HomeMy WebLinkAboutBSSD-WAA-RSA Whales Kingikmiut School 2012-EE
Richard S. Armstrong, PE, LLC
Mechanical/Electrical Engineer
Comprehensive Energy Audit
of
Wales Kingikmiut School
Project # BSSD!WAA!RSA!01
Prepared for:
Bering Strait School District
March 1, 2012
Prepared by:
Richard S. Armstrong, PE, LLC
2321 Merrill Field Drive, C!6
Anchorage, Alaska 99501
&
RSA Engineering, Inc.
2522 Arctic Boulevard, Suite 200
Anchorage, Alaska 99503
ii
TABLE OF CONTENTS
1. Executive Summary 1
2. Audit and Analysis Background 6
3. Acknowledgements 7
4. Building Description & Function 8
5. Historic Energy Consumption 12
6. Energy Efficiency Measures Considered 13
7. Interactive Effects of Projects 13
8. Loan Program 13
Appendix A - Photos 14
Appendix B - AkWarm-C Report 21
Appendix C - Building Plans & Equipment Schedules 39
Submitted by:
_______________________________
Nathan P. Zeigler, PE, CEA
_______________________________
Richard S. Armstrong, PE, CEM, CEA
Date: March 1st, 2012
iii
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
1
Investment Grade Energy Audit
Wales Kingikiut School
1. Executive Summary:
This comprehensive Energy Audit is performed in connection with AHFC’s
Retrofit Energy Assessment for Loans (REAL) program.
Select Building:
Wales Kingikmiut School
101 Beach Drive
Wales, Alaska 99783
Building Owner:
Bering Strait School District (BSSD)
School District Contact:
Bob Dickens, Director Facilities
(907) 624-3611 ext. 4249; bdickens@bssd.org
Building Contact:
Roxie Quick, School Principal
(907) 664-3021
The Wales Kingikmiut School was originally constructed in 1996. No known
additions, renovations or upgrades have occurred since the original construction.
The site visit and inspection for this energy audit was conducted on October 6th,
2011.
Table 1
2009 2009 2010 2010
Utility Consumption Cost/Year Consumption Cost/Year
Electricity-kWh 105,885 $72,992 95,583 $54,088
Oil Consumption
(Therms) 14,342 $43,685 14,461 $40,267
Total Energy
(kBtu) 1,795,566 $116,677 1,772,285 $94,355
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. In order to develop the most
accurate EUI and ECI comparisons possible, only Bering Strait Schools in
remote communities were used to develop the baseline averages. This allows
for similar energy cost, facility usage, and climate comparison between the
2
subject school and the benchmark average. The EUI and ECI baseline averages
are comprised of 16 schools and two years worth of data (2009 & 2010). The
comparative values for the subject building are listed in Table 2 below:
Table 2
Wales Kingikmiut
School
Bering Strait Remote
Community School Ave
Energy Use Index (EUI)
kBTU/SF Avg 2009, 2010 109.4 124.6
Energy Cost Index (ECI)
Average 2009, 2010 $6.47 $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. Exterior Lighting Upgrades: Replace all exterior building wall mounted HID
fixtures with new dark sky compliant LED type wall mounted light fixtures:
LED technology has come a long way, and for applications like this, LED
lights are ready for prime time. LED fixtures use nano reflector technology
with drivers offering 50,000 hours life. That equates to about 6 years, as
compared to only 20,000 hours with HID fixtures. LED fixtures offer the
instant-on feature of fluorescent, but use significantly less energy than the
HID fixtures. LED lamps like the cold, 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 by using
100% cutoff optics to reduce light pollution. The following chart indicates
energy savings for the various exterior building mounted light fixtures
(HSP High Pressure Sodium) using Scotopic lighting measurements:
HID Lamp HID
System
Wattage
LED
System
Wattage
Energy
Savings
(%)
70W HPS 105W 27W 74
250W HPS 300W 108W 64
b. Gymnasium Lighting Upgrades: Replace selected interior metal halide
(MH) high intensity discharge (HID) fixtures with new T-5 high output
3
fluorescents: Now a new generation of smaller, very bright T-5 fluorescent
fixtures are available that can improve energy efficiency of the fixtures by
up to 30% over metal halide fixtures. The existing HID lights have
undesirable features, such as a long re-strike time, which means that they
take several minutes to come back on after being turned off. Because of
this, users typically simply leave the HID lamps on all day if they will be
going in and out of a building or space. Additionally, metal halide lamps,
have serious lamp output depreciation over time, continuously putting out
less and less light. Over the lifetime of the metal halide lamp, the light
output depreciates about in half. The T-5 fluorescent lamps, on the other
hand, maintain at least 90% of their initial lumen output throughout the life
of the lamp, so over time they offer much more light for the power they
consume. Additionally, the linear fluorescent lamps provide improved
lighting uniformity in the space, and reduced shadows. They also provide
improved appearance in the space and have a perceived higher light
level. The proposed lights could be switched on/off with occupancy
sensors since they are instant on, for a dramatic reduction in energy use
during non-occupied times.
c. Occupancy Sensor Lighting Control Upgrades: Occupancy sensors have
evolved over the years to now be more reliable, and have 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.
Dual technology occupancy sensors should be used in larger spaces,
such as warehouses or equipment shops if the HID metal halide lighting
fixtures are replaced with T-5 HO fluorescent fixtures that can light up
instantly, again offering a very fast payback, depending on the frequency
of use in the room.
d. Provide VFD controls for hydronic circulators: Hydronic circulators typically
operate 24/7, so VFD controls that slow the pump down to maintain the
desired differential pressure work well, since as zone valves close, back-
4
pressure increases, so it can be easily controlled with a VFD device. This
is especially effective for pumps that are 1.5 HP or larger. Alternatively,
Wilo company now makes replacement circulators that have built-in VFD
and pressure sensing controls, so a simple packaged pump replacement
will upgrade to VFD control. Using an estimated worse case cost of
$16,346 per drive, the paybacks will vary to 5 years.
e. Air Handling Unit Upgrades: Install a CO2 sensor in the return air stream
of AHU-2 to reduce outside air requirements. Carbon dioxide (CO2) is a
known tracer gas for human metabolic activity, and has been recognized
by ASHRAE and code authorities as a credible way to reduce minimum
outside air (OSA) requirements in air handling units (AHUs). The CO2
sensor would drive the outside air dampers to provide return air from the
rooms with CO2 levels at or below CO2 set-point, (typically <750 PPM
CO2), thus avoiding over-ventilation of the space. The two primary
sources of heat loss from a building are conduction through the building
envelope and loss of heated air through ventilation or infiltration.
Ventilation loads approach conduction loads in well ventilated buildings
located in cold climates. Additionally, building DDC static pressure
controls should be implemented if not already in place. The payback for
this ECM is very difficult to assess without extensive historical review of
actual OSA settings, but it is estimated to save 25% of the OSA heating
requirements caused by over-ventilating. The payback cost, assuming a
cost of $1,500 to install and program each CO2 sensor, is under 2 years.
f. Install Programmable Set-back Thermostats: Buildings that are not
continuously occupied do not require continuous heating levels at 70
degrees, so they can be set back to 55 or 60 degrees F. This is typically
done with relatively inexpensive programmable set-back thermostats or
through DDC systems. The cost of each thermostat with installation
should not exceed $250, with paybacks of one year or less in most cases.
g. Replace shower heads with ultra-low flow models: Older shower heads
delivered 3-9 gallons per Minute (GPM) of water, but over the last 10
years or so, this was reduced to 2.5 GPM as the standard for energy
conserving shower heads. Plumbing manufacturers have now developed
shower heads that will feel like 2.5 GPM or more of water is flowing, but
they will only be using 1.6 to 1.75 GPM. The design of the shower head
does not simply put in a water restriction device, but rather it uses an
innovative spray former that will concentrate the flow of water, reducing
the amount of water used, compared to standard energy saving 2.5 GPM
shower heads. This proposed shower head would yield a 30% reduction
in water, which also means a 30% reduction in hot water, saving the cost
to heat the water which is more substantial than the cost of the water
production itself. Each shower head has a retail price of around $35, so
at wholesale pricing, including shipping, as well as installation each
5
shower head should cost under $60, yielding a payback of one year or
less.
h. Use infra-red self-generating anti-scald automatic faucets at all public
toilet rooms: The Uniform Plumbing Code requires that all lavatories in
public restrooms be equipped with automatic start/stop faucets. Infra-red
actuated faucets have now been proven to save energy, and will be far
superior to the uncontrolled or spring loaded faucets installed in some of
the buildings. Code also now requires that lav faucets used by the public
be equipped with anti-scald protection. Some faucets observed are not
the automatic shutoff type nor are they equipped with thermal anti-scald
protection, so they will waste water and possibly burn users as well. The
newest technology infra-red faucets have self generating power using
turbines in the water flow, so no outside power (outside of a battery back-
up) is required to operate them, which makes for a very simple retrofit.
One proposed retrofit faucet is the Toto Model TEL5GSC-10 which
includes thermal mixing for scald protection as well as a 10 second
maximum flow time per cycle. The Environmental Protection Act of 1992
provides a water consumption standard of no more than 0.25 gallons of
water per cycle. The proposed faucet turns off within 1 second of users’
pulling hands away from the faucet, and also turns off after 10 seconds of
continuous use, thus discharging a maximum of 0.17 gallons of tempered
water per cycle. The cost of the faucets varies by vendors, ranging
between $433 to $637 each, so we will assume an installed cost of $700
each. It is estimated that it would take a plumber 2 hours to remove the
old faucet and install each retrofit faucet. The estimated water savings is
30%, not to mention the safety improvement offered by having anti-scald
tempering faucets which do not presently exist. The payback for this ECM
is estimated to be under 3 years.
i. Fuel Oil Metering: In order to understand current and future fuel
consumption, a fuel meter is essential to be installed at the fuel supply to
the building, assuming the supply is piped. 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
http://pathfinderinstruments.com/gpifuel.htm?gclid=CJuzvdzon6kCFSUaQ
godvgJDvQ.
In addition to EEMs, various Energy Conservation Measures (ECMs) are
recommended since they are policies or procedures that are followed by
6
management and employees that require no capital outlay. Examples of
recommended ECMs for this facility include:
· Turn off lights when leaving a room that is not controlled by an occupancy
sensor that automatically turns off lights.
· All doors and windows should be properly maintainedand adjusted to
close and function properly.
· Turn off computers, monitors, printers, faxes, coffee makers, etc when
leaving the office for the day.
The 53 priority recommendations in the detailed report (Appendix A) estimate to
save $25,274 /year, with an installed cost of $96,825, for a 3.8 year payback. This
does not include design or CA services, but overall it does indicate a cost effective
energy savings program.
2. 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 is then 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.
7
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 for implementing 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. Haakensen Electric was
consulted for some of the lighting retrofit costs. 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.
3. 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
sizing information, two years energy billing data, building schedules and
functions, as well as building age. Special acknowledgement and thanks
are in order for Bob Dickens (BSSD Director Facilities), Roxie Quick
(Wales School Principal), and Dave Ongtowasruk (Wales School
8
Maintenance Supervisor) for their time and assistance during this audit
and for their contributions to this report.
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
Straits area, and the Nana area. The firm gathered all relevant
benchmark information provided to them by Central Alaska Engineering
Company and Nortech, 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.
e. RSA Engineering, Inc. (Energy Auditor): This firm specializes in
mechanical and electrical design, and has trained three of its mechanical
engineers to perform specific energy audits. All three are Certified Energy
Auditors, and have received additional training from Richard S.
Armstrong, PE, LLC to acquire further specific information regarding audit
requirements and potential EEM applications.
4. Building Description and Function: The subject structure is called the
Kingikmiut School. This facility was originally constructed in 1996, and no known
additions, renovations or upgrades have occurred since the original construction.
The building is located on pilings and is mostly a one story structure with a
peaked roof and drop ceilings. The only second floor space utilized is the fan
room and the communications room that is located above the locker rooms and
girls bathroom. The remainder of the second floor area is unusable space
located above the drop ceilings and below the peaked school roof. The facility
serves as the only school for the community of Wales.
a. Heating System: The building heating system consists of three Weil
McLain 878 cast iron oil fired boilers with Carlin Burners, model 702CRD-
W. The boilers and burners are the original equipment that was installed
when the building was constructed in 1996. The boilers are used to heat
9
the buildings hydronic heating system, which in turn provides all of the
heating for the building through baseboard, unit heaters, heating coils in
the air handlers, and heat trace for the water and sewer lines. The
hydronic heating system is a mixture of 50% propylene glycol and 50%
water to provide freeze and burst protection to the hydronic heating
piping.
The circulation of the heating system is broken up into four loops. The
first loop is circulated by a primary and back-up pump (CP-1A (Grundfos
UPC 65-160) & CP-1B (Grundfos UPC 65-160)) that provides all of the
heating for the buildings heat loss by means of baseboard, unit heaters
and cabinet unit heaters. The second loop is circulated by a primary and
back-up pump (CP-2A (Grundfos UPC 65-160) & CP-2B (Grundfos UPC
65-160)) that serves the heating coils for the schools air handling units.
The third loop is circulated by a primary and back-up pump (CP-6A
(Grundfos UP 43-75F) & CP-6B (Grundfos UP 43-75BF)) that serves the
hydronic heat-trace tubing for the buildings waste piping. The fourth loop
is circulated by one pump (CP-3 (Grundfos UMC 65-80)) that serves the
hot water generator which provides the school with domestic hot water.
None of the pumps are equipped with VFD drives, so they run at full
speed at all times.
b. Ventilation System: The ventilation system for the Wales School is
composed of two main air handlers that provide the outside ventilation air
for the facility (AHU-1 and AHU-2), three exhaust fans (EF-1, EF-2 and
EF-3), one supply air fan for the mechanical room (SF-1), two ceiling fans
for destratification of the air in the gym (CF-1), and a portable sawdust
collector for the shop classroom.
AHU-1 (Trane MCCA021) provides the ventilation air for the classroom
and kitchen areas of the school. The fan is run by a 3 horse power motor
operating at 230 volts and single phase power. The unit is controlled by a
7-day programmable time clock. At the time of this energy audit, the time
clock was set to operate AHU-1 from 8:00 am - 4:00 pm Monday through
Friday, 11:00 am – 5:00 pm Saturday and remain off on Sunday. During
the “off” cycle the fan is off, the outside air damper is closed and the
return air damper is open. During the “on” cycle the fan is on, the outside
air damper opens to provide a minimum of 1,350 cfm of outside air. The
1,350 cfm of outside air is for ventilation and equals the total amount of air
exhausted from the restrooms, locker rooms, janitor rooms, and the wood
shop. A discharge air sensor modulates a 3-way valve on the heating coil
to maintain a discharge air temperature of 60 °F, (adjustable). A mixed air
sensor is installed and set at 60 °F to modulate the outside and return air
dampers to allow for more ventilation air at warmer outside air
temperatures. The mixed air sensor is not allowed to decrease outside air
to below the minimum outside air requirement of 1,350 cfm while the unit
10
is operating. AHU-1 is interlocked with EF-1 so that EF-1 will always be
operating whenever AHU-1 is running. AHU-1 is also equipped with a
freeze-stat to shut the unit down in the event that the supply air drops to
below 40 °F.
AHU-2 (Trane MCCA021) provides the ventilation air for the gym and
make-up air for the kitchen. The fan is run by a 3 horse power motor
operating at 230 volts and single phase power. The exhaust air
requirements for the kitchen hood are about the same as the ventilation
outside air requirements for the gym, (2,300 CFM). AHU-2 is controlled
by a manual timer in the gym or the kitchen hood exhaust fan (EF-2).
During the “off” cycle the fan is off, the outside air damper is closed and
the return air damper is open. During the “on” cycle the fan is on, the
outside air damper opens to provide an equal amount of outside air as
discharged by EF-2. A room thermostat in the gym modulates a 3-way
valve on the heating coil to maintain a discharge air temperature of 60 °F,
(adjustable). The room thermostat also controls the mixing air dampers to
bring in additional outside air for cooling if conditions require cooling.
AHU-2 is also equipped with a freeze-stat to shut the unit down in the
event that the supply air drops to below 40 °F.
EF-1 (Greenheck BSQ-80-4) provides a total of 900 CFM of exhaust air
for the toilet rooms, locker rooms, and janitor closets. The fan is run by a
¼ HP motor operating at 120 volts and single phase power. EF-1 is
interlocked with AHU-1 and interlocked with the manual timer for AHU-2.
Based upon the controls, EF-1 is always operating whenever the building
is in occupied mode.
EF-2 (Greenheck Cube-160 HP) provides 2,300 CFM of exhaust air for
the kitchen hood. The fan is run by a 1 HP motor operating at 240 volts
and single phase power. EF-2 is interlocked with AHU-2, and thus always
running whenever AHU-2 is running.
EF-3 (Greenheck BSQ-80-4) provides 450 CFM of exhaust air for the
wood shop exhaust. The fan is run by a ¼ HP motor operating at 120
volts and single phase power. This exhaust fan is operated by a 0 to 60
minute manual timer.
SF-1 (Grainger 7C527) provides 1,975 CFM of supply air into the
mechanical room. The fan is run by a ¼ HP motor operating at 120 volts
and single phase power. This fan is operated by a close on rise
thermostat that turns the fan on when the temperature rises above the
thermostat set-point to provide cooling to the room. At the time of the
site-visit, the fan had been removed from the duct and floor penetration to
the mechanical room. The ductwork was left open to the outside air below
the building.
11
CF-1 (Leading Edge A-60) is a 60 inch destratification fan that serves for
destratification of the air in the gym. Two fans are located in the gym to
keep the air circulating and prevent the hot air from collecting at the
ceiling level and the cold air settling down at the occupied floor level. The
fan is run by a 160 watt motor operating at 120 volts and single phase
power. The fans are controlled by variable speed controllers located in
the gym. The plans call for CF-1 to also be installed in the mechanical
room; however, no fan was present in the mechanical room at the time of
this audit.
A portable sawdust collector (American Air Filter model AR Arrestall AR-
10) is located in the wood shop. This sawdust collector provides 350 CFM
of air filtration with flexible hoses that extent to collect the saw dust at the
source. The fan is run by a ¾ HP motor operating at 115 volts and single
phase power. The fan is operated intermittently as necessary during
periods when the classroom is being used for woodworking.
c. Plumbing System: The Wales School contains five bathrooms of varying
size, two locker rooms with one toilet and three showers each, two janitor
closets with janitor sinks, a kitchen with one three compartment sink, one
two compartment sink and a commercial dishwasher, a concession area
with a sink, eight classroom sinks, a staff break room with a sink, and a
storage area that contains a clothes washer and dryer.
d. Domestic Hot Water: How water for the Wales School is produced by a
120 gallon hot water generator (Amtrol Boilermate WHS-120ZCDW). The
hot water generator has a first hour rating of 372 gallons at a temperature
rise of 90 °F and a continuous flow rating of 268 gallons per hour. The
current hot water generator was installed in 2005 to replace the original
hot water generator for the school. The kitchen is supplied with 140 °F
water while the rest of the hot water in the facility is supplied at 110 °F.
When the new hot water generator was installed in 2005, the piping for
the hot water generator was reconfigured and CP-4 was removed. The
original glycol circulating pump for the hot water generator was left in
place (CP-3). This pump is a constant volume, constant pressure pump
and is grossly oversized for the current configuration of the hot water
generator. It is recommended that CP-3 be replaced with a VFD
(Grundfos Magna or equal) pump to reduce unnecessary energy
consumption by the pump.
The Wales School is also equipped with an electric boiler that is
connected to a wind turbine system installed in the community. The wind
turbines and electric boiler system was installed by and is maintained by
Kotzebue Electric Association. During conversations with the school
12
district I was informed that the electric boiler and associated wind
powered equipment has never been operated due to higher utility rates
associated with the use of the wind power than that of fuel oil for the
boilers. It is unfortunate that a renewable energy wind turbine system has
been fully installed and is ready for operation, but is not being used due to
administrative cost disagreements. The use of this energy source will
dramatically reduce the use of fuel oil and electricity by the school and the
community as a whole. A resolution to this issue should be attempted for
the benefit of the Community of Wales.
e. Lighting: Typical lighting throughout the building is comprised of T-8
fluorescent fixtures with electronic ballasts. The lighting in the gym is
comprised of twelve 400 watt metal halide fixtures. The school has
twenty-three emergency light wall packs (Dual-Lite model EZ-2F). Two
different types of lighting fixtures are used on the exterior of the building,
both of which are high pressure sodium (HPS) lights. Under the covered
entryways six 50 watt HPS surface mounted fixtures are installed.
For site lighting, four 250 watt HPS wall packs are installed at various
locations on the exterior walls. During the daylight hours one of the 250
watt HPS lights was observed to be on, all other exterior lights were off.
The school contains eight LED exit signs and one non-powered tritium exit
sign.
Located in the plumbing chases and in a closet are three surface mounted
two-bulb PL13 fixtures with magnetic ballasts. These three fixtures are
the only fixtures in the facility with magnetic ballasts.
5. 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.
The average electric consumption for the building is 100,734 kWh/year at an
average cost of $63,540 /year. The average fuel oil consumption is 10,910
gallons/year, at an average annual cost of $41,976 /year. This results in the total
average utility costs for the building of $105,516 /year.
6. Energy Efficiency Measures considered or recommended: The building was
examined for application of a multitude of potential EEMs. 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.
The accuracy of the cost estimates and paybacks varies significantly due to a
multitude of conditions, but is estimated to be approximately +/- 25%.
13
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.
7. 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.
8. 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.
Appendix A
Appendix A: Wales School Pictures
Photo 1: West elevation view.
Photo 3: Southwest elevation view.
Photo 5: East elevation view at
mechanical room.
Photo 2: School domestic and fire water
tanks.
Photo 4: South elevation view.
Photo 6: East elevation view at gym.
Appendix A: Wales School Pictures
Photo 7: Northeast elevation view.
Photo 9: Typical classroom.
Photo 11: AHU-1 time clock controller.
Photo 8: Northeast elevation view.
Photo 10: Gym with metal halide HID
lights and destratification fans.
Photo 12: AHU-2 (serving gym) 12 hour
timer switch.
Appendix A: Wales School Pictures
Photo 13: Mechanical room boilers.
Photo 15: School back-up generator.
Photo 14: Mechanical room pumps.
Photo 16: School Fire pump.
Appendix B
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 1
ENERGY AUDIT REPORT – PROJECT SUMMARY – Created 2/8/2012 12:40 PM
General Project Information
PROJECT INFORMATION AUDITOR INFORMATION
Building: Wales School Auditor Company: RSA Engineering, Inc.
Address: 101 Beach Drive Auditor Name: Nathan P. Zeigler
City: Wales Auditor Address: 2522 Arctic Blvd. Suite 200
Anchorage, Alaska 99503 Client Name: Roxie Quick
Client Address: P.O. Box 490
Wales, Alaska 99783
Auditor Phone: (907) 276-0521
Auditor FAX: (907) 276-1751
Client Phone: (907) 664-3021 Auditor Comment:
Client FAX: (907) 664-3031
Design Data
Building Area: 17,116 square feet Design Heating Load: Design Loss at Space: 610,412
Btu/hour
with Distribution Losses: 748,777 Btu/hour
Plant Input Rating assuming 82.0% Plant Efficiency and
25% Safety Margin: 1,141,428 Btu/hour
Note: Additional Capacity should be added for DHW load,
if served.
Typical Occupancy: 69 people Design Indoor Temperature: 70 deg F (building average)
Actual City: Wales Design Outdoor Temperature: -36.4 deg F
Weather/Fuel City: Wales Heating Degree Days: 15,939 deg F-days
Utility Information
Electric Utility: AVEC-Wales - Commercial - Lg Natural Gas Provider: None
Average Annual Cost/kWh: $0.541/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
$69,522 $0 $33,817 $14,487 $3,741 $15,05
4
$3,965 $284 $4,560 $60 $145,489
With
Proposed
Retrofits
$52,666 $0 $30,284 $7,846 $3,109 $13,76
0
$3,992 $286 $6,175 $60 $118,179
SAVINGS $16,856 $0 $3,533 $6,641 $631 $1,294 -$27 -$2 -$1,615 $0 $27,311
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 2
$0
$20,000
$40,000
$60,000
$80,000
$100,000
$120,000
$140,000
$160,000
Existing Retrofit
Service Fees
Ventilation and Fans
Space Heating
Refrigeration
Other Electrical
Lighting
Domestic Hot Water
Cooking
Clothes Drying
Annual Energy Costs by End Use
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 3
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
1 Other Electrical: TV -
Flatscreen
Improve Manual Switching $770 $10 492.15 0
2 Refrigeration: Chest
Freezer
Add new Seasonal
Shutdown
$228 $10 145.46 0
3 Setback Thermostat:
125 - Gymnasium
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 125 - Gymnasium
space.
$1,884 $200 141.40 0.1
4 Setback Thermostat:
200 - Fan Room
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 200 - Fan Room space.
$1,450 $200 108.84 0.1
5 Ventilation Install CO2 sensor in the
return air stream of AHU-2
to reduce the outside air
requirements.
$1,927 $500 66.24 0.3
6 Setback Thermostat:
132 - Mechanical
Room/Generator
Room
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 132 - Mechanical
Room/Generator Room
space.
$776 $200 58.23 0.3
7 Refrigeration:
Refrigerator
Add new Seasonal
Shutdown
$105 $10 58.97 0.1
8 Setback Thermostat:
112 - Classroom
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 112 - Classroom space.
$717 $200 53.79 0.3
9 Setback Thermostat:
104 - Information
Center
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 104 - Information
Center space.
$665 $200 49.87 0.3
10 Setback Thermostat:
110 - Kindergarten
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 110 - Kindergarten
space.
$659 $200 49.48 0.3
11 Refrigeration: Chest
Freezer
Add new Seasonal
Shutdown
$85 $10 48.75 0.1
12 Setback Thermostat:
135 - Classroom
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 135 - Classroom space.
$634 $200 47.59 0.3
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 4
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
13 Other Electrical:
Computer - Desktop
Improve Manual Switching $82 $10 46.94 0.1
14 Setback Thermostat:
134 - Classroom
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 134 - Classroom space.
$550 $200 41.26 0.4
15 Setback Thermostat:
109 - Classroom
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 109 - Classroom space.
$486 $200 36.45 0.4
16 Setback Thermostat:
133 - Wood Shop
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 133 - Wood Shop
space.
$389 $200 29.21 0.5
17 Other Electrical:
Computer - Laptop
Improve Manual Switching $49 $10 28.01 0.2
18 Other Electrical:
Printer
Improve Manual Switching $45 $10 25.61 0.2
19 Other Electrical:
Printer
Improve Manual Switching $40 $10 25.50 0.3
20 Setback Thermostat:
107 - Special
Education
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 107 - Special Education
space.
$304 $200 22.80 0.7
21 Other Electrical:
Computer - Laptop
Improve Manual Switching $35 $10 22.31 0.3
22 Other Electrical:
Printer
Improve Manual Switching $29 $10 16.81 0.3
23 Setback Thermostat:
131 - Storage
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 131 - Storage space.
$220 $200 16.51 0.9
24 Setback Thermostat:
101 - Workroom
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 101 - Workroom
space.
$219 $200 16.43 0.9
25 Other Electrical:
Printer
Improve Manual Switching $24 $10 15.62 0.4
26 Other Electrical:
Computer - Desktop
Improve Manual Switching $24 $10 15.62 0.4
27 Other Electrical:
Printer/Fax Machine
Improve Manual Switching $23 $10 14.66 0.4
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 5
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
28 Setback Thermostat:
116 - PE Room
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 116 - PE Room space.
$183 $200 13.74 1.1
29 Refrigeration:
Refrigerator - Half
Size
Add new Seasonal
Shutdown
$24 $10 13.85 0.4
30 Setback Thermostat:
100 - Vestibule
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 100 - Vestibule space.
$176 $200 13.19 1.1
31 Setback Thermostat:
118 - Locker Room
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 118 - Locker Room
space.
$172 $200 12.91 1.2
32 Setback Thermostat:
130 - Vestibule
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 130 - Vestibule space.
$153 $200 11.52 1.3
33 Setback Thermostat:
201 - Comm Room
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 201 - Comm Room
space.
$110 $200 8.29 1.8
34 Setback Thermostat:
102A - Principal
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 102A - Principal space.
$95 $200 7.13 2.1
35 Setback Thermostat:
103 - Commons
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 103 - Commons space.
$89 $200 6.72 2.2
36 Other Electrical:
Printer
Improve Manual Switching $10 $10 6.58 1
37 Exterior Door: 113A Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$157 $690 6.14 4.4
38 Exterior Door: 100A Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$314 $1,380 6.13 4.4
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 6
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
39 Exterior Door: 130A Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$314 $1,380 6.13 4.4
40 Exterior Door: 132B Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$314 $1,380 6.13 4.4
41 Other Electrical:
Printer
Improve Manual Switching $8 $10 4.71 1.2
42 Setback Thermostat:
113 - Vestibule
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 113 - Vestibule space.
$62 $200 4.68 3.2
43 Other Electrical:
Student personal
computers
Improve Manual Switching $8 $10 4.43 1.3
44 Lighting: Type G -
Hubbell MSM-
C400H-2P8-4-F1 with
MSQ-SPC Shield
Add new Occupancy
Sensor
$503 $700 4.12 1.4
45 Lighting: Type M -
Lithonia TWH-250S-
1120-SF-CR-70F-RNP
Replace with 4 LED 100W
Module StdElectronic
$1,626 $5,333 3.54 3.3
46 Setback Thermostat:
102 - Administration
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 102 - Administration
space.
$39 $200 2.96 5.1
47 Setback Thermostat:
115 - Toilet
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 115 - Toilet space.
$34 $200 2.55 5.9
48 Lighting: Type N -
Lithonia VR3C-50S-
120-SF-RHP
Replace with 6 LED 20W
Module StdElectronic
$645 $3,000 2.50 4.6
49 Lighting: Type B3 -
Lithonia 2SP-G-3-32-
-A12125-120-GEB10
Add new Occupancy
Sensor
$470 $1,400 1.92 3
50 Setback Thermostat:
105 - Corridor
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 105 - Corridor space.
$24 $200 1.78 8.4
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 7
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
51 Setback Thermostat:
129 - Storage
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 129 - Storage space.
$22 $200 1.69 8.9
52 HVAC And DHW Provide VFD controls for
hydronic circulators; Install
timers and and implement
schedule for HWC pumps
(CP-4 & CP-5) to operate
during the hours of 6am to
10 pm only; Replace
existing lavatory faucets
with infra-red automatic
faucets; Replace existing
shower heads with ultra-
low flow shower heads.
$7,282 $75,693 1.41 10.4
53 Setback Thermostat:
119 - Locker Room
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 119 - Locker Room
space.
$18 $200 1.32 11.3
54 Setback Thermostat:
114 - Chases A & B
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 114 - Chases A & B
space.
$12 $200 0.90 16.7
55 Lighting: Type C2 -
Kenall 7235-0-EBT8
Add new Occupancy
Sensor
$319 $2,100 0.85 6.6
56 Lighting: Type C2W -
Kenall 7235-0-EBT8
Add new Occupancy
Sensor
$49 $350 0.79 7.1
57 Setback Thermostat:
106 - Coun/Flex
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 106 - Coun/Flex space.
$9 $200 0.70 21.5
58 Lighting: Type A3 -
Lithonia 2PM3-G-B-
3-32-18-LD-120-
GEB10
Replace with 85 FLUOR (3)
T8 4' F32T8 32W Standard
Instant StdElectronic and
Add new Occupancy
Sensor
$302 $3,500 0.48 11.6
59 Lighting: Type S -
Lithonia C232-
Add new Occupancy
Sensor
$281 $3,500 0.45 12.5
60 Window/Skylight:
Type 1A
Replace existing window
with triple pane, 2 low-E,
argon window.
$72 $3,398 0.41 47.4
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 8
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
61 Window/Skylight:
Type 1 - Not South
facing
Replace existing window
with triple pane, 2 low-E,
argon window.
$438 $20,388 0.41 46.5
62 Window/Skylight:
Type 2 - Not South
facing
Replace existing window
with triple pane, 2 low-E,
argon window.
$12 $566 0.40 47.6
63 Lighting: Type K1 -
Pal AR621-8-C-LP/LP-
XX-120-2-ELB with
AR600-L90-C-XX
CORNERS
Add new Occupancy
Sensor
$21 $350 0.34 16.3
64 Window/Skylight:
Type 2 - South Facing
Replace existing window
with triple pane, 2 low-E,
argon window.
$19 $1,133 0.32 61
65 Window/Skylight:
Type 1 - South facing
windows
Replace existing window
with triple pane, 2 low-E,
argon window.
$167 $10,194 0.32 61.1
66 Lighting: Type B2 -
Lithonia 2SP-G-2-32-
-A12125-120-GEB10
Replace with 12 FLUOR (2)
T8 4' F32T8 32W Standard
Instant StdElectronic and
Add new Occupancy
Sensor
$63 $1,400 0.25 22.1
67 Other Electrical:
Printer/Scanner
Improve Manual Switching $0 $10 0.23 24.6
68 Lighting: Type K2 -
Pal AR621-4-X-LP/LP-
XX-120-2-ELB
Add new Occupancy
Sensor
$14 $350 0.22 25.8
69 Lighting: Type G -
Hubbell MSM-
C400H-2P8-4-F1 with
MSQ-SPC Shield
Replace with 12 FLUOR (4)
T5 45.2" F54W/T5 HO
Energy-Saver StdElectronic
$217 $6,000 0.20 27.7
70 Lighting: Type F -
Lithonia M232A12-
120-
Add new Occupancy
Sensor
$42 $1,750 0.13 41.7
71 Setback Thermostat:
108 - Str/Flex
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 108 - Str/Flex space.
$0 $200 0.00 Infinity
72 Setback Thermostat:
111 - Toilet
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 111 - Toilet space.
$0 $200 0.00 Infinity
73 Setback Thermostat:
120 - Stair
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 120 - Stair space.
$0 $200 0.00 Infinity
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 9
PRIORITY LIST – RECOMMENDED ENERGY EFFICIENCY MEASURES
Rank Feature Recommendation Annual Energy
Savings
Installed
Cost
SIR Payback
(Years)
74 Setback Thermostat:
121 - Janitor
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 121 - Janitor space.
$0 $200 0.00 Infinity
75 Setback Thermostat:
122 - Girls
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 122 - Girls space.
$0 $200 0.00 Infinity
76 Setback Thermostat:
123 - Boys
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 123 - Boys space.
$0 $200 0.00 Infinity
77 Setback Thermostat:
124 - Janitor
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 124 - Janitor space.
$0 $200 0.00 Infinity
78 Setback Thermostat:
126 - Kitchen
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 126 - Kitchen space.
$0 $200 0.00 Infinity
79 Setback Thermostat:
127 - Storage
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 127 - Storage space.
$0 $200 0.00 Infinity
80 Setback Thermostat:
128 - Toilet
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 128 - Toilet space.
$0 $200 0.00 Infinity
81 Setback Thermostat:
136 - Corridor
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 136 - Corridor space.
$0 $200 0.00 Infinity
TOTAL $27,311 $154,413 2.49 5.7
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
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 10
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
37 Exterior Door:
113A
Door Type: Metal 1-3/4", paper
honeycomb core
Modeled R-Value: 1.8
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$690 $157
38 Exterior Door:
100A
Door Type: Metal 1-3/4", paper
honeycomb core
Modeled R-Value: 1.8
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$1,380 $314
39 Exterior Door:
130A
Door Type: Metal 1-3/4", paper
honeycomb core
Modeled R-Value: 1.8
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$1,380 $314
40 Exterior Door: 132B Door Type: Metal 1-3/4", paper
honeycomb core
Modeled R-Value: 1.8
Remove existing door and
install standard pre-hung
U-0.16 insulated door,
including hardware.
$1,380 $314
Windows and Glass Doors – Replacement
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
60 Window/Skylight:
Type 1A
Glass: Triple, Glass
Frame: Wood\Vinyl
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U-Value: 0.38
Solar Heat Gain Coefficient
including Window Coverings:
0.41
Replace existing window
with triple pane, 2 low-E,
argon window.
$3,398 $72
61 Window/Skylight:
Type 1 - Not South
facing
Glass: Triple, Glass
Frame: Wood\Vinyl
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U-Value: 0.38
Solar Heat Gain Coefficient
including Window Coverings:
0.41
Replace existing window
with triple pane, 2 low-E,
argon window.
$20,388 $438
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 11
62 Window/Skylight:
Type 2 - Not South
facing
Glass: Triple, Glass
Frame: Wood\Vinyl
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U-Value: 0.38
Solar Heat Gain Coefficient
including Window Coverings:
0.41
Replace existing window
with triple pane, 2 low-E,
argon window.
$566 $12
64 Window/Skylight:
Type 2 - South
Facing
Glass: Triple, Glass
Frame: Wood\Vinyl
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U-Value: 0.38
Solar Heat Gain Coefficient
including Window Coverings:
0.41
Replace existing window
with triple pane, 2 low-E,
argon window.
$1,133 $19
65 Window/Skylight:
Type 1 - South
facing windows
Glass: Triple, Glass
Frame: Wood\Vinyl
Spacing Between Layers: Half
Inch
Gas Fill Type: Air
Modeled U-Value: 0.38
Solar Heat Gain Coefficient
including Window Coverings:
0.41
Replace existing window
with triple pane, 2 low-E,
argon window.
$10,194 $167
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
52 Provide VFD controls for hydronic circulators; Install timers and and implement
schedule for HWC pumps (CP-4 & CP-5) to operate during the hours of 6am to 10
pm only; Replace existing lavatory faucets with infra-red automatic faucets; Replace
existing shower heads with ultra-low flow shower heads.
$75,693 $7,282
Setback Thermostat
Rank Location Size/Type/Condition Recommendation Installed
Cost
Annual
Energy
Savings
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 12
3 125 - Gymnasium Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 125 - Gymnasium
space.
$200 $1,884
4 200 - Fan Room Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 200 - Fan Room space.
$200 $1,450
6 132 - Mechanical
Room/Generator
Room
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 132 - Mechanical
Room/Generator Room
space.
$200 $776
8 112 - Classroom Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 112 - Classroom space.
$200 $717
9 104 - Information
Center
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 104 - Information
Center space.
$200 $665
10 110 - Kindergarten Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 110 - Kindergarten
space.
$200 $659
12 135 - Classroom Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 135 - Classroom space.
$200 $634
14 134 - Classroom Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 134 - Classroom space.
$200 $550
15 109 - Classroom Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 109 - Classroom space.
$200 $486
16 133 - Wood Shop Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 133 - Wood Shop
space.
$200 $389
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 13
20 107 - Special
Education
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 107 - Special Education
space.
$200 $304
23 131 - Storage Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 131 - Storage space.
$200 $220
24 101 - Workroom Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 101 - Workroom space.
$200 $219
28 116 - PE Room Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 116 - PE Room space.
$200 $183
30 100 - Vestibule Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 100 - Vestibule space.
$200 $176
31 118 - Locker Room Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 118 - Locker Room
space.
$200 $172
32 130 - Vestibule Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 130 - Vestibule space.
$200 $153
33 201 - Comm Room Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 201 - Comm Room
space.
$200 $110
34 102A - Principal Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 102A - Principal space.
$200 $95
35 103 - Commons Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 103 - Commons space.
$200 $89
42 113 - Vestibule Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 113 - Vestibule space.
$200 $62
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 14
46 102 -
Administration
Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 102 - Administration
space.
$200 $39
47 115 - Toilet Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 115 - Toilet space.
$200 $34
50 105 - Corridor Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 105 - Corridor space.
$200 $24
51 129 - Storage Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 129 - Storage space.
$200 $22
53 119 - Locker Room Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 119 - Locker Room
space.
$200 $18
54 114 - Chases A & B Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 114 - Chases A & B
space.
$200 $12
57 106 - Coun/Flex Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 106 - Coun/Flex space.
$200 $9
71 108 - Str/Flex Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 108 - Str/Flex space.
$200 $0
72 111 - Toilet Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 111 - Toilet space.
$200 $0
73 120 - Stair Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 120 - Stair space.
$200 $0
74 121 - Janitor Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 121 - Janitor space.
$200 $0
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 15
75 122 - Girls Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 122 - Girls space.
$200 $0
76 123 - Boys Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 123 - Boys space.
$200 $0
77 124 - Janitor Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 124 - Janitor space.
$200 $0
78 126 - Kitchen Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 126 - Kitchen space.
$200 $0
79 127 - Storage Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 127 - Storage space.
$200 $0
80 128 - Toilet Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 128 - Toilet space.
$200 $0
81 136 - Corridor Existing Unoccupied Heating
Setpoint: 70.0 deg F
Implement a Heating
Temperature Unoccupied
Setback to 60.0 deg F for
the 136 - Corridor space.
$200 $0
Ventilation
Rank Recommendation Cost Annual
Energy
Savings
5 Install CO2 sensor in the return air stream of AHU-2 to reduce the outside air
requirements.
$500 $1,927
3. Appliances and Lighting
Lighting Fixtures and Controls
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
44 Type G - Hubbell
MSM-C400H-2P8-
4-F1 with MSQ-SPC
Shield
12 MH 400 Watt StdElectronic
with Manual Switching, Multi-
Level Switch
Add new Occupancy Sensor $700 $503
45 Type M - Lithonia
TWH-250S-1120-
SF-CR-70F-RNP
4 HPS 250 Watt Magnetic with
Manual Switching
Replace with 4 LED 100W
Module StdElectronic
$5,333 $1,626
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 16
48 Type N - Lithonia
VR3C-50S-120-SF-
RHP
6 HPS 50 Watt Magnetic with
Manual Switching
Replace with 6 LED 20W
Module StdElectronic
$3,000 $645
49 Type B3 - Lithonia
2SP-G-3-32- -
A12125-120-GEB10
34 FLUOR (3) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Add new Occupancy Sensor $1,400 $470
55 Type C2 - Kenall
7235-0-EBT8
23 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Add new Occupancy Sensor $2,100 $319
56 Type C2W - Kenall
7235-0-EBT8
5 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Add new Occupancy Sensor $350 $49
58 Type A3 - Lithonia
2PM3-G-B-3-32-18-
LD-120-GEB10
85 FLUOR (3) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching, Multi-
Level Switch
Replace with 85 FLUOR (3)
T8 4' F32T8 32W Standard
Instant StdElectronic and
Add new Occupancy Sensor
$3,500 $302
59 Type S - Lithonia
C232-
59 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Add new Occupancy Sensor $3,500 $281
63 Type K1 - Pal
AR621-8-C-LP/LP-
XX-120-2-ELB with
AR600-L90-C-XX
CORNERS
4 FLUOR (8) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Add new Occupancy Sensor $350 $21
66 Type B2 - Lithonia
2SP-G-2-32- -
A12125-120-GEB10
12 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Replace with 12 FLUOR (2)
T8 4' F32T8 32W Standard
Instant StdElectronic and
Add new Occupancy Sensor
$1,400 $63
68 Type K2 - Pal
AR621-4-X-LP/LP-
XX-120-2-ELB
5 FLUOR (4) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Add new Occupancy Sensor $350 $14
69 Type G - Hubbell
MSM-C400H-2P8-
4-F1 with MSQ-SPC
Shield
12 MH 400 Watt StdElectronic
with Manual Switching, Multi-
Level Switch
Replace with 12 FLUOR (4)
T5 45.2" F54W/T5 HO
Energy-Saver StdElectronic
$6,000 $217
70 Type F - Lithonia
M232A12-120-
16 FLUOR (2) T8 4' F32T8 32W
Standard Instant StdElectronic
with Manual Switching
Add new Occupancy Sensor $1,750 $42
Refrigeration
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
2 Chest Freezer 3 Freezer Add new Seasonal
Shutdown
$10 $228
7 Refrigerator 2 Home Economics / Wood
Shop
Add new Seasonal
Shutdown
$10 $105
11 Chest Freezer 2 Freezer Add new Seasonal
Shutdown
$10 $85
Energy Audit – Energy Analysis and Cost Comparison
AkWarm Commercial Audit Software
Wales School
Page 17
29 Refrigerator - Half
Size
Classroom Accessories Add new Seasonal
Shutdown
$10 $24
Other Electrical Equipment
Rank Location Existing Recommended Installed
Cost
Annual
Energy
Savings
1 TV - Flatscreen School Equipment with Manual
Switching
Improve Manual Switching $10 $770
13 Computer -
Desktop
6 Computer Equipment with
Manual Switching
Improve Manual Switching $10 $82
17 Computer - Laptop 5 Computer Equipment with
Manual Switching
Improve Manual Switching $10 $49
18 Printer 2 School Equipment with
Manual Switching
Improve Manual Switching $10 $45
19 Printer School Equipment with Manual
Switching
Improve Manual Switching $10 $40
21 Computer - Laptop 2 Computer Equipment with
Manual Switching
Improve Manual Switching $10 $35
22 Printer 3 School Equipment with
Manual Switching
Improve Manual Switching $10 $29
25 Printer School Equipment with Manual
Switching
Improve Manual Switching $10 $24
26 Computer -
Desktop
Computer Equipment with
Manual Switching
Improve Manual Switching $10 $24
27 Printer/Fax
Machine
School Equipment with Manual
Switching
Improve Manual Switching $10 $23
36 Printer School Equipment with Manual
Switching
Improve Manual Switching $10 $10
41 Printer School Equipment with Manual
Switching
Improve Manual Switching $10 $8
43 Student personal
computers
20 Computer Equipment with
Manual Switching
Improve Manual Switching $10 $8
67 Printer/Scanner School Equipment with Manual
Switching
Improve Manual Switching $10 $0
Cooking/Clothes Drying
Rank Recommended Installed
Cost
Annual
Energy
Savings
Appendix C