HomeMy WebLinkAboutSEA-AEE-Petersburg Middle High School 2012-EE
Petersburg Middle & High School
Petersburg City School District
Funded by:
Final Report
December 2011
Prepared by:
Energy Audit
Table of Contents
Section 1: Executive Summary 2
Section 2: Introduction 7
Section 3: Energy Efficiency Measures 10
Section 4: Description of Systems 21
Section 5: Methodology 24
Appendix A: Energy and Life Cycle Cost Analysis 27
Appendix B: Energy and Utility Data 41
Appendix C: Equipment Data 52
Appendix D: Abbreviations 57
Audit Team
The energy audit is performed by Alaska Energy Engineering LLC of Juneau, Alaska. The audit team
consists of:
Jim Rehfeldt, P.E., Energy Engineer
Jack Christiansen, Energy Consultant
Brad Campbell, Energy Auditor
Loras O’Toole P.E., Mechanical Engineer
Will Van Dyken P.E., Electrical Engineer
Curt Smit, P.E., Mechanical Engineer
Philip Iverson, Construction Estimator
Karla Hart, Technical Publications Specialist
Jill Carlile, Data Analyst
Grayson Carlile, Energy Modeler
Petersburg Middle & High School 1 Energy Audit (December 2011)
Section 1
Executive Summary
An energy audit of the Petersburg Middle & High School was performed by Alaska Energy
Engineering LLC. The investment grade audit was funded by Alaska Housing Finance Corporation
(AHFC) to identify opportunities to improve the energy performance of public buildings throughout
Alaska.
The Petersburg Middle School & High School is a 99,282 square foot building complex that contains
commons, classrooms, offices, a music room, a gym, a library, a wrestling room, an auditorium,
locker rooms, storage, mechanical support spaces, and a vocational education building. The heating
plant for the school also serves the adjacent Community Gym.
Building Assessment
The following summarizes our assessment of the building.
Envelope
The building envelope appears to be in good condition and providing good service. While the
aluminum framed windows and main entry doors are not energy efficient in design, they are not
oversized or excessive in number. The installation of exterior wall insulation on the original high
school has significantly improved the energy efficiency performance of the building, and the attic
spaces are also well insulated. The building is not without envelope issues, including:
Operable Aluminum Windows: Many of the operable sections of the aluminum framed
exterior windows are damaged and/or fail to close properly. Several do not fully close. The
window frames and guide systems should be repaired to allow proper operation and tight
closure with new weather-stripping. In addition to the damaged operable sections, there are
two broken windows that should be repaired.
Auditorium Windows: The interior surface temperature of the window frames was found to
be 46°F on a 30°F day. This is significantly lower than expected for modern windows and is
most likely due to the minimal spacing between the double glazings. Unfortunately these
windows represent a significant portion of the wall square footage.
Dryvit Wall System: Water/ice damage appears to be responsible for lifting and cracking of
the Dryvit wall system on the north side of the building. The damage at the north auditorium
exit door is so extensive that much of the bottom door frame and adjoining wall section needs
to be replaced. The cause of this may be water running off the upper roof section onto the
lower roofs and down the outer walls.
Exterior Doors: Exterior doors are not thermally broken and the aluminum doors are not
insulated. Future exterior door replacement selection should include these features. Weather
stripping is in poor condition and should be replaced.
Petersburg Middle & High School 2 Energy Audit (December 2011)
Heating & Ventilation Systems
The building is heated by two fuel oil boilers that provide heat to thirteen air handling unit systems,
hydronic heating units, domestic hot water heaters, and perimeter heating units. The building
circulation pumps have VFDs that vary electrical consumption with heating loads. The boiler systems
and associated equipment appear to be providing good service. Upgrades from pneumatic to DDC
controllers on much of the system level heating units have improved performance and efficiency. It is
recommended that the zone level controllers be upgraded for this same purpose.
With the exception of S-2 for the gym, the school building utilizes fixed flow air handling systems to
deliver conditioned air within the building envelope. The rate at which air is delivered is based on the
square footage of the spaces and is not currently controlled to decrease the delivery rate when fewer
occupants are in a space. The auditorium is a good example. This space is occupied 24 hours per
week under the current schedule; however it is lightly occupied during classes or after school. The
ventilation fan schedule for the auditorium space has the air handling units operating 54.5 hours per
week. At least 30.5 hours per week the auditorium air handlers are operating to supply an empty
space. Much of the rest of the time the auditorium is not occupied at a level that requires full-volume
ventilation. Energy will be saved if the amount of ventilation air is reduced during periods of low
occupancy and the air handling unit is turned off when the space is not occupied.
The greatest potential energy savings for the facility is the replacement of the older Cleaver Brooks
fuel oil boiler with electric boiler(s) that can supply heat at lower cost. A transition from fuel oil
boilers to electric boilers would significantly reduce both energy and maintenance costs. By retaining
the newer Well McLain fuel oil boiler, the school would have full back up capability on a fuel oil
source should Petersburg Municipal Light & Power request a reduction in electrical loading during a
period of low hydroelectric power availability.
There are periods of the year where the high school has a significant heating load and the community
has an available surplus of hydroelectric power. It will be beneficial to the community to install an
electric boiler system in the high school and heat this essential community building with less
expensive hydroelectric power. This same approach of a primary electric boiler source with a back-up
fuel oil boiler source is used by the Wrangell High School. This is analyzed in Section 3, Energy
Efficiency Measures.
There is a significant amount of damaged duct insulation throughout the building. Standard duct tape
is not effective on duct insulation. Foil-backed tape should be used. Energy will be saved if the duct
insulation is repaired.
In general, the heating and ventilating systems appear to be in good condition; however fairly simple
improvements can be made to improve its effectiveness and efficiency. These are outlined in Section
3, Energy Efficiency Measures.
Lighting
Interior lighting consists primarily of T12 fluorescent fixtures throughout the school and metal halide
pendant fixtures in the gymnasium and commons area. Exterior lighting consists primarily of high
pressure sodium and compact fluorescent fixtures. Because the additional heat produced by the T12
fluorescent fixtures is beneficial toward heating the building and the cost of hydroelectric power is
very reasonable, the current maintenance plan of replacing the T12 fixtures with more efficient T8
fixtures as an in-house project when the ballasts fail is a responsible approach for phasing in the
newer and more efficient T8 fixtures.
Petersburg Middle & High School 3 Energy Audit (December 2011)
A common energy efficiency measure for gyms in communities with high electrical rates is a retrofit
of the metal halide pendant fixtures with more efficient T-5 fluorescent fixtures. As with the T12
fixtures, the affordable cost of electricity in Petersburg makes the existing gym light fixtures also
perform as cost effective heaters for the space. During the audit the outside temperature was 36
degrees and the gym heat was actually off because all of the heat demand for the space was being
supplied by the lighting. While more efficient fixtures would reduce the electrical demand for the
gym space, that savings would be offset by the increasing fuel oil demand to heat the space.
Summary
It was the assessment of the energy audit team that the greatest energy efficiency opportunity for the
Petersburg Middle & High School is a transition from fuel oil to electricity as the primary heat source
for the facility. This is outlined in Section 3, Energy Efficiency Measures.
Energy Efficiency Measures (EEMs)
All buildings have opportunities to improve their energy efficiency. The energy audit revealed
numerous opportunities in which an efficiency investment will result in a net reduction in long-term
operating costs.
Behavioral and Operational EEMs
The following EEMs require behavioral and operational changes in the building use. The savings are
not readily quantifiable but these EEMs are highly recommended as low-cost opportunities that are a
standard of high performance buildings.
EEM-1: Weather-strip Doors
EEM-2: Replace Broken Windows
EEM-3: Repair Inoperable Windows
EEM-4: Insulate Top of Wall Cavity Between High School & Middle School Walls
EEM-5: Insulate SF-5 Hot Deck Coil
Petersburg Middle & High School 4 Energy Audit (December 2011)
High and Medium Priority EEMs
The following EEMs are recommended for investment. They are ranked by life cycle savings to
investment ratio (SIR). This ranking method places a priority on low cost EEMs which can be
immediately funded, generating energy savings to fund higher cost EEMs in the following years.
Negative values, in parenthesis, represent savings.
25-Year Life Cycle Cost Analysis
Investment Operating Energy Total SIR
High Priority EEM-
6: Replace Aerators and Showerheads $2,000 $0 ($352,700) ($350,700) 176.4
7: Perform Boiler Combustion Test $1,000 $16,300 ($64,900) ($47,600) 48.6
8: Repair S-3 (Mat Room) Outside Air Damper $5,300 $3,400 ($145,000) ($136,300) 26.7
9: Install Automatic Valve on Unit Heater $600 $0 ($12,100) ($11,500) 20.2
10: Upgrade Exterior Lighting $2,600 ($3,200) ($16,900) ($17,500) 7.7
11: Optimize SF-5 (HS Classrooms) System $14,200 $3,400 ($101,400) ($83,800) 6.9
12: Optimize VU-2 (MS Classrooms) System $16,000 $3,400 ($98,600) ($79,200) 6.0
13: Install Electric Boilers $331,300 $13,600 ($1,575,500) ($1,230,600) 4.7
14: Isolate Lag Boiler $26,900 $8,200 ($132,500) ($97,400) 4.6
15: Optimize SF-3 (Science) System $17,800 $3,400 ($78,900) ($57,700) 4.2
16: Install Modulating Boiler Burners $44,400 $8,500 ($194,800) ($141,900) 4.2
17: Optimize SF-4 (Auditorium) System $78,100 $3,400 ($321,300) ($239,800) 4.1
18: Optimize SF-5 (MS Commons) System $13,300 $3,400 ($54,500) ($37,800) 3.8
19: Insulate Attic Ductwork $14,300 $0 ($52,300) ($38,000) 3.7
20: Optimize HRV-1 (Locker Rooms) System $37,300 $3,400 ($119,000) ($78,300) 3.1
Medium Priority EEM-
21: Install Setback Thermostats $13,900 $0 ($38,700) ($24,800) 2.8
22: Optimize SF-2 (HS Admin) System $16,000 $3,400 ($45,600) ($26,200) 2.6
23: Upgrade Motors to Premium Efficiency $2,600 $0 ($6,100) ($3,500) 2.3
24: Optimize SF-1 (HS Band, Library) System $69,300 $3,400 ($157,800) ($85,100) 2.2
25: Replace Door Glazing $6,700 $0 ($14,400) ($7,700) 2.1
26: Optimize VU-1 (HS Commons) System $58,600 $3,400 ($125,400) ($63,400) 2.1
27: Install Electric Hot Water Heaters $146,500 $0 ($294,600) ($148,100) 2.0
Totals* $918,700 $77,400 ($4,003,000) ($3,006,900) 4.3
*The analysis is based on each EEM being independent of the others. While it is likely that some
EEMs are interrelated, an isolated analysis is used to demonstrate the economics because the audit
team is not able to predict which EEMs an Owner may choose to implement. If several EEMs are
implemented, the resulting energy savings is likely to differ from the sum of each EEM projection.
Petersburg Middle & High School 5 Energy Audit (December 2011)
Summary
The energy audit revealed numerous opportunities for improving the energy performance of the
building. It is recommended that the behavioral and high priority EEMs be implemented now to
generate energy savings from which to fund the medium priority EEMs.
Another avenue to consider is to borrow money from AHFCs revolving loan fund for public
buildings. AHFC will loan money for energy improvements under terms that allow for paying back
the money from the energy savings. More information on this option can be found online at
http://www.ahfc.us/loans/akeerlf_loan.cfm.
Petersburg Middle & High School 6 Energy Audit (December 2011)
Section 2
Introduction
This report presents the findings of an energy audit of the Petersburg Middle School and High School
located in Petersburg, Alaska. The purpose of this investment grade energy audit is to evaluate the
infrastructure and its subsequent energy performance to identify applicable energy efficiencies
measures (EEMs).
The energy audit report contains the following sections:
Introduction: Building use and energy consumption.
Energy Efficiency Measures: Priority ranking of the EEMs with a description, energy
analysis, and life cycle cost analysis.
Description of Systems: Background description of the building energy systems.
Methodology: Basis for how construction and maintenance cost estimates are derived and
the economic and energy factors used for the analysis.
BUILDING USE
The Petersburg Middle School & High School is a 99,282 square foot building complex that contains
commons, classrooms, offices, a music room, a gym, a library, a wrestling room, an auditorium,
locker rooms, storage, mechanical support spaces, and a vocational education building.
The high school is operated by 48 staff and attended by 255 students. The facility is used in the
following manner:
Offices, Commons 7:00 am – 5:00 pm (M-F)
Classrooms 7:30 am – 4:00 pm (M-F)
Gym, Locker Rooms 8:00 am – 7:00 pm (M-F)
Auditorium 8:00 am – 4:00 pm (M-F)
12:00 pm – 2:00 pm (Sat – Sun)
Building History
1950 –High School Original Construction (Current Middle School)
1975 –High School Classroom and Gym Addition
1983 –High School Phase I (High School Addition)
1985 –High School Renovation Phase II ( Middle Renovation)
1990 –Community Gym (connected to school heating system)
2004 –High School Mechanical Renovation
Petersburg Middle & High School 7 Energy Audit (December 2011)
Energy Consumption
The building energy sources include two electric services (one to the school building and a second to
the Vocational Education Building) and a fuel oil tank. Fuel oil is the primary source for the majority
of the heating loads, including the Vocational Education Building, and domestic hot water while
electricity serves all other loads. The following table shows annual energy use and cost. It should be
noted that the fuel demand data includes use by the adjacent Petersburg Community Gym facility
which is supply by the school boilers.
Annual Energy Consumption and Cost
Source Consumption Cost Energy, MMBtu
Electricity 634,600 kWh $74,300 2,200 22%
Fuel Oil 56,053 Gallons $216,400 7,600 78%
Totals $290,700 9,800 100%
Electricity
This chart shows electrical energy use for the
main school building from 2007 to 2010. The
effective cost—energy costs plus demand
charges—is 11.7¢ per kWh.
This chart shows electrical energy use for the
Vocation Education Building from 2008 to
2011. The effective cost—energy costs plus
demand charges—is 14.1¢ per kWh
Petersburg Middle & High School 8 Energy Audit (December 2011)
Fuel Oil
This chart shows heating energy use from 2007 to
2010. The chart compares annual use with the
heating degree days which is a measurement of the
demand for energy to heat a building. A year with a
higher number of degree days reflects colder outside
temperatures and a higher heating requirement.
Cost of Heat Comparison
This chart shows a comparison of the current cost of
fuel oil heat and electric heat. The comparison is based
on a fuel oil conversion efficiency of 70% and an
electric boiler conversion efficiency of 95%. Electric
heat is currently less expensive than fuel oil heat.
Petersburg Middle & High School 9 Energy Audit (December 2011)
Section 3
Energy Efficiency Measures
The following energy efficiency measures (EEMs) were identified during the energy audit. The
EEMs are priority ranked and, where applicable, subjected to energy and life cycle cost analysis.
Appendix A contains the energy and life cycle cost analysis spreadsheets.
The EEMs are grouped into the following prioritized categories:
Behavioral or Operational: EEMs that require minimal capital investment but require
operational or behavioral changes. The EEMs provide a life cycle savings but an analysis is
not performed because the guaranteed energy savings is difficult quantify.
High Priority: EEMs that require a small capital investment and offer a life cycle savings.
Also included in this category are higher cost EEMs that offer significant life cycle savings.
Medium Priority: EEMs that require a significant capital investment to provide a life cycle
savings. Many medium priority EEMs provide a high life cycle savings and offer substantial
incentive to increase investment in building energy efficiency.
Low Priority: EEMs that will save energy but do not provide a life cycle savings.
BEHAVIORAL OR OPERATIONAL
The following EEMs are recommended for implementation. They require behavioral or operational
changes that can occur with minimal investment to achieve immediate savings. These EEMs are not
easily quantified by analysis because they cannot be accurately predicted. They are recommended
because they offer a life cycle savings, represent good practice, and are accepted features of high
performance buildings.
EEM-1: Weather-strip Doors
Purpose: The high school exterior steel doors do not seal and are missing weather stripping.
Energy will be saved if doors are properly weather-stripped to reduce infiltration.
Scope: Replace weather stripping on exterior doors.
EEM-2: Replace Broken Windows
Purpose: A 16” x 3’ window outside of the auditorium entrance has the outer glazing cracked, and
a 3’2” x 6’6” double pane window on the north side of the building has a broken outer
pane, with only a single pane remaining. Energy will be saved if the broken windows are
repaired with energy efficient double pane glazing units.
Scope: Repair broken windows with energy efficient double pane glazing units.
Petersburg Middle & High School 10 Energy Audit (December 2011)
EEM-3: Repair Inoperable Windows
Purpose: While many operable windows at the facility are damaged, most can be closed. Two
operable windows in the Home Economics classroom cannot be closed and remain open
year round.
Scope: Repair Home Economics windows.
EEM-4: Insulate Top of Wall Cavity Between High School & Middle School Walls
Purpose: The wall cavities of the middle school and high school adjoining walls are well insulated
with an open air space between them, however this open space between the walls is open
all the way up through the cold attic. This is visible from the middle school fan room
attic access. Energy will be saved if the top of this cavity is insulated to help retain the
heat between the walls.
Scope: Insulate the top of the cavity between the high school and middle school walls.
EEM-5: Insulate SF-5 Hot Deck Coil
Purpose: The hot deck heating coil for SF-5 is not insulated. Energy will be saved if the hot deck
coil is properly insulated.
Scope: Insulate the hot deck coil assembly of SF-5.
HIGH PRIORITY
The following EEMs are recommended for implementation because they are low cost measures that
have a high savings to investment ratio. The EEMs are listed from highest to lowest priority. Negative
values, in parenthesis, represent savings.
EEM-6: Replace Aerators and Showerheads
Purpose: Energy and water will be saved by replacing lavatory aerators and showerheads with
water-conserving fixtures.
Scope: Replace lavatory aerators and showerheads with water-conserving fixtures.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($12,440) ($12,440) $2,000 $0 ($352,700) ($350,700) 176.4
EEM-7: Perform Boiler Combustion Test
Purpose: Operating the boiler with an optimum amount of excess air will improve combustion
efficiency. Annual cleaning followed by a combustion test is recommended.
Scope: Annually clean and perform a combustion test on the boiler.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$960 ($2,290) ($1,330) $1,000 $16,300 ($64,900) ($47,600) 48.6
Petersburg Middle & High School 11 Energy Audit (December 2011)
EEM-8: Repair S-3 (Gym Mat Room) Outside Air Damper
Purpose: The S-3 system heats and ventilates the mat room. The outside air damper is stuck open
so the system is supplying 100% outside air. Energy will be saved if the outside air
damper is repaired.
Scope: Repair the outside air damper so it modulates properly.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$200 ($5,120) ($4,920) $5,300 $3,400 ($145,000) ($136,300) 26.7
EEM-9: Install Automatic Valve on Unit Heater
Purpose: Energy will be saved if the ceiling mounted unit heater in the boiler room has an
automatic valve that shuts off the heating flow when heat is not needed. Currently the
unit heater coil is continuously hot and the thermostat turns on the fan to supply heat to
the room. When heat is not needed, convective heat loss from the coil occurs; some of the
heat loss may be useful, but a large percentage is not.
Scope: Install an automatic valve in the heating supply to the unit heater and control it from the
fan thermostat.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($430) ($430) $600 $0 ($12,100) ($11,500) 20.2
EEM-10: Upgrade Exterior Lighting
Purpose: The exterior recessed fixtures use 100-watt high-pressure sodium lamps. Energy will be
saved if these fixtures are retrofitted for compact fluorescent lamps.
Scope: Retrofit the exterior recessed fixtures for compact fluorescent lamps.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
($190) ($860) ($1,050) $2,600 ($3,200) ($16,900) ($17,500) 7.7
Petersburg Middle & High School 12 Energy Audit (December 2011)
EEM-11: Optimize S-5 (HS Classrooms) System
Purpose: The S-5 system is a constant volume system serving the high school classrooms. The
system provides conditioned air during the normal operational schedule, after school
hours for activities, and as needed on weekends. The mixed air reset schedules supplies
cooler air than required for conditioning the spaces when outside temperatures are below
30°F. In addition, the schedule operates the system at nights and weekends when the
classrooms are not in use. This results in over-ventilation of the building. Energy will be
saved if the system is modified so it operates on the school schedule and the mixed air
temperature is increased during cold weather.
Scope: Perform the following modifications and retro-commission as a properly integrated
system when completed:
- Reduce run time on weekends.
- Modify mixed air reset schedule to reduce outside air flow during cold weather.
- Add a pressure sensor to modulate the exhaust air damper with room pressure.
EEM-12: Optimize VU-2 (MS Classrooms) System
Purpose: The VU-2 system is a constant volume system serving the middle school classrooms. The
system provides conditioned air during the normal operational schedule, after school
hours for activities, and as needed on weekends. The mixed air reset schedules supplies
cooler air than required for conditioning the spaces when outside temperatures are below
30°F. In addition, the schedule operates the system at nights and weekends when the
classrooms are not in use. This results in over-ventilation of the building. Energy will be
saved if the system is modified so it operates on the school schedule and the mixed air
temperature is increased during cold weather.
Scope: Perform the following modifications and retro-commission as a properly integrated
system when completed:
- Reduce run time on weekends.
- Modify mixed air reset schedule to reduce outside air flow during cold weather.
- Add a pressure sensor to modulate the exhaust air damper with room pressure.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$200 ($3,570) ($3,370) $16,000 $3,400 ($98,600) ($79,200) 6.0
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$200 ($3,660) ($3,460) $14,200 $3,400 ($101,400) ($83,800) 6.9
Petersburg Middle & High School 13 Energy Audit (December 2011)
EEM-13: Install Electric Boilers
Purpose: Due to the relatively inexpensive cost of hydroelectric power in Petersburg, heating with
electricity is less expensive than heating with fuel oil. Energy will be saved if the older
Cleaver Brooks fuel oil boiler is replaced with two electric boilers.
Scope: Replace the older fuel oil boiler with two electric boilers. The analysis for this EEM is
preliminary because the electric service requirements could not be determined without a
design effort. The analysis assumes a $75,000 cost for a new electric service for the
electric boiler.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$800 ($19,390) ($18,590) $331,300 $13,600 ($1,575,500) ($1,230,600) 4.7
EEM-14: Isolate Lag Boiler
Purpose: During periods when the outside temperature is warm enough that the primary boiler can
supply 100% of the facility heating demand, circulating hot water through the standby
boiler has a heat loss of 0.5% of the input rating of the boiler. Energy will be saved if
only a single boiler is on line when temperatures permit.
Scope: Shut down and isolate the lag boiler when only a single boiler is needed to supply the
heating load.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$480 ($4,670) ($4,190) $26,900 $8,200 ($132,500) ($97,400) 4.6
EEM-15: Optimize SF-3 (Science) System
Purpose: The SF-3 system is a constant volume system serving the adjacent science rooms. The
system supplies conditioned air during the normal operational schedule, after school
hours for activities, and as needed on weekends. The mixed air temperature reset
schedule for the system brings in more outside air than is required to ventilate the spaces.
Energy will be saved if the system is modified to reduce outside air flow.
Scope: Perform the following modifications and retro-commission as a properly integrated
system when completed:
- Reduce run time on weekends (currently 11 am to 3 pm).
- Increase mixed air temperature by modifying the reset schedule.
- Add a pressure sensor to modulate the exhaust air damper with room pressure.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$200 ($2,850) ($2,650) $17,800 $3,400 ($78,900) ($57,700) 4.2
Petersburg Middle & High School 14 Energy Audit (December 2011)
EEM-16: Install Modulating Boiler Burners
Purpose: The boiler burners do not incorporate modulating burner controls. Energy will be saved if
the boiler firing rate modulated as necessary.
Scope: Install modulating burners on the boilers.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$500 ($6,870) ($6,370) $44,400 $8,500 ($194,800) ($141,900) 4.2
EEM-17: Optimize SF-4 (Auditorium) System
Purpose: The SF-4 system is a constant volume system serving the auditorium. The space is
occupancy varies greatly throughout the school day and is unoccupied for many hours.
Many schools do not operate their auditorium systems throughout the school day because
the space use varies. Energy will be saved if the system ventilates the space and operates
only when the auditorium is in active use.
Scope: Perform the following modifications and retro-commission as a properly integrated
system when completed:
- Install VFDs to modulate the flow rate with cooling requirements.
- Add a CO2 sensor to modulate outside air flow.
- Keep the system in setback mode but increase the temperature during school hours so
the auditorium is warm when needed.
- Install occupancy sensors or manual controller to operate the fans only when the
room is occupied.
- Add a pressure sensor to modulate the exhaust air damper with room pressure.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$200 ($11,510) ($11,310) $78,100 $3,400 ($321,300) ($239,800) 4.1
Petersburg Middle & High School 15 Energy Audit (December 2011)
EEM-18: Optimize SF-5 (MS Commons) System
Purpose: The SF-5 system is a constant volume system serving the middle school commons. The
system provides conditioned air to the commons during the normal operational schedule,
after school hours for activities, and as needed on weekends. Under most conditions the
occupancy throughout the majority of these operational hours is well below the peak
design occupancy. This results in over-ventilation when the space is lightly used. Energy
will be saved if the system is modified to reduce air flow when not needed.
Scope: Perform the following modifications and retro-commission as a properly integrated
system when completed:
- Reduce run time on weekends.
- Add a CO2 sensor to modulate outside air flow.
- Add a pressure sensor to modulate the exhaust air damper with room pressure.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$200 ($1,950) ($1,750) $13,300 $3,400 ($54,500) ($37,800) 3.8
EEM-19: Insulate Attic Ductwork
Purpose: The VU-2 supply and return ductwork in the cold attic is uninsulated or minimally
insulated with duct liner. Energy will be saved if the ductwork is optimally insulated.
Scope: Properly insulate all uninsulated ductwork.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($1,840) ($1,840) $14,300 $0 ($52,300) ($38,000) 3.7
Petersburg Middle & High School 16 Energy Audit (December 2011)
EEM-20: Optimize HRV-1 (Locker Rooms) System
Purpose: The HRV-1 heats and ventilates the locker rooms with full outside air. During occupied
periods, there are many hours of the day when the locker rooms are lightly used.
Reducing the outside air flow when humidity is low will save energy. The system also
runs during unoccupied periods to ventilate the lockers and maintain a night setback
temperature. It is more energy efficient to purge the space in the morning and to modulate
outside air flow with humidity levels during night setback operation.
Energy will be saved by reducing the operating hours of the system and by modulating
outside air with humidity levels.
Scope: Modify the system and controls as follows and retro-commission as a properly integrated
system when completed:
- Reduce/eliminate weekend purge operation.
- Reduce defrost setpoint to 34°F.
- Install a return air damper and the dampers as required to maintain space humidity
setpoint.
- Program the system to operate in full recirculation mode during setback operation
with humidity override.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$200 ($4,230) ($4,030) $37,300 $3,400 ($119,000) ($78,300) 3.1
Petersburg Middle & High School 17 Energy Audit (December 2011)
MEDIUM PRIORITY
Medium priority EEMs will require planning and a higher level of investment. They are
recommended because they offer a life cycle savings. The EEMs are listed from highest to lowest
priority. Negative values, in parenthesis, represent savings.
EEM-21: Install Setback Thermostats
Purpose: The unit heaters in the Vocational Education building are controlled from thermostats
without setback capability. Energy will be saved if DDC thermostats are installed so they
can be setback through the DDC system.
Scope: Replace the unit heater thermostats with DDC thermostats and enable night setback of the
room temperature.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($1,360) ($1,360) $13,900 $0 ($38,700) ($24,800) 2.8
EEM-22: Optimize SF-2 (HS Admin) System
Purpose: The SF-2 system is a constant volume system serving the high school administration area.
The system provides conditioned air during the normal operational schedule, after school
hours for activities, and as needed on weekends. Under most conditions the occupancy
throughout the majority of these operational hours is well below the peak design
occupancy. This results in over-ventilation when the space is lightly used. Energy will be
saved if the system is modified to reduce outside air flow.
Scope: Perform the following modifications and retro-commission as a properly integrated
system when completed:
- Reduce run time on weekends (currently 11 am to 3 pm).
- Increase mixed air temperature by modifying the reset schedule.
- Reset hot deck temperature with outside temperature.
- Add a pressure sensor to modulate the exhaust air damper with room pressure.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$200 ($1,640) ($1,440) $16,000 $3,400 ($45,600) ($26,200) 2.6
EEM-23: Upgrade Motors to Premium Efficiency
Purpose: The equipment inspection identified two motors that could be upgraded with premium
efficiency models to save energy. They are:
- SF-1 7 ½ HP
- RF-2 1 ½ HP
Scope: Replace identified motors with premium efficiency motors.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($310) ($310) $2,600 $0 ($6,100) ($3,500) 2.3
Petersburg Middle & High School 18 Energy Audit (December 2011)
EEM-24: Optimize SF-1 (HS Band, Library) System
Purpose: The SF-1 system is a constant volume system serving the band/library area. The system
provides conditioned air during the normal operational schedule, after school hours for
activities, and as needed on weekends. Under most conditions the occupancy throughout
the majority of these operational hours is well below the peak design occupancy. This
results in over-ventilation and unnecessarily high air flow rates when the space is lightly
used. Energy will be saved if the system is modified to reduce air flow when not needed.
Scope: Perform the following modifications and retro-commission as a properly integrated
system when completed:
- Reduce run time on weekends (currently 11 am to 3 pm).
- Install VFDs to modulate the flow rate with cooling requirements.
- Add a CO2 sensor in the largest rooms to modulate outside air flow.
- Add a pressure sensor to modulate the exhaust air damper with room pressure.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$200 ($5,840) ($5,640) $69,300 $3,400 ($157,800) ($85,100) 2.2
EEM-25: Replace Door Glazing
Purpose: The main entry doors to the 1975 addition have single pane glazing. Energy will be
saved if the single pane glazing is removed and replaced with double pane glazing.
Scope: Replace single pane glazing with double pane glazing in main entry doors of the 1975
addition.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($510) ($510) $6,700 $0 ($14,400) ($7,700) 2.1
Petersburg Middle & High School 19 Energy Audit (December 2011)
EEM-26: Optimize VU-1 (HS Commons) System
Purpose: The VU-1 system is a constant volume system serving the high school commons. The
system provides conditioned air to the commons during the normal operational schedule,
after school hours for activities, and as needed on weekends. Under most conditions the
occupancy throughout the majority of these operational hours is well below the peak
design occupancy. This results in over-ventilation and unnecessarily high air flow rates
when the space is lightly used. Energy will be saved if the system is modified to reduce
air flow when not needed.
Scope: Perform the following modifications and retro-commission as a properly integrated
system when completed:
- Reduce run time on weekends (currently 11 am to 3 pm).
- Install VFDs to modulate the flow rate with cooling requirements.
- Add a CO2 sensor to modulate outside air flow.
- Add a pressure sensor to modulate the exhaust air damper with room pressure.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$200 ($4,610) ($4,410) $58,600 $3,400 ($125,400) ($63,400) 2.1
EEM-27: Install Electric Hot Water Heaters
Purpose: The fuel oil boilers are primarily operated through the summer to provide domestic hot
water. Due to the relatively inexpensive cost of hydroelectric power in Petersburg, the
cost of heating with electricity is less than heating with fuel oil. Energy will be saved if
the indirect hot water heaters are replaced with electric hot water heaters.
Scope: Replace indirect hot water heaters with electric hot water heaters and turn off the fuel oil
boilers in the summer.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($8,090) ($8,090) $146,500 $0 ($294,600) ($148,100) 2.0
Petersburg Middle & High School 20 Energy Audit (December 2011)
Section 4
Description of Systems
ENERGY SYSTEMS
This section provides a general description of the building systems. Energy conservation
opportunities are addressed in the Energy Efficiency Measure section of the report.
Building Envelope
R-value
Component Description (inside to outside) Existing Optimal
H.S. & M.S. Walls 5/8” Gyp. bd, 2”x6” metal stud, R-19 batt, 2” foam, stucco R-20 R-26
Gym & Class Walls 5/8” Gyp bd, 6” metal studs w/4” R-19 batt, metal siding R-10 R-26
Voc Ed Walls 5/8” Gyp bd, 2”x6” stud walls w/ R-19 batt, siding R-20 R-26
Gable Roof 2”x4” metal stud w/ R-38 batt R-38 R-46
Flat Roof pan decking/cement, 1/2” ply sheathing, 6” foam, EPDM R-30 R-46
Floor Slab 4” Concrete slab-on-grade R-10 R-10
Foundation 8” concrete R-5 R-20
Windows Aluminum double pane windows R-1.5 R-5
Doors Steel & Aluminum doors w/ non-thermally broken frames R-1.5 R-5
Heating System
The building is heated by two fuel oil boilers that provide heat to thirteen air handling unit systems,
fan coil units, domestic hot water heating systems, and perimeter hydronic systems. The heating
system has the following pumps:
P-1 & P-2 are building heating pumps.
P-7 is a domestic hot water heating pump.
P-10 is the middle school perimeter hydronic heating pump.
HWRP-A is a domestic hot water recirculating pump.
HWRP-B is a domestic hot water recirculating pump.
Petersburg Middle & High School 21 Energy Audit (December 2011)
Ventilation Systems
Area Fan
System
Description
HS Commons VU-1 7,550 cfm 5 HP constant volume air handling unit consisting of a
mixing box, filter section, primary heating coil, supply fan, and return
fan RF-4 (6,200 cfm 7 ½ HP constant volume fan)
HS Library/Music Room SF-1 10,150 cfm 7.5 HP constant volume air handling unit consisting of a
mixing box, filter section, primary heating coil, supply fan, and return
fan RF-1 (9,100 cfm 3 HP constant volume fan)
HS 1st Floor Classrooms SF-2 4,150 cfm 3 HP constant volume air handling unit consisting of a
mixing box, filter section, primary heating coil, supply fan, and return
fan RF-2 (3,500 cfm 1 ½ HP constant volume fan)
HS 2nd Floor Classrooms SF-3 7,500 cfm 7.5 HP constant volume air handling unit consisting of a
mixing box, filter section, primary heating coil, supply fan, and return
fan RF-3 (6,300 cfm 3 HP constant volume fan)
MS Classrooms VU-2 8400 cfm 5 HP constant volume air handling unit consisting of a
mixing box, filter section, primary heating coil, supply fan, and two
return fans RF-5 (6,170 cfm 1 ½ HP constant volume fan) and RF-6
(1,300 cfm 1/3 HP constant volume fan)
Auditorium SF-4 13,500 cfm 7.5 HP constant volume air handling unit consisting of a
mixing box, filter section, primary heating coil, supply fan, and return
fan RF-8 (12,700 cfm 5 HP constant volume fan)
MS Admin/Commons SF-5 5600 cfm 5 HP constant volume air handling unit consisting of a
mixing box, filter section, primary heating coil, supply fan, and return
fan RF-7 (5,000 cfm 1 ½ HP constant volume fan)
Gymnasium S-2 SF 22,000 cfm 15 Hp variable volume air handling unit consisting of a
mixing box, filter section, primary heating coil, supply fan, and return
fan S-2 RF (18,000 cfm 5 HP variable volume fan)
HS Mat Room S-3 3,250 cfm 1.5 HP constant volume air handling unit consisting of a
mixing box, filter section, primary heating coil, and supply fan
HS 1975 Classrooms S-5 SF 8,710 cfm 7 ½ constant volume air handling unit consisting of a
mixing box, filter section, primary heating coil, supply fan, and return
fan S-5 RF (7,400 cfm 3 HP constant volume fan)
Mechanical 2 SF-6 1,000 cfm ¼ HP 2-speed in-line fan
Gym Locker Room HRV-1 SF 1,695 cfm 1 ½ HP heat recovery ventilator
RF 2,780 cfm 2 HP heat
recovery ventilator
Vocational Education Bldg AHU-1 2,000 cfm 1 ½ HP constant volume air handling unit consisting of a
mixing box, filter section, primary heating coil, and supply fan
HS Toilets/Janitorial EF-1 1,350 cfm ½ HP constant volume exhaust air fan
HS Lounge/Toilet/Janitorial EF-2 515 cfm 1/4 constant volume exhaust air fan
HS Storage Room 205 EF-3 740 cfm 1/3 hp constant volume exhaust air fan
HS Chem 208 Fume Hood EF-4 780 cfm ½ hp constant volume exhaust air fan
MS Boiler Room EF-5 1,500 cfm 1/3 HP constant volume exhaust air fan
Petersburg Middle & High School 22 Energy Audit (December 2011)
Ventilation Systems - continued
Area Fan
System
Description
Greenhouse Room 203 EF-7 260 cfm 1/10 HP constant volume exhaust air fan
Auditorium EF-8 12,700 cfm 5 HP constant volume exhaust air fan
Darkrooms 251 a, b, c EF-9 350 cfm 1/6 HP constant volume exhaust air fan
Control Room 263 EF-10 300 cfm 1/6 HP constant volume exhaust air fan
Concessions 151 EF-11 150 cfm 1/6 HP constant volume exhaust air fan
Workroom 163 EF-12 200 cfm 1/6 HP constant volume exhaust air fan
Mechanical 2 EF-13 1,000 cfm ¼ HP constant volume exhaust air fan
Mat Room Exhaust E-2 3,090 cfm ½ HP constant volume exhaust air fan
Toilet Rooms E-3 545 cfm ¼ HP constant volume exhaust air fan
Welding Shop EF-1 1,680 cfm 3 HP constant volume exhaust air fan
Welding Shop EF-2 3,360 cfm 5 HP constant volume exhaust air fan
Welding Shop EF-3 3,360 cfm 5 HP constant volume exhaust air fan
Welding Shop EF-4 1,680 cfm 3 HP constant volume exhaust air fan
Woodshop Sawdust Collector DC-1 6,200 cfm 15 HP constant volume exhaust air fan
Domestic Hot Water System
The domestic hot water heating system consists of the following:
One 250-gallon indirect hot water heater in the boiler room that supplies the high school and
middle school.
Two Amtrol 120-gallon indirect hot water heaters that supply the locker rooms and adjacent
classrooms.
Automatic Control System
The building has a DDC system to control the heating and ventilation systems at the system level.
The zone level controllers are pneumatic. Energy will be saved through further optimization of fan
system scheduling and control sequences.
Lighting
Interior lighting primarily consists of T12 fluorescent fixtures throughout the school and metal halide
pendant fixtures in the gymnasium and commons area. Exterior lighting primarily consists of high
pressure sodium and compact fluorescent fixtures.
Electric Equipment
Large wood working, welding, and other shop equipment are located in the Vocational Education
Building.
Petersburg Middle & High School 23 Energy Audit (December 2011)
Section 5
Methodology
Information for the energy audit was gathered through on-site observations, review of construction
documents, and interviews with operation and maintenance personnel. The EEMs are evaluated using
energy and life cycle cost analyses and are priority ranked for implementation.
Energy Efficiency Measures
Energy efficiency measures are identified by evaluating the building’s energy systems and comparing
them to systems in modern, high performance buildings. The process for identifying the EEMs
acknowledges the realities of an existing building that was constructed when energy costs were much
lower. Many of the opportunities used in modern high performance buildings—highly insulated
envelopes, variable capacity mechanical systems, heat pumps, daylighting, lighting controls, etc.—
simply cannot be economically incorporated into an existing building.
The EEMs represent practical measures to improve the energy efficiency of the buildings, taking into
account the realities of limited budgets. If a future major renovation project occurs, additional EEMs
common to high performance buildings should be incorporated.
Life Cycle Cost Analysis
The EEMs are evaluated using life cycle cost analysis which determines if an energy efficiency
investment will provide a savings over a 25-year life. The analysis incorporates construction,
replacement, maintenance, repair, and energy costs to determine the total cost over the life of the
EEM. Future maintenance and energy cash flows are discounted to present worth using escalation
factors for general inflation, energy inflation, and the value of money. The methodology is based on
the National Institute of Standards and Technology (NIST) Handbook 135 – Life Cycle Cost
Analysis.
Life cycle cost analysis is preferred to simple payback for facilities that have long—often perpetual—
service lives. Simple payback, which compares construction cost and present energy cost, is
reasonable for short time periods of 2-4 years, but yields below optimal results over longer periods
because it does not properly account for the time value of money or inflationary effects on operating
budgets. Accounting for energy inflation and the time value of money properly sums the true cost of
facility ownership and seeks to minimize the life cycle cost.
Construction Costs
The cost estimates are derived based on a preliminary understanding of the scope of each EEM as
gathered during the walk-through audit. The construction costs for in-house labor are $60 per hour for
work typically performed by maintenance staff and $110 per hour for contract labor.
The cost estimate assumes the work will be performed as part of a larger renovation or energy
efficiency upgrade project. When implementing EEMs, the cost estimate should be revisited once the
scope and preferred method of performing the work has been determined. It is possible some EEMs
will not provide a life cycle savings when the scope is finalized.
Petersburg Middle & High School 24 Energy Audit (December 2011)
Maintenance Costs
Maintenance costs are based on in-house or contract labor using historical maintenance efforts and
industry standards. Maintenance costs over the 25-year life of each EEM are included in the life cycle
cost calculation spreadsheets and represent the level of effort to maintain the systems.
Energy Analysis
The energy performance of an EEM is evaluated within the operating parameters of the building. A
comprehensive energy audit would rely on a computer model of the building to integrate building
energy systems and evaluate the energy savings of each EEM. This investment grade audit does not
utilize a computer model, so energy savings are calculated with factors that account for the dynamic
operation of the building. Energy savings and costs are estimated for the 25-year life of the EEM
using appropriate factors for energy inflation.
Prioritization
Each EEM is prioritized based on the life cycle savings to investment ratio (SIR) using the following
formula:
Prioritization Factor = Life Cycle Savings / Capital Costs
This approach factor puts significant weight on the capital cost of an EEM, making lower cost EEMs
more favorable.
Economic Factors
The following economic factors are significant to the findings.
Nominal Interest Rate: This is the nominal rate of return on an investment without regard to inflation.
The analysis uses a rate of 5%.
Inflation Rate: This is the average inflationary change in prices over time. The analysis uses an
inflation rate of 2%.
Economic Period: The analysis is based on a 25-year economic period with construction beginning in
2010.
Fuel Oil
Fuel oil currently costs $3.86 per gallon for a seasonally adjusted blend of #1 and #2 fuel oil. The
analysis is based on 6% fuel oil inflation which has been the average for the past 20-years.
Petersburg Middle & High School 25 Energy Audit (December 2011)
Electricity
Electricity is supplied by Petersburg Municipal Light & Power. The building is billed for
electricity under their General Service rate. Electric inflation has historically been less than 1%
per year. As fuel oil costs increase, electric heating conversions will continue to create load
growth, raising the cost of supplying power. As such, the analysis assumes electric inflation of
3% per year.
General Service
Electricity ($ / kWh ) Block Rate
1st Block 30,000 $0.108
2nd Block 60,000 $0.106
Remaining $0.081
Demand ( $ / kW ) $3.10
Customer Charge $28.00
Summary
The following table summarizes the energy and economic factors used in the analysis.
Summary of Economic and Energy Factors
Factor Rate or Cost Factor Rate or Cost
Nominal Discount Rate 5% Electricity 11.7¢/kWh
General Inflation Rate 2% Electricity Inflation 3%
Fuel Oil Cost (2012) $3.86/gal Fuel Oil Inflation 6%
Petersburg Middle & High School 26 Energy Audit (December 2011)
Appendix A
Energy and Life Cycle Cost Analysis
Petersburg Middle & High School 27 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
Basis
Economic
Study Period (years) 25 Nominal Discount Rate 5%General Inflation 2%
Energy
2011 $/gal Fuel Inflation 2012 $/gal
Fuel Oil $3.86 6% $4.09
Electricity $/kWh (2011)$/kW (2011)Inflation $/kWh (2012)$/kW (2012)
w/ Demand Charges $0.106 $3.10 3% $0.109 $3.19
w/o Demand Charges $0.117 -3% $0.121 -
EEM-6: Replace Aerators and Showerheads
Energy Analysis
η boiler 68%
Fixture Existing Proposed Uses/day Days Water,Gals % HW kBTU Gallons
Showerhead 20 10 25 180 -45,000 80% -24,019 -255
Lavatories 0.3 0.2 600 180 -19,440 80% -10,376 -3,041
-64,440 -3,041
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace lavatory aerators 0 24 ea $35 $840
Replace showerhead 0 32 ea $35 $1,120
Energy Costs
Fuel Oil 1 - 25 -3,041 gal $4.09 ($352,692)
Net Present Worth ($350,700)
EEM-7: Perform Boiler Combustion Test
Energy Analysis
Annual Gal % Savings Savings, Gal
56,000 -1.0% -560
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Purchase combustion analyzer 0 1 LS $1,000 $1,000
Annual Costs
Combustion test 1 - 25 16 hrs $60.00 $16,346
Energy Costs
Fuel Oil 1 - 25 -560 gal $4.09 ($64,946)
Net Present Worth ($47,600)
Gallons per Use
Petersburg Middle & High School 28 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-8: Repair S-3 (Mat Room) Outside Air Damper
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
S-3 Existing -3,250 1.50 55%-1 87%-1 1,332 -1,593
Optimized 3,250 1.50 55%1 87%1 1,260 1,507
0 -86
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
S-3 Existing -3,250 40 68 -98 1,332 -130,909 68%-1,390
Optimized 3,250 65 68 11 1,260 13,268 68%141
-117,641 -1,249
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Repair outside air damper 0 1 ea $1,000 $1,000
Retro-commission 0 1 ea $2,000 $2,000
Estimating contingency 0 15%$450
Overhead & profit 0 30%$1,035
Design fees 0 10%$449
Project management 0 8%$395
Annual Costs
DDC Maintenance 1 - 25 1 LS $200.00 $3,405
Energy Costs
Electric Energy 1 - 25 -86 kWh $0.109 ($185)
Electric Demand 1 - 25 0 kW $3.19 $0
Fuel Oil 1 - 25 -1,249 gal $4.09 ($144,865)
Net Present Worth ($136,300)
EEM-9: Install Automatic Valve on Unit Heater
Energy Analysis
Loss, BTUH Number Factor Loss, kBTU Boiler Effic Fuel, gals
-1,500 1 75% -9,855 70% -104
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install automatic valve and connect to fan wiring 0 1 ea $500 $500
Estimating contingency 0 15%$75
Energy Costs
Fuel Oil 1 - 25 -104 gal $4.09 ($12,094)
Net Present Worth ($11,500)
Petersburg Middle & High School 29 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-10: Upgrade Exterior Lighting
Energy Analysis
Type # Fixtures Lamp Lamp, watts Fixture Watts Lamp Lamp, watts Fixture Watts Savings, kWh
WallPak 26 MH 100 95 CFL -26 -7,858
Lamp Replacement
Type # Fixtures Lamp # Lamps Life, hrs Lamps//yr $ / lamp $ / Replace
Canopy 26 MH -1 12,000 -9.49 $42 $20
Canopy 26 CFL 1 8,000 14.24 $8 $20
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Retrofit fixture for CFL 0 26 LS $100 $2,600
Annual Costs
Existing lamp replacement, 100 watt MH 1 - 25 -9.49 lamps $62.00 ($10,018)
CFL replacement, 26 watts 1 - 25 14.24 lamps $28.00 $6,787
Energy Costs
Electric Energy 1 - 25 -7,858 kWh $0.109 ($16,864)
Net Present Worth ($17,500)
EEM-11: Optimize SF-5 (HS Classrooms) System
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
S-5 SF Existing -8,710 1.68 55%-4 91%-3 2,520 -8,622
Optimized 8,710 1.68 55%4 91%3 1,980 6,774
S-5 RF Existing -7,400 0.75 55%-2 89%-1 2,520 -3,353
Optimized 7,400 0.75 55%2 89%1 1,980 2,635
0 -2,566
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
S-5 SF Existing -8,710 60 68 -75 2,520 -189,641 68%-2,014
Optimized 8,710 62 68 56 1,980 111,753 68%1,187
-77,888 -827
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Revise controls 0 1 ea $5,000 $5,000
Retro-commission 0 1 ea $3,000 $3,000
Estimating contingency 0 15%$1,200
Overhead & profit 0 30%$2,760
Design fees 0 10%$1,196
Project management 0 8%$1,052
Annual Costs
DDC Maintenance 1 - 25 1 LS $200.00 $3,405
Energy Costs
Electric Energy 1 - 25 -2,566 kWh $0.109 ($5,507)
Electric Demand 1 - 25 0 kW $3.19 $0
Fuel Oil 1 - 25 -827 gal $4.09 ($95,913)
Net Present Worth ($83,800)
Existing Replacement
Petersburg Middle & High School 30 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-12: Optimize VU-2 (MS Classrooms) System
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
VU-2 Existing -8,400 1.40 55%-3 89%-3 2,520 -7,106
Optimized 7,500 1.40 55%3 89%3 1,980 4,985
RF-5/6 Existing -7,472 0.60 55%-1 87%-1 2,520 -2,771
Optimized 7,472 0.60 55%1 87%1 1,980 2,177
0 -2,715
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
VU-2 Existing -8,400 60 68 -73 2,520 -182,892 68%-1,942
Optimized 8,400 62 68 54 1,980 107,775 68%1,144
-75,116 -798
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Revise controls 0 1 ea $6,000 $6,000
Retro-commission 0 1 ea $3,000 $3,000
Estimating contingency 0 15%$1,350
Overhead & profit 0 30%$3,105
Design fees 0 10%$1,346
Project management 0 8%$1,184
Annual Costs
DDC Maintenance 1 - 25 1 LS $200.00 $3,405
Energy Costs
Electric Energy 1 - 25 -2,715 kWh $0.109 ($5,826)
Electric Demand 1 - 25 -4 kW $3.19 ($228)
Fuel Oil 1 - 25 -798 gal $4.09 ($92,499)
Net Present Worth ($79,200)
Petersburg Middle & High School 31 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-13: Install Electric Boilers
Energy Analysis
Fuel Oil Boilers
Annual Gal η boiler Heat kBtu % Fuel Oil Boiler kBtu η boiler Annual Gal Savings, gal
56,000 68% 5,274,080 40% 2,109,632 68% 22,400 -33,600
Electric Boiler
% Electric kBtu η boiler kWh
60% 3,164,448 95% 976,260
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install electric boiler 0 2 ea $35,000 $70,000
Primary pumps 0 2 ea $5,000 $10,000
Piping and appurtenances 0 1 ea $20,000 $20,000
Controls 0 1 ea $20,000 $20,000
Electric service 0 1 ea $75,000 $75,000
Estimating contingency 0 10% $19,500
Overhead & profit 0 30% $64,350
Design fees 0 10% $27,885
Project management 0 8% $24,539
Annual Costs
Electric boiler maintenance 1 - 25 2 ea $200.00 $6,811
Pump maintenance 1 - 25 2 ea $200.00 $6,811
Energy Costs
Electric Energy 1 - 25 976,260 kWh $0.109 $2,095,268
Electric Demand 1 - 25 3,600 kW $3.19 $225,961
Fuel Oil 1 - 25 -33,600 gal $4.09 ($3,896,744)
Net Present Worth ($1,230,600)
EEM-14: Isolate Lag Boiler
Energy Analysis
Boiler Input MBH Loss %Loss MBH Hours, exist Hours, new kBtu η boiler Gallons
B-2 4,981 0.50% 25 6,480 2,160 -107,589 68%-1,142
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install automatic valve 0 1 ea $8,000 $8,000
Controls 0 1 ea $10,000 $10,000
Estimating contingency 0 15%$2,700
Overhead & profit 0 30%$6,210
Annual Costs
Operate boiler annually 1 - 25 8 hrs $60.00 $8,173
Energy Costs
Fuel Oil 1 - 25 -1,142 gal $4.09 ($132,486)
Net Present Worth ($97,400)
Petersburg Middle & High School 32 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-15: Optimize SF-3 (Science) System
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
SF-3 Existing -7,500 1.75 55%-4 89%-3 2,396 -7,540
Optimized 7,500 1.75 55%4 89%3 1,980 6,231
RF-3 Existing -6,300 1.00 55%-2 87%-2 2,396 -3,703
Optimized 6,300 1.00 55%2 87%2 1,980 3,060
0 -1,952
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
SF-3 Existing -7,500 60 68 -65 2,396 -155,261 68%-1,649
Optimized 7,500 62 68 48 1,980 94,624 68%1,005
-60,637 -644
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Revise controls 0 1 ea $6,000 $6,000
Retro-commission 0 1 ea $4,000 $4,000
Estimating contingency 0 15%$1,500
Overhead & profit 0 30%$3,450
Design fees 0 10%$1,495
Project management 0 8%$1,316
Annual Costs
DDC Maintenance 1 - 25 1 LS $200.00 $3,405
Energy Costs
Electric Energy 1 - 25 -1,952 kWh $0.109 ($4,189)
Electric Demand 1 - 25 0 kW $3.19 $0
Fuel Oil 1 - 25 -644 gal $4.09 ($74,669)
Net Present Worth ($57,700)
EEM-16: Install Modulating Boiler Burners
Energy Analysis
Annual Gal % Savings Savings, Gal
56,000 -3.0% -1,680
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install modulating burner 0 1 LS $25,000 $25,000
Estimating contingency 0 15%$3,750
Overhead & profit 0 30%$8,625
Design fees 0 10%$3,738
Project management 0 8%$3,289
Annual Costs
Burner maintenance 1 - 25 1 LS $500.00 $8,514
Energy Costs
Fuel Oil 1 - 25 -1,680 gal $4.09 ($194,837)
Net Present Worth ($141,900)
Petersburg Middle & High School 33 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-17: Optimize SF-4 (Auditorium) System
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
SF-4 Existing -13,500 1.50 55%-6 89%-5 1,980 -9,614
Optimized 13,500 1.50 55%6 89%5 1,260 6,118
RF-8 Existing -12,700 0.75 55%-3 89%-2 1,980 -4,522
Optimized 12,700 0.75 55%3 89%2 1,260 2,878
0 -5,140
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
SF-4 Existing -13,500 60 70 -146 1,980 -288,684 68%-3,065
Optimized 13,500 68 70 29 1,260 36,742 68%390
-251,942 -2,675
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Revise controls 0 1 ea $20,000 $20,000
Install VFD 0 2 ea $10,000 $20,000
Retro-commission 0 1 ea $4,000 $4,000
Estimating contingency 0 15%$6,600
Overhead & profit 0 30% $15,180
Design fees 0 10%$6,578
Project management 0 8%$5,789
Annual Costs
DDC Maintenance 1 - 25 1 LS $200.00 $3,405
Energy Costs
Electric Energy 1 - 25 -5,140 kWh $0.109 ($11,032)
Electric Demand 1 - 25 0 kW $3.19 $0
Fuel Oil 1 - 25 -2,675 gal $4.09 ($310,245)
Net Present Worth ($239,700)
Petersburg Middle & High School 34 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-18: Optimize SF-5 (MS Commons) System
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
SF-5 Existing -5,600 1.88 55%-3 89%-3 1,980 -4,985
Optimized 5,600 1.88 55%3 89%3 1,750 4,406
RF-7 Existing -5,000 0.75 55%-1 87%-1 1,980 -1,821
Optimized 5,000 0.75 55%1 87%1 1,750 1,610
0 -791
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
SF-5 Existing -5,600 60 68 -48 1,980 -95,800 68%-1,017
Optimized 5,600 63 68 30 1,750 52,920 68%562
-42,880 -455
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Revise controls 0 1 ea $3,500 $3,500
Retro-commission 0 1 ea $4,000 $4,000
Estimating contingency 0 15%$1,125
Overhead & profit 0 30%$2,588
Design fees 0 10%$1,121
Project management 0 8%$987
Annual Costs
DDC Maintenance 1 - 25 1 LS $200.00 $3,405
Energy Costs
Electric Energy 1 - 25 -791 kWh $0.109 ($1,697)
Electric Demand 1 - 25 0 kW $3.19 $0
Fuel Oil 1 - 25 -455 gal $4.09 ($52,803)
Net Present Worth ($37,800)
EEM-19: Insulate Attic Ductwork
Energy Analysis
Unit CFM ΔT MBH Hours kBtu η boiler Gallons
VU-2 8,400 -2 -18 2,340 -42,457 68% -451
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Insulate 12x12 0 200 lnft $16 $3,200
Insulate 16x16 0 146 lnft $22 $3,212
Insulate 24x24 0 52 lnft $32 $1,664
Estimating contingency 0 15%$1,211
Overhead & profit 0 30%$2,786
Design fees 0 10%$1,207
Project management 0 8%$1,062
Energy Costs
Fuel Oil 1 - 25 -451 gal $4.09 ($52,282)
Net Present Worth ($37,900)
Petersburg Middle & High School 35 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-20: Optimize HRV-1 (Locker Rooms) System
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
HRV-1 SF Existing -1,695 2.00 55%-1 87%-1 2,466 -2,051
Optimized 1,695 2.00 55%1 87%1 2,124 1,766
HRV-1 RF Existing -2,780 2.20 55%-2 89%-1 2,466 -3,616
Optimized 2,780 2.20 55%2 89%1 2,124 3,115
0 -786
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
HRV-1 SF Existing -1,695 40 68 -51 2,466 -126,399 68%-1,342
Optimized 1,695 60 68 15 2,124 31,106 68%330
-95,294 -1,012
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Revise controls 0 1 ea $8,000 $8,000
Install RAD and ductwork 0 1 ea $10,000 $10,000
Retro-commission 0 1 ea $3,000 $3,000
Estimating contingency 0 15%$3,150
Overhead & profit 0 30%$7,245
Design fees 0 10%$3,140
Project management 0 8%$2,763
Annual Costs
DDC Maintenance 1 - 25 1 LS $200.00 $3,405
Energy Costs
Electric Energy 1 - 25 -786 kWh $0.109 ($1,687)
Electric Demand 1 - 25 0 kW $3.19 $0
Fuel Oil 1 - 25 -1,012 gal $4.09 ($117,346)
Net Present Worth ($78,300)
EEM-21: Install Setback Thermostats
Energy Analysis
Gallons ΔT, ex ΔT, proposed Savings
3,000 30 27 -333
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install DDC thermostats and controls 0 6 ea $1,500 $9,000
Overhead & profit 0 30%$2,700
Design fees 0 10%$1,170
Project management 0 8%$1,030
Energy Costs
Fuel Oil 1 - 25 -333 gal $4.09 ($38,658)
Net Present Worth ($24,800)
Petersburg Middle & High School 36 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-22: Optimize SF-2 (HS Admin) System
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
SF-2 Existing -4,150 1.75 55%-2 89%-2 2,396 -4,172
Optimized 4,150 1.75 55%2 89%2 1,980 3,448
RF-2 Existing -3,500 0.75 55%-1 87%-1 2,396 -1,543
Optimized 3,500 0.75 55%1 87%1 1,980 1,275
0 -992
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
SF-2 Existing -4,150 60 68 -36 2,396 -85,911 68%-912
Optimized 4,150 62.3 68 26 1,980 50,584 68%537
-35,327 -375
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Revise controls 0 1 ea $5,000 $5,000
Retro-commission 0 1 ea $4,000 $4,000
Estimating contingency 0 15%$1,350
Overhead & profit 0 30%$3,105
Design fees 0 10%$1,346
Project management 0 8%$1,184
Annual Costs
DDC Maintenance 1 - 25 1 LS $200.00 $3,405
Energy Costs
Electric Energy 1 - 25 -992 kWh $0.109 ($2,130)
Electric Demand 1 - 25 0 kW $3.19 $0
Fuel Oil 1 - 25 -375 gal $4.09 ($43,502)
Net Present Worth ($26,200)
EEM-23: Upgrade Motors to Premium Efficiency
Energy Analysis
Equip Number HP ηold ηnew kW Hours kWh
RF-2 1 1.5 78.0% 86.5% -0.10 3,200 -304
SF-1 1 7.5 79.0% 91.7% -0.71 3,200 -2,274
-0.8 -2,578
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs HP
Replace motor 1.5 0 1 LS 955 $955
Replace motor 7.5 0 1 LS 1,690 $1,690
Energy Costs
Electric Energy 1 - 25 -2,578 kWh $0.109 ($5,533)
Electric Demand 1 - 25 -10 kW $3.19 ($607)
Net Present Worth ($3,500)
Petersburg Middle & High School 37 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-24: Optimize SF-1 (HS Band, Library) System
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
SF-1 Existing -10,150 1.65 55%-5 91%-4 2,396 -9,410
Optimized 7,500 1.40 55%3 91%2 1,980 4,875
RF-4 Existing -9,100 0.75 55%-2 87%-2 2,396 -4,011
Optimized 6,500 0.40 55%1 87%1 1,980 1,263
-3 -7,283
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
SF-1 Existing -10,150 60 68 -88 2,396 -210,120 68%-2,231
Optimized 7,500 62 68 49 1,980 96,228 68%1,022
-113,892 -1,209
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Revise controls 0 1 ea $20,000 $20,000
Install VFD 0 2 ea $7,500 $15,000
Retro-commission 0 1 ea $4,000 $4,000
Estimating contingency 0 15%$5,850
Overhead & profit 0 30% $13,455
Design fees 0 10%$5,831
Project management 0 8%$5,131
Annual Costs
DDC Maintenance 1 - 25 1 LS $200.00 $3,405
Energy Costs
Electric Energy 1 - 25 -7,283 kWh $0.109 ($15,631)
Electric Demand 1 - 25 -30 kW $3.19 ($1,884)
Fuel Oil 1 - 25 -1,209 gal $4.09 ($140,248)
Net Present Worth ($85,100)
EEM-25: Replace Door Glazing
Energy Analysis
Component Area R,exist R,new ΔT MBH kBtu η boiler Gallons
Door 50 0.75 2.25 30 -1.3 -11,680 68%-124
-1.3 -11,680 -124
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace door glazing unit 0 50 sqft $75 $3,750
Estimating contingency 0 15%$563
Overhead & profit 0 30%$1,294
Design fees 0 10%$561
Project management 0 8%$493
Energy Costs
Fuel Oil 1 - 25 -124 gal $4.09 ($14,383)
Net Present Worth ($7,700)
Petersburg Middle & High School 38 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-26: Optimize VU-1 (HS Commons) System
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
VU-1 Existing -7,550 1.65 55%-4 89%-3 2,396 -7,157
Optimized 6,000 1.25 55%2 89%2 1,980 3,561
RF-4 Existing -6,200 0.75 55%-1 87%-1 2,396 -2,733
Optimized 5,500 0.50 55%1 87%1 1,980 1,336
-2 -4,993
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
VU-1 Existing -7,550 60 68 -65 2,396 -156,296 68%-1,660
Optimized 6,000 63 68 32 1,980 64,152 68%681
-92,144 -978
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Revise controls 0 1 ea $15,000 $15,000
Install VFD 0 2 ea $7,500 $15,000
Retro-commission 0 1 ea $3,000 $3,000
Estimating contingency 0 15%$4,950
Overhead & profit 0 30% $11,385
Design fees 0 10%$4,934
Project management 0 8%$4,341
Annual Costs
DDC Maintenance 1 - 25 1 LS $200.00 $3,405
Energy Costs
Electric Energy 1 - 25 -4,993 kWh $0.109 ($10,717)
Electric Demand 1 - 25 -20 kW $3.19 ($1,246)
Fuel Oil 1 - 25 -978 gal $4.09 ($113,467)
Net Present Worth ($63,400)
Petersburg Middle & High School 39 Energy Audit (December 2011)
Alaska Energy Engineering LLC Energy and Life Cycle Cost Analysis
25200 Amalga Harbor Road Tel/Fax: 907.789.1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Building Name
EEM-27: Install Electric Hot Water Heaters
Energy Analysis
Fuel Oil
Boiler Input MBH Loss %Loss MBH Hours, exist Hours, new kBtu η boiler Gallons
B-1 3,988 1.0% 40 8,760 6,480 -90,926 68%-965
B-2 4,981 1.0% 50 8,760 6,480 -113,567 68%-1,206
Fixture Occupants gal/person Days Water,Gals % HW kBTU η boiler
School 300 -3 180 -162,000 80% -86,469 68%-918
Gym 75 -5 340 -127,500 80% -68,054 68%-723
-289,500 -154,524 -3,812
Electricity
Fixture Occupants gal/person Days Water,Gals % HW kBTU η HW heater Gallons
School 300 3 180 162,000 80% 86,469 95%26,676
Gym 75 5 340 127,500 80% 68,054 95%20,995
289,500 154,524 47,672
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install electric hot water heater 0 3 ea $20,000 $60,000
Electric service 0 3 ea $7,500 $22,500
Estimating contingency 0 15% $12,375
Overhead & profit 0 30% $28,463
Design fees 0 10% $12,334
Project management 0 8% $10,854
Energy Costs
Electric Energy 1 - 25 47,672 kWh $0.109 $102,314
Electric Demand 1 - 25 720 kW $3.19 $45,192
Fuel Oil 1 - 25 -3,812 gal $4.09 ($442,098)
Net Present Worth ($148,100)
Petersburg Middle & High School 40 Energy Audit (December 2011)
Appendix B
Energy and Utility Data
Petersburg Middle & High School 41 Energy Audit (December 2011)
Alaska Energy Engineering LLC Billing Data
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Petersburg Middle/High School
ELECTRIC RATE
Electricity ($ / kWh )Block Rate Demand ( $ / kW )
1st Block 30,000 $0.108 All kW $3.10
2nd Block 60,000 $0.106
Remaining $0.081
Customer Charge $28.00
ELECTRICAL CONSUMPTION AND DEMAND
kWh kW kWh kW kWh kW kWh kW
Jan 59,200 216 58,400 200 54,400 200 54,400 192 56,600
Feb 62,400 200 65,600 192 62,400 184 67,200 200 64,400
Mar 54,400 208 54,400 184 50,400 184 50,400 192 52,400
Apr 60,800 208 52,000 208 57,600 176 55,200 192 56,400
May 56,800 200 53,600 104 49,600 120 56,800 200 54,200
Jun 40,000 184 44,000 128 59,200 112 46,400 184 47,400
Jul 34,400 104 37,600 176 43,200 176 34,400 112 37,400
Aug 36,800 144 37,600 192 38,400 192 39,200 128 38,000
Sep 52,800 184 49,600 192 55,200 200 56,000 176 53,400
Oct 53,600 192 53,600 284 54,400 208 60,000 200 55,400
Nov 61,600 192 56,800 208 57,600 184 67,200 200 60,800
Dec 62,400 208 56,000 200 59,200 200 55,200 208 58,200
Total 635,200 619,200 641,600 642,400 634,600
Average 52,933 187 51,600 189 53,467 178 53,533 182 52,883
Load Factor 38.8% 37.4% 41.1% 40.3% 184
ELECTRIC BILLING DETAILS
Month Energy Demand Total Energy Demand Total % Change
Jan $5,826 $620 $6,474 $5,826 $595 $6,450 -0.4%
Feb $6,614 $570 $7,213 $7,003 $620 $7,651 6.1%
Mar $5,402 $570 $6,001 $5,402 $595 $6,026 0.4%
Apr $6,166 $546 $6,739 $5,911 $595 $6,534 -3.0%
May $5,318 $372 $5,718 $6,081 $620 $6,729 17.7%
Jun $6,335 $347 $6,710 $4,978 $570 $5,577 -16.9%
Jul $4,639 $546 $5,213 $3,706 $347 $4,082 -21.7%
Aug $4,130 $595 $4,754 $4,215 $397 $4,640 -2.4%
Sep $5,911 $620 $6,559 $5,996 $546 $6,570 0.2%
Oct $5,826 $645 $6,499 $6,420 $620 $7,068 8.8%
Nov $6,166 $570 $6,764 $7,003 $620 $7,651 13.1%
Dec $6,335 $620 $6,983 $5,911 $645 $6,584 -5.7%
Total $ 68,670 $ 6,622 $ 75,627 $ 68,454 $ 6,770 $ 75,561 -0.1%
Average $ 5,722 $ 552 $ 6,274 $ 5,705 $ 564 $ 6,269 -0.1%
Cost ($/kWh) $0.117 91% 9% $0.117 -0.2%
2009 2010
Electrical costs are based on the current electric rates.
2010
General Service
Month 2007 2008 2009 Average
Petersburg Middle & High School 42 Energy Audit (December 2011)
Alaska Energy Engineering LLC Billing Data
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Petersburg Vocational Education Building
ELECTRIC RATE
Electricity ($ / kWh )Block Rate Demand ( $ / kW )
1st Block 30,000 $0.108 All kW $3.10
2nd Block 60,000 $0.106
Remaining $0.081
Customer Charge $28.00
ELECTRICAL CONSUMPTION AND DEMAND
kWh kW kWh kW kWh kW kWh kW
Jan 5,800 40 4,000 38 4,400 50 4,000 38 4,550
Feb 7,200 48 5,400 44 6,000 48 5,000 44 5,900
Mar 4,600 44 4,000 38 4,000 44 3,600 40 4,050
Apr 4,600 42 4,800 38 5,800 40 4,400 42 4,900
May 6,000 48 4,000 44 5,000 42 4,600 44 4,900
Jun 2,800 32 3,200 38 3,000 40 2,000 30 2,750
Jul 1,400 26 2,200 20 1,800 24 1,400 14 1,700
Aug 2,000 22 3,200 18 1,800 24 1,600 30 2,150
Sep 5,000 44 4,200 44 4,200 48 1,600 30 3,750
Oct 4,400 36 4,600 44 5,000 50 1,600 30 3,900
Nov 4,800 46 4,800 42 4,600 48 4,900 40 4,775
Dec 5,000 42 5,600 52 4,000 42 4,900 41 4,875
Total 53,600 50,000 49,600 39,600 48,200
Average 4,467 39 4,167 38 4,133 42 3,300 35 4,017
Load Factor 15.6% 14.9% 13.6% 12.8% 39
ELECTRIC BILLING DETAILS
Month Energy Demand Total Energy Demand Total % Change
Jan $475 $155 $658 $432 $118 $578 -12.2%
Feb $648 $149 $825 $540 $136 $704 -14.6%
Mar $432 $136 $596 $389 $124 $541 -9.3%
Apr $626 $124 $778 $475 $130 $633 -18.6%
May $540 $130 $698 $497 $136 $661 -5.3%
Jun $324 $124 $476 $216 $93 $337 -29.2%
Jul $194 $74 $297 $151 $43 $223 -25.0%
Aug $194 $74 $297 $173 $93 $294 -1.0%
Sep $454 $149 $630 $173 $93 $294 -53.4%
Oct $540 $155 $723 $173 $93 $294 -59.4%
Nov $497 $149 $674 $529 $124 $681 1.1%
Dec $432 $130 $590 $529 $127 $684 15.9%
Total $ 5,357 $ 1,550 $ 7,243 $ 4,277 $ 1,311 $ 5,924 -18.2%
Average $ 446 $ 129 $ 576 $ 356 $ 109 $ 466 -19.1%
Cost ($/kWh) $0.139 72% 22% $0.141 1.3%
2010 2011
Electrical costs are based on the current electric rates.
2011
General Service
Month 2008 2009 2010 Average
Petersburg Middle & High School 43 Energy Audit (December 2011)
Alaska Energy Engineering LLC Annual Electric Consumption
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Petersburg Middle/High School
0
0
0
0
0
0
0
0
0
0
0
0
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Use (kWh)Month of the Year
Electric Use History - Middle/High School
2007
2008
2009
2010
0
50
100
150
200
250
300
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Demand (kW)Month of the Year
Electric Demand History
2007
2008
2009
2010
Petersburg Middle & High School 44 Energy Audit (December 2011)
Alaska Energy Engineering LLC Annual Electric Consumption
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Petersburg Vocational Education Building
0
0
0
0
0
0
0
0
0
0
0
0
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Use (kWh)Month of the Year
Electric Use History - Voc Ed Building
2008
2009
2010
2011
0
10
20
30
40
50
60
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Demand (kW)Month of the Year
Electric Demand History
2008
2009
2010
2011
Petersburg Middle & High School 45 Energy Audit (December 2011)
Alaska Energy Engineering LLC Electric Cost
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Petersburg Middle/High School 2010
$ 0
$ 1,000
$ 2,000
$ 3,000
$ 4,000
$ 5,000
$ 6,000
$ 7,000
$ 8,000
$ 9,000
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Cost (USD)Month of the Year
Electric Cost Breakdown
2010
Electric Use (kWh) Costs
Electric Demand (kW) Costs
0
50
100
150
200
250
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Electric Demand (kW)Electric Use (kWh)Month of the Year
Electric Use and Demand Comparison
2010
Electric Use
Electric Demand
Petersburg Middle & High School 46 Energy Audit (December 2011)
Alaska Energy Engineering LLC Electric Cost
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Petersburg Vocational Education Building 2011
$ 0
$ 100
$ 200
$ 300
$ 400
$ 500
$ 600
$ 700
$ 800
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Cost (USD)Month of the Year
Electric Cost Breakdown
2011
Electric Use (kWh) Costs
Electric Demand (kW) Costs
0
5
10
15
20
25
30
35
40
45
50
0
1,000
2,000
3,000
4,000
5,000
6,000
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Electric Demand (kW)Electric Use (kWh)Month of the Year
Electric Use and Demand Comparison
2011
Electric Use
Electric Demand
Petersburg Middle & High School 47 Energy Audit (December 2011)
Alaska Energy Engineering LLC Annual Fuel Oil Consumption
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Petersburg Middle/High School
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Year Fuel Oil Degree Days
2007 63,735 8,356
2008 61,777 8,239
2009 41,983 8,411
2010 56,715 8,202
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
2007 2008 2009 2010 Degree DaysGallons of Fuel OilYear
Annual Fuel Oil Use
Fuel Oil
Degree Days
Petersburg Middle & High School 48 Energy Audit (December 2011)
Alaska Energy Engineering LLC Billing Data
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Annual Energy Consumption and Cost
Energy Cost $/MMBtu Area ECI EUI
Fuel Oil $3.86 $39.81 63,865 $4.55 153
Electricity $0.117 $36.13
Source Cost
Electricity 634,600 kWh $74,300 2,200 22%
Fuel Oil 56,053 Gallons $216,400 7,600 78%
Totals $290,700 9,800 100%
Annual Energy Consumption and Cost
Consumption Energy, MMBtu
$0
$5
$10
$15
$20
$25
$30
$35
$40
$45
Fuel Oil ElectricityCost $ / MMBtuCost of Heat Comparison
Petersburg Middle & High School 49 Energy Audit (December 2011)
Alaska Energy Engineering LLC Annual Water Consumption
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Petersburg Middle/High School
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
450,000
500,000
550,000
600,000
2007 2008 2009 2010Gallons of WaterYear
Annual Water Use
Petersburg Middle & High School 50 Energy Audit (December 2011)
Alaska Energy Engineering LLC Annual Water Consumption
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Petersburg Vocational Education Building
Year Water
2008 39000
2009 30000
2010 10000
2011 12000
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
2008 2009 2010 2011Gallons of WaterYear
Annual Water Use
Petersburg Middle & High School 51 Energy Audit (December 2011)
Appendix C
Equipment Data
Petersburg Middle & High School 52 Energy Audit (December 2011)
MotorHP / Volts / RPM / EfficB 1 Boiler Room BoilerWeil McLain BL-16B6-5W 3350 MBHnon-modulatingB 2 Boiler Room BoilerCleaver BrooksCB-100-100 4184 MBHnon-modulating non-isolatedP 10 Boiler RoomHeating Loop Return PumpTACO 1935C1E1-363/4 HP/ 208 V/ 1725 RPM/ 75.5% UH 2 Boiler Room Unit Heaterno auto isolationEF 5 Boiler Room Exhaust FanPACE U-13FC1500 CFM 1/3 HP/ 115 V/ 1725 RPM/ 60% not operatingP 1 BSMT MechanicalHeating Supply Pump TACO F13009E2GAJIL0A450 GPM @ 50'10 HP/ 208 V/ 1760 RPM/ 91.7% VFD OFFP 2BSMT MechanicalHeating Supply Pump TACO F13009E2GAJIL0A450 GPM @ 50'10 HP/ 208 V/ 1760 RPM/ 91.7% VFD 41.2%P 7BSMT MechanicalDomestic Hot Water TACO 1915B1E1 4.91/3 HP/ 115 V/ 1725 RPM/ 60% DHW 1BSMT MechanicalDomestic Hot Water HeaterCanal Boiler Works3689250 Gallonindirect hot water heaterAC 1BSMT MechanicalControl Air Pressure Ingersol Rand T302 HP/ 208 V/ 1725 RPM/ 80%/ 78.5%EF 13BSMT MechanicalExhaust Fan1000 CFM 1/4 HP/ 115 V/ 1725 RPM/ 47%EF 6BSMT MechanicalExhaust FanPenn P-10V1/3 HP/ 115 V/ 1750 RPM/ 60%transfers heat from communicationsSF 1H.S. Penthouse Fan Library/Music VentilationPACE U 33 AF10150 CFM 7.5 HP/ 208 V/ 1750 RPM/ 91.7%RF 1H.S. Penthouse Fan Library/Music Return Air PACE A 24 AF9100 CFM 3.0 HP/ 208 V/ 1750 RPM/ 86.5%EF 1H.S. Penthouse Fan Restrooms/Janitors ExhaustPACE U 12 FC1350 CFM 1/2 HP/ 208 V/ 1750 RPM/ 62%VU 12nd Floor Fan RoomCommons Ventilation PACE A 22 AF7550 CFM 5 HP/ 208 V/ 1750 RPM/ 89.5% no VFD RF 42nd Floor Fan RoomCommons Return Fan PACE A 20 AF6200 CFM 2 HP/ 208 V/ 1750 RPM/86.5%SF 22nd Floor Fan RoomAdministration/ Classroom VentPACE A 18 AF4150 CFM 3 HP/ 208 V/ 1750 RPM/ 89.5%Petersburg Middle/High School - Major Equipment InventoryCapacityNotesUnit IDLocation Function Make Model
Petersburg Middle & High School 53 Energy Audit (December 2011)
MotorHP / Volts / RPM / EfficPetersburg Middle/High School - Major Equipment InventoryCapacityNotesUnit IDLocation Function Make ModelRF 22nd Floor Fan RoomAdministration/ Classroom ReturnPACE A15FC3500 CFM 1 1/2 HP/ 208 V/ 1750 RPM/ 78%EF 22nd Floor Fan RoomLounge/ Restrooms PACE U8FC515 CFM 1/4 HP/ 115 V/ 1725 RPM/ 47%SF 32nd Floor Fan RoomClassroomsPACE B18AF7500 CFM 7.5 HP/ 208 V/ 1750 RPM/ 91.0%RF 32nd Floor Fan RoomClassroomsPACE A20AF6300 CFM 3 HP/ 208 V/ 1750 RPM/ 86.5%VU 2M.S. Fan RoomClassrooms Vent PACE A22AF8400 CFM 5 HP/ 208 V/ 1750 RPM/ 89.5% RF 5M.S. Fan RoomClassroom Return Air PACE A20AF6172 CFM 1.5 HP/ 208 V/ 1750 RPM/ 84.0%RF 6M.S. Fan RoomClassroom Return Air PACE U12F1300 CFM 1/3 HP/ 208 V/ 1725 RPM/ 60%SF 4M.S. Fan RoomAuditorium Ventilation PACE A30SF13500 CFM 7.5 HP/ 208 V/ 1760 RPM/ 91/7%RF 8M.S. Fan RoomAuditorium Return PACE A271F12700 CFM 5 HP/ 208 V/ 1760 RPM/ 87.5%EF 8M.S. Fan RoomToilet RoomsPACE U11F1230 CFM 1/2 HP/ 115 V/ 1750 RPM/ 62%EF 10M.S. Fan RoomControl Room 263 PACE U6F100 CFM 1/6 HP/ 115 V EF 11M.S. Fan RoomConcessionsPACE U6F150 CFM 1/6 HP/ 115 VEF 9M.S. Fan RoomDark Rooms 251 a, b, c PACE U8F350 CFM 1/6 HP/ 115 VSF 5M.S. Fan Room 101Administration CommonsPACE A18AF5600 CFM 5 HP/ 208 V/ 1750 RPM/ 89.5%RF 7M.S. Fan Room 101Administration CommonsPACE A18AF5000 CFM 1.5 HP /208 V/ 1750 RPM/ 86.5%EF 12M.S. Fan Room 101Workroom 163 PACE U6F200 CFM 1/6 HP/ 115 VHRF 1Mat Room Fan Room1975 lockers/gym Innovent E-RHXC1695 CFM 1.5 HP/ 208 V/ 1750 RPM/ 86.5% Supply Fan1975 lockers/gym Innovent E-RHXC27800 CFM 2.0 HP/ 208 V/ 1750 RPM/ 86.5% Exhaust Fan
Petersburg Middle & High School 54 Energy Audit (December 2011)
MotorHP / Volts / RPM / EfficPetersburg Middle/High School - Major Equipment InventoryCapacityNotesUnit IDLocation Function Make ModelSF 5Mat Room Fan Room1975 classrooms Haakon AIRPAK8710 CFM 7.5 HP/ 208 V/ 1760 RPM/ 91% Supply Fan1975 classrooms Haakon AIRPAK7400 CFM 3 HP/ 208 V/ 1760 RPM/ 89% Return FanSF 3Mat Room Fan RoomMat RoomHaakon AIRPAK3250 CFM 2 HP/ 208 V/ 1760 RPM/ 86.5%HWM 2Mat Room Fan RoomDomestic Hot Water Amtrol WH120ZCDW 120 Gallonsindirect hot water heaterHWM 1Mat Room Fan RoomDomestic Hot Water Amtrol WH120ZCDW 120 Gallonsindirect hot water heaterS 2 SF Roof GymHaakon AIRPAK22000 CFM 10 HP/ 208 V/ 1760 RPM/ 91.7%S 2 RF Roof GymHaakon AIRPAK18000 CFM 5 HP/ 208 V/ 1760 RPM/ 89.5%SF 6 Mechanical 2 Mechanical 21000 CFM 1/4 HP/ 115 V/ 1725 RPM/ 47%E 3 Roof Storage Room 205 Cook 120 ACF645 CFM 1/2 HP/ 115 V/ 1725 RPM/62%EF 4 Roof Chem Room Fume Hood Penn FMX-14B780 CFM 1/3 HP/ 115 V/ 1725 RPM/ 60%EF 7Mechanical Room 202Greenhouse Room ExhaustPACE U-6FC260 CFM 1/10 HP/ 115 V/ 1725 RPMHWRP A Mechanical 2Domestic Hot Water Recirculation6 GPM 1/25 HP/ 115 VHWRP BMechanical 303Domestic Hot Water Recirculation4 GPM 1/25 HP/ 115 VAHU 1Vocational EducationVocational Education VentilationTrane Y8V278A2000 CFM 1.5 HP/ 208 V/ 1750 RPMlow/hi switch full outside airEF 1Vocational EducationExhaust FanCincinatti Fan HDBI-120 1680 CFM 3 HP/ 208 V/ 3450 RPM/ 85.5%EF 2Vocational EducationExhaust FanCincinatti Fan HDBI-150 3360 CFM 5 HP/ 208 V/ 3450 RPM/ 87.5%EF 3Vocational EducationExhaust FanCincinatti Fan HDBI-150 3360 CFM 5 HP/ 208 V/ 3450 RPM/ 87.5%EF 4Vocational EducationExhaust FanHDBI-120 1680 CFM 3 HP/ 208 V/ 3450 RPM/ 85.5%
Petersburg Middle & High School 55 Energy Audit (December 2011)
MotorHP / Volts / RPM / EfficPetersburg Middle/High School - Major Equipment InventoryCapacityNotesUnit IDLocation Function Make ModelDC 1Vocational EducationDust Collector Arrest All6200 CFM 15 HP/ 208 VE 2 RoofCook 245 HLC3090 CFM 1/2 HP/ 208 V/ 1725 RPMEF 3 Roof Storage Room 205 Penn740 CFM 1/3 HP/ 208 V
Petersburg Middle & High School 56 Energy Audit (December 2011)
Appendix D
Abbreviations
AHU Air handling unit
BTU British thermal unit
BTUH BTU per hour
CBJ City and Borough of Juneau
CMU Concrete masonry unit
CO2 Carbon dioxide
CUH Cabinet unit heater
DDC Direct digital controls
DHW Domestic hot water
EAD Exhaust air damper
EEM Energy efficiency measure
EF Exhaust fan
Gyp Bd Gypsum board
HVAC Heating, Ventilating, Air-
conditioning
HW Hot water
HWRP Hot water recirculating pump
KVA Kilovolt-amps
kW Kilowatt
kWh Kilowatt-hour
LED Light emitting diode
MBH 1,000 Btu per hour
MMBH 1,000,000 Btu per hour
OAD Outside air damper
PSI Per square inch
PSIG Per square inch gage
RAD Return air damper
RF Return fan
SIR Savings to investment ratio
SF Supply fan
UV Unit ventilator
VAV Variable air volume
VFD Variable frequency drive
Petersburg Middle & High School 57 Energy Audit (December 2011)