HomeMy WebLinkAboutBSSD-UNK-RSA BBSD Office 2012-EERichard S. Armstrong, PE, LLC
Mechanical/Electrical Engineer
Comprehensive Energy Audit
of
Bering Strait School District Office
Unalakleet, Alaska
Project # BSSD"UNK"RSA"02
Prepared for:
Bering Strait School District
Contact: Richard Ried, Maintenance Supervisor
Phone: 907"624"4249
Unalakleet, Alaska
April 9, 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
Bering Strait School District Office 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 9
5. Building Description & Function 10
6. Historic Energy Consumption 14
7. Energy Efficiency Measures Considered or Recommended 14
8. Interactive Effects of Projects 21
9. Loan Program 21
Appendix A: Photos 23
Appendix B: AkWarm"C Report 36
Appendix C: Building Schedules and Plans 51
Performed by: ___________________________
Adam W. Wilson, PE, CEA
CEA # 1618
RSA Engineering, Inc.
Reviewed by: ___________________________
Richard Armstrong, PE, CEM
CEA #178, CEM # 13557
Bering Strait School District Office 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.
Bering Strait School District Office Comprehensive Energy Audit
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Investment Grade Energy Audit
Bering Strait School District Office
2. Executive Summary:
The Bering Strait School District Office (DO) was constructed in
1981. 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:
Table 1
2009 2009 2010 2010
Utility Consumption Cost/Year Consumption Cost/Year
Electricity$kWh 151,680 $ 66,690 155,520 $ 57,190
No. 2 Fuel Oil $
Gallons
11,305 $ 42,572 10,935 $ 35,296
Total Energy Costs $109,262 $ 92,486
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:
Table 2
Bering Strait
School District
Office
Unalakleet
Elementary &
High Schools
Average for
All BSSD
Schools
Energy Use Index (EUI)
kBTU/SF Avg 2009, 2010
113.6 106.2 125.3
Energy Cost Index (ECI)
Average 2009, 2010
$5.75 $4.84 $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
Bering Strait School District Office Comprehensive Energy Audit
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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. Building HVAC Controls
i. The building heating, ventilation and air conditioning
(HVAC) system is currently served by pneumatic
controls. It is recommended that the pneumatic
control system be replaced with an electronic control
system. This will allow greater control of the HVAC
systems and reduce the amount of maintenance costs
associated with pneumatic controls, while keeping the
controls relatively simple for maintenance personnel
to work with.
ii. Upgrading controls would overlap with other
recommended work described below so it is difficult to
identify the savings and payback of this upgrade
alone. However it is safe to assume that most of the
energy savings for the project will be due to controls
upgrades. An estimate of $150,000 would be
reasonable, with a savings of about 30% and a pay
back of approximately 6.5 years.
b. Air Handler Controls
i. Outside Air Intake: Maintain minimum outside air
settings on air handlers during building occupancy. It
is assumed that the pneumatic control system is not
providing tight enough control of damper settings so
additional outside air may be entering the building
increasing the building heat load.
ii. Schedules: The time clock that operates the main air
handler, AC$1, is set for 12$hour operation during
week days. The building is only occupied for 8 to 10$
hours a day so the scheduled should be updated.
iii. Carbon Dioxide (CO2) Monitoring: CO2 sensors can
be utilized to help reduce the amount of outside air
Bering Strait School District Office Comprehensive Energy Audit
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drawn into the building. Rather than supply a set
minimum amount of outside air during air handler
operation (20% of total 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 offices. This often results in less outside air
being drawn into the building, which reduces the
amount of energy needed to heat the air.
iv. The above changes to air handler control will provide
an estimated 10$15% annual energy savings with an
expected payback of approximately 2 years.
c. Pumps
i. The main constant volume heating circulation pumps
for the building can be changed out for variable speed
drive (VFD) pumps. VFD pumps can run at lower
speeds when the building has a low heating demand,
which will save power and reduce operating costs.
The main circulation pumps can also be turned off
when there is no call for heating, rather than run
continuously as they currently do.
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 2% energy
savings for the building with a payback of about 9.3
years.
d. Reduce Thermostat Set Points: It is recommended that the
daytime space temperatures for most spaces be set no
higher than 72 degrees F and that the nighttime set point be
set to 60 degrees F. The lower nighttime setback will save
approximately $5,578 per year with a payback of about 3
years.
e. Occupancy Sensors for Lighting: The restrooms and
mechanical/electrical room are the only spaces currently
equipped with occupancy sensors for lighting. Most of the
other spaces in the building can be provided with
occupancy sensors as well. The annual energy savings will
be about 3% with a payback of approximately 1.4 years.
Bering Strait School District Office Comprehensive Energy Audit
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f. Upgrade Exterior Lighting: There are 9 exterior wall
mounted light fixtures and two street$light style that use high
pressure sodium (HPS) lamps and only operate during dark
times of the year. It is recommended that the fixtures be
replaced with light emitting diode (LED) fixtures. If the
fixtures are replaced the energy savings will be
approximately 2% and have a payback of about 5 years.
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. Use infrared automatic lavatory faucets and water closet
flush valves in all restrooms.
2. If automatic flushing is not desired then install water closet
flushometer valves for dual level flushing.
3. Turn off computers, monitors, printers, faxes, coffee
makers, etc when leaving the office for the day. Turn off
computers, monitors, printers, faxes, coffee makers, etc.,
when leaving for the day. These devices can also be
plugged into power strips equipped with occupancy sensors
so they will automatically turn off when the building is not in
use.
4. Provide occupancy sensors for unoccupied spaces such as
storage rooms 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.
The priority recommendations in the detailed report are estimated to
save $38,129/year, with an installed cost of $212,704, for a 5.6 year
payback. This does not include design or CA services, but overall it
does indicate a cost effective energy savings program.
Bering Strait School District Office Comprehensive Energy Audit
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3. Audit and Analysis Background:
a. Program Description: This audit included services to identify,
develop, and evaluate energy efficiency measures at the
subject building. The scope of this project included evaluating
the building shell, lighting, other electrical systems, and
heating, ventilating, and air conditioning (HVAC) equipment.
Measures were selected such that an overall simple payback
period of 8 years or less could be achieved.
b. Audit Description and Methodology: Preliminary audit
information was gathered in preparation for the site survey,
including benchmark utility consumption data, floor and lighting
plans, and equipment schedules where available. A site visit
was performed to inventory and evaluate the actual building
condition, including:
i. Building envelope (roof, windows, etc)
ii. Heating, ventilating, and air conditioning
iii. Lighting systems and controls
iv. Building specific equipment
v. Plumbing systems
c. Method of Analysis: The information gathered prior to the site
visit and at the site visit is entered into AkWarm$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
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$front investment required to
Bering Strait School District Office Comprehensive Energy Audit
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implement a change, but design and construction management
costs are excluded. Costs are derived from Means Cost Data,
industry publications, experience of the auditor, local
contractors and equipment suppliers. Maintenance savings
are calculated were applicable and are added to the energy
savings for each EEM.
The cost and savings are applied and a simple payback and
simple return on investment (ROI) is calculated. The simple
payback is based on the number of years that it takes for the
savings to pay back the net installation cost (Net Installation
divided by Net Savings.)
A simple life$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.
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
Bering Strait School District Office Comprehensive Energy Audit
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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
performed some of the audits to assure current knowledge of
existing conditions.
5. Building Description and Function: The subject structure is the
Bering Strait School District Office (DO) and was constructed in 1981.
It is the administrative headquarters for the Bering Strait School
District (BSSD). The building is about 75% office space (including
spaces that support office activities such as the copy room) and 15%
Bering Strait School District Office Comprehensive Energy Audit
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maintenance work area and 10% utility and storage space. The
building is a two story structure with a pile foundation that is enclosed
with skirting around the whole building. The first floor is made up of
offices and maintenance spaces. Most of the office spaces are large
rooms with multiple occupants. There are a few smaller offices with
single occupants. The office ceilings are 8$1/2 feet high and are
suspended acoustical tile. The maintenance area has areas for parts
storage, computer equipment maintenance, and limited space for
small scale maintenance work. The ceiling is hard lid and is fastened
to the bottom of the second floor structure. The main mechanical and
electrical equipment room is on the first floor in the maintenance area.
The walls and ceilings are covered with acoustic insulation. The
ceiling is hard lid ad is fastened to the second floor structure. There
are two stairways in the building, one in the front and one in the back.
There is also a hydraulic elevator between the two floors. The second
floor is used almost entirely as office space with a few storage rooms
throughout. Some of the offices are large with multiple occupants.
There are a few smaller offices with single occupants. The office
ceilings are 8$1/2 feet high and are suspended acoustical tile. There
are also two restrooms on both floors, one each for men and women.
The building roof is 2x12 construction, boards 16” on center, with R$30
batt insulation installed between. Another layer of 1$1/2” polystyrene
insulation is sandwiched between plywood boards on top of the
2x12’s. The total roof insulation value is approximately R$38. Exterior
walls are 2x4 construction, with R$13 batt insulation, in most places
but some are 2x6, presumably with R$21 insulation (the plans to not
specify) to serve as shear walls. Both are 12” on center. The exterior
side of the walls also has 1$1/2” polystyrene insulation. The 2x4 and
2x6 walls are approximately R$20 and R$26 respectively. The bottom
floor is constructed of 2x10 and 2x12 boards with R$30 between and
2” polystyrene insulation below. The total floor insulation value is
about R$38. In 2009 the siding on the building exterior was replaced
to match the elementary and high schools. It is assumed that any
deficiencies that were observed in the underlying building envelope
were corrected at that time. The building is in very good condition
overall and appears to operate more or less as designed. The
building is occupied from the beginning of August through the middle
of June. The building is lightly used during the summer months.
Bering Strait School District Office Comprehensive Energy Audit
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a. Heating System: The heating plant is in the mechanical and
electrical room on the first floor. The building heating system
consists of two Weil$McLain WGO$8 cast iron sectional boilers
with Becket model F35A08C63 burners. The boilers provide
heat to the school and office building only. The boilers are
relatively new appearing to have been installed in the last 5 or
so years. Each boiler is served by a small circulator, a
Grundfos model UPS15$58FC. Hot glycol is circulated around
the building using two Bell and Gossett model 1510$11/2AB
base mounted pumps, each with a 3/4 HP motor. The exact
method of control for the pumps is unclear but it is assumed
that both operate constantly during the heating season. The
pumps are not equipped with variable frequency drives (VFD)
so they run at full speed when they operate. Heat is distributed
throughout the building using fintube baseboard in most
perimeter and some interior spaces, cabinet unit heaters at the
entry ways, unit heaters in utility spaces, an air handler in the
maintenance are, and some supplemental heat through
tempered ventilation air. The heating units throughout the
building have been provided with electric thermostats and zone
valves to replace the pneumatic controls that were failing. The
new thermostats are non$programmable.
b. Ventilation System: There are two air handlers in the building.
AC$1 is the air handler that serves the administrative spaces in
the building. It was designed to provide cooling and heating at
an airflow of 10,240 CFM. The original plans show a complex
ventilation system that includes mechanical cooling and
heating, a heat recovery coil, and return and relief fans. From
conversations with maintenance personnel on site, and
observation of the system, it does not appear that the system
is functioning as intended. A combination of failed equipment,
HVAC modifications over time, and unfamiliarity with
controlling the system have affected performance. At the very
least it appears that AC$1 is providing some level of ventilation
air, though the exact amount is unknown. AC$1 operates on a
time clock from 6:00 A.M. to 6:00 P.M. on weekdays. The
original plans indicate that there was a condensing unit
installed in the mechanical/electrical room to serve the cooling
Bering Strait School District Office Comprehensive Energy Audit
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coil in AC$1. The condensing unit was demolished at some
point and the cooling coil has been abandoned in place inside
AC$1. The air terminal devices are slot diffusers that were
originally designed to vary the amount of supply air using
modulating dampers controlled by the pneumatic system. The
diffuser pneumatics have been disconnected in the
mechanical/electrical room and the diffuser dampers are static.
The maintenance area has an air handler, AH$1, that is used
primarily for heating. It does not appear that it is used regularly
for ventilation and it is questionable whether the pneumatic
actuators are still operational. The unit is controlled using a
wall mounted heating thermostat. The building restrooms are
served by a single exhaust fan located in the
mechanical/electrical room. Heating of ventilation (outside) air
is a significant source of energy consumption for commercial
buildings.
c. Plumbing System: Water is provided from the village utility
and there is not any on$site storage. Fixtures include water
closets, lavatories, showers (do not appear to be used), break
room sink, mop sinks and a service sink in the maintenance
area.
d. Domestic Hot Water: How water is generated by an oil$fired
water heater in the mechanical/electrical room. It is 32 gallons
and is equipped with a recirculation pump that operates
continuously. No additional hot water storage is provided.
e. Lighting: Lighting is provided throughout occupied spaces in
the building using T$8 fluorescent fixtures with electronic
ballasts that are controlled with wall mounted toggle switches.
Occupancy sensors are installed in the restrooms and the
mechanical/electrical room. Exterior lights are high pressure
sodium (HPS) fixtures and include wall packs (95 and 135
watts) and pole mounted street light (135 watts) fixtures.
Exterior lights operate using a time clock in the
mechanical/electrical room.
Bering Strait School District Office Comprehensive Energy Audit
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f. Fire Sprinkler: The building is equipped with a fire sprinkler
protection system throughout. Fire sprinkler water is supplied
from the village water utility.
6. Historic Energy Consumption: Energy consumption is modeled
within the AkWarm$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.
Based on the benchmark energy data for 2009 and 2010, the average
electric consumption for the building was 153,600 kWh/year at an
average cost of $61,940/year. The average fuel oil consumption was
11,120 gallons/year, at an average annual cost of $38,934/year.
7. Energy Efficiency Measures Considered or Recommended: The
building was examined for application of a multitude of potential EEMs
that are discussed below. Those EEMs that appear to have an
application for the subject building are further analyzed for estimated
payback periods, either within the AkWarm$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. HVAC Control: The building HVAC system is operated using
pneumatic controls. This method of control utilizes air in
pressurized tubing to monitor environmental conditions and
actuate equipment. The power behind the system is an air
compressor that operates as needed to maintain pressure in
the tubing. By its very nature a pneumatic control system has
inherent inefficiencies, namely the need to continually re$
pressurize the system. As sensors and actuators operate they
release air from the pressurized tubing, which is how they are
Bering Strait School District Office Comprehensive Energy Audit
15
designed to work. Loose fittings, damaged pipe, broken
equipment all contribute to air escaping from the system. As a
result the air compressor will operate intermittently throughout
the life of the system. As the system’s integrity degrades over
time more air leaks occur and the compressor operates more
frequently. Failures in the system often lead to equipment
failing in one position, affecting the performance of the
equipment and possibly increasing energy use. This is likely
the case with the building HVAC system. Pneumatic control
systems require a level of training to operate and maintain that
is difficult to provide to onsite personnel given the remote
nature of the location and frequent and/or sudden turn over of
maintenance staff. The remote location also makes it costly to
hire contractors to come and maintain and/or repair the
pneumatic control system. For these reasons it is
recommended that the pneumatic control system be
demolished and an electronic control system be installed. This
will require the installation of new thermostats and sensors,
actuators, valve motors, control panel(s) and low (24) voltage
wiring throughout the building. Most of the wiring can be
installed above suspended ceilings making for a simpler
installation and cleaner appearance. Pneumatic equipment
that is being replaced will need to be removed. Items such as
tubing and fittings that are out of site and not conflicting with
new equipment can be abandoned in place.
b. Ventilation Control: The building ventilation system needs a
thorough investigation to determine the current functionality of
all equipment and to decide whether changes could be made
to improve the overall effectiveness and efficiency of the
system. When the AkWarm$C energy model for the building
was first analyzed it showed that the building should be
consuming much less heating energy that it is actually using.
This could be due to a building envelope that is less insulated
than designed, or high rates of outside air intake and
infiltration. Given that the building siding was replaced in 2009
it is assumed that deficiencies to the exterior envelope were
identified and addressed at that time. To make the model
match actual fuel use the amount of outside air intake at the air
Bering Strait School District Office Comprehensive Energy Audit
16
handler and the infiltration rate were both increased. If this is
the real condition it indicates that the air handler is bringing in
too much outside air and/or other fans, such as relief and
exhaust fans, are creating a negative pressure in the building.
It may also indicate that fans are operating outside of occupied
hours. Providing new controls would make it possible to
operate equipment based on known or variable occupancy
schedules, and allow monitoring of set points so the actual
system performance would be known and could be adjusted.
Bering this in mind the following recommendations are offered.
i. VFD Fan Motors: The building relief and/or exhaust
fan(s) can be provided with VFD motors so their speeds
can be adjusted based on the measured amount of
outside air supplied to the building or building pressure.
ii. Operation Schedule: As mentioned previously AC$1
appears to be operating from 6:00 A.M.to 6:00 P.M.
weekdays. The actual building occupancy is closer to
8:00 A.M. – 5:00 P.M. so the schedule should be
reprogrammed. Any equipment that is designed to work
in conjunction with AC$1 should have its schedule
adjusted accordingly if applicable.
iii. Carbon Dioxide (CO2) Monitoring: The amount of CO2
in a building has been shown to have a direct effect on
the performance of the occupants in the building. High
levels of CO2 cause occupants to feel sleepy and lose
concentration. It is also an indication that other indoor
contaminants, such as volatile organic compounds
(VOCs), odors and excessive humidity are likely
increasing in concentration. For these reasons
ventilation air is required by code to refresh indoor
building air. Typically the ventilation rate is determined
based on the number of occupants and space sizes. In
many cases this over$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 the air handlers and
Bering Strait School District Office Comprehensive Energy Audit
17
the air handler outside air dampers can be modulated to
increase or decrease the outside air delivered to the
building. This modification applies to AC$1 and AH$1.
iv. AC"1 cooling coil: Since the coil is no longer in use it is
recommended that the coil be removed from the unit to
reduce the amount of static pressure in the system,
which will reduce the load on the supply fan and increase
airflow throughout the facility.
c. Boiler Temperature Outdoor Air Reset: As the outside air
temperature varies building heat loss varies as well, losing
heat at a faster rate as the ambient temperature drops. Boiler
systems are typically sized to meet the heating demands of the
coldest expected temperatures. These extreme temperatures
may only occur for short durations in a given winter and will
vary in frequency and length year to year. Most cast iron
sectional boilers supply heating water at the same temperature
year$round. During periods of warmer weather in the heating
season high heating water supply temperatures may cause
space temperatures to overshoot set points because the hot
boiler water 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 water, 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 water temperature based on
the ambient temperature – increasing the water temperature
when outdoor conditions are cold and decreasing water
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 water temperatures for the hot
water generators), or forgetting to reset the boiler temperature,
it is recommended that a controller be installed that will
Bering Strait School District Office Comprehensive Energy Audit
18
perform the outdoor reset automatically. There is not a
provision for simulating this in the AkWarm$C program so no
energy savings are considered here. However it is
recommended that a licensed professional engineer perform
the design for installation of this controller at which time an
energy savings analysis could be performed.
d. Waste Heat Metering: The building is provided with waste
heat from the local electric utility, which is a major opportunity
to save energy. However there are not any functional metering
devices on the waste heat system to know how much energy
the building is receiving from the utility. In order to understand
current and future energy consumption from waste heat a
British thermal unit (BTU) meter should be installed. All
financed energy upgrade projects require baseline, benchmark
energy consumption data. Without waste heat metering, there
is no baseline to use for savings forecast or back$check. One
example system is a Onicon System 10 BAC$IP BTU meter.
The meter is BACnet/IP compatible. Specify the glycol supply
pipe size and high temperature sensors if the glycol is over 200
deg F. A base price of $1,700 was noted on the
midwestBAS.com website. See
http://www.midwestbas.com/store/SYSTEM$10$
BAC_Onicon.html. 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.
e. Occupancy sensor light controls: Occupancy sensors have
evolved over the years to now be more reliable, and have
Bering Strait School District Office Comprehensive Energy Audit
19
fewer false starts and stops. Dual technology occupancy
sensors combine passive infrared (PIR) and ultrasonic
technologies into one unit to achieve precise coverage and to
eliminate false triggers. The sensors can be mounted on the
wall in place of the existing light switch, or on the ceiling where
more uniform coverage and detection is desired in a larger
room. Wall switch type automatic occupancy sensors are
appropriate for small rooms, such as utility rooms, one person
toilet rooms, small open offices, and places where the wall
switch is located such that occupants can be detected with
line$of$sight from anywhere in the room. They can turn lights
on and off based on both occupancy and ambient light levels.
Devices in break rooms, utility rooms, storage rooms, small
offices, and small open (non$partitioned) bathrooms can save
up to 60% of the cost of the lighting where rooms are
infrequently used, but the lights are typically left on.
f. Exterior Lighting Upgrade: High$intensity discharge (HID)
fixtures, such as high pressure sodium (HPS), 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 a viable alternative to HPS. LED
fixtures use nano reflector technology with drivers offering
50,000 hours life, about 6 years, as compared to only 20,000
hours with high$intensity discharge (HID) fixtures. LED fixtures
offer the instant$on feature of fluorescent fixtures but use
significantly less energy than the HID fixtures. LEDs have an
added benefit of operating more efficiently (using less power)
as the ambient temperature gets colder, and some have been
factory tested to operate down to $40 deg F (actual installations
in Antarctica and Fairbanks indicate they operate at lower
temperatures as well) depending on manufacturer. The
proposed LED fixtures are dark sky compliant, using 100%
cutoff optics to reduce light pollution. 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. The following chart indicates energy
savings for various exterior building mounted light fixtures (MH
Bering Strait School District Office Comprehensive Energy Audit
20
Metal Halide; HSP High Pressure Sodium) using Scotopic
lighting measurements:
HID Lamp HID
System
Wattage
LED
System
Wattage
Energy
Savings
(%)
100W HPS 130W 27W 79
150W HPS 188W 54W 71
g. Fuel Oil Metering: It is recommended that fuel oil meters be
installed to track the amount of fuel used by the boilers and
electric generator. 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. In
order to understand current and future fuel consumption, a fuel
meter should be installed at the fuel supply to the building.
The Pathfinder Instruments FM$200 meter is for fuel pipes
sized ¾” to 1” (different meters, must specify pipe size), and
they cost around $225 each. They operate at a flow range of
4$20 GPM. These are mechanical meters with strainers and 3$
digid display that shows both present fuel use, and cumulative
fuel use. Any ESCO contract, or AHFC financed contract will
require fuel metering to verify paybacks of energy conservation
measures. Electronic turbine meters are also available. See
pathfinderinstruments.com for product information.
h. 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
Bering Strait School District Office Comprehensive Energy Audit
21
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$C program calculates
savings assuming that all recommended EEM are implemented. If
some EEMs are not implemented, savings for the remaining EEMs will
be affected, in some cases positively, and in others, negatively. For
example, if the fan motors are not replaced with premium efficiency
motors, then the savings for the project to install variable speed drives
(VFDs) on the fans will be increased.
In general, all projects were evaluated sequentially so that energy
savings associated with one EEM would not be attributed to another
EEM as well. For example, the night setback EEM was analyzed
using the fan and heating load profile that will be achieved after
installation of the VFD project is completed. By modeling the
recommended projects sequentially, the analysis accounts for
interactive effects between the EEMs and does not “double count”
savings.
Interior lighting, plug loads, facility equipment, and occupants
generate heat within the building. When the building is in cooling
mode, these contribute to the overall cooling demands of the
building; therefore lighting efficiency improvements will reduce
cooling requirements on air conditioned buildings. Conversely,
lighting efficiency improvements are anticipated to increase heating
requirements slightly. Heating penalties are included in the lighting
project analysis that is performed by AkWarm$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
Bering Strait School District Office Comprehensive Energy Audit
22
(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.
Bering Strait School District Office Comprehensive Energy Audit
23
Appendix A: Photos
Main Entrance, South Elevation
East Elevation
Bering Strait School District Office Comprehensive Energy Audit
24
Maintenance Area Entrance, North Elevation
West Elevation
Bering Strait School District Office Comprehensive Energy Audit
25
First Floor Southeast Shared Office
First Floor Southwest Shared Office with File Storage
Bering Strait School District Office Comprehensive Energy Audit
26
Second Floor Hallway
Second Floor Northwest Shared Office (Northeast Office Similar)
Bering Strait School District Office Comprehensive Energy Audit
27
Second Floor Single Office (Typical)
Second Floor Copy Room
Bering Strait School District Office Comprehensive Energy Audit
28
Second Floor Communications Studio
Second Floor Teleconference Room
Bering Strait School District Office Comprehensive Energy Audit
29
Second Floor Conference Room
Second Floor Break Room
Bering Strait School District Office Comprehensive Energy Audit
30
First Floor Maintenance Room, building air handler outside air intake
duct on ceiling
Bering Strait School District Office Comprehensive Energy Audit
31
First Floor IT Work Area, Maintenance Room air handler and waste
heat exchanger in background
Waste heat exchanger behind
laptop
Bering Strait School District Office Comprehensive Energy Audit
32
First Floor Mech./Elec. Room, oil fired boilers and water heater
First Floor Mechanical/Electrical Room, building air handler
Bering Strait School District Office Comprehensive Energy Audit
33
First Floor Mechanical/Electrical Room, main heating circulators
First Floor Mech./Elec. Room, control system air compressor
Bering Strait School District Office Comprehensive Energy Audit
34
First Floor Mechanical/Electrical Room, HVAC control panel
First Floor Mechanical/Electrical Room, time clock controllers for
lighting and headbolt heaters
Bering Strait School District Office Comprehensive Energy Audit
35
New electric analog thermostat (left), abandoned pneumatic sensor
(right), typical throughout building
Bering Strait School District Office Comprehensive Energy Audit
36
Appendix B: AK Warm Energy Model
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 1
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 3/19/2012 6:36 PM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: District Office, BSSD Building Auditor Company: RSA Engineering, Inc.
Address: Unalakleet Alaska 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: 17,559 square feet Design Heating Load: Design Loss at Space: 709,296
Btu/hour
with Distribution Losses: 709,296 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency and
25% Safety Margin: 1,081,244 Btu/hour
Note: Additional Capacity should be added for DHW load,
if served.
Typical Occupancy: 51 people Design Indoor Temperature: 70.5 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
$41,448 $0 $2,081 $28,008 $1,802 $18,05
3
$1,069 $0 $12,018 $48 $104,526
With
Proposed
Retrofits
$12,496 $0 $2,057 $21,488 $1,621 $16,76
6
$1,069 $0 $10,853 $48 $66,398
SAVINGS $28,952 $0 $24 $6,520 $180 $1,288 $0 $0 $1,165 $0 $38,129
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 2
$0
$20,000
$40,000
$60,000
$80,000
$100,000
$120,000
Existing Retrofit
Service Fees
Ventilation and Fans
Space Heating
Refrigeration
Other Electrical
Lighting
Domestic Hot Water
Cooking
Annual Energy Costs by End Use
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 3
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Air Tightening Perform air sealing to
reduce air leakage by 70%.
$7,766 $1 72204.88 0
2 Refrigeration:
Medium
Refrigerator/Freezer
Add new Seasonal
Shutdown
$63 $1 385.50 0
3 Refrigeration: Chest
Freezer
Add new Seasonal
Shutdown
$58 $1 351.69 0
4 Refrigeration: Small
refrigerator
Add new Seasonal
Shutdown
$19 $1 115.63 0.1
5 Setback Thermostat:
Library/Office - 101
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Library/Office - 101
space.
$913 $500 24.76 0.5
6 Setback Thermostat:
Office/Conference -
201
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office/Conference -
201 space.
$457 $500 12.38 1.1
7 Setback Thermostat:
Office - 121
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 121 space.
$368 $500 9.97 1.4
8 Setback Thermostat:
Parts and Storage -
111
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Parts and Storage - 111
space.
$285 $500 7.72 1.8
9 Setback Thermostat:
Corporate Office -
214
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Corporate Office - 214
space.
$282 $500 7.66 1.8
10 Setback Thermostat:
IT Work Area - 111A
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the IT Work Area - 111A
space.
$247 $500 6.70 2
11 Setback Thermostat:
Office - 218
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 218 space.
$242 $500 6.55 2.1
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 4
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
12 Setback Thermostat:
Superintendant
Office - 205
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Superintendant Office
- 205 space.
$221 $500 5.99 2.3
13 Setback Thermostat:
Office - 219
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 219 space.
$190 $500 5.16 2.6
14 Setback Thermostat:
Facilities Director -
115
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Facilities Director - 115
space.
$175 $500 4.73 2.9
15 Setback Thermostat:
Teleconference -
214B
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Teleconference - 214B
space.
$161 $500 4.37 3.1
16 Setback Thermostat:
Office - 114
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 114 space.
$149 $500 4.05 3.3
17 Setback Thermostat:
Maintenance
Supervisor - 111C
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Maintenance
Supervisor - 111C space.
$139 $500 3.76 3.6
18 Setback Thermostat:
Office - 118
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 118 space.
$138 $500 3.74 3.6
19 Setback Thermostat:
Personel Director -
223A
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Personel Director -
223A space.
$135 $500 3.65 3.7
20 Setback Thermostat:
Break Room - 213
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Break Room - 213
space.
$134 $500 3.62 3.7
21 Setback Thermostat:
Office - 203
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 203 space.
$133 $500 3.60 3.8
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 5
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
22 Setback Thermostat:
Office - 222A
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 222A space.
$127 $500 3.43 4
23 Other Electrical:
Ingersol Rand
Century 2
Replace with Air
Compressor Removed
$1,045 $2,000 3.19 1.9
24 Setback Thermostat:
Director - 220
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Director - 220 space.
$112 $500 3.03 4.5
25 Lighting: Office: Type
A - Lithonia
2GPX440A12-120
Core Zone
Remove Manual Switching
and Add new Occupancy
Sensor
$1,050 $2,400 2.71 2.3
26 Lighting: Exterior:
Type L - Holophane
240-CE-120-BLK-TP
Replace with 6 LED 50W
Module StdElectronic
$2,602 $6,000 2.68 2.3
27 Lighting: Exterior
Pole Mount: Type N -
Holophane
CADSQ14J/1A/240H
A-120BLK
Replace with 2 LED 50W
Module StdElectronic
$867 $2,000 2.68 2.3
28 Setback Thermostat:
Stair - 224
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Stair - 224 space.
$96 $500 2.60 5.2
29 Setback Thermostat:
Stair - 124
Implement a Heating
Temperature Unoccupied
Setback to 50.0 deg F for
the Stair - 124 space.
$79 $500 2.15 6.3
30 Setback Thermostat:
Plans Room - 113
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Plans Room - 113
space.
$76 $500 2.07 6.6
31 Setback Thermostat:
Hall - 211
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Hall - 211 space.
$69 $500 1.86 7.3
32 Setback Thermostat:
Reception/Waiting -
122
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Reception/Waiting -
122 space.
$68 $500 1.83 7.4
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 6
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
33 Setback Thermostat:
Men - 108
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Men - 108 space.
$66 $500 1.79 7.6
34 Setback Thermostat:
Women - 105
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Women - 105 space.
$62 $500 1.69 8
35 Setback Thermostat:
Custodial - 209
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Custodial - 209 space.
$59 $500 1.61 8.4
36 Lighting: Hallway,
Mail Room: Type B -
Lithonia
2GPX240A12-120
(changed to 3 lamp
T8's) Core Zone
Remove Manual Switching
and Add new Occupancy
Sensor
$203 $800 1.57 3.9
37 Lighting: Exterior:
Type K Night Light -
Holophane
Replace with 2 LED 25W
Module StdElectronic and
Add new Daylight Sensor
$720 $3,000 1.49 4.2
38 Setback Thermostat:
Maintenance
Secretary - 111B
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Maintenance Secretary
- 111B space.
$53 $500 1.45 9.4
39 Ventilation Use CO2 sensors to
modulate AC-1 and AH-1
outside air. Update all
HVAC equipment to
electronic controls.
$15,275 $150,000 1.37 9.8
40 HVAC And DHW Change heat loop circ.
pumps to VFD, run
domestic hot water recirc.
pump on time clock or
temp. sensor
$2,172 $20,000 1.49 9.2
41 Lighting: Offices,
Hallways: Type A -
Lithonia
2GPX440A12-120
Perimeter Zone
Remove Manual Switching
and Add new Occupancy
Sensor
$553 $2,400 1.42 4.3
42 Lighting:
Maintenance,
Equipment Rooms:
Type C - 8TL240-
120V Core Zone
Remove Manual Switching
and Improve Occupancy
Sensor
$94 $600 0.97 6.4
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 7
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
43 Lighting: Restrooms:
Type E - Keene
CWBX240-DW Core
Zone
Remove Manual Switching
and Add new Occupancy
Sensor
$46 $400 0.71 8.8
44 Setback Thermostat:
Hall - 117
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Hall - 117 space.
$24 $500 0.65 20.7
45 Lighting: Restrooms,
Stiarways: Type E -
Keene CWBX240-DW
Perimeter Zone
Remove Manual Switching
and Add new Occupancy
Sensor
$71 $800 0.55 11.2
46 Lighting: Exterior:
Type L - Holophane
240-CE-120-BLK-TP
Add new Daylight Sensor $237 $3,000 0.49 12.7
47 Lighting: Exterior
Pole Mount: Type N -
Holophane
CADSQ14J/1A/240H
A-120BLK
Add new Daylight Sensor $79 $1,000 0.49 12.7
48 Setback Thermostat:
Women - 207
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Women - 207 space.
$9 $500 0.23 57.7
49 Setback Thermostat:
Men - 210
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Men - 210 space.
$9 $500 0.23 57.7
50 Lighting:
Maintenance,
Equipment Rooms:
Type D - Lithonia L-
240-120V Core Zone
Remove Manual Switching
and Improve Occupancy
Sensor
$14 $600 0.14 43.8
51 Setback Thermostat:
Hall - 103
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Hall - 103 space.
$0 $500 0.00 Infinity
52 Setback Thermostat:
Mail Room - 116
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Mail Room - 116
space.
$0 $500 0.00 Infinity
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 8
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
53 Setback Thermostat:
Food Services
Manager - 120
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Food Services Manager
- 120 space.
$0 $500 0.00 Infinity
54 Setback Thermostat:
Reception - 204
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Reception - 204 space.
$0 $500 0.00 Infinity
55 Lighting: Restroom,
Storage: Type B -
Lithonia
2GPX240A12-120
Perimeter Zone
Improve Occupancy Sensor -$81 $200 -2.50 -2.5
TOTAL $38,129 $212,704 2 5.6
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
1 Air Tightness estimated as:
12000 cfm at 75 Pascals
Perform air sealing to
reduce air leakage by 70%.
$1 $7,766
2. Mechanical Equipment
Mechanical
Rank Recommendation Installed
Cost
Annual
Energy
Savings
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 9
40 Change heat loop circ. pumps to VFD, run domestic hot water recirc. pump on time
clock or temp. sensor
$20,000 $2,172
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
5 Library/Office - 101 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Library/Office - 101
space.
$500 $913
6 Office/Conference
- 201
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office/Conference -
201 space.
$500 $457
7 Office - 121 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 121 space.
$500 $368
8 Parts and Storage -
111
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Parts and Storage - 111
space.
$500 $285
9 Corporate Office -
214
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Corporate Office - 214
space.
$500 $282
10 IT Work Area -
111A
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the IT Work Area - 111A
space.
$500 $247
11 Office - 218 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 218 space.
$500 $242
12 Superintendant
Office - 205
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Superintendant Office -
205 space.
$500 $221
13 Office - 219 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 219 space.
$500 $190
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 10
14 Facilities Director -
115
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Facilities Director - 115
space.
$500 $175
15 Teleconference -
214B
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Teleconference - 214B
space.
$500 $161
16 Office - 114 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 114 space.
$500 $149
17 Maintenance
Supervisor - 111C
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Maintenance
Supervisor - 111C space.
$500 $139
18 Office - 118 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 118 space.
$500 $138
19 Personel Director -
223A
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Personel Director -
223A space.
$500 $135
20 Break Room - 213 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Break Room - 213
space.
$500 $134
21 Office - 203 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 203 space.
$500 $133
22 Office - 222A Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Office - 222A space.
$500 $127
24 Director - 220 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Director - 220 space.
$500 $112
28 Stair - 224 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Stair - 224 space.
$500 $96
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 11
29 Stair - 124 Existing Unoccupied Heating
Setpoint: 60.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 50.0 deg F for
the Stair - 124 space.
$500 $79
30 Plans Room - 113 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Plans Room - 113
space.
$500 $76
31 Hall - 211 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Hall - 211 space.
$500 $69
32 Reception/Waiting
- 122
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Reception/Waiting -
122 space.
$500 $68
33 Men - 108 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Men - 108 space.
$500 $66
34 Women - 105 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Women - 105 space.
$500 $62
35 Custodial - 209 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Custodial - 209 space.
$500 $59
38 Maintenance
Secretary - 111B
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Maintenance Secretary
- 111B space.
$500 $53
44 Hall - 117 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Hall - 117 space.
$500 $24
48 Women - 207 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Women - 207 space.
$500 $9
49 Men - 210 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Men - 210 space.
$500 $9
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 12
51 Hall - 103 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Hall - 103 space.
$500 $0
52 Mail Room - 116 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Mail Room - 116 space.
$500 $0
53 Food Services
Manager - 120
Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Food Services Manager
- 120 space.
$500 $0
54 Reception - 204 Existing Unoccupied Heating
Setpoint: 72.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the Reception - 204 space.
$500 $0
Ventilation
Rank Recommendation Cost Annual
Energy
Savings
39 Use CO2 sensors to modulate AC-1 and AH-1 outside air. Update all HVAC
equipment to electronic controls.
$150,000 $15,275
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
25 Office: Type A -
Lithonia
2GPX440A12-120
Core Zone
47 FLUOR (4) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$2,400 $1,050
26 Exterior: Type L -
Holophane 240-CE-
120-BLK-TP
6 HPS 150 Watt Magnetic Replace with 6 LED 50W
Module StdElectronic
$6,000 $2,602
27 Exterior Pole
Mount: Type N -
Holophane
CADSQ14J/1A/240
HA-120BLK
2 HPS 150 Watt Magnetic Replace with 2 LED 50W
Module StdElectronic
$2,000 $867
36 Hallway, Mail
Room: Type B -
Lithonia
2GPX240A12-120
(changed to 3 lamp
T8's) Core Zone
12 FLUOR (3) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$800 $203
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 13
37 Exterior: Type K
Night Light -
Holophane
2 HPS 100 Watt Magnetic Replace with 2 LED 25W
Module StdElectronic and
Add new Daylight Sensor
$3,000 $720
41 Offices, Hallways:
Type A - Lithonia
2GPX440A12-120
Perimeter Zone
104 FLUOR T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$2,400 $553
42 Maintenance,
Equipment Rooms:
Type C - 8TL240-
120V Core Zone
7 FLUOR (4) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching,
Occupancy Sensor
Remove Manual Switching
and Improve Occupancy
Sensor
$600 $94
43 Restrooms: Type E
- Keene CWBX240-
DW Core Zone
4 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$400 $46
45 Restrooms,
Stiarways: Type E -
Keene CWBX240-
DW Perimeter
Zone
7 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Remove Manual Switching
and Add new Occupancy
Sensor
$800 $71
46 Exterior: Type L -
Holophane 240-CE-
120-BLK-TP
6 HPS 150 Watt Magnetic Add new Daylight Sensor $3,000 $237
47 Exterior Pole
Mount: Type N -
Holophane
CADSQ14J/1A/240
HA-120BLK
2 HPS 150 Watt Magnetic Add new Daylight Sensor $1,000 $79
50 Maintenance,
Equipment Rooms:
Type D - Lithonia L-
240-120V Core
Zone
2 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching,
Occupancy Sensor
Remove Manual Switching
and Improve Occupancy
Sensor
$600 $14
55 Restroom, Storage:
Type B - Lithonia
2GPX240A12-120
Perimeter Zone
8 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Occupancy Sensor
Improve Occupancy Sensor $200 -$81
Refrigeration
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
2 Medium
Refrigerator/Freeze
r
4 Medium Refrigerator/Freezer Add new Seasonal
Shutdown
$1 $63
3 Chest Freezer Chest Freezer Add new Seasonal
Shutdown
$1 $58
4 Small refrigerator 3 Small refrigerator Add new Seasonal
Shutdown
$1 $19
Other Electrical Equipment
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
District Office, BSSD Building
Page 14
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
23 Ingersol Rand
Century 2
Air Compressor with Other
Controls
Replace with Air
Compressor Removed
$2,000 $1,045
Cooking/Clothes Drying
Rank Recommended Installed
Cost
Annual
Energy
Savings
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AkWarmCalc Ver 2.1.4.2, Energy Lib 3/1/2012