HomeMy WebLinkAboutBSSD-UNK-RSA Unalakleet Elementary School 2012-EERichard S. Armstrong, PE, LLC
Mechanical/Electrical Engineer
Comprehensive Energy Audit
of
Unalakleet Elementary School
Unalakleet, Alaska
Project # BSSD!UNK!RSA!01
Prepared for:
Bering Strait School District
Contact: Richard Ried, Maintenance Supervisor
Phone: 907!624!4249
Unalakleet, Alaska
February 17, 2012
Prepared by:
Richard S. Armstrong, PE, LLC
2321 Merrill Field Drive, C$6
Anchorage, AK 99501
and
RSA Engineering, Inc.
2422 Arctic Blvd., Suite 200
Anchorage, AK 99503
Unalakleet Elementary School Comprehensive Energy Audit
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TABLE OF CONTENTS
1. Report Disclaimers 3
2. Executive Summary 4
3. Audit and Analysis Background 8
4. Acknowledgements 10
5. Building Description & Function 11
6. Historic Energy Consumption 14
7. Energy Efficiency Measures Considered or Recommended 15
8. Interactive Effects of Projects 21
9. Loan Program 22
Appendix A: Photos 23
Appendix B: AkWarm!C Report 37
Appendix C: Building Schedules and Plans 48
Performed by: ___________________________
Adam W. Wilson, PE, CEA
CEA # 1618
RSA Engineering, Inc.
Reviewed by: ___________________________
Richard Armstrong, PE, CEM
CEA #178, CEM # 13557
Unalakleet Elementary School Comprehensive Energy Audit
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1. REPORT DISCLAIMERS
The information contained in this report, including any attachments, is
intended solely for use by the building owner and the AHFC. No others
are authorized to disclose, copy, distribute or retain this report, in whole or
part, without written authorization from Richard S. Armstrong, PE, LLC,
2321 Merrill Field Drive, C$6, Anchorage, AK 99501. Additionally, this
report contains recommendations that, in the opinion of the auditor, will
cause the owner to realize energy savings over time. All
recommendations must be designed by a registered engineer, licensed in
the State of Alaska, in the appropriate discipline. Lighting
recommendations should all be first reviewed by running a lighting
analysis to assure that the recommended lighting upgrades will comply
with State of Alaska Statue as well as IES recommendations.
Payback periods may well vary from those forecast due to the uncertainty
of the final installed design, configuration, equipment selected, and
installation costs of recommended Energy Efficiency Measures (EEMs), or
the operating schedules and maintenance provided by the owner.
Furthermore, EEMs are typically interactive, so implementation of one
EEM may impact the cost savings from another EEM. Neither the auditor,
Richard S. Armstrong, PE, LLC, AHFC, or others involved in preparation of
this report will accept liability for financial loss due to EEMs that fail to
meet the forecasted payback periods.
This audit meets the criteria of an Investment Grade Audit (IGA) per the
Association of Energy Engineers definition, and is valid for one year. The
life of the IGA may be extended on a case$by$case basis, at the discretion
of the AHFC.
IGSs are the property of the State, and may be incorporated into AkWarm$
C, the Alaska Energy Data Inventory (ARIS), or other state and/or public
information system.
Unalakleet Elementary School Comprehensive Energy Audit
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Investment Grade Energy Audit
Unalakleet Elementary School
2. Executive Summary:
The Unalakleet Elementary School was constructed in 1958,
received a kindergarten building in 1977, an addition in 1984 and
had an exterior envelope upgrade in 2009. It is owned and operated
by the Bering Strait School District (BSSD). Benchmark energy use
data collected for this building is presented in Table 1 below. The
data includes energy used by the high school also since the
buildings are attached and share utilities. Since the elementary
school is the focus of this audit no information has been included
about the equipment in the high school. This report will recommend
changes and upgrades to the elementary school only. Nonetheless
the proposed energy savings should reduce the amount of fuel
consumed by the elementary school, which will impact the overall
energy used by both schools.
Table 1
2009 2009 2010 2010
Utility Consumption Cost/Year Consumption Cost/Year
Electricity$kWh 286,160 $126,074 293,120 $108,904
No. 2 Fuel Oil $
Gallons
29,391 $110,681 28,430 $ 91,767
Total Energy
Costs $236,755 $200,671
A benchmark measure of energy use relative to other similar function
buildings in the area is the Energy Use Index (EUI), which takes the
total annual energy used by the facility divided by the square footage
area of the building, for a value expressed in terms of kBTU/SF.
This number can then be compared to other buildings to see if it is
about average, higher or lower than similar buildings in the area.
Likewise, the Energy Cost Index (ECI) is the cost of all energy used
by the building expressed in $/SF of building area. The comparative
values for the subject building are listed in Table 2 below:
Unalakleet Elementary School Comprehensive Energy Audit
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Table 2
Unalakleet
Elementary &
High Schools
Shaktoolik K$12
School (neigh$
boring village)
Average for
All BSSD
Schools
Energy Use Index (EUI)
kBTU/SF Avg 2009, 2010
106.2 87.8 125.3
Energy Cost Index (ECI)
Average 2009, 2010
$4.84 $5.89 $6.73
Various Energy Efficiency Measures (EEMs) have been analyzed for
this building to determine if they would be applicable for energy
savings with reasonably good payback periods. Those EEMs that
have a payback period or those that are recommended for code
compliance, life cycle replacement, or other reasons are also
included.
Specific EEMs recommended for this facility are detailed in the
attached AkWarm Energy Audit Report along with specific payback
times, as well as estimated installation costs and estimated energy
savings. The higher priority items are summarized below:
a. Programmable Thermostats: It is recommended that
programmable thermostats be installed so the temperature
in each space can be reduced to a set point of 60 degrees F
when the rooms are not in use. The lower temperature
setback will give an energy savings of about 5% and have a
payback of less than one year.
b. Add Occupancy Sensors for Lighting: None of the interior
spaces are equipped with occupancy sensors for operating
lighting. It is recommended that the lights in classrooms,
offices, the multipurpose room, library, hallways and
restrooms be equipped with occupancy sensors to reduce
the amount of time the lights are on when the spaces are
unoccupied. The annual energy savings will be about 2%
with a payback of approximately 3.5 years.
c. Pumps
i. The main constant volume heating circulations pumps
for the school can be changed out for variable speed
(VFD) pumps. VFD pumps can run at lower speeds
when the school has a low heating demand, which will
Unalakleet Elementary School Comprehensive Energy Audit
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save power and reduce cost. The boiler/heat
exchanger circulation pump can also be turned off
when there is no call for heating, rather than run
continuously as it currently does.
ii. The constant duty domestic water recirculation pump
can be replaced with a pump that runs on a time clock
and only operates during hours that it is needed.
iii. The pump changes will provide about a 1% energy
savings for the building with a payback of about 6.5
years.
d. Ventilation Controls
i. Carbon Dioxide (CO2) Monitoring: CO2 sensors can
be utilized to help reduce the amount of outside air
drawn into the building. Rather than supply a set
minimum amount of outside air during air handler V$1
operation (15% of total V$1 air volume, for example)
the outside air can be varied to maintain the CO2
levels below a determined set point, typically 750
parts per million for schools. This often results in less
outside air being drawn into the building, which
reduces the amount of energy needed to heat the air.
ii. There are multiple restrooms throughout the facility
with exhaust fans that operate using a manual switch,
such as staff restrooms, or are left on during the entire
school day, such as group restrooms. It is
recommended that the fans be operated using
occupancy sensors so they will be certain to only
operate when the rooms are in use. The fan
operation could be connected to the space lighting,
which is also recommended for control using
occupancy sensors.
iii. The above changes to ventilation control will only
provide an estimated 1% annual energy savings with
an expected payback of approximately 8 years. This
is not a big savings, but combined with other energy
saving measures it has an additive affect.
e. Exterior Lighting Upgrade: The existing high pressure
sodium (HPS) lighting can be upgraded to LED fixtures.
Unalakleet Elementary School Comprehensive Energy Audit
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The payback on this is calculated in the model to be about
17 years, however program may not include the energy
savings that LED’s show when used in very cold weather,
such as conditions found at the school. Also, the cost of
LED lighting is rapidly decreasing as they become more
common so the financial information used in the model will
soon be outdated.
In addition to EEMs, various Energy Conservation Measures (ECMs)
are recommended that were not part of the energy audit model.
Some involve a modest capital investment. Others are policies or
procedures that are followed by management and employees that
require no capital outlay. Examples of recommended ECMs for this
facility include:
1. Water closet flushometer valve retrofit for dual level
flushing.
2. Turn off computers, monitors, printers, faxes, coffee
makers, etc., when leaving for the day. These devices
could also be plugged into power strips equipped with
occupancy sensors so they will automatically turn off when
the school is not in use.
3. Provide occupancy sensors for unoccupied spaces such as
bathrooms, storage spaces and utility rooms. The payback
for this change may never be realized but the retrofit serves
to ensure that unseen lighting is not accidentally left on for
long periods of time such as summer break.
4. Install an illuminated indicator to show if crawlspace lighting
is on. It is not practical to install occupancy sensors in the
crawlspace due to the large area. However small light
bulbs or illuminated switches could be installed on the walls
just above the crawlspace access hatches to indicate if the
lighting is on. This will help to reduce the likelihood of
crawlspace lights accidentally being left on.
5. Disconnect refrigeration equipment over the summer,
including walk$in units and residential style refrigerators
throughout the building. This will save approximately
$3,090/year.
Unalakleet Elementary School Comprehensive Energy Audit
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The priority recommendations in the detailed report are estimated to
save $23,914/year, with an installed cost of $51,208, for a 2.1 year
payback. This does not include design or CA services, but overall it
does indicate a cost effective energy savings program.
3. Audit and Analysis Background:
a. Program Description: This audit included services to identify,
develop, and evaluate energy efficiency measures at the
subject building. The scope of this project included evaluating
the building shell, lighting, other electrical systems, and
heating, ventilating, and air conditioning (HVAC) equipment.
Measures were selected such that an overall simple payback
period of 8 years or less could be achieved.
b. Audit Description and Methodology: Preliminary audit
information was gathered in preparation for the site survey,
including benchmark utility consumption data, floor and lighting
plans, and equipment schedules where available. A site visit
was performed to inventory and evaluate the actual building
condition, including:
i. Building envelope (roof, windows, etc)
ii. Heating, ventilating, and air conditioning
iii. Lighting systems and controls
iv. Building specific equipment
v. Plumbing systems
c. Method of Analysis: The information gathered prior to the site
visit and at the site visit is entered into AkWarm$C, an energy
modeling developed for Alaska Housing Finance Corporation
(AHFC) specifically to identify forecasted energy consumption
which can be compared to actual energy consumption.
AkWarm$C also has some pre$programmed EEM retrofit
options that can be analyzed with energy savings forecasted
based on occupancy schedules, utility rates, building
construction type, building function, existing conditions, and
climatic data that is already uploaded to the program based on
the zip code of the building. When new equipment is
Unalakleet Elementary School Comprehensive Energy Audit
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proposed, energy consumption is calculated based on
manufacturer’s cataloged information.
Cost savings are calculated based on the historical energy
costs for the building. Installation costs include labor and
equipment to estimate the full up$front investment required to
implement a change, but design and construction management
costs are excluded. Costs are derived from Means Cost Data,
industry publications, experience of the auditor, local
contractors and equipment suppliers. Maintenance savings
are calculated were applicable and are added to the energy
savings for each EEM.
The cost and savings are applied and a simple payback and
simple return on investment (ROI) is calculated. The simple
payback is based on the number of years that it takes for the
savings to pay back the net installation cost (Net Installation
divided by Net Savings.)
A simple life$time calculation is shown for each EEM. The life$
time for each EEM is estimated based on the typical life of the
equipment being replaced or altered. The energy savings is
extrapolated throughout the life$time of the EEM. The total
energy savings is calculated as the total life$time multiplied by
the yearly savings.
d. Limitations of the Study: All results are dependent on the
quality of input data provided, and can only act as an
approximation. In some instances, several methods may
achieve the identified savings. This report is not intended as a
final design document. A design professional, licensed to
practice in Alaska and in the appropriate discipline, who is
following the recommendations, shall accept full responsibility
and liability for the results. Budgetary estimates for
engineering and design of these projects in not included in the
cost estimate for each measure, but these costs generally run
around 15% of the cost of the work.
Unalakleet Elementary School Comprehensive Energy Audit
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4. Acknowledgements: We wish to acknowledge the help of numerous
individuals who have contributed information that was used to prepare
this report, including:
a. Alaska Housing Finance Corporation (Grantor): AHFC
provided the grant funds, contracting agreements, guidelines,
and technical direction for providing the audits. AHFC
reviewed and approved the final short list of buildings to be
audited based on the recommendation of the Technical
Service Provider (TSP).
b. Bering Strait School District (Owner): The BSSD provided
building access, original construction plans, two years energy
billing data, building schedules and functions, as well as other
resources needed to perform the audit.
c. Central Alaska Engineering Company (Benchmark TSP):
Central Alaska Engineering Company compiled the data
received from the BSSD and entered that data into the
statewide building database, called the Alaska Retrofit
Information System (ARIS).
d. Richard S. Armstrong, PE, LLC (Audit TSP): This is the
TSP who was awarded the projects in the Arctic Slope
Regional Corporation, Bering Strait area, and the Nana area.
The firm gathered all relevant benchmark information provided
to them, cataloged which buildings would have the greatest
potential payback, and prioritized buildings to be audited based
on numerous factors, including the Energy Use Index (EUI),
the Energy Cost Index (ECI), the age of the building, the size
of the building, the location of the building, the function of the
building, and the availability of plans for the building. They
also trained their selected sub$contracted auditors, assigned
auditors to the selected buildings, and performed quality
control reviews of the resulting audits. They prepared a listing
of potential EEMs that each auditor must consider, as well as
the potential EEMs that the individual auditor may notice in the
course of his audit. Richard S. Armstrong, PE, LLC also
Unalakleet Elementary School Comprehensive Energy Audit
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performed some of the audits to assure current knowledge of
existing conditions.
5. Building Description and Function: The subject single$story
structure was built in stages over time. The original school was
constructed in 1958 with a full height basement. The exact
construction of the building is not known. It was likely 2x4 originally
but it appears that an additional layer of 2x4 framing was added later
to increase the wall thickness. The current insulation value is
estimated to be R$24. The basement insulation value is also
estimated to be R$24. In 1972 a small building was attached to the
southeast to serve as a kindergarten classroom. This building is 2x4
construction with an insulation value of about R$11.3. In 1984 an
addition was constructed on the northwest end of the school nearly
doubling the main floor square footage of the school. It is 2x8
construction with an insulation value of approximately R$24. It has a
four foot insulated crawlspace with about R$20 thermal insulation.
The entire building is wood construction. The roof insulation of the
entire building is roughly R$37, with the exception of the kindergarten
classroom which is around R$21. In 2009 the whole structure was
given new siding and a new roof to match the appearance of the
newly remodeled high school, which is attached. The building serves
mainly as an elementary school but also has a multipurpose room that
is used as a dining space for K$12 students. The original structure
(1958) has a library, administrative offices, a teacher workroom, a
bilingual/bicultural classroom, a special education classroom, a
commercial kitchen and a multipurpose room. Ceiling heights are 8
feet, except for the multipurpose room which is about 16 feet. The
basement of the original structure has the boiler room, air handler
room, food storage, maintenance shop and many, many rooms used
for storage. Basement ceiling heights vary between 8 and 10 feet.
The kindergarten addition (1972) is still used as a kindergarten. It has
a ceiling height of about 9 feet. The most recent addition (1984) is
mostly first through sixth grade classrooms, with one boys’ and one
girls’ group restrooms, a custodial closet and a hallway connecting to
the original structure. The classrooms have vaulted ceilings with an
average height of 10 feet 8 inches. The hallway and restroom ceiling
heights are 10 feet. Exterior windows around the entire building
appear to have been installed within the last ten years and are in good
Unalakleet Elementary School Comprehensive Energy Audit
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condition. Overall the building is in very good condition. The building
is occupied from the middle of August through the middle of May. The
school is unused during the summer months.
a. Heating System: The school heating plant is in the basement
of the original (1958) building. The building heating system
consists of two Weil McClain BL488WF cast iron sectional
boilers. The boilers appear to have been installed when the
1984 addition was constructed and serve the elementary
school as well as three junior high school rooms in the high
school building. Hot glycol (mix ratio unknown) is circulated
using multiple Grundfos pumps. One Grundfos model UMC
50$80, 3$speed circulator, set at speed 3, serves the 1984
addition. A similar pump, set at speed 2, serves three junior
high classrooms in the high school building. Both pumps are
operated using time clock thermostats. The kindergarten and
1958 construction are served by multiple smaller Grundfos
pumps, whose control scheme is unknown but most likely
operated using thermostat or zone valve connections. The
pumps are not equipped with variable frequency drives (VFD),
so they run at full speed when they operate. Heat is distributed
throughout the building using fintube baseboard in most
perimeter and some interior spaces including the multipurpose
room and vestibules. The basement is heated using unit
heaters. Supplemental heat is also provided to the school
through the ventilation system.
b. Waste Heat: The school is provided with waste heat from the
local power utility. Unalakleet Valley Electric Cooperative
(UVEC) circulates waste heat from their diesel generators to
multiple buildings in the village. The elementary school has a
flat plate heat exchanger that is connected to the boiler loop.
According to the performance information for the heat
exchanger it is designed to deliver roughly 300 MBH to the
school. There is not any metering equipment installed to
monitor the amount of heat being transferred so the exact
performance is unknown. Based on observations on site it is
assumed that glycol is circulated in a loop between the boilers
and heat exchanger, which keeps the boilers from firing until
Unalakleet Elementary School Comprehensive Energy Audit
13
the heat exchanger is not able to keep up with the heat
demand of the school. A 3$way valve is installed on the boiler
side of the heat exchanger presumably to prevent the boiler
loop from becoming too hot. That heat which does not get
dissipated by the buildings connected to the utility waste heat
loop is rejected by air$cooled radiators at the utility building.
Having spoken with UVEC and BSSD maintenance personnel
it does not appear that anyone currently understands how
much waste heat the school uses or how well the school’s
system operates. While onsite it was observed that the boiler
loop isolation valves were closed off from the heat exchanger,
preventing the school from receiving any heat. This was
immediately corrected by BSSD maintenance personnel. It
does not appear that UVEC charges for the waste heat since
no such utility cost information was provided with the
benchmark information.
c. Ventilation System: There is one air handler in the building as
well as multiple exhaust fans. V$1 was installed in the
basement of the original school in the location where the 1984
construction took place. It serves the multipurpose room in the
1958 construction and the classrooms in the 1984 addition. Air
is supplied from below the floor and blown up across the
heating fintube around the perimeter of the building. Two
heat recovery units (each labeled V$3) are connected between
the outside air, exhaust air and return air ducts for V$1. Air is
relieved from the building through a motorized damper. The
1984 construction plans indicate that the air handler operates
using a time clock and that the V$3 units operate with V$1.
However it appeared that neither V$3 unit was operational.
Ventilation for the 1958 building and the kindergarten
classroom are provided using operable windows. A sidewall
exhaust fan is used for the kitchen cooking hood and another
for the dishwasher hood. It is assumed that he V$1 supply to
the multipurpose room serves as make up air for these units
since the kitchen opens up to that room. Other exhaust fans
include one exhaust fan each for the boys’ and girls’
restrooms, (4) small restroom fans and (2) residential range
hoods. Heating of ventilation (outside) air is a significant
Unalakleet Elementary School Comprehensive Energy Audit
14
source of energy consumption for commercial buildings. State
of Alaska design codes mandate that certain quantities of
ventilation air must be provided. However, there are devices
and strategies that can be employed to regulate the
introduction of ventilation air so energy is not wasted, such as
demand control ventilation based on CO2 concentration.
d. Plumbing System: Water is provided from the village utility
and there is no on$site storage. Fixtures include water closets,
lavatories, classroom sinks, a mop sink, and large sinks for
cooking. Fixtures are located in bathrooms, the custodial
closet and the commercial kitchen. The classroom for the
kindergarten children has an adjoining water closet and
lavatory, and other classrooms have sinks.
e. Domestic Hot Water: How water is generated using a shell
and tube heat exchanger that is piped to the boiler loop. Water
is stored in a tank with an 82 gallon capacity. There is a hot
water recirculation pump that runs constantly to provide instant
hot water to remote fixtures.
f. Lighting: Occupied spaces throughout the building are
provided with T$8 fluorescent fixtures that electronic ballasts
and controlled with wall switches. Exterior lights are high
pressure sodium (HPS) wall pack at 50 watts each. Exterior
lights operate using daylight sensors.
g. Fire Sprinkler: The building is equipped with a fire sprinkler
protection system throughout. Fire sprinkler water is supplied
from the village water utility.
6. Historic Energy Consumption: Energy consumption is modeled
within the AkWarm$C program. The program only analyzes 12
months of data, so where 24 months of data are available, the data is
averaged and input to AkWarm$C to provide more accuracy. The
energy consumption data is presented and graphed in the attached
AkWarm$C program results.
Unalakleet Elementary School Comprehensive Energy Audit
15
Based on the benchmark energy data for 2009 and 2010, the average
electric consumption for the building was 289,640 kWh/year at an
average cost of $117,489/year. The average fuel oil consumption was
28,910 gallons/year, at an average annual cost of $101,224/year.
7. Energy Efficiency Measures Considered or Recommended: The
building was examined for application of a multitude of potential EEMs
that are discussed below. Those EEMs that appear to have an
application for the subject building are further analyzed for estimated
payback periods, either within the AkWarm$C program or separately
within this report. The accuracy of the cost estimates and paybacks
varies significantly due to a multitude of conditions, but is estimated to
be approximately +/$ 25%. Assumptions made regarding energy costs
and the life of the EEM, noting that post$construction measurement
and verification are based on energy savings, not energy cost
savings. Many of the selected EEMs are analyzed within the
AkWarm$C program using the schedules and estimated costs input
into the model.
a. Occupancy Sensors for Lighting: The occupied spaces in
the building can be retrofitted with occupancy sensors so the
lights are only on when rooms are in use. This applies to
hallways, classrooms, offices, storage rooms, the multipurpose
room, and restrooms. Though most rooms will be occupied
during the majority of the school day, certain times of the day,
such as lunchtime, will cause most rooms to be empty.
Allowing lights to turn off automatically during these times will
save energy. Occupancy sensors are not recommended for
the kitchen since it is important that kitchen staff have control
over lighting for their work. Occupancy sensors are not
recommended for the basement and crawlspace since the
spaces are broken up with shelving, boxes and partition walls,
requiring too many sensors to be installed. It is recommended
that a light or illuminated switch be installed above the floor
near the crawlspace access so it is possible to see whether the
crawlspace lights have been turned off without entering the
crawlspace.
Unalakleet Elementary School Comprehensive Energy Audit
16
b. Exterior Lighting Upgrade: High pressure sodium (HPS)
lights are commonly used for building exterior lighting in Alaska
because they perform well in cold weather and are more
efficient than many other types of lighting. However, light
emitting diode (LED) fixtures are proving to be an viable
substitution for HPS. LEDs provide a different type of light
than HPS, both in color and lumen output, that has the effect of
providing a clearer, brighter light while using less power than a
HPS bulb. LEDs have an added benefit of operating more
efficiently (using less power) as the ambient temperature gets
colder. They also have a longer life span and require less
maintenance than HPS fixtures. LED fixtures are traditionally
more expensive than HPS, however that is changing rapidly as
LED lighting becomes more popular. It is recommended that
all HPS wall pack fixtures on the building exterior be replaced
with LED fixtures. This may require engineering assistance to
confirm that the proper fixtures are provided to meet code
required lighting levels.
c. Heating Control: The occupied spaces in the building are
currently heated using hydronic baseboard that is operated
with electric thermostats. The thermostats are analog with
dial$type temperature settings. The 1984 plans indicate there
is a sequence of operation that causes the building to operate
on one thermostat setting during the day and another
thermostat setting at night. Whether the system is still
operating in this manner is unclear. In order to provide
effective, reliable temperature control, including the ability to
adjust space temperature set points based on occupancy, it is
recommended that a programmable, digital thermostat be
installed in each occupied space. This will enable the
temperature to be set at a comfortable level during occupancy,
and allow for reducing the heat when the space is not being
used, which will reduce the amount of energy needed for heat.
A thermostat in each space also allows the flexibility to provide
spaces with heating schedules based on specific times of use.
d. VFD Heating Pumps: In most cases heating circulators are
designed for greater flow rates than is needed during normal
Unalakleet Elementary School Comprehensive Energy Audit
17
operation. Bypass valves are installed to allow the constant
volume of flow to continue even when a small amount of that
flow is providing heat. Energy is wasted circulating heated
glycol that is not needed. There are a number of pumps on
the market that have variable frequency drives (VFD), which
allow the speed of the motor to be adjusted to match the flow
rate demand. Pump affinity laws show that motor speed and
power have a cubic mathematical relationship to each other.
As the pump speed is reduced “X” RPM the power
consumption is reduced by X1/3 watts (or horsepower), showing
that a small change in pump speed has an amplified affect on
power input. Operating pumps at lower speeds when there is
lower flow demand significantly reduces power consumption. It
is recommended that the heating circulators be replaced with
VFD pumps so power savings can be realized.
e. Domestic Hot Water Recirculation: The domestic hot water
system is provided with a small pump that circulates the hot
water loop back to the water heater so there is always hot
water available at the furthest fixtures in the building. This
pump operates constantly, which is unnecessary since hot
water is only needed during building occupancy. It is
recommended that controls be provide for the hot water
recirculation pump so it will only run during school hours, which
will reduce the energy consumed by the pump.
f. Ventilation: Given the age of the air handling unit and
associated controls it would be prudent to consider replacing it
(see item i Existing Equipment Conditions, below). However, if
the existing unit is to remain the following items are worth
addressing.
i. Air Handler Operation: V$1 appears to be operational,
though it is unclear whether the unit is operating
automatically or if building maintenance personnel
intervene with manual control. It is recommended that
the unit be operated automatically and the time clock be
set to match the current occupancy schedule of the
school.
Unalakleet Elementary School Comprehensive Energy Audit
18
ii. Heat Recovery: The heat recovery units (V$3)
associated with the main air handler (V$1) do not appear
to be operational. Given that they were installed to help
recover heating energy from the exhaust air stream it
seems worthwhile to repair them so they are functional.
However it may worth investigating how much power it
takes to operate them compared to how much energy
they recover. It is possible that they cost more to use
than they reclaim in waste heat. This has not been taken
into consideration in the audit.
iii. Supply Air Temperature: It was noted on site that
during very cold weather the air handler supply air was
too cold to send to the classrooms. It is recommended
that the return and outside air mixing dampers, and
related temperature sensors and controls, be serviced
and replaced if necessary to allow for adequate mixing of
V$1 intake air. The heating coil should also be serviced
and repaired as necessary to adequately temper the
supply air.
iv. Carbon Dioxide (CO2) Monitoring: The amount of CO2
in a building has been shown to have a direct effect on
the performance of the occupants in the building. High
levels of CO2 cause occupants to feel sleepy and lose
concentration. It is also an indication that other indoor
contaminants, such as volatile organic compounds
(VOCs), odors and excessive humidity are likely
increasing in concentration. For these reasons
ventilation air is required by code to refresh indoor
building air. Typically the ventilation rate is determined
based on the number of occupants and space sizes. In
many cases this over$ventilates the space. Another
method of ventilating spaces is called demand control
ventilation, which entails varying the amount of outside
air supplied based on CO2 levels in the building.
Sensors can be placed in spaces throughout the building
(preferred) or in the return air duct at V$1, and the
outside air dampers can be modulated to increase or
decrease the outside air delivered to the building.
Unalakleet Elementary School Comprehensive Energy Audit
19
v. Exhaust Fan Sensors: Installing occupancy sensors for
restroom exhaust fans will allow the fans to only run
when the space is occupied. Given the infrequent use of
the restrooms, primarily during lunchtime, they sit vacant
most of the school day and there is no need for the fans
to be on. Operating them only when restrooms are
occupied will reduce the amount of energy consumed.
They can also be interlocked to operate with the local
lighting circuit in order to reduce the amount of sensors
needed.
g. Boiler Temperature Outdoor Air Reset: As the outside air
temperature varies building heat loss varies as well, losing
heat at a faster rate as the ambient temperature drops. Boiler
systems are typically sized to meet the heating demands of the
coldest expected temperatures. These extreme temperatures
may only occur for short durations in a given winter and will
vary in frequency and length year to year. Most cast iron
sectional boilers supply heating glycol at the same temperature
year$round. During periods of warmer weather in the heating
season high heating glycol supply temperatures may cause
space temperatures to overshoot set points because the hot
boiler glycol dumps heat into the building at a faster rate than
the building is losing it, leading to occupant discomfort. This
will also cause the boilers to cycle more often since it takes
less time to heat the returning glycol, putting unnecessary ware
on the boilers. A common way of handling this issue is to use
an outdoor reset controller to reduce the heating loop
temperature so that heat is transferred into the building closer
to the rate at which the building is losing heat. Outdoor reset
varies the boiler or heating loop glycol temperature based on
the ambient temperature – increasing the glycol temperature
when outdoor conditions are cold and decreasing glycol
temperature for warmer outdoor conditions. It was observed
on site that maintenance personnel were manually adjusting
the boiler temperature to give the same effect. In order to
maintain tighter control and prevent issues such as setting the
boiler temperature too low (causing the boiler to condense or
providing inadequate heating glycol temperatures for the hot
Unalakleet Elementary School Comprehensive Energy Audit
20
water generators), or forgetting to reset the boiler temperature,
it is recommended that a controller be installed that will
perform the outdoor reset automatically. There is not a
provision for simulating this in the AkWarm$C program so no
energy savings are considered here. However it is
recommended that a licensed professional engineer perform
the design for installation of this controller at which time an
energy savings analysis could be performed.
h. Waste Heat Metering: The school is provided with waste heat
from the local electric utility, which is a major opportunity to
save energy. However there are not any functional metering
devices on the school waste heat system to know how much
energy the school is receiving from the utility. It is
recommended that sensors and recording devices be installed
that indicate the amount of flow through the heat exchanger,
and the fluid temperatures as it enters and leaves the heat
exchanger on both sides. The device should also record and/
or transmit this data for download to a computer so it can be
clearly seen how the building is receiving and using energy
over time. This kind of information makes it possible to adjust
the school heating system so it is utilizing as much of the
waste heat energy as possible. It may also be of use to the
power utility so they know how much of their rejected heat is
being transmitted as usable energy and how much is being lost
while flowing through delivery pipes.
i. Fuel Oil Metering: It is recommended that fuel oil meters be
installed to track the amount of fuel used by the boilers. The
only methods currently used on site for tracking fuel usage are
recording the amount of fuel put into bulk fuel storage tanks
when they are refilled and maintenance personnel manually
recording the fuel levels in the tanks. Neither method is able to
provide precise information nor does it give a detailed picture
of the rate at which fuel is used. Installing a fuel oil meter on
the boiler fuel line will show the exact amount of fuel consumed
and how quickly. AMCO and other companies manufacture
meters that meet the needs of this site.
Unalakleet Elementary School Comprehensive Energy Audit
21
j. Existing Equipment Condition: It is worth noting that there
are equipment and control issues that should be addressed in
the elementary school. The air handler and associated
equipment, and boiler and associated equipment are over 20
years old, which is the typical expected effective life span of
HVAC equipment. The equipment and methods of operation
are out of date and can be replaced with units that will provide
better, more reliable performance and allow more flexibility and
accuracy in control. That being stated, these
recommendations have not been considered for the scope of
this audit since replacing these systems will not have any
payback. These changes are recommended for continued
building performance and not operational efficiency. The
equipment is functioning at a high enough level that no
changes to the efficiency of the system will realize a significant
payback. It is also a relatively small school with a simple
HVAC system so little can be done to adjust and improve what
exists.
8. Interactive Effects of Projects: The AkWarm$C program calculates
savings assuming that all recommended EEM are implemented. If
some EEMs are not implemented, savings for the remaining EEMs will
be affected, in some cases positively, and in others, negatively. For
example, if the fan motors are not replaced with premium efficiency
motors, then the savings for the project to install variable speed drives
(VFDs) on the fans will be increased.
In general, all projects were evaluated sequentially so that energy
savings associated with one EEM would not be attributed to another
EEM as well. For example, the night setback EEM was analyzed
using the fan and heating load profile that will be achieved after
installation of the VFD project is completed. By modeling the
recommended projects sequentially, the analysis accounts for
interactive effects between the EEMs and does not “double count”
savings.
Interior lighting, plug loads, facility equipment, and occupants
generate heat within the building. When the building is in cooling
mode, these contribute to the overall cooling demands of the
Unalakleet Elementary School Comprehensive Energy Audit
22
building; therefore lighting efficiency improvements will reduce
cooling requirements on air conditioned buildings. Conversely,
lighting efficiency improvements are anticipated to increase heating
requirements slightly. Heating penalties are included in the lighting
project analysis that is performed by AkWarm$C.
9. Loan Program: The Alaska Housing Finance Corporation (AHFC)
Alaska Energy Efficiency Revolving Loan Fund (AEERLF) is a State of
Alaska program enacted by the Alaska Sustainable Energy Act
(senate Bill 220, A.S. 18.56.855, “Energy Efficiency Revolving Loan
Fund). The AEERLF will provide loans for energy efficiency retrofits
to public facilities via the Retrofit Energy Assessment for Loan System
(REAL). As defined in 15 AAC 155.605, the program may finance
energy efficiency improvements to buildings owned by:
a. Regional educational attendance areas;
b. Municipal governments, including political subdivisions of
municipal governments;
c. The University of Alaska;
d. Political subdivisions of the State of Alaska, or
e. The State of Alaska
Native corporations, tribal entities, and subsidiaries of the federal
government are not eligible for loans under this program.
Unalakleet Elementary School Comprehensive Energy Audit
23
Appendix A: Photos
Library, East Entrance (Original School), Restrooms (Addition)
Library (Original School), ADA ramp for Elem. and High Schools
Unalakleet Elementary School Comprehensive Energy Audit
24
Classrooms, Southeast Elevation (Addition), Playground beyond
Northeast Entrance (Addition)
Unalakleet Elementary School Comprehensive Energy Audit
25
Classrooms, Northwest Elevation (Addition)
Multi!Purpose Room, North Elevation (Original School)
Unalakleet Elementary School Comprehensive Energy Audit
26
Multi!Purpose Rm., Kitchen, Classrooms, West Elev. (Orig. School)
Kitchen exhaust fans, make!up air unit intake hood (Original School)
Unalakleet Elementary School Comprehensive Energy Audit
27
Classrooms, Kindergarten Classroom building beyond, West
Elevation (Original School)
Kindergarten Classroom building, South Elevation (Original School)
Unalakleet Elementary School Comprehensive Energy Audit
28
Kindergarten Classroom building, Southeast Elev. (Original School)
Transition point between Elementary School and High School, South
Elevation
Unalakleet Elementary School Comprehensive Energy Audit
29
Typical Classroom (Original School)
Typical Classroom (Addition)
Unalakleet Elementary School Comprehensive Energy Audit
30
Main Hallway (Original School)
Main Hallway (Addition)
Unalakleet Elementary School Comprehensive Energy Audit
31
Multipurpose Room
Unalakleet Elementary School Comprehensive Energy Audit
32
Kitchen cooking equipment under exhaust hood
Kitchen dish washing equipment
Unalakleet Elementary School Comprehensive Energy Audit
33
Basement walk in refrigerators and freezer (Refrigerator on left,
Refrigerator/Freezer on right)
Basement walk in Refrigerator/Freezer
Unalakleet Elementary School Comprehensive Energy Audit
34
Air Handler (V!1), serves Multipurpose Room and Addition
Air side Heat Exchanger (V!3), typical of two
Unalakleet Elementary School Comprehensive Energy Audit
35
V!1 and V!3 Controls
Oil fired boilers, domestic hot water storage tank, domestic hot water
heat exchanger (blue, bottom right), fuel oil day tank in background
Unalakleet Elementary School Comprehensive Energy Audit
36
Typical Heating Circulators (H!9, H!10)
Waste Heat Exchanger connected to UVEC electrical utility
Unalakleet Elementary School Comprehensive Energy Audit
37
Appendix B: AK Warm Energy Model
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Unalakleet Elementary
Page 1
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 3/15/2012 6:57 PM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Unalakleet Elementary Auditor Company: RSA Engineering, Inc.
Address: Unalakleet Alaska 99684 Auditor Name: Adam Wilson
City: Unalakleet Auditor Address: 2522 Arctic Blvd
Suite 200
Anchorage, AK 99503
Client Name: Richard Ried
Client Address: PO box 225
Unalakleet Alaska 99684
Auditor Phone: (907) 276-0521
Auditor FAX:
Client Phone: (907) 624-4250 Auditor Comment:
Client FAX:
Design Data
Building Area: 26,513 square feet Design Heating Load: Design Loss at Space: 1,300,263
Btu/hour
with Distribution Losses: 1,300,263 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency and
25% Safety Margin: 1,982,108 Btu/hour
Note: Additional Capacity should be added for DHW load,
if served.
Typical Occupancy: 174 people Design Indoor Temperature: 70 deg F (building average)
Actual City: Unalakleet Design Outdoor Temperature: -34 deg F
Weather/Fuel City: Unalakleet Heating Degree Days: 13,919 deg F-days
Utility Information
Electric Utility: Unalakleet Valley Electric Assoc -
Commercial - Lg
Natural Gas Provider: None
Average Annual Cost/kWh: $0.407/kWh Average Annual Cost/ccf: $0.000/ccf
Annual Energy Cost Estimate
Description Space
Heating
Space
Cooling
Water
Heating Lighting Refrige
ration
Other
Electric
al
Cooking Clothes
Drying
Ventilatio
n Fans
Service
Fees Total Cost
Existing
Building
$108,64
3
$0 $2,959 $22,317 $16,22
9
$64,13
4
$8,588 $0 $2,223 $48 $225,140
With
Proposed
Retrofits
$94,694 $0 $2,909 $16,451 $12,35
0
$64,13
4
$8,588 $0 $2,052 $48 $201,226
SAVINGS $13,949 $0 $50 $5,866 $3,879 $0 $0 $0 $171 $0 $23,914
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Unalakleet Elementary
Page 2
$0
$50,000
$100,000
$150,000
$200,000
$250,000
Existing Retrofit
Service Fees
Ventilation and Fans
Space Heating
Refrigeration
Other Electrical
Lighting
Domestic Hot Water
Cooking
Annual Energy Costs by End Use
$0
$50,000
$100,000
$150,000
$200,000
$250,000
Existing Retrofit
Hot Wtr District Ht
#2 Oil
Electricity
Annual Energy Costs by Fuel
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Unalakleet Elementary
Page 3
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Refrigeration: Walk
in Freezer
Add new Seasonal
Shutdown
$1,622 $1 9873.13 0
2 Refrigeration: True
Mfg. model T-49
Add new Seasonal
Shutdown
$517 $1 3148.13 0
3 Refrigeration:
Beverage-Air KR 48-
1AS
Add new Seasonal
Shutdown
$398 $1 2421.50 0
4 Refrigeration: Walk
In Refrigerator
Add new Seasonal
Shutdown
$324 $1 1974.00 0
5 Refrigeration: GE
Mo. FCM 25DAB WH
Add new Seasonal
Shutdown
$148 $1 900.88 0
6 Refrigeration: Haier
Mo. HTQ21JABWW-
02
Add new Seasonal
Shutdown
$81 $1 493.63 0
7 Lighting: MPR T-12
Single Lamp,
Perimeter
Remove Manual Switching
and Add new Occupancy
Sensor
$35 $1 211.13 0
8 Lighting: MPR T-12
Single Lamp, Core
Remove Manual Switching
and Add new Occupancy
Sensor
$22 $1 134.75 0
9 Setback Thermostat:
125 - Kindergarten
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 125 - Kindergarten
space.
$1,529 $200 103.72 0.1
10 Setback Thermostat:
115 - Multi-Purpose
Room
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 115 - Multi-Purpose
Room space.
$1,395 $200 94.62 0.1
11 Setback Thermostat:
106 - Classroom 6th
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 106 - Classroom 6th
space.
$1,038 $200 70.39 0.2
12 Setback Thermostat:
105 - Classroom 5th
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 105 - Classroom 5th
space.
$1,035 $200 70.18 0.2
13 Setback Thermostat:
134 - Elementary
Resource
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 134 - Elementary
Resource space.
$895 $200 60.70 0.2
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Unalakleet Elementary
Page 4
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
14 Setback Thermostat:
126 -
Bilingual/Bicultural
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 126 -
Bilingual/Bicultural space.
$789 $200 53.49 0.3
15 Setback Thermostat:
101 - Classroom 1st
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 101 - Classroom 1st
space.
$752 $200 51.01 0.3
16 Setback Thermostat:
102 - Classroom 2nd
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 102 - Classroom 2nd
space.
$745 $200 50.56 0.3
17 Setback Thermostat:
104 - Classroom 4th
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 104 - Classroom 4th
space.
$739 $200 50.16 0.3
18 Setback Thermostat:
103 - Classroom 3rd
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 103 - Classroom 3rd
space.
$738 $200 50.03 0.3
19 Setback Thermostat:
130 - Teachers Work
Room
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 130 - Teachers Work
Room space.
$643 $200 43.64 0.3
20 Setback Thermostat:
129A - Assistant
Principal
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 129A - Assistant
Principal space.
$263 $200 17.87 0.8
21 Setback Thermostat:
125E - Corridor
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 125E - Corridor space.
$256 $200 17.33 0.8
22 Setback Thermostat:
134A - Elem.
Recource Office
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 134A - Elem. Recource
Office space.
$179 $200 12.13 1.1
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Unalakleet Elementary
Page 5
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
23 Lighting:
Kindergarten T-8 2-
Lamp, Perimeter
Remove Manual Switching
and Add new Occupancy
Sensor
$329 $200 10.02 0.6
24 Lighting: Classrooms,
Offices, Hallways T-8
3-Lamp, Core
Remove Manual Switching
and Add new Occupancy
Sensor
$2,375 $2,600 5.65 1.1
25 Setback Thermostat:
125D - Corridor
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 125D - Corridor space.
$83 $200 5.64 2.4
26 Lighting: Classrooms,
Offices, Hallways T-8
3-Lamp, Perimeter
Remove Manual Switching
and Add new Occupancy
Sensor
$999 $1,400 4.35 1.4
27 Lighting: Library T-8
2-Lamp, Perimeter
Remove Manual Switching
and Add new Occupancy
Sensor
$228 $400 3.47 1.8
28 Lighting: MPR T-8
Single Lamp, Core
Remove Manual Switching
and Add new Occupancy
Sensor
$101 $200 3.12 2
29 Lighting: Restrooms
T-8 2-Lamp, Core
Remove Manual Switching
and Add new Occupancy
Sensor
$91 $200 2.82 2.2
30 Lighting: MPR T-8 2-
Lamp, Core
Remove Manual Switching
and Add new Occupancy
Sensor
$91 $200 2.82 2.2
31 Lighting: Library T-8
2-Lamp, Core
Remove Manual Switching
and Add new Occupancy
Sensor
$171 $400 2.64 2.3
32 Lighting: Restrooms
T-8 2-Lamp,
Perimeter
Remove Manual Switching
and Add new Occupancy
Sensor
$73 $200 2.22 2.7
33 Lighting: MPR T-8
Single Lamp,
Perimeter
Remove Manual Switching
and Add new Occupancy
Sensor
$71 $200 2.17 2.8
34 HVAC And DHW Change heat loop circ.
pumps to VFD, run
domestic hot water recirc.
pump on time clock or
temp. sensor
$3,068 $20,000 2.13 6.5
35 Ventilation CO2 sensor, toilet exhaust
fans on occupancy sensors.
$1,280 $10,000 1.71 7.8
36 Lighting: MPR T-8 2-
Lamp, Perimeter
Remove Manual Switching
and Add new Occupancy
Sensor
$55 $200 1.67 3.7
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Unalakleet Elementary
Page 6
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
37 Lighting:
Kindergarten
Restroom CFL,
Perimeter
Remove Manual Switching
and Add new Occupancy
Sensor
$53 $200 1.62 3.8
38 Lighting: MPR T-12
Single Lamp, Core
Replace with 2 FLUOR T8
4' F32T8 32W Standard
Instant StdElectronic
$30 $400 0.46 13.5
39 Lighting: Restrooms
T-8 Single Lamp,
Core
Remove Manual Switching
and Add new Occupancy
Sensor
$36 $600 0.37 16.8
40 Lighting: Exterior
HPS Wall Packs
Replace with 10 LED 20W
Module StdElectronic
$591 $10,000 0.37 16.9
41 Lighting: MPR T-12
Single Lamp,
Perimeter
Replace with 4 FLUOR T8
4' F32T8 32W Standard
Instant StdElectronic
$48 $800 0.36 16.8
TOTAL $23,914 $51,208 5.12 2.1
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
Exterior Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
Air Leakage
Rank Location Estimated Air Leakage Recommended Air Leakage
Target
Installed
Cost
Annual
Energy
Savings
2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Unalakleet Elementary
Page 7
34 Change heat loop circ. pumps to VFD, run domestic hot water recirc. pump on time
clock or temp. sensor
$20,000 $3,068
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
9 125 - Kindergarten Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 125 - Kindergarten
space.
$200 $1,529
10 115 - Multi-
Purpose Room
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 115 - Multi-Purpose
Room space.
$200 $1,395
11 106 - Classroom
6th
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 106 - Classroom 6th
space.
$200 $1,038
12 105 - Classroom
5th
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 105 - Classroom 5th
space.
$200 $1,035
13 134 - Elementary
Resource
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 134 - Elementary
Resource space.
$200 $895
14 126 -
Bilingual/Bicultural
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 126 -
Bilingual/Bicultural space.
$200 $789
15 101 - Classroom 1st Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 101 - Classroom 1st
space.
$200 $752
16 102 - Classroom
2nd
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 102 - Classroom 2nd
space.
$200 $745
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Unalakleet Elementary
Page 8
17 104 - Classroom
4th
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 104 - Classroom 4th
space.
$200 $739
18 103 - Classroom
3rd
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 103 - Classroom 3rd
space.
$200 $738
19 130 - Teachers
Work Room
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 130 - Teachers Work
Room space.
$200 $643
20 129A - Assistant
Principal
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 129A - Assistant
Principal space.
$200 $263
21 125E - Corridor Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 125E - Corridor space.
$200 $256
22 134A - Elem.
Recource Office
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 134A - Elem. Recource
Office space.
$200 $179
25 125D - Corridor Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 125D - Corridor space.
$200 $83
Ventilation
Rank Recommendation Cost Annual
Energy
Savings
35 CO2 sensor, toilet exhaust fans on occupancy sensors. $10,000 $1,280
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
7 MPR T-12 Single
Lamp, Perimeter
4 FLUOR T12 4' F40T12 40W
Standard Magnetic with
Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$1 $35
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Unalakleet Elementary
Page 9
8 MPR T-12 Single
Lamp, Core
2 FLUOR T12 4' F40T12 40W
Standard Magnetic with
Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$1 $22
23 Kindergarten T-8 2-
Lamp, Perimeter
36 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$200 $329
24 Classrooms,
Offices, Hallways T-
8 3-Lamp, Core
141 FLUOR (3) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$2,600 $2,375
26 Classrooms,
Offices, Hallways T-
8 3-Lamp,
Perimeter
74 FLUOR (3) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$1,400 $999
27 Library T-8 2-Lamp,
Perimeter
25 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$400 $228
28 MPR T-8 Single
Lamp, Core
17 FLUOR T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$200 $101
29 Restrooms T-8 2-
Lamp, Core
4 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$200 $91
30 MPR T-8 2-Lamp,
Core
8 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$200 $91
31 Library T-8 2-Lamp,
Core
15 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$400 $171
32 Restrooms T-8 2-
Lamp, Perimeter
4 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$200 $73
33 MPR T-8 Single
Lamp, Perimeter
15 FLUOR T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$200 $71
36 MPR T-8 2-Lamp,
Perimeter
6 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$200 $55
37 Kindergarten
Restroom CFL,
Perimeter
FLUOR (4) CFL, Spiral 42 W with
Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$200 $53
38 MPR T-12 Single
Lamp, Core
2 FLUOR T12 4' F40T12 40W
Standard Magnetic with
Manual Switching
Replace with 2 FLUOR T8 4'
F32T8 32W Standard
Instant StdElectronic
$400 $30
39 Restrooms T-8
Single Lamp, Core
3 FLUOR T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$600 $36
40 Exterior HPS Wall
Packs
10 HPS 50 Watt StdElectronic
with Daylight Sensor
Replace with 10 LED 20W
Module StdElectronic
$10,000 $591
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Unalakleet Elementary
Page 10
41 MPR T-12 Single
Lamp, Perimeter
4 FLUOR T12 4' F40T12 40W
Standard Magnetic with
Manual Switching
Replace with 4 FLUOR T8 4'
F32T8 32W Standard
Instant StdElectronic
$800 $48
Refrigeration
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
1 Walk in Freezer 2 Walk in Freezer Add new Seasonal
Shutdown
$1 $1,622
2 True Mfg. model T-
49
Commercial Refrigerator Add new Seasonal
Shutdown
$1 $517
3 Beverage-Air KR
48-1AS
Commercial Refrigerator Add new Seasonal
Shutdown
$1 $398
4 Walk In
Refrigerator
Walk In Refrigerator Add new Seasonal
Shutdown
$1 $324
5 GE Mo. FCM
25DAB WH
Chest Freezer Add new Seasonal
Shutdown
$1 $148
6 Haier Mo.
HTQ21JABWW-02
2 Refrigerator w/ Freezer on
top
Add new Seasonal
Shutdown
$1 $81
Other Electrical Equipment
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
Cooking/Clothes Drying
Rank Recommended Installed
Cost
Annual
Energy
Savings
------------------------------------------
AkWarmCalc Ver 2.1.4.2, Energy Lib 3/1/2012
Unalakleet Elementary School Comprehensive Energy Audit
48
Appendix C: Existing Plans