC system, which turns the AHUs on at 6am and shuts the
units down at 6pm, to reduce the heating load during unoccupied times.
Building hot water is provided by an Amtrol 120 gal indirect hot water heater, which is heated from a
loop from the boiler. Domestic hot water usage was estimated at 38 gallons/day, based on occupancy.
Building cold water is provided by a well and filtration system and then circulated through the facility.
The system is fully automatic and requires only regular maintenance.
Cooking at the school is accomplished with a pilot-light propane range and oven. Propane is transported
as needed from Dillingham and is only used for cooking. Due to the minimal use on irregular schedules,
the propane usage was not modeled in AkWarm.
V.III Electrical Description
Most classroom and office type areas in the Aleknagik School are illuminated with 2' x 4' recessed three
lamp parabolic troffers. These light fixtures were originally installed with T12 lamps and many had bi-
level switching where one light switch would control two lamps and the third lamp is controlled by a
second light switch. Several of these light fixtures have been retrofitted with T8 lamps with electronic
ballasts and have lost the bi-level control function. The restrooms, kitchen, and corridors are illuminated
by a mixture of T8 and T12 light fixtures. The gymnasium is illuminated by high bay T5HO light fixtures
and the arctic entries are illuminated by incandescent can lights.
The exterior lighting consists of approximately (35) 100W high pressure sodium (HPS) wall pack light
fixtures. These light fixtures were observed to be equipped with photo sensor control, shutting off the
light fixtures during the day time.
Other electricity-using equipment not previously described in the mechanical or electrical sections include
a small walk-in freezer (which is shut down in the summer to save energy), a microwave and other
various kitchen equipment, and various user equipment such as projectors, computers, and printers.
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VI. Historic Energy Consumption and Cost
Tables provided in Appendix A, Energy Benchmark Data Report, represent the electric energy usage from
January 2009 through December 2010, obtained from monthly invoices. Fuel oil energy usage for the
facility is shown from July 2008 to June 2010 and is obtained from annual invoices. Nushugak
Cooperative provides the electricity and Delta Western delivers fuel oil to the building.
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. The actual utility bills were not provided to be able to
verify the data received to assure 100 percent accuracy of the data.
VI.II Fuel Oil Consumption Data
The fuel oil utility measures consumption and bills in gallons of fuel oil. The average heat value of fuel
oil #2 is 132,000 BTUs per gallon. Fuel oil is sold to the customer in units of gallons which is equal to
approximately 1.32 Therms of energy.
VI.III Overall Energy Consumption Data
The overall cost for energy use is calculated by dividing the total cost by the total usage. Based on the
electric and fuel oil utility data provided, the average cost for the energy and consumption calculations at
the surveyed facility are summarized in the table below.
Energy Cost and Consumption Data
2009 2010 Average
Electric Rate $0.28 /kWh $0.39 /kWh $0.33 /kWh
#2 Fuel Oil Rate $5.78 /gal $3.85 /gal $4.82 /gal
Total Cost $124,948 $109,183 $117,065
ECI $10.06 /sf $8.79 /sf $9.42 /sf
Electric EUI 29.5 kBtu/sf 30.1 kBtu/sf 29.8 kBtu/sf
Oil EUI 174.7 kBtu/sf 183.8 kBtu/sf 179.3 kBtu/sf
Building EUI 204.2 kBtu/sf 213.9 kBtu/sf 209.0 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 12,426 square feet.
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.
Additionally, photos of various equipment and the building construction were taken during the site visit.
Several photos are included in Appendix E.
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VIII. Energy Conservation Measures
VIII.I School ECMs
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 – Setback Thermostat for Detached Garage
Annual Energy Savings Installed Cost SIR Payback (years)
$502 $200 37.63 0.4
Significant energy savings exist by reducing the room temperature of the detached garage during
unoccupied times. Reducing the temperature of the garage to 50F during unoccupied times will lower the
heat load of the building and reduce heating oil consumption. Refer to item 1 in Appendix D for more
information.
ECM-2 – Upgrade the Gymnasium Lighting Controls
Annual Energy Savings Installed Cost SIR Payback (years)
$774 $550 20.21 0.7
The school gymnasium is illuminated by several high bay fluorescent T5HO light fixtures and a few
fluorescent 2'x2' recessed biaxial light fixtures that are all controlled by wall switches. Bi-level control is
provided in the high bay areas via the wall switches. We recommend providing ceiling mounted
occupancy sensors to control the all of the light fixtures in the gym.
This description is for a compilation of several ECM’s that are intended to be implemented at the same
time, however due to constraints with the AKWarm modeling software the different lighting
configurations were modeled separately. See measures 2 and 7 in Appendix D for details of individual
measures.
ECM-3 – Upgrade the Restroom Lighting Controls
Annual Energy Savings Installed Cost SIR Payback (years)
$314 $300 16.11 1.0
There are two bathrooms in the school building with fluorescent T8 light fixtures that are controlled with
a keyed wall switch. Providing occupancy sensor control via ceiling mounted occupancy sensors for the
ten fluorescent T8 light fixtures will result in significant energy savings due to more frequent switching.
Refer to item 3 in Appendix D for more information.
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ECM-4 – Upgrade the Lighting in the Library, Classrooms, and the Principals Office
Annual Energy Savings Installed Cost SIR Payback (years)
$2,184 $4,425 7.59 2.0
The classrooms, library and principals office are all primarily illuminated by 2'x4' three lamp fluorescent
parabolic light fixtures that are equipped with both T8 and T12 lamps. These light fixtures were originally
installed with bi-level switching capability, but through years of maintenance this feature has been
eliminated in many of the light fixtures. We recommend retrofitting all of the T12 light fixtures with T8
lamps, replacing the ballasts, providing bi-level control of all the light fixtures and providing ceiling
mounted occupancy sensors for lighting control in the office and classrooms.
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, 5, 8, 11, 12, and 13 in Appendix D for details of
individual measures
ECM-5 – Upgrade the Arctic Entry Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$207 $180 7.35 0.9
The arctic entries are illuminated by recessed incandescent light fixtures. It is recommended that the
existing incandescent lamps be replaced with parabolic aluminized reflector (PAR) LED's or compact
fluorescent lamps (CFL). Refer to item 6 in Appendix D for more information.
ECM-6 – Replace Glass Entry Door
Annual Energy Savings Installed Cost SIR Payback (years)
$106 $532 5.39 5
The main entry door to the school is a metal frame, full glass door. Replacing this glass door with an
insulated U-0.16 (R-6.25) door will reduce conductive heat loss. It is recommended that the new door
have adequately installed brush weather-stripping to prevent air infiltration around the perimeter of the
door. Refer to item 9 in Appendix D for more information.
ECM-7 – Replace Overhead Garage Door
Annual Energy Savings Installed Cost SIR Payback (years)
$243 $1,224 5.34 5
It is recommended that the wood panel overhead door of the detached garage be replaced with a new R-7,
2” polyurethane core replacement door. This door replacement will reduce conductive heat loss and lower
the heating load of the garage. Refer to item 10 in Appendix D for more information.
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ECM-8 – Upgrade the Kitchen Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$173 $1050 2.55 6.1
The kitchen is illuminated with both T8 and T12 fluorescent wrap around light fixtures. It is
recommended that the T12 light fixtures be replaced one for one with T8 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 14, and 20 in Appendix D for details of individual
measures
ECM-9 – Air Tightening
Annual Energy Savings Installed Cost SIR Payback (years)
$4,374 $20,000 2.25 4.6
By tightening the building envelope with air sealing improvements, infiltration into the building will be
reduced. This in turn will reduce the heating load required by the building and reduce the amount of
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. Refer to item 15 in Appendix D for more
information.
ECM-10 – Upgrade the Exterior Lighting
Annual Energy Savings Installed Cost SIR Payback (years)
$8,599 $61,250 2.16 7.1
There are approximately 35 HPS wall pack light fixtures lighting the exterior of the Aleknagik School. It
is recommended to replace the existing light fixtures with LED source wall pack fixtures. Refer to item 16
in Appendix D for more information.
ECM-11 – Replace Detached Garage Man Door
Annual Energy Savings Installed Cost SIR Payback (years)
$38 $532 1.93 14
There is one exterior metal man door in the detached garage. This is an original door and it is
recommended that it be replaced with newer energy efficient insulated U-0.16 (R-6.25) door. Replacing
this door will reduce conductive heat loss and reduce heating oil consumption. It is recommended that the
new doors have adequately installed brush weather-stripping to prevent air infiltration around the
perimeter of the door. Refer to item 17 in Appendix D for more information.
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ECM-12 – Replace School Metal Doors
Annual Energy Savings Installed Cost SIR Payback (years)
$456 $6,381 1.93 14
There are six exterior metal man doors and three exterior metal double doors throughout the school.
These are original doors and it is recommended that they be replaced with newer energy efficient
insulated U-0.16 (R-6.25) doors. Replacing these doors will reduce conductive heat loss and reduce
heating oil consumption. It is recommended that the new doors have adequately installed brush weather-
stripping to prevent air infiltration around the perimeter of the door. Refer to item 18 in Appendix D for
more information.
ECM-13 - New EC Pumps for CP-1 and CP-2
Annual Energy Savings Installed Cost SIR Payback (years)
$1,046 $7,000 1.84 6.7
The two existing circulation pumps (CP-1 and CP-2) 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 will save electricity consumption. Refer to item 19 in Appendix
D for more information.
ECM-14 – Add Insulation to School Utilidor/Crawlspace Floor
Annual Energy Savings Installed Cost SIR Payback (years)
$1,022 $20,264 1.36 19.8
Installing additional insulation to the above-grade utlilidor/crawlspace of the school will reduce
conductive heat loss and reduce heating oil consumption. It is recommended that R-14 minimum rigid
insulation be installed to the interior side of the crawlspace floor. Refer to item 21 in Appendix D for
more information.
ECM-15 – Replace Original South Facing Windows
Annual Energy Savings Installed Cost SIR Payback (years)
Replacing the School’s original south facing wood frame windows with new U-0.22 windows will reduce
conductive heat loss and reduce air infiltration around the window frame. This will reduce heating oil
consumption while increasing the comfort of school’s occupants. This ECM is a combination of items 22
and 23 as modeled in the AkWarm program. See items 22 and 23 in Appendix D for more information.
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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.
Aleknagik School Final Energy Audit Report
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Appendix A
Energy Benchmark Data
Aleknagik School Draft Energy Audit Report
First Name Last Name Middle Name Phone
Rick Dallmann 842-5280
State Zip
AK 99576
Monday-
Friday
Saturday Sunday Holidays
8 to 5 0 0 0
Average # of
Occupants
During
38
Renovations/Notes
Date
None
SW Region School District Regional Education Attendance
Area
05/09/11
REAL Preliminary Benchmark Data Form
PART I – FACILITY INFORMATION
Facility Owner Facility Owned By Date
Building Name/ Identifier Building Usage Building Square Footage
Aleknagik School 12,426
Building Type Community Population Year Built
Mixed 225 1982
Facility Address Facility City Facility Zip
Aleknagik 99555
Contact Person
Email
rdallmann@swrsd.org
Mailing Address City
P.O. Box 90 Dillingham
Primary
Operating
Hours
Details
Coffman Engineers, Inc.AkWarm No. BBNC-5A8-CAEC-01
Note:
PART II – ENERGY SOURCES
Heating Oil Electricity Natural Gas Propane Wood Coal
$ /gallon $ / kWh $ / CCF $ / gal $ / cord $ / ton
Other energy
sources?
Describe
Specific information on drawings is unavailable from facility owner.
What drawings may be available are maintained at the school for maintenance.
1. Please check every energy source you use in the table below. If known, please enter the base rate you pay
for the energy source.
2. Provide utilities bills for the most recent two-year period for each energy source you use.
Coffman Engineers, Inc.AkWarm No. BBNC-5A8-CAEC-01
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. AkWarm No. BBNC-5A8-CAEC-01 Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
Aleknagik School Draft Energy Audit Report
Aleknagik
Buiding Size Input (sf) =12,426
2009 Electric Consumption (kWh)107,280
2009 Electric Cost ($)29,867
2009 Oil Consumption (Therms)21,714
2009 Oil Cost ($)95,081
2009 Total Energy Use (kBtu)2,537,547
2009 Total Energy Cost ($)124,948
Annual Energy Use Intensity (EUI)
2009 Electricity (kBtu/sf)29.5
2009 Oil (kBtu/sf) 174.7
2009 Energy Utilization Index (kBtu/sf)204.2
Annual Energy Cost Index (ECI)
2009 Electric Cost Index ($/sf)2.40
2009 Oil Cost Index ($/sf)7.65
2009 Energy Cost Index ($/sf)10.06
2010 Electric Consumption (kWh)109,600
2010 Electric Cost ($)42,578
2010 Oil Consumption (Therms)22,836
2010 Oil Cost ($)66,605
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2010 Oil Cost ($)66,605
2010 Total Energy Use (kBtu)2,657,665
2010 Total Energy Cost ($)109,183
Annual Energy Use Intensity (EUI)
2010 Electricity (kBtu/sf)30.1
2010 Oil (kBtu/sf)183.8
2010 Energy Utilization Index (kBtu/sf)213.9
Annual Energy Cost Index (ECI)
2010 Electric Cost Index ($/sf)3.43
2010 Oil Cost Index ($/sf)5.36
2010 Energy Cost Index ($/sf)8.79
Note:
1 kWh = 3,413 Btu's
1 Therm = 100,000 Btu's
1 CF ≈ 1,000 Btu's
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Aleknagik School Final Energy Audit Report
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Aleknagik SchoolDraft Energy Audit ReportAleknagikElectricityBtus/kWh =3,413Provider Customer # Month Start Date End Date Billing Days Consumption (kWh) Consumption (Therms) Demand Use Electric Cost ($) Unit Cost ($/kWh) Demand Cost ($)Nushagak 933-2 Jan-09 1/1/2009 1/31/2009 31 8,960 306NO DATANO DATANushagak 933-2 Feb-09 2/1/2009 2/28/2009289,680330NO DATANO DATANushagak 933-2 Mar-09 3/1/2009 3/31/2009319,760333NO DATANO DATANushagak 933-2 Apr-09 4/1/2009 4/30/20093010,800369NO DATANO DATANushagak 933-2 May-09 5/1/2009 5/31/20093110,960374NO DATANO DATANushagak 933-2 Jun-09 6/1/2009 6/30/2009304,480153$2,180$0.49Nushagak933-2 Jul-09 7/1/2009 7/31/2009313,920134$4,092$1.04Nushagak 933-2 Aug-09 8/1/2009 8/31/2009314,880167$4,358$0.89Nushagak 933-2 Sep-09 9/1/2009 9/30/20093010,400355$7,406$0.71Nushagak 933-2 Oct-09 10/1/2009 10/31/20093112,080412$4,237$0.35Nushagak 933-2 Nov-09 11/1/2009 11/30/20093011,120380$3,940$0.35Nushagak 933-2 Dec-09 12/1/2009 12/31/20093110,240349$3,654$0.36Nushagak 933-2 Jan-10 1/1/2010 1/31/2010319,360319$3,362$0.36Nushagak 933-2 Feb-10 2/1/2010 2/28/20102810,080344$6,964$0.69Nushagak 933-2 Mar-10 3/1/2010 3/31/20103112,320420$4,336$0.35Nushagak 933-2 Apr-10 4/1/2010 4/30/20103011,680399$4,121$0.35Nushagak 933-2 May-10 5/1/2010 5/31/20103112,000410$4,225$0.35Nushagak 933-2 Jun-10 6/1/2010 6/30/2010303,760128$1,375$0.37Nushagak 933-2 Jul-10 7/1/2010 7/31/2010312,960101$1,090$0.37Nushagak 933-2 Aug-10 8/1/2010 8/31/2010314,720161$1,816$0.38Nushagak 933-2 Sep-10 9/1/2010 9/30/20103011,120380$3,912$0.35Nushagak 933-2 Oct-10 10/1/2010 10/31/20103110,480358$3,712$0.35Nushagak 933-2 Nov-10 11/1/2010 11/30/20103011,760401$4,236$0.36Nushagak 933-2 Dec-10 12/1/2010 12/31/2010319,360319$3,429$0.37Jan - 09 to Dec - 09 total:107,2803,6610$29,867$0Jan - 10 to Dec - 10 total:109,6003,7410$42,578$0$0.28$0.39Jan - 10 to Dec - 10 avg:Jan - 09 to Dec - 09 avg:Coffman Engineers, Inc.AkWarm No. BBNC-5A8-CAEC-01Coffman Engineers, Inc.AkWarm No. BBNC-5A8-CAEC-01Aleknagik School Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. BBNC-5A8-CAEC-01 Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
Aleknagik SchoolDraft Energy Audit Report$3,000$4,000$5,000$6,000$7,000$8,0006,0008,00010,00012,00014,000Electric Cost ($)Electric Consumption (kWh)Aleknagik ‐Electric Consumption (kWh) vs. Electric Cost ($)Electric Consumption (kWh)Electric Cost ($)Coffman Engineers, Inc.AkWarm No. BBNC-5A8-CAEC-01$0$1,000$2,00002,0004,000Date (Mon ‐Yr)Aleknagik School Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. BBNC-5A8-CAEC-01 Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
Aleknagik SchoolDraft Energy Audit ReportAleknagikOilBtus/Gal =132,000Provider Customer # Month Start Date End Date Billing Days Consumption (Gal) Consumption (Therms) Demand Use Oil Cost ($) Unit Cost ($/Therm) Demand Cost ($)Delta WesternJul-08 7/1/2008 7/31/20083100$00.00Delta WesternAug-08 8/1/2008 8/31/20083100$00.00Delta WesternSep-08 9/1/2008 9/30/20083000$00.00Delta WesternOct-08 10/1/2008 10/31/20083100$00.00Delta WesternNov-08 11/1/2008 11/30/20083000$00.00Delta WesternDec-08 12/1/2008 12/31/20083100$00.00Delta WesternJan-09 1/1/2009 1/31/20093100$00.00Delta WesternFeb-09 2/1/2009 2/28/20092800$00.00Delta WesternMar-09 3/1/2009 3/31/20093100$00.00Delta WesternApr-09 4/1/2009 4/30/20093000$00.00Delta WesternMay-09 5/1/2009 5/31/20093100$00.00Delta WesternJun-09 6/1/2009 6/30/20093016,45021,714$95,0814.38Delta WesternJul-09 7/1/2009 7/31/20093100$00.00Delta WesternAug-09 8/1/2009 8/31/20093100$00.00Delta WesternSep-09 9/1/2009 9/30/20093000$00.00Delta WesternOct-09 10/1/2009 10/31/20093100$00.00Delta WesternNov-09 11/1/2009 11/30/20093000$00.00Delta WesternDec-0912/1/200912/31/20093100$00.00Delta WesternJan-101/1/20101/31/20103100$00.00Delta WesternFeb-102/1/20102/28/20102800$00.00Delta WesternMar-103/1/20103/31/20103100$00.00Delta WesternApr-104/1/20104/30/20103000$00.00Delta WesternMay-105/1/20105/31/20103100$00.00Delta WesternJun-106/1/20106/30/20103017,30022,836$66,6052.92Jul - 08 to Jun - 09 total:16,45021,7140$95,081$0Jul - 09 to Jun - 10 total:17,30022,8360$66,605$0Jul - 08 to Jun - 09 avg:4.38Jul - 09 to Jun - 10 avg:2.92Coffman Engineers, Inc.AkWarm No. BBNC-5A8-CAEC-01Coffman Engineers, Inc.AkWarm No. BBNC-5A8-CAEC-01Aleknagik School Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. BBNC-5A8-CAEC-01 Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
Aleknagik SchoolDraft Energy Audit Report$30,000.00 $40,000.00 $50,000.00 $60,000.00 $70,000.00 $80,000.00 $90,000.00 $100,000.00 10,00015,00020,00025,000Oil Cost ($)Oil Consumption (Therms)Aleknagik - Oil Consumption (Therms) vs. Oil Cost ($)Oil Consumption (Therms)Oil Cost ($)Coffman Engineers, Inc.AkWarm No. BBNC-5A8-CAEC-01$0.00 $10,000.00 $20,000.00 05,000Date (Mon - Yr)Aleknagik School Final Energy Audit Report Coffman Engineers, Inc. AkWarm No. BBNC-5A8-CAEC-01 Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
Appendix B
AkWarm Commercial Reports
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 11/11/2011 2:37
PM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Aleknagik K-12 School Auditor Company: Coffman Engineers, Inc.
Address: Aleknagik Auditor Name: Walter Heins, PE
City: Aleknagik Auditor Address: 800 F Street
Anchorage, AK 99501 Client Name: Rick Dallmann
Client Address: P.O. Box 90
Dillingham, AK 99576
Auditor Phone: (907) 276-6664
Auditor FAX:
Client Phone: (907) 842-5280 Auditor Comment:
Client FAX:
Design Data
Building Area: 12,426 square feet Design Heating Load: Design Loss at Space:
611,420 Btu/hour with Distribution Losses: 611,420
Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency
and 25% Safety Margin: 932,042 Btu/hour
Note: Additional Capacity should be added for DHW
load, if served.
Typical Occupancy: 38 people Design Indoor Temperature: 67.7 deg F (building
average)
Actual City: Aleknagik Design Outdoor Temperature: -22.2 deg F
Weather/Fuel City: Aleknagik Heating Degree Days: 11,751 deg F-days
Utility Information
Electric Utility: Nushagak Electric Cooperative -
Commercial - Sm
Natural Gas Provider: None
Average Annual Cost/kWh: $0.330/kWh Average Annual Cost/ccf: $0.000/ccf
Aleknagik School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01 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 $57,946 $0 $640 $21,130 $4,181 $0 $0 $6,509 $0$90,405 With Proposed Retrofits $46,302 $0 $657 $8,856 $4,181 $0 $0 $6,509 $0$66,506 SAVINGS $11,644 $0 -$18 $12,273 $0 $0 $0 $0 $0$23,900
Aleknagik School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01 $0$20,000$40,000$60,000$80,000$100,000Existing RetrofitVentilation and FansSpace HeatingOther ElectricalLightingDomestic Hot WaterAnnual Energy Costs by End Use
Aleknagik School Final Energy Audit Report
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Appendix C
Major Equipment List
Aleknagik School Final Energy Audit Report Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01 MAJOR EQUIPMENT INVENTORY TAG LOCATION FUNCTION MAKE MODEL TYPE CAPACITY EFFICIENCY MOTOR SIZE ASHRAE SERVICE LIFE (YEARS) ESTIMATED REMAINING USEFUL LIFE (YEARS) B‐1 Boiler Rm Building Heating Burnham ‐ Oil Fired, Cast Iron 4.2 GPH Input 483 MBH Output 80% ‐ 30 30 B‐2 Boiler Rm Building Heating Burnham ‐ Oil Fired, Cast Iron 4.2 GPH Input 483 MBH Output 80% ‐ 30 30 AHU‐1 Fan Rm School Ventilation Bohn HD12ALF Constant Volume with Hydronic Heating Coil ‐ ‐ 5 HP 25 0 AHU‐2 Fan Rm Gym Ventilation Bohn HD17ALA Constant Volume with Hydronic Heating Coil ‐ ‐ 5 HP 25 0 CP‐1 Boiler Rm Heating Water Circ GRUNDFOS UPS 50‐160F INLINE ‐ NEMA STANDARD 1.5 HP 10 10 CP‐2 Boiler Rm Heating Water Circ GRUNDFOS UPS 50‐160F INLINE ‐ NEMA STANDARD 1.5 HP 10 10 Monitor Heater Garage Garage Heater Monitor ‐ Oil‐Fired 20,000 Btu/hr ‐ ‐ ‐ ‐ Water Heater Boiler Rm DHW Amtrol Boilermate Indirect 119 gal ‐ ‐ 15 5
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Appendix D
Energy Conservation Measures
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PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Setback Thermostat:
Garage
Implement a Heating
Temperature Unoccupied
Setback to 50.0 deg F for
the Garage space.
$503 $200 37.75 0.4
2 Lighting: Gym
Lighting
Add new Occupancy
Sensor
$685 $450 23.45 0.7
3 Lighting: Restroom Add new Occupancy
Sensor
$314 $300 16.11 1
4 Lighting: Classroom
and Office
Add new Occupancy
Sensor
$277 $285 14.98 1
5 Lighting: Classroom
and Office
Add new Occupancy
Sensor, Multi-Level
Switch
$996 $1,370 11.19 1.4
6 Lighting: Corridor
and Library
Replace with 6 FLUOR
CFL, A Lamp 20W
$207 $180 7.35 0.9
7 Lighting: Gym
Lighting
Add new Occupancy
Sensor
$89 $100 5.67 1.1
8 Lighting: Classroom
and Office
Replace with FLUOR (3)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor, Multi-Level
Switch
$68 $190 5.48 2.8
9 Exterior Door:
School - Glass Entry
Doors
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$106 $532 5.39 5
10 Garage Door: Garage
- Overhead Door
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$243 $1,224 5.34 5
11 Lighting: Corridor
and Library
Add new Multi-Level
Switch
$189 $550 5.29 2.9
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PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
12 Lighting: Classroom
and Office
Add new Multi-Level
Switch
$114 $350 5.00 3.1
13 Lighting: Classroom
and Office
Replace with 10 FLUOR
(3) T8 4' F32T8 32W
Standard (2) Program
StdElectronic and Add new
Occupancy Sensor
$540 $1,680 4.95 3.1
14 Lighting: Kitchen Replace with 4 FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
$126 $600 3.24 4.7
15 Air Tightening Perform air sealing to
reduce air leakage by 20%.
$4,374 $20,000 2.25 4.6
16 Lighting: Exterior Replace with 35 LED 34W
Module StdElectronic
$8,599 $61,250 2.16 7.1
17 Exterior Door:
Garage - Man Door
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$38 $532 1.93 14
18 Exterior Door:
School - Metal Doors
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$456 $6,381 1.93 14
19 HVAC And DHW Replace CP-1 and CP-2
with EC Motors
$1,046 $7,000 1.84 6.7
20 Lighting: Kitchen Replace with 3 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$47 $450 1.62 9.5
21 Exposed Floor:
School -
Utilidor/Crawlspace
Floor
Install R-14 rigid board
insulation
$1,022 $20,264 1.36 19.8
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
22 Window/Skylight:
School - Not South
Windows
Replace existing window
with U-0.22 vinyl window
$1,302 $21,674 1.16 16.7
23 Window/Skylight:
School - South
Windows
Replace existing window
with U-0.22 vinyl window
$400 $7,225 1.07 18.1
24 Above-Grade Wall:
School - 2x6 Walls
Install R-20 rigid foam
board to exterior and cover
with T1-11 siding or
equivalent.
$2,035 $69,942 0.78 34.4
25 Above-Grade Wall:
School -
Utilidor/Crawlspace
Walls
Add R-10 rigid foam to
interior or exterior of
existing wall; cost does not
include siding or wall
coverings.
$101 $4,356 0.62 43.3
26 Lighting: Storage
and Utility
Replace with FLUOR (2)
CFL, A Lamp 20W
$6 $60 0.61 10.6
27 Lighting: Storage
and Utility
Replace with 8 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$16 $1,200 0.20 76.9
TOTAL $23,900 $228,344 1.72 9.6
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-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
21 Exposed Floor:
School -
Utilidor/Crawlspac
e Floor
Framing Type: I-Joist (TJI)
Insulating Sheathing: XPS (Blue/Pink
Foam), 5 inches
Top Insulation Layer: None
Bottom Insulation Layer: None
Modeled R-Value: 31.2
Install R-14 rigid
board insulation
$20,264 $1,022
24 Above-Grade Wall:
School - 2x6 Walls
Wall Type: Single Stud
Siding Configuration: Siding and
Sheathing
Insul. Sheathing: None
Structural Wall: 2 x 6, 16 inches on center
R-19 Batt:FG or RW, 5.5 inches
Window and door headers: Insulated
Modeled R-Value: 16.7
Install R-20 rigid
foam board to
exterior and cover
with T1-11 siding or
equivalent.
$69,942 $2,035
25 Above-Grade Wall:
School -
Utilidor/Crawlspac
e Walls
Wall Type: Single Stud
Siding Configuration: Siding and
Sheathing
Insul. Sheathing: XPS (Blue/Pink Foam), 4
inches
Structural Wall: 2 x 4, 16 inches on center
None
Window and door headers: Insulated
Modeled R-Value: 24.7
Add R-10 rigid foam
to interior or exterior
of existing wall; cost
does not include
siding or wall
coverings.
$4,356 $101
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
Exterior Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
9 Exterior Door:
School - Glass
Entry Doors
Door Type: R-1 Door (non-
standard, not exterior)
Modeled R-Value: 1
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$532 $106
10 Garage Door:
Garage - Overhead
Door
Door Type: Uninsulated, 3/8"
Wood panel
Insulating Blanket: None
Modeled R-Value: 1.8
Replace existing garage
door with R-7, 2"
polyurethane core
replacement door.
$1,224 $243
17 Exterior Door:
Garage - Man 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.
$532 $38
18 Exterior Door:
School - Metal
Doors
Door Type: Metal - urethane,
no therm. break
Modeled R-Value: 2.5
Remove existing door and
install standard pre-hung U-
0.16 insulated door,
including hardware.
$6,381 $456
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
22 Window/Skylight:
School - Not South
Windows
Glass: Double, glass
Frame: Aluminum, No Thermal Break
Spacing Between Layers: Quarter Inch
Gas Fill Type: Air
Modeled U-Value: 0.87
Solar Heat Gain Coefficient: 0.46
Replace existing
window with U-
0.22 vinyl
window
$21,674 $1,302
23 Window/Skylight:
School - South
Windows
Glass: Double, glass
Frame: Aluminum, No Thermal Break
Spacing Between Layers: Quarter Inch
Gas Fill Type: Air
Modeled U-Value: 0.87
Solar Heat Gain Coefficient: 0.46
Replace existing
window with U-
0.22 vinyl
window
$7,225 $400
Air Leakage
Rank Location Estimated Air Leakage Recommended Air Leakage
Target
Installed
Cost
Annual
Energy
Savings
15 Air Tightness estimated as: 0.83
cfm/ft2 of above-grade shell
area at 75 Pascals
Perform air sealing to
reduce air leakage by 20%.
$20,000 $4,374
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
19 Replace CP-1 and CP-2 with EC Motors $7,000 $1,046
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
1 Garage Existing Unoccupied Heating
Setpoint: 60.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 50.0 deg F for
the Garage space.
$200 $503
Ventilation
Rank Recommendation Cost Annual
Energy
Savings
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
2 Gym Lighting 8 FLUOR (4) T5 45.2"
F54W/T5 HO Standard (2)
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$450 $685
3 Restroom 10 FLUOR (2) T8 4' F32T8
32W Standard Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor
$300 $314
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
4 Classroom and
Office
16 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching, Multi-Level Switch
Add new Occupancy
Sensor
$285 $277
5 Classroom and
Office
32 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Occupancy
Sensor, Multi-Level Switch
$1,370 $996
6 Corridor and
Library
6 INCAN A Lamp, Std 75W
with Manual Switching
Replace with 6 FLUOR
CFL, A Lamp 20W
$180 $207
7 Gym Lighting 4 FLUOR (2) T5 45.2" F28T5
28W Standard StdElectronic
with Manual Switching
Add new Occupancy
Sensor
$100 $89
8 Classroom and
Office
FLUOR (3) T12 4' F40T12
40W Standard (2) Magnetic
with Manual Switching
Replace with FLUOR (3)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
and Add new Occupancy
Sensor, Multi-Level Switch
$190 $68
11 Corridor and
Library
22 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Multi-Level
Switch
$550 $189
12 Classroom and
Office
14 FLUOR (3) T8 4' F32T8
32W Standard (2) Program
StdElectronic with Manual
Switching
Add new Multi-Level
Switch
$350 $114
13 Classroom and
Office
10 FLUOR (3) T12 4' F40T12
40W Standard (2) Magnetic
with Manual Switching, Multi-
Level Switch
Replace with 10 FLUOR
(3) T8 4' F32T8 32W
Standard (2) Program
StdElectronic and Add new
Occupancy Sensor
$1,680 $540
14 Kitchen 4 FLUOR (4) T12 4' F40T12
40W Standard (2) Magnetic
with Manual Switching
Replace with 4 FLUOR (4)
T8 4' F32T8 32W Standard
(2) Program StdElectronic
$600 $126
16 Exterior 35 HPS 100 Watt Magnetic
with Manual Switching
Replace with 35 LED 34W
Module StdElectronic
$61,250 $8,599
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
20 Kitchen 3 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 3 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$450 $47
26 Storage and Utility INCAN (2) A Lamp, Std 75W
with Manual Switching
Replace with FLUOR (2)
CFL, A Lamp 20W
$60 $6
27 Storage and Utility 8 FLUOR (2) T12 4' F40T12
40W Standard Magnetic with
Manual Switching
Replace with 8 FLUOR (2)
T8 4' F32T8 32W Standard
Program StdElectronic
$1,200 $16
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
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
Appendix E
Site Visit Photos
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
1. Southeast face of school
2. View of school from Lake Aleknagik 3. Front Entry
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
4. Metasys Building Automation Controller 5. AHU-1
6. AHU-2 7. New boilers installed in August 2011
Aleknagik School Final Energy Audit Report
Coffman Engineers, Inc. 6/8/2012 AkWarm No. BBNC-5A8-CAEC-01
8. Circulation Pump
End of Report