HomeMy WebLinkAboutSEA-AEE-JNU Juneau Douglas High School 2012-EE
Juneau Douglas High School
Juneau School District
Funded by:
Final Report
November 2011
Prepared by:
Energy Audit
Table of Contents
Section 1: Executive Summary 2
Section 2: Introduction 6
Section 3: Energy Efficiency Measures 8
Section 4: Description of Systems 1
Section 5: Methodology
Appendix A: Energy and Life Cycle Cost Analysis 2
Appendix B: Energy and Utility Data
Appendix C: Equipment Data 44
Appendix D: Abbreviations 51
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
Acknowledgment and Disclaimer
Acknowledgment: This material is based upon work supported by the Department of Energy under
Award Number DE-EE0000095.
Disclaimer: This report was prepared as an account of work sponsored by an agency of the United
States Government. Neither the United States Government nor any agency thereof, nor any of their
employees, makes any warranty, express or implied, or assumes any legal liability or responsibility
for the accuracy, completeness, or usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately owned rights. Reference herein to
any specific commercial product, process, or service by trade name, trademark, manufacturer, or
otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by
the United States Government or any agency thereof. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States Government or any agency
thereof.
Juneau Douglas High School 1 Energy Audit (November 2011)
Section 1
Executive Summary
An energy audit of the Juneau Douglas 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.
Juneau Douglas High School is a 190,738 square foot building that contains commons, classrooms,
offices, a music room, an auditorium, a main and auxiliary gym, a kitchen, a library, storage, and
mechanical support spaces.
Building Assessment
The following summarizes our assessment of the building.
Envelope
The building envelope appears to be well maintained and is in good condition. The building has a
Dryvit wall system which has experienced failure of the external coating over the insulation. This has
been addressed with the application of a metal panel wall system to protect the original Dryvit and
appears to be performing satisfactorily. Envelope issues include:
Wall Insulation: Over 45,000 square feet of the original concrete walls have an R-4 wall
assembly. Current optimum insulation values for walls in Juneau are R-26. Most of these walls
could be insulated from the outside.
Entrances: A significant amount of energy is lost through the main building entry by the
woodshop because the design did not incorporate an arctic entry. The existing design lends itself
well to this addition without compromising building aesthetics. Future designs should incorporate
arctic entries in all building entrance spaces.
Exterior Doors: Exterior doors are not thermally broken and many are uninsulated. Future
exterior door replacement selection should include these features. Weather stripping is in poor
condition and should be replaced.
Heating Systems
The school spaces are heated by two fuel oil boilers that supply heat to twenty-seven individual air
handling unit systems, fan coil units, and perimeter hydronic systems.
At the time of the audit one boiler was operating and the other was in standby mode. Heating water is
circulating through the standby boiler, which results in a significant amount of heat loss. This is
covered with recommendations in Section 3, Energy Efficiency Measure (EEM)-7.
The remainder of the fuel oil boiler heating system appears 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.
Juneau Douglas High School 2 Energy Audit (November 2011)
Ventilation Systems
The ventilation systems are designed to develop a positive pressure within the building envelope;
however, modifications to the mixed air temperature control on several systems have reduced outside
air flow to the point that it is no longer making up the continuous exhaust rates in the building. For
example, the library supply fan (B-SF-3) shuts down at 1:00 pm while the exhaust fan continues to
operate, and there is a lack of a make-up air when the woodshop dust collector system is started. As a
result, the exhaust make-up air infiltrates into the building. This approach has lower ventilation
efficiency than supplying the air via the ventilation systems. We recommend that system air exchange
rates for each space are reviewed and operational methods modified to better control the balance of
air within the building envelope (EEM-12 in Section 3).
Cooling Systems
The building has separate mechanical cooling systems for the computer server room, the kitchen
refrigerator and freezer units, the seawater aquarium system, and the building air handling systems.
The cooling system for the building air handling systems is no longer in use.
Control System
The building has a DDC control system for the HVAC systems.
Lighting
Interior lighting consists of T8 and T5 fluorescent fixtures, with some T-12 lighting remaining in the
mechanical spaces. Exterior lighting consists primarily of metal halide lighting.
Maintenance staff has de-lamped fixtures in several spaces to further reduce energy costs while
maintaining adequate light levels. Because the heat generated by the current lighting fixtures is less
expensive than heat produced by the boiler system at current fuel and electric rates, we recommend
that maintenance staff upgrade the remaining T-12 fixtures to more efficient T-8 units only as the
ballasts fail and need to be replaced.
Current light levels in the gym exceed the ASHRAE standards for lighting by almost 33%. An
evaluation of reducing the lighting electrical load in the main gym by almost 6,500 watts is discussed
in Section 3, EEM-16.
Summary
The building has an annual energy consumption of 66 kBtu/sqft, which is very near the 60 kBtu/sqft
average of all the buildings operated and maintained by the CBJ. Because almost 50% of the high
school’s walls are under-insulated, the building should have higher than average energy consumption.
This is not the case because building maintenance staff has reduced the air flows within the building
envelope below design levels. As a result, JDHS is outperforming more recently constructed Juneau
school buildings such as Riverbend Elementary by almost 50%. This is due to both a tighter building
envelope and a greatly reduced air exchange rate.
Conclusions that can be drawn from this data include the significant importance of understanding and
properly controlling ventilation rates in all spaces within the building envelope, and perhaps more
importantly, the fact that ventilation system designs are far more effective at saving (or wasting)
energy than the thermal envelope designs.
It is the assessment of the energy audit team that the majority of the building energy losses are due to
building envelope issues and the need to balance supply and exhaust flows to be able to control
building air infiltration. Recommendations for correcting these issues are contained within Section 3,
Energy Efficiency Measures.
Juneau Douglas High School 3 Energy Audit (November 2011)
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: Reduce Basement Storage Room Temperature
EEM-3: Add Interior Arctic Entry
EEM-4: Clear Access to Perimeter Heaters
EEM-5: Modify Kitchen HRU Control Programming
EEM-6: Optimize Lighting Controls
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-7: Isolate Standby Boiler $1,000 $4,100 ($217,300) ($212,200) 213.2
EEM-8: Electric Room Heat Recovery $500 $0 ($90,600) ($90,100) 181.2
EEM-9: Install Pipe Insulation $300 $0 ($10,000) ($9,700) 33.3
EEM-10: Insulate Boiler Expansion Tank $800 $0 ($13,700) ($12,900) 17.1
EEM-11: Replace Aerators / Showerheads $2,800 $0 ($45,100) ($42,300) 16.1
EEM-12: Optimize Ventilation Systems $172,400 $17,000 ($1,630,100) ($1,440,700) 9.4
EEM-13: Server Room Heat Recovery $23,100 $7,700 ($129,400) ($98,600) 5.3
Medium Priority
EEM-14: Replace Single Pane Door Glazing $1,500 $0 ($2,300) ($800) 1.5
EEM-15: Install A-CHF-1 Fan Controls $1,100 $0 ($1,600) ($500) 1.5
EEM-16: Upgrade Gym Lighting $48,200 ($6,000) ($49,300) ($7,100) 1.1
EEM-17: Upgrade Transformers $146,100 $0 ($155,800) ($9,700) 1.1
EEM-18: Increase Wall Insulation $1,811,700 $0 ($1,862,300) ($50,600) 1.0
Totals* $2,209,500 $22,800 ($4,207,500) ($1,975,200) 1.9
*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.
Juneau Douglas High School 4 Energy Audit (November 2011)
Summary
The energy audit revealed numerous opportunities for improving the energy performance of the
building. We recommend 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.
Juneau Douglas High School 5 Energy Audit (November 2011)
Section 2
Introduction
This report presents the findings of an energy audit of the Juneau Douglas High School located in
Juneau, 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
Juneau Douglas High School is a 190,738 square foot building that contains commons, classrooms,
offices, a music room, an auditorium, a main and auxiliary gym, a kitchen, a library, storage, and
mechanical support spaces.
The school is operated by 70 staff and 10 kitchen contractors, and attended by 726 students. The
facility is occupied in the following manner:
Classrooms 8:00 am – 4:00 pm (M-F)
Commons 7:00 am – 10:00 pm (M-Sat),
9:00 am – 2:00 pm (Sun)
Main Gym 9:00 am – 9:00 pm (M-Sat)
Auxiliary Gym 9:00 am – 7:00 pm (M-F)
Auditorium 4:00 pm – 7:00 pm (M-Sat)
Building History
1956 – Original Construction
1959 - Auditorium and Gymnasium
Addition
1960 - Classroom Addition
1966 - Auto Shop Constructed
1967 - Classroom Remodel
1984 - Addition and Remodel
1992 - Gymnasium Roof Replacement
1998 - Auditorium and Library Roof
Repair
2004 - Major Renovation with Atrium,
Kitchen and Counseling Addition
Juneau Douglas High School 6 Energy Audit (November 2011)
Energy Consumption
The building energy sources include an electric service and a fuel oil tank. Fuel oil is used for the
majority of the heating loads and domestic hot water while electricity serves all other loads. The
following table shows annual energy use and cost.
Annual Energy Consumption and Cost
Source Consumption Cost Energy, MMBtu
Electricity 1,353,200 kWh $142,500 4,600 37%
Fuel Oil 58,582 Gallons $222,600 8,000 63%
Totals $365,100 12,600 100%
Electricity
This chart shows electrical energy use
from 2007 to 2010. The effective cost—
energy costs plus demand charges—is
10.5¢ per kWh.
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
The following chart shows a comparison of the current
cost of fuel oil heat and electric resistance heat. The
comparison is based on a fuel oil conversion efficiency
of 70% and an electric boiler conversion efficiency of
95%. Electric heat is less expensive than fuel oil
heat.
Juneau Douglas High School 7 Energy Audit (November 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: Several 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: Reduce Basement Storage Room Temperature
Purpose: The temperature in the basement storage room is currently maintained at 68°F. Energy
will be saved if the temperature in this space is reduced to 60° .
Scope: Reduce temperature setting in basement storage room to 60°F.
Juneau Douglas High School 8 Energy Audit (November 2011)
EEM-3: Add Interior Arctic Entry
Purpose: A significant amount of energy is lost through the well-used building entry by the
woodshop because it is not an arctic entry. The layout is suitable for adding an arctic
entry without compromising building aesthetics. Energy will be saved if an interior arctic
entry is constructed to provide a secondary set of double doors.
Scope: Install an interior set of double doors to create an arctic entry for the building entrance by
the woodshop
EEM-4: Clear Access to Perimeter Heaters
Purpose: In many rooms furniture and shelving units are pushed up against the perimeter heaters.
For the perimeter heating units to operate as effectively and efficiently as possible, they
must have a clear path for air flow above and below them. Energy will be saved if all
staff members are educated in the importance of keeping access to the perimeter heaters
open and routine monitoring ensures clear air flow paths exist for all perimeter heaters.
Scope: Educate staff of the importance of not blocking air flow to the base or top of the
perimeter heating units and verify that access is clear on a routine basis.
EEM-5: Modify Kitchen HRU Control Programming
Purpose: When the kitchen heat recovery unit is off, the heating remains hot, heating the inside of
the cabinet. Energy will be saved if the controls for the 3-way valve are modified to close
the valve when the HRU is not operating.
Scope: Modify the control programing to close the heating coil automatic valve when the HRU is
not operating and the outside air temperature is above 32°F.
EEM-6: Optimize Lighting Controls
Purpose: The programmed lighting controls are faulty and result in unnecessary use of electricity.
The lighting control panels often turn lighting on or off at times other than when
programmed. This often results in areas of the school being lit outside of normal hours of
operation. This can also result in lighting being turned off while a space is occupied.
When either situation occurs, staff members must identify and reset the faulty lighting
control panel. This happens as often as several times weekly. Energy will be saved and
school maintenance operations simplified if the lighting control system is repaired.
Scope: Repair the faulty lighting control system
Juneau Douglas High School 9 Energy Audit (November 2011)
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-7: Isolate Standby Boiler
Purpose: During periods when the outside temperature is warm enough, only one boiler needs to
be operated. Circulating hot water through a standby boiler in a dual boiler system can
result in a 3% efficiency loss of the operable boiler due to the standby boiler acting as a
heat sink. Currently water circulates through both boilers approximately six months more
than is necessary. Energy will be saved if only a single boiler is on line when
temperatures permit.
Scope: Enable the lead boiler at the start of the school season. Turn on the standby boiler when
the weather gets colder and redundancy is needed to protect the building from freezing.
When weather gets milder in the spring, turn off the lead boiler and make the standby
boiler the new lead for the upcoming year.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$240 ($7,670) ($7,430) $1,000 $4,100 ($217,300) ($212,200) 213.2
EEM-8: Install Electrical Room Heat Recovery
Purpose: A significant amount of heat is generated by the transformers and electrical equipment
operating in room 117A. This heat is normally removed with an exhaust fan to the
outside. Energy will be saved if the heat is transferred to the adjacent hallway. This can
be achieved by turning off the exhaust fan and allowing the ventilation air that is supplied
to the room to push heated air out into the corridor through existing door louvers.
Scope: Turn off the exhaust fan and open the door louvers so air heated by the electrical
equipment flows out into the hallway.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($3,200) ($3,200) $500 $0 ($90,600) ($90,100) 181.2
Juneau Douglas High School 10 Energy Audit (November 2011)
EEM-9: Install Pipe Insulation
Purpose: Several sections of heating and domestic hot water piping are uninsulated. Energy will be
saved if these sections of piping are optimally insulated.
Scope: Install pipe insulation in the following locations:
- 7’ of 1” domestic hot water supply in boiler room
- 4’ of 1” domestic hot water return pipe in boiler room
- 3’ of 2 ½” tempered water return line
- 3’ of 1” hot water supply on P-5 in boiler room
- 10’ of ¾” supply to C-SF-2 along auditorium catwalk
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($350) ($350) $300 $0 ($10,000) ($9,700) 33.3
EEM-10: Insulate Boiler Expansion Tank
Purpose: The JDHS heating system expansion tank is exceptionally large and provides a
significant amount of surface area for heat loss. Energy will be saved if the tank is
insulated to reduce heat loss to the boiler room space.
Scope: Insulate the boiler expansion tank.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($480) ($480) $800 $0 ($13,700) ($12,900) 17.1
EEM-11: Replace Aerators and Showerheads
Purpose: Energy and water will be saved by replacing the lavatory aerators and showerheads with
low-flow models.
Scope: Replace lavatory aerators and showerheads with water-conserving fixtures.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($1,820) ($1,820) $2,800 $0 ($45,100) ($42,300) 16.1
Juneau Douglas High School 11 Energy Audit (November 2011)
EEM-12: Optimize Ventilation Systems
Purpose: The majority of the building uses constant volume ventilation systems to provide
conditioned air to interior spaces during the normal operational schedule, after school
hours for activities, and as needed on weekends. Energy will be saved if the systems are
optimized for actual building occupancy and operations.
Scope: Optimize and commission the ventilation systems as follows:
A-HV-1 (Welding Shop)
- The ventilation system operates in full outside air mode when any exhaust fan EF-1, 2,
3, or 4 is operating. Install a pressure sensor to modulate the outside air with the make-
up requirements of the exhaust fans.
A-HV-2 (Paint Booth)
- Turn off A-HE-4 when the fan is off.
ASF-1 (Auditorium)
- Heating water is circulating through the heating coil when the fan is off. Since this fan
is minimally operated, turning the heating coil off will reduce heat loss from the coil.
- The return fan was operating even though the supply fan was off. Interlocking the two
fans so both are off simultaneously will save fan energy.
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
A-SF-1 (2nd Floor Art Classrooms)
- The kiln room has several exhaust fans that are controlled by manual switches. Adding
thermostat control of the exhaust fans, with the setpoints staggered from 72°F to 78°F,
will insure they are not inadvertently left on. Install thermostats to control A-EF-4, A-
EF-5, and A-EF-6.
- Exhaust fan A-EF-12 is frequently left on. Install a timer so the fan shuts off.
A-SF-2 (Woodshop)
- Glycol heating pump AP-3 is not interlocked to turn off with A-SF-2. Interlock glycol
heating pump so it turns off with A-SF-2.
B-AHU-1 (Commons Area)
- Install a VFD on the supply fan to modulate air flow with cooling requirements.
- The CO2 sensor is out of calibration so the unit is supplying 55°F mixed air.
Reestablish CO2 sensor control to modulate ventilation air with occupancy.
Sequentially operate the mixing dampers and heating coil to maintain room setpoint
with CO2 sensor of dampers to maintain 800 ppm.
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
Juneau Douglas High School 12 Energy Audit (November 2011)
EEM-12, continued: Optimize Ventilation Systems
B-AHU-2 (2nd Floor Classrooms, Offices, and Atrium)
- Change the separate mixed air and supply air controls to sequential control of the
mixing dampers and heating coil to maintain the supply air setpoint with minimum
outside air override.
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
B-AHU-4 (Kitchen)
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
B-SF-1 and B-SF-2 (Food and Consumer Science)
- The unit is scheduled to operate on Saturdays. This should be changed.
- Change the separate mixed air and supply air controls to sequential control of the
mixing dampers and heating coil to maintain the supply air setpoint with minimum
outside air override.
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
B-SF-3 (Library)
- Install a VFD on the supply fan and return fan to modulate air flow with cooling
requirements.
- Add a CO2 sensor control to modulate ventilation air with occupancy. Sequentially
operate mixing dampers and the heating coil with a CO2 sensor to maintain an 800 ppm
room setpoint
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
B-SF-4
- Change the separate mixed air and supply air controls to sequential control of the
mixing dampers and heating coil to maintain the supply air setpoint with minimum
outside air override.
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
Juneau Douglas High School 13 Energy Audit (November 2011)
EEM-12, continued: Optimize Ventilation Systems
B-SF-5 (3rd Floor Atrium, Offices, Classrooms)
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
C-SF-1 (1st Floor Business Classes)
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
D-SF-2 (Music Rooms)
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
D-SF-4 (Auxiliary Gym Fan)
- Install a VFD on the supply fan and return fan to modulate air flow with cooling
requirements
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
E-SF-2 (Auditorium Addition)
- Return Fan E-RF-2 is currently not being used because it is noisy. Remove the fan to
reduce the static pressure on the system.
Heat Recovery Unit (Kitchen Hood)
- Turn the heating coil off when the fan is off.
GSF-1 (Gym)
- The mixed air setpoint of 55°F is overriding CO2 sensor control of the mixing dampers.
This is causing over-ventilation of the gym and higher energy consumption.
Reconfigure the controls to sequentially operate the mixing dampers and the heating
coil with the CO2 sensor to maintain an 800 ppm room setpoint.
- The exhaust air damper and outside air damper are interlocked to open together. This
can cause the return fan to push air out of the building that is needed for pressurization
and makeup. Changing the EAD control to operate from a pressure sensor will ensure
that air is relieved only when it is not needed within the building.
Mechanical Room C102 (Business Area)
- Repair supply duct insulation.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$1,000 ($59,200) ($58,200) $172,400 $17,000 ($1,630,100) ($1,440,700) 9.4
Juneau Douglas High School 14 Energy Audit (November 2011)
EEM-13: Install Server Room Heat Recovery
Purpose: Heat is generated by the equipment operating in the server room. Currently this heat is
discharge outside by a rooftop cooling unit. Energy will be saved if a fan is installed to
transfer the heat to the atrium.
Scope: Install a ducted fan unit to transfer the server room heat to the atrium.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$450 ($4,750) ($4,300) $23,100 $7,700 ($129,400) ($98,600) 5.3
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-14: Replace Single Pane Door Glazing
Purpose: Single pane Plexiglas is installed in two of the building entry doors. Energy will be saved
if the Plexiglas is replaced with double pane energy efficient glazing.
Scope: Replace single pane Plexiglas with energy efficient double pane glazing units.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($80) ($80) $1,500 $0 ($2,300) ($800) 1.5
EEM-15: Install A-CHF-1 Fan Controls
Purpose: Cabinet heating fan A-CHF-1 located under the main entrance adjacent stairwell. The
thermostat only controls the heating coil, so the fan is manually turned on in the fall and
turned off in the spring. Energy will be saved if the thermostat also controls the fan.
Scope: Modify the controls so the thermostat also turns the fan on and off.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($90) ($90) $1,100 $0 ($1,600) ($500) 1.5
EEM-16: Upgrade Main Gym Lighting
Purpose: The existing main gym lighting system consists of (54) 400-watt metal halide and (24)
175-watt/bulb high pressure sodium fixtures. The lighting load is 25.8 kW, much higher
than the ASHRAE standard of 19.2 kW. Energy will be saved if the main gym lighting is
replaced with a T-5 system.
Scope: Replace the main gym metal halide lamps with a properly sized T5 lighting system.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
($350) ($2,810) ($3,160) $48,200 ($6,000) ($49,300) ($7,100) 1.1
Juneau Douglas High School 15 Energy Audit (November 2011)
EEM-17: Upgrade Transformers
Purpose: Three transformers are not TP-1 rated. Energy will be saved if these less-efficient
transformers are replaced with energy efficient models that comply with NEMA Standard
TP 1-2001.
Scope: Replace the following less-efficient transformers with NEMA Standard TP 1-
2001compiant models:
- 1000 kVA (basement)
- 500 kVA (room 117A)
- 30 kVA (room 303 penthouse)
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($8,890) ($8,890) $146,100 $0 ($155,800) ($9,700) 1.1
EEM-18: Increase Wall Insulation
Purpose: Approximately 50% of the school walls have an estimated R-4 insulation value. An
optimal R-value by current construction standards is R-26. Energy will be saved if the
insulation level of the walls is increased. Installing 4” of rigid insulation over the exterior
concrete walls will increase the overall insulation value of the building envelope.
Scope: Install a minimum of 4” of exterior foam insulation with new siding around the perimeter
of the building.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($65,700) ($65,700) $1,811,700 $0 ($1,862,300) ($50,600) 1.0
Juneau Douglas High School 16 Energy Audit (November 2011)
LOW PRIORITY
Low priority EEMs do not offer a life cycle energy savings and are not recommended.
EEM-19: Upgrade Motors to Premium Efficiency
Purpose: The equipment inspection identified seven motors that could be upgraded with premium
efficiency models to save energy. They are:
- B-RF-2 3 HP from 76.9% efficiency to 89.5% efficiency
- B-SF-4 2 HP from 80.0% efficiency to 86.5% efficiency
- E-RF-2 3 HP from 76.9% efficiency to 89.5% efficiency
- E-RF-1 3 HP from 76.9% efficiency to 89.5% efficiency
- C-RF-1 1 ½ HP from 78.0% efficiency to 86.5% efficiency
- A-HV-2 7 ½ HP from 82.9% efficiency to 91.0% efficiency
- A-P-5 5 HP from 85.5% efficiency to 89.5% efficiency
Scope: Replace identified motors with premium efficiency motors.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($400) ($400) $8,100 $0 ($6,900) $1,200 0.9
EEM-20: Upgrade Exterior Lighting to LED
Purpose: The existing perimeter and parking lot lighting consists of metal halide (MH) and high
pressure sodium fixtures (HPS). These fixture styles are less efficient than LED lighting
and the lamp life is much shorter.
Scope: Replace the following existing exterior lights with LED lights:
- Recessed Cans, Front of Gym: (22) 70-watt HPS
- Soffit Lights, Metal Shop Area: (4) 50-watt HPS
- Parking Lot Lights by Dumpster: (3) @ 250-watt HPS
(5) @ 400-watt HPS
- Upper Parking Lot Lights (4) @ 175-watt MH
- Parking Garage (29) @ 70-watt HPS
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$150 ($1,430) ($1,280) $59,300 $2,500 ($25,000) $36,800 0.4
Juneau Douglas High School 17 Energy Audit (November 2011)
Section 4
Description of Systems
ENERGY SYSTEMS
This section provides a general description of the building systems. Energy conservation
opportunities are addressed in Section 3, Energy Efficiency Measures.
Building Envelope
R-value
Component Description (inside to outside) Existing Optimal
Exterior Walls 5/8” Gyp. bd, 25/32” fiber board, 8” concrete wall R-4 R-26
5/8” Gyp. bd, 2 ½” metal studs, 2 ½” batt, 8” concrete wall R-4 R-26
5/8” Gyp. bd, 25/32” fiber board, 8” concrete wall, 1 ½” foam
Insulation, metal siding R-14 R-26
5/8” Gyp. bd, 2 ½” metal studs, 2 ½” batt, 8” concrete wall,
1 ½” foam insulation, metal siding R-14 R-26
5/8” Gyp. bd, 3 ½ metal studs, 6” composite wall, 1 ½” foam
insulation, metal siding R-26 R-26
Parking Ceiling Metal studs w/ 6” batt insulation R-16 R-30
Roof EPDM tapered roof system with 6” average foam insulation R-30 R-46
Floor Slab 4” Concrete slab-on-grade R-10 R-10
Foundation 8” concrete w/ 2” perimeter insulation board R-10 R-20
Windows Aluminum frame double pane windows R-1.5 R-5
Doors Steel doors w/ non-thermally broken frames R-1.5 R-5
Juneau Douglas High School 18 Energy Audit (November 2011)
Heating System
The school spaces are heated by two fuel oil boilers that supply heat to twenty-seven individual air
handling unit systems, fan coil units, and perimeter hydronic systems. The heating system has the
following pumps:
A-P-6 is the woodshop glycol loop circulation pump
A-P-7 is the welding shop glycol coop circulation pump
B-P-1 & B-P-2 are the building circulation pumps
B-P-3 is a glycol loop circulation pump
B-P-5 is the domestic hot water circulation pump
Pump B-P-6 is the domestic hot water circulation pump
C-P-1 is the eye wash circulation pump
D-P-5 and D-P-6 are locker room glycol loop circulation pumps
Domestic Hot Water System
Domestic hot water heater is heated by an indirect hot water tank located in the boiler room
mezzanine. There is a 50-gallon electric water heater located in room 110 custodial to serve the Life
Skills spaces, and a 19-gallon electric hot water heater located in room 106 to serve the eye wash
stations.
Cooling Systems
The building has separate mechanical cooling systems for the computer server room, the kitchen
refrigerator and freezer units, the seawater aquarium system, and the building air handling systems.
The cooling system for the building air handling systems is no longer in use.
Automatic Control System
The building has a DDC system to control the operation of the heating and ventilation systems.
Energy can be saved through further optimization of fan system scheduling combined with a retro-
commissioning of the air handler systems.
Juneau Douglas High School 19 Energy Audit (November 2011)
Ventilation Systems
Area
Fan
System Description
1st Floor Business Classes C-RF-1 3,500 cfm 1 ½ hp constant volume fan supplying return air to
C-SF-1
1st Floor Business Classes C-SF-1 7,400 cfm 5 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, supply fan and return
fan
2nd Floor A-RF-1 9,100 cfm 7 ½ hp constant volume fan supplying return air to
A-SF-1
2nd Floor A-SF-1 14,900 cfm 10 hp constant volume air handling unit consisting
of a heating coil, mixing box, filter section, supply fan and
return fan
2nd Floor Classrooms,
Offices
B-AHU-2 10,230 cfm 10 hp constant volume air handling unit consisting
of a heating coil, mixing box, filter section, supply fan and
return fan
2nd Floor Classrooms,
Offices
B-RF-2 6,800 cfm 3 hp constant volume fan supplying return air to
AHU-2
3rd Floor 307/309 B-RF-6 1,760 cfm 3/4 hp constant volume fan supplying return air to B-
SF-6
3rd Floor 307/309 B-SF-6 2300 cfm 1 ½ hp constant volume air handling unit consisting
of a heating coil, mixing box, filter section, supply fan and
return fan
3rd Floor Classrooms,
Offices
B-SF-5 13,300 cfm 10 hp constant volume air handling unit consisting
of a heating coil, mixing box, filter section, supply fan and
return fan
3rd Floor Science Rooms B-AHU-3 8,460 cfm 5 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, and supply fan
3rd Floor Science Rooms B-EF-4 3,865 cfm 2 HP constant volume exhaust air fan
Admin B-RF-4 2,900 cfm 1 hp constant volume fan supplying return air to B-
SF-4
Admin B-RF-5 10,500 cfm 5 hp constant volume fan supplying return air to B-
SF-5
Admin B-SF-4 3,060 cfm 2 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, supply fan and return
fan
Art Rooms A-EF-12 1,200 cfm constant volume exhaust air fan
Auditorium ARF-1 5 hp constant volume fan supplying return air to ASF-1
Auditorium ASF-1 24,000 cfm 10 hp variable volume air handling unit consisting
of an outside air damper and supply fan
Auxiliary Gym D-RF-4 10 hp constant volume fan supplying return air to D-SF-4
Juneau Douglas High School 20 Energy Audit (November 2011)
Area
Fan
System Description
Auxiliary Gym D-SF-4 16,800 cfm 10 hp constant volume air handling unit consisting
of a heating coil, mixing box, filter section, supply fan and
return fan
Bathroom Exhaust D-EF-3 1/6 hp constant volume exhaust fan
Boiler Room D-SF-1 Not Used
Commons B-AHU-1 15,000 cfm 1 ½ hp constant volume air handling unit consisting
of a heating coil, mixing box, filter section, supply fan and
return fan
Commons B-RF-7 2100 cfm 3/4 hp constant volume fan supplying return air to B-
AHU-1
Commons B-RF-8 10,880 cfm 5 hp constant volume fan supplying return air to B-
AHU-1
Darkroom A-EF-8 6,600 cfm constant volume exhaust air fan
Elevator Room B-EF-1 600 cfm ½ hp constant volume exhaust air fan
Food and Consumer
Science Room
B-RF-1 13,300 cfm 5 hp constant volume fan supplying return air to B-
SF-1 and B-SF-2
Food and Consumer
Science Room
B-SF-1 10,635 cfm 7 ½ hp constant volume air handling unit consisting
of a heating coil, mixing box, filter section, supply fan and
return fan
Food and Consumer
Science Room
B-SF-2 6,065 cfm 5 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, supply fan and return
fan
Green Room Stage Sets E-RF-2 3 hp constant volume fan supplying return air to E-SF-2
Green Room Stage Sets E-SF-2 9,600 cfm 5 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, supply fan and return
fan
Gym GRF-1 10 hp constant volume fan supplying return air to GSF-1
Gym GSF-1 41,600 cfm 20 hp variable volume air handling unit consisting
of a heating coil, mixing box, filter section, supply fan and
return fan
Kiln Hood A-EF-4 4,500 cfm1 ½ hp constant volume exhaust air fan
Kiln Hood A-EF-5 2,400 cfm ¾ hp constant volume exhaust air fan
Kiln Hood A-EF-6 1 ½ hp constant volume exhaust air fan
Kitchen B-AHU-4 5,690 cfm 5 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, and supply fan
Kitchen B-RF-10 3/4 hp constant volume fan supplying return air to B-SF-6
Kitchen Heat Recovery HRU 3,120 cfm 5 hp kitchen air heat recovery unit
Juneau Douglas High School 21 Energy Audit (November 2011)
Area
Fan
System Description
Library B-RF-3 5,803 cfm 5 hp constant volume fan supplying return air to B-
SF-3
Library B-SF-3 9,315 cfm 5 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, supply fan and return
fan
Maintenance D-RF-2 Not Used
Maintenance D-SF-3 Not Used
Make Up Room E-EF-2 120 cfm 1/8 hp constant volume exhaust fan
Men’s Dressing room E-EF-1 120 cfm 1/8 hp constant volume exhaust fan
Men’s Locker Room D-EF-2 3 hp constant volume exhaust fan
Men’s Locker Room D-SF-5 6,900 cfm 5 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, supply fan and return
fan
Metal Shop A-HV-1 2 hp constant speed room ventilator
Metal Shop EF-1 1 ½ hp constant volume exhaust air fan
Metal Shop EF-2 4 hp constant volume exhaust air fan
Metal Shop EF-3 4 hp constant volume exhaust air fan
Metal Shop EF-4 4 hp constant volume exhaust air fan
Music Room D-SF-2 7,450 cfm 5 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, supply fan and return
fan
Music Rooms D-RF-1 1 1/2 hp constant volume fan supplying return air to D-SF-2
Paint Booth A-HV-2 7 ½ hp constant speed room ventilator
Popcorn Ventilator D-EF-9 1/3 hp constant volume exhaust fan
Projection Booth C-EF-8 Not Used
Projection Booth C-SF-2 Not Used
Restroom Exhaust A-EF-1 3,600 cfm 1 ½ hp constant volume exhaust air fan
Room 207 Bathroom E-EF-4 80 cfm 1.59 amp constant volume exhaust fan
Room 207 Bathroom E-EF-5 80 cfm 1.59 amp constant volume exhaust fan
Room 207 Custodial E-EF-6 80 cfm 1.59 amp constant volume exhaust fan (not working)
Room 207 Restroom E-EF-7 80 cfm 1.59 amp constant volume exhaust fan (not working)
Science Room Exhaust C-EF-3 2 HP constant volume exhaust air fan
Theatrical E-RF-1 Not Used
Juneau Douglas High School 22 Energy Audit (November 2011)
Area
Fan
System Description
Theatrical E-SF-1 8,280 cfm 5 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, supply fan and return
fan
Women’s Dressing E-EF-3 120 cfm 1/8 hp constant volume exhaust fan
Women’s Locker Room D-EF-1 3 hp constant volume exhaust fan
Women’s Locker Room D-SF-6 6,500 cfm 5 hp constant volume air handling unit consisting of
a heating coil, mixing box, filter section, supply fan and return
fan
Woodshop A-RF-2 Not Used
Woodshop A-RF-3 Not Used
Woodshop A-RF-4 1 ½ hp constant volume fan supplying air to A-SF-2
Woodshop A-SF-2 15,500 cfm 10 hp constant volume air handling unit consisting
of a heating coil, mixing box, filter section, supply fan and 2
return fans
Lighting
Although some T-12 lighting remains in the mechanical spaces, interior lighting primarily consists of
T5 and T8 fluorescent fixtures. Exterior lighting primarily consists of metal halide lighting. Because
lighting operational hours are controlled by staff, operational costs for lighting with existing
infrastructure are kept to a minimum. We recommend that maintenance staff upgrade the remaining
T-12 fixtures to more efficient T-8 units only as the ballasts fail and need to be replaced.
Electric Equipment
Commercial equipment for food preparation was located in the kitchen and surrounding spaces.
Juneau Douglas High School 23 Energy Audit (November 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.
Juneau Douglas High School 24 Energy Audit (November 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
2013.
Fuel Oil
Fuel oil currently costs $3.80 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.
Electricity
Electricity is supplied by Alaska Electric Light & Power Company (AEL&P). The building is billed
for electricity under AEL&P’s Rate 24. This rate charges for both electrical consumption (kWh) and
peak electric demand (kW). Electrical consumption is the amount of energy consumed and electric
demand is the rate of consumption. AEL&P determines the electric demand by averaging demand
over a continuously sliding fifteen minute window. The highest fifteen minute average during the
billing period determines the peak demand. The following table lists the electric charges, which
includes a 24% rate hike that was recently approved:
Juneau Douglas High School 25 Energy Audit (November 2011)
AEL&P Large Government Rate with Demand
Charge 1 On-peak (Nov-May) Off-peak (June-Oct)
Energy Charge per kWh 6.11¢ 5.92¢
Demand Charge per kW $14.30 $9.11
Service Charge per month $99.24 $99.24
Over recent history, electricity inflation has been less than 1% per year, which has lagged general
inflation. An exception is the recent 24% rate hike that was primarily due to construction of additional
hydroelectric generation at Lake Dorothy. This project affords the community a surplus of power
which should bring electric inflation back to the historic rate of 1% per year. Load growth from
electric heat conversions is likely to increase generating and distribution costs, especially if diesel
supplementation is needed. Combining these two factors contribute to an assumed electricity inflation
rate of 3%.
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 $0.102/kWh
General Inflation Rate 2% Electricity Inflation 3%
Fuel Oil $3.80 / gal Fuel Oil Inflation 6%
Juneau Douglas High School 26 Energy Audit (November 2011)
Appendix A
Energy and Life Cycle Cost Analysis
Juneau Douglas High School 27 Energy Audit (November 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
Juneau-Douglas High School
Basis
Economic
Study Period (years) 25 Nominal Discount Rate 5%General Inflation 2%
Energy
2011 $/gal Fuel Inflation 2012 $/gal
Fuel Oil $3.80 6% $4.03
Electricity $/kWh (2011)$/kW (2011)Inflation $/kWh (2012)$/kW (2012)
w/ Demand Charges $0.060 $12.14 2% $0.061 $12.38
w/o Demand Charges $0.105 -2% $0.107 -
EEM-7: Isolate Standby Boiler
Energy Analysis
Boiler Input MBH Loss %Loss MBH Hours, exist Hours, new kBtu η boiler Gallons
B-1 8,298 0.5% 41 5,760 3,600 -89,614 68%-952
B-2 8,298 0.5% 41 5,760 3,600 -89,614 68%-952
83 -179,229 -1,903
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Stage lead/standby boiler operation 0 1 ea $1,000 $1,000
Annual Costs
Stage lead/standby boiler operation 1 - 25 4 hrs $60.00 $4,086
Energy Costs
Fuel Oil 1 - 25 -1,903 gal $4.03 ($217,274)
Net Present Worth ($212,200)
EEM-8: Install Electric Room Heat Recovery
Energy Analysis
Number kVA η Loss, kW kBtu Factor η boiler Gallons
1 500 99.0% -5.0 -149,446 50% 68% -793
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Turn up themrostat on exhaust fan and open door louver 0 1 LS $500 $500
Energy Costs
Fuel Oil 1 - 25 -793 gal $4.03 ($90,584)
Net Present Worth ($90,100)
Juneau Douglas High School 28 Energy Audit (November 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
Juneau-Douglas High School
EEM-9: Install Pipe Insulation
Energy Analysis
Service Size Length Bare BTUH Insul BTUH Factor kBtu η boiler Gallons
Heating 0.75 10 74 11 100% -5,519 68%-59
Heating 1.00 4 90 12 100% -2,733 68%-29
DHW 1.00 10 31 5 100% -2,278 68%-24
DHW 2.50 3 74 9 100% -1,708 68%-18
-88
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Pipe Insulation 3/4" 0 10 lnft $5 $50
1" 0 14 lnft $6 $84
2.5" 0 3 lnft $13 $39
Estimating contingency 0 15%$26
Overhead & profit 0 30%$60
Design fees 0 10%$26
Project management 0 8%$23
Energy Costs
Fuel Oil 1 - 25 -88 gal $4.03 ($10,004)
Net Present Worth ($9,700)
EEM-10: Insulate Boiler Expansion Tank
Energy Analysis
Service Size Length Bare BTUH Insul BTUH Factor kBtu η boiler Gallons
Heating 48 9 1,030 76 15% -11,282 68%-120
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Insulate expansion tank 0 1 ea $750 $750
Energy Costs
Fuel Oil 1 - 25 -120 gal $4.03 ($13,677)
Net Present Worth ($12,900)
EEM-11: Replace Aerators and Showerheads
Energy Analysis
η boiler 68%
Fixture Existing Proposed Uses/day Days Water,Gals % HW kBTU Gallons
Showerhead 20.0 10.0 5 180 -9,000 80% -4,804 -51
Lavatories 0.3 0.2 1,256 198 -44,764 80% -23,893 -254
-53,764 -305
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace lavatory aerators 0 56 ea $35 $1,960
Replace showerhead 0 25 ea $35 $875
Energy Costs
Water 1 - 25 -54 kgals $10.960 ($10,328)
Fuel Oil 1 - 25 -305 gal $4.03 ($34,789)
Net Present Worth ($42,300)
Gallons per Use
Juneau Douglas High School 29 Energy Audit (November 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
Juneau-Douglas High School
EEM-12: Optimize Ventilation Systems
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
ARF-1 Existing -12,000 0.50 60%-2 89%-1 400 -528
D-SF-4 Existing -16,800 2.00 60%-9 91%-7 1,530 -11,051
Optimized 10,000 1.25 55%4 91%3 1,530 4,485
E-RF-2 Existing -6,900 0.50 55%-1 91%-1 1,440 -1,165
B-SF-3 Existing -9,315 1.25 55%-3 89%-3 1,620 -4,523
Optimized 6,000 1.00 55%2 89%1 1,620 2,331
B-RF-3 Existing -8,805 0.88 50%-2 86%-2 1,620 -3,427
Optimized 5,500 0.60 50%1 86%1 1,620 1,468
B-AHU-1 Existing -15,000 1.75 55%-8 91%-6 3,420 -21,053
Optimized 10,000 1.25 55%4 91%3 3,420 10,025
B-RF-8 Existing -10,880 0.75 50%-3 91%-2 3,420 -7,199
Optimized 9,000 0.60 50%2 91%1 3,420 4,764
Existing -10,230 0.75 50%-2 91%-2 0
Optimized 9,000 0.60 50%2 91%1 0
S-7 Existing -3,600 1.00 50%-1 88%-1 0
Optimized 1,800 0.75 50%0 88%0 0
-14 -25,872
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
ASF-1 Existing -23,500 65 68 -76 400 -30,456 68%-323
Optimized 23,500 67 68 25 400 10,152 68%108
GSF-1 Existing -25,000 60 68 -216 2,880 -622,080 68%-6,605
Optimized 25,000 66 70 108 2,880 311,040 68%3,303
A-SF-1 Existing -4,500 60 70 -49 80 -3,888 68%-41
Optimized 4,500 65 70 24 80 1,944 68%21
E-EF-12 Existing -1,200 60 70 -13 576 -7,465 68%-79
B-SF-3 Existing -9,315 61 70 -91 1,440 -130,380 68%-1,384
Optimized 6,000 65 70 32 1,440 46,656 68%495
B-AHU-1 Existing -15,000 55 70 -243 3,420 -831,060 68%-8,824
Optimized 10,000 65 70 54 3,420 184,680 68%1,961
A-HV-1 Existing -3,400 40 70 -110 1,620 -178,459 68%-1,895
Optimized 3,400 60 70 37 1,620 59,486 68%632
B-AHU-2 Existing -10,230 60 70 -110 600 -66,290 68%-704
Optimized 10,230 64 70 66 600 39,774 68%422
B-SF-1 Existing -10,635 60 70 -115 600 -68,915 68%-732
Optimized 10,635 64 70 69 600 41,349 68%439
B-SF-2 Existing -6,065 60 70 -66 600 -39,301 68%-417
Optimized 6,065 64 70 39 600 23,581 68%250
B-SF-4 Existing -3,060 60 70 -33 600 -19,829 68%-211
Optimized 3,060 64 70 20 600 11,897 68%126
Existing -3,600 60 70 -39 0 68%0
Optimized 1,800 65 70 10 0 68%0
-1,267,564 -13,459
Juneau Douglas High School 30 Energy Audit (November 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
Juneau-Douglas High School
EEM-12, continued: Optimize Ventilation Systems
ASF-1
MBH Hours kBtu η boiler Gallons
-2 6,480 -12,960 68% -138
Pumps
Pump GPH Head η pump BHP η motor kW Hours kWh
AP-3 -38 45 55% -1.1 85% -0.9 4,050 -3,739
AP-5 -140 60 55% -5.2 91% -4.2 4,050 -17,154
-20,893
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Remove E-RF-2 0 1 ea $1,000 $1,000
Repair supply duct insulation 0 1 ea $500 $500
Controls 0 $0
Control EAD from pressure sensor 0 13 ea $3,000 $39,000
Change control sequence 0 16 ea $300 $4,800
Install manual thermostats 0 4 ea $150 $600
Install timer 0 1 ea $150 $150
Install CO2 sensor override of mixing dampers 0 2 ea $3,000 $6,000
Install VFD 0 6 ea $7,500 $45,000
Estimating contingency 0 15% $14,558
Overhead & profit 0 30% $33,482
Design fees 0 10% $14,509
Project management 0 8% $12,768
Annual Costs
DDC Maintenance 1 - 25 1 LS $1,000.00 $17,027
Energy Costs
Electric Energy 1 - 25 -46,765 kWh $0.061 ($50,164)
Electric Demand 1 - 25 -127 kW $12.38 ($27,552)
Fuel Oil 1 - 25 -13,597 gal $4.03 ($1,552,344)
Net Present Worth ($1,440,700)
Juneau Douglas High School 31 Energy Audit (November 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
Juneau-Douglas High School
EEM-13: Server Room Heat Recovery
Energy Analysis
Fuel Oil
MBH CFM Tave Trm Hours MBH kBtu η boiler Gallons
15 1,400 70 80 6,480 -15 -99,792 68%-1,060
Electricity
Cooling Unit
kBtu SEER kWh
-99,792 11.0 -9,072
Fan
Unit BHP kW Hours kWh
Fan 0.25 0.19 6,480 1,209
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Fan 0 1 LS $3,500 $3,500
Ductwork and grilles 0 1 LS $8,000 $8,000
Electrical 0 1 ea $1,500 $1,500
Estimating contingency 0 15%$1,950
Overhead & profit 0 30% $4,485.00
Design fees 0 10%$1,944
Project management 0 8%$1,710
Annual Costs
Pump maintenance 1 - 25 1 LS $200.00 $3,405
Fan coil maintenance 1 - 25 1 LS $250.00 $4,257
Energy Costs
Electric Energy 1 - 25 -7,863 kWh $0.061 ($8,435)
Fuel Oil 1 - 25 -1,060 gal $4.03 ($120,975)
Net Present Worth ($98,700)
EEM-14: Replace Single Pane Door Glazing
Energy Analysis
Component Area R,exist R,new ΔT MBH kBtu η boiler Gallons
Door Glazing 11 1.00 3.0 30 -0.2 -1,927 68%-20
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace door glazing unit 0 11 sqft $75 $825
Estimating contingency 0 15%$124
Overhead & profit 0 30%$285
Design fees 0 10%$123
Project management 0 8%$109
Energy Costs
Fuel Oil 1 - 25 -20 gal $4.03 ($2,336)
Net Present Worth ($900)
Juneau Douglas High School 32 Energy Audit (November 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
Juneau-Douglas High School
EEM-15: Install A-CHF-1 Fan Controls
Energy Analysis
Fan Savings
HP kW Hours, exist Hours, new kWh
0.3 0.2 5,040 1,663 -831
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Rewire contols to include thermostat control of fan 0 1 LS $600 $600
Estimating contingency 0 15%$90
Overhead & profit 0 30%$207
Design fees 0 10%$90
Project management 0 8%$79
Energy Costs
Electric Energy (Effective Cost)1 - 25 -831 kWh $0.107 ($1,561)
Net Present Worth ($500)
EEM-16: Upgrade Gym Lighting
Energy Analysis
Lamp Lamp, watts Fixture Watts Lamp Lamp, watts Fixture Watts kW Hours kWh
MH 400 460 T5 310 357 -5.6 2,592 -14,487
MH 175 201 -4.8 2,592 -12,519
-10.4 -27,006
Lamp Replacement
# Fixtures Lamp # Lamps Life, hrs Replace/yr $/lamp replace
78 MH -1 20,000 -10.11 $30
54 T5 6 30,000 4.67 $24
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace 400 watt MH with T5 Fluorescent 0 54 LS $525 $28,350
Estimating contingency 0 10%$2,835
Overhead & profit 0 30%$9,356
Design fees 0 10%$4,054
Project management 0 8%$3,568
Annual Costs
Existing lamp replacement, 400 watt MH 1 - 25 -10.11 replacements $60.00 ($10,327)
New lamp replacement, T5 1 - 25 4.67 replacements $54.00 $4,290
Energy Costs
Electric Energy 1 - 25 -27,006 kWh $0.061 ($28,969)
Electric Demand 1 - 25 -94 kW $12.38 ($20,352)
Net Present Worth ($7,200)
24
Existing Replacement Savings
Fixtures
54
Juneau Douglas High School 33 Energy Audit (November 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
Juneau-Douglas High School
EEM-17: Upgrade Transformers
Energy Analysis
Number kVA ηold ηnew KW kWh
1 30 96.8% 98.4% -0.5 -4,205
1 500 98.2% 99.1% -4.5 -39,420
1 1,000 98.4% 99.2% -8.0 -70,080
-13.0 -113,705
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace transformer, kVA 30 0 1 LS $4,900 $4,900
Replace transformer, kVA 500 0 1 LS $35,100 $35,100
Replace transformer, kVA 750 0 1 LS $54,600 $54,600
Overhead & profit 0 30% $28,380
Design fees 0 10% $12,298
Project management 0 8% $10,822
Energy Costs
Electric Energy 1 - 25 -113,705 kWh $0.061 ($121,972)
Electric Demand 1 - 25 -156 kW $12.38 ($33,807)
Net Present Worth ($9,700)
EEM-18: Increase Wall Insulation
Energy Analysis
Component Area R,exist R,new ΔT MBH kBtu η boiler Gallons
Wall 45,517 4 24 25 -237.1 -1,536,199 68% -16,311
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install wall insulation 0 45,517 sqft $27 $1,228,959
Overhead & profit 0 30% $368,688
Design fees 0 5% $79,882
Project management 0 8% $134,202
Energy Costs
Fuel Oil 1 - 25 -16,311 gal $4.03 ($1,862,291)
Net Present Worth ($50,600)
Juneau Douglas High School 34 Energy Audit (November 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
Juneau-Douglas High School
EEM-19: Upgrade Motors
Energy Analysis
Equip Number HP ηold ηnew kW Hours kWh
C-RF-1 1 1.5 78.0% 86.5% -0.10 1,620 -154
B-SF-4 1 2 80.8% 86.5% -0.09 1,620 -138
B-RF-2 1 3 76.9% 89.5% -0.28 1,620 -457
E-RF-2 1 3 76.9% 89.5% -0.28 1,620 -457
E-RF-1 1 3 76.9% 89.5% -0.28 1,620 -457
A-P-5 1 5 85.5% 89.5% -0.15 6,480 -967
A-HV-2 1 7.5 82.9% 91.7% -0.49 1,620 -798
-1.7 -3,427
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 2 0 1 LS 970 $970
Replace motor 3 0 3 LS 1,080 $3,240
Replace motor 5 0 1 LS 1,290 $1,290
Replace motor 7.5 0 1 LS 1,690 $1,690
Energy Costs
Electric Energy 1 - 25 -3,427 kWh $0.061 ($3,676)
Electric Demand 1 - 25 -15 kW $12.38 ($3,258)
Net Present Worth $1,200
Juneau Douglas High School 35 Energy Audit (November 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
Juneau-Douglas High School
EEM-20: Upgrade Exterior Lighting to LED
Energy Analysis
Type # Fixtures Lamp Lamp, watts Fixture Watts Lamp Lamp, watts Fixture Watts Savings, kWh
Area 4 MH 175 219 LED -93 -2,197
WallPak 4 HPS 50 63 LED -30 -569
Downlight 22 HPS 70 88 LED -40 -4,577
Surface 29 HPS 70 88 LED -40 -6,033
Cobra Head 3 HPS 250 313 LED -106 -2,713
Cobra Head 5 HPS 400 500 LED -170 -7,236
-23,326
Lamp Replacement
Type # Fixtures Lamp # Lamps Life, hrs Lamps//yr $ / lamp $ / Replace
Area 4 MH -1 15,000 -1.17 $40 $20
WallPak 4 HPS -1 24,000 -0.73 $40 $20
Downlight 22 HPS -1 24,000 -4.02 $42 $20
Surface 29 HPS -1 24,000 -5.29 $32 $20
Cobra Head 3 HPS -1 24,000 -0.55 $45 $60
Cobra Head 5 HPS -1 24,000 -0.91 $50 $60
Area 4 LED 1 60,000 0.29 $190 $20
WallPak 4 LED 1 60,000 0.29 $125 $20
Downlight 22 LED 1 60,000 1.61 $125 $20
Surface 29 LED 1 60,000 2.12 $190 $20
Cobra Head 3 LED 1 60,000 0.22 $200 $60
Cobra Head 5 LED 1 60,000 0.37 $225 $60
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace Area Light: 150 watt MH with LED 0 4 LS $900 $3,600
Replace WallPak: 50 watt HPS with LED 0 4 LS $525 $2,100
Replace Downlight: 70 watt HPS with LED 0 22 LS $525 $11,550
Replace Surface Mount: 70 watt HPS with LED 0 29 LS $525 $15,225
Replace Cobra Head: 250 watt HPS with LED 0 3 LS $525 $1,575
Replace Cobra Head: 400 watt HPS with LED 1 5 LS $900 $4,371
Overhead & profit 0 30% $11,526
Design fees 0 10%$4,995
Project management 0 8%$4,395
Annual Costs
Existing lamp replacement, 175 watt MH 1 - 25 -1.17 lamps $60.00 ($1,193)
Existing lamp replacement, 50 watt HPS 1 - 25 -0.73 lamps $60.00 ($746)
Existing lamp replacement, 70 watt HPS 1 - 25 -4.02 lamps $62.00 ($4,239)
Existing lamp replacement, 70 watt HPS 1 - 25 -5.29 lamps $52.00 ($4,686)
Existing lamp replacement, 250 watt HPS 1 - 25 -0.55 lamps $105.00 ($979)
Existing lamp replacement, 400 watt HPS 1 - 25 -0.91 lamps $110.00 ($1,709)
LED board replacement, 93 watts 1 - 25 0.29 LED board $210.00 $1,044
LED board replacement, 30 watts 1 - 25 0.29 LED board $145.00 $721
LED board replacement, 40 watts 1 - 25 1.61 LED board $145.00 $3,965
LED board replacement, 40 watts 1 - 25 2.12 LED board $210.00 $7,570
LED board replacement, 106 watts 1 - 25 0.22 LED board $260.00 $970
LED board replacement, 170 watts 1 - 25 0.37 LED board $285.00 $1,771
Energy Costs
Electric Energy 1 - 25 -23,326 kWh $0.061 ($25,022)
Net Present Worth $36,800
Existing Replacement
Juneau Douglas High School 36 Energy Audit (November 2011)
Appendix B
Energy and Utility Data
Juneau Douglas High School 37 Energy Audit (November 2011)
Alaska Energy Engineering LLC Billing Data
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Juneau-Douglas High School
ELECTRIC RATE
Electricity ($ / kWh )0.0611 0.0592
Demand ( $ / kW )14.30 9.11
Customer Charge ( $ / mo )99.24 99.24
Sales Tax ( % )0.0% 0.0%
ELECTRICAL CONSUMPTION AND DEMAND
kWh kW kWh kW kWh kW kWh kW
Jan 143,800 480.0 139,800 500.0 122,600 466.0 118,000 430.0 131,050
Feb 172,800 458.0 150,000 468.0 125,200 418.0 124,000 402.0 143,000
Mar 159,600 462.0 144,600 454.0 130,600 406.0 127,600 398.0 140,600
Apr 147,200 486.0 138,600 462.0 120,600 402.0 122,600 402.0 132,250
May 158,800 492.0 131,000 456.0 112,600 406.0 119,800 404.0 130,550
Jun 135,000 460.0 87,000 356.0 107,600 408.0 110,200 386.0 109,950
Jul 69,200 180.0 50,600 136.0 54,000 302.0 47,000 182.0 55,200
Aug 55,600 128.0 53,200 174.0 53,000 160.0 50,000 164.0 52,950
Sep 96,600 446.0 78,000 374.0 68,400 364.0 76,400 372.0 79,850
Oct 126,000 452.0 131,000 416.0 121,400 406.0 118,200 402.0 124,150
Nov 143,000 460.0 129,800 426.0 119,000 388.0 120,800 398.0 128,150
Dec 141,800 472.0 115,800 418.0 125,400 408.0 119,000 400.0 125,500
Total 1,549,400 1,349,400 1,260,400 1,253,600 1,353,200
Average 129,117 415 112,450 387 105,033 378 104,467 362 112,767
Load Factor 42.7%39.8%38.1%39.6%385
ELECTRIC BILLING DETAILS
Month Energy Demand Cust & Tax Total Energy Demand Cust & Tax Total % Change
Jan 7,491 6,664 99 14,254 7,210 6,149 99 13,458 -5.6%
Feb 7,650 5,977 99 13,726 7,576 5,749 99 13,424 -2.2%
Mar 7,980 5,806 99 13,885 7,796 5,691 99 13,587 -2.1%
Apr 7,369 5,749 99 13,217 7,491 5,749 99 13,339 0.9%
May 6,880 5,806 99 12,785 7,320 5,777 99 13,196 3.2%
Jun 6,574 3,717 99 10,390 6,733 3,516 99 10,349 -0.4%
Jul 3,299 2,751 99 6,150 2,872 1,658 99 4,629 -24.7%
Aug 3,238 1,458 99 4,795 3,055 1,494 99 4,648 -3.1%
Sep 4,179 3,316 99 7,595 4,668 3,389 99 8,156 7.4%
Oct 7,418 3,699 99 11,215 7,222 3,662 99 10,983 -2.1%
Nov 7,271 5,548 99 12,919 7,381 5,691 99 13,172 2.0%
Dec 7,662 5,834 99 13,596 7,271 5,720 99 13,090 -3.7%
Total $ 77,010 $ 56,325 $ 1,191 $ 134,526 $ 76,595 $ 54,246 $ 1,191 $ 132,032 -1.9%
Average $ 6,418 $ 4,694 $ 99 $ 11,210 $ 6,383 $ 4,520 $ 99 $ 11,003 -1.9%
Cost ($/kWh)$0.107 58% 41% 1% $0.105 -1.3%
Electrical costs are based on the current electric rates.
2009 2010
2010
AEL&P Electric Rate 24 On-Peak
Nov-May
Off-peak
Jun-Oct
Month 2007 2008 2009 Average
Juneau Douglas High School 38 Energy Audit (November 2011)
Alaska Energy Engineering LLC Annual Electric Consumption
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Juneau-Douglas High School
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
180,000
200,000
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecElectric Use (kWh)Month of the Year
Electric Use History
2007
2008
2009
2010
0.0
100.0
200.0
300.0
400.0
500.0
600.0
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
Juneau Douglas High School 39 Energy Audit (November 2011)
Alaska Energy Engineering LLC Electric Cost
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Juneau-Douglas High School 2010
$ 0
$ 2,000
$ 4,000
$ 6,000
$ 8,000
$ 10,000
$ 12,000
$ 14,000
$ 16,000
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
Customer Charge and Taxes
0.0
50.0
100.0
150.0
200.0
250.0
300.0
350.0
400.0
450.0
500.0
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
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
Juneau Douglas High School 40 Energy Audit (November 2011)
Alaska Energy Engineering LLC Annual Fuel Oil Consumption
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Juneau-Douglas High School
Year Fuel Oil Degree Days
2007 61,008 9,282
2008 54,759 9,093
2009 59,979 9,284
2010 41,700 9,013
5,000
6,000
7,000
8,000
9,000
10,000
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
2007 2008 2009 2010 Degree DaysGallons of Fuel OilYear
Annual Fuel Oil Use
Fuel Oil
Degree Days
Juneau Douglas High School 41 Energy Audit (November 2011)
Alaska Energy Engineering LLC Annual Water Consumption
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Juneau-Douglas High School
Year Water
2007 1,248,000
2008 1,032,000
2009 1,176,000
2010 1,020,000
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
800,000
900,000
1,000,000
1,100,000
1,200,000
1,300,000
2007 2008 2009 2010Gallons of WaterYear
Annual Water Use
Juneau Douglas High School 42 Energy Audit (November 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 $3.80 $39.20 190,738 $1.91 66
Electricity $0.105 $32.49
Source Cost
Electricity 1,353,200 kWh $142,500 4,600 37%
Fuel Oil 58,582 Gallons $222,600 8,000 63%
Totals $365,100 12,600 100%
Annual Energy Consumption and Cost
Consumption Energy, MMBtu
$0.00
$5.00
$10.00
$15.00
$20.00
$25.00
$30.00
$35.00
$40.00
$45.00
Fuel Oil ElectricityCost $ / MMBtuCost of Heat Comparison
Juneau Douglas High School 43 Energy Audit (November 2011)
Appendix C
Equipment Data
Juneau Douglas High School 44 Energy Audit (November 2011)
MotorHP / Volts / RPM / EfficB RF 2 319 AReturn Air to AHU 2 Pace B-18SFTD 6800 CFM 3 HP/ 480 V/ 1745 RPM/ 76.9%B SF 3 319 ALibraryPace B-18AFSTD 9315 CFM 5 HP/ 480 V/ 1750 RPM/ 89.5%B RF 3 319 AReturn Air to B SF 3 Pace A-22FCSTD 5803 CFM 5 HP/ 480 V/ 1750 RPM/ 89.5%B SF 4 319 AAdministration Area Pace A-14FCSTD 3060 CFM 2 HP/ 480 V/ 1750 RPM/ 80%B RF 4 319 AReturn Air to B SF 4 Pace A-14FCSTD 2900 CFM 1 HP/ 480 V/ 1725 RPM/76.7%B EF 4 3033rd Floor Science RoomsPace U-22FSTD 3865 CFM @ 3/4" 2 HP/ 480 V/ 1740 RPM/ 85.5%B P 3 303Glycol Circulation PumpB&G 2332731 HP/ 480 V/ 1740 RPM/76.7%B SF 6 303Classrooms Pace A-11FCSTD 2300 CFM @ 1" 1.5 HP/ 480 V/ 1745 RPM/79.1%B RF 6 303Return Fan for B SF 6 Pace U-13FSTD 1760 CFM 3/4 HP/ 430 V/ 1725 RPM/82%B AHU 3 303Science Rooms Pace A-22AFSI 8460 CFM 5 HP/ 480 V/ 1750 RPM/ 89.5%B AHU 1 303CommonsPace A-30AFSI 1500 CFM 15 HP/ 480 V/ 1775 RPM/ 93%B RF 8 303Return Air for B AHU 1Pace U-33BSTD 10880 CFM 5 HP/ 480 V/ 1750 RPM/ 89.5%B RF 7 303Return Air for B AHU 1Pace U-15FSTD 2100 CFM 3/4 HP/ 480 V/ 1750 RPM/82%B AHU 4 303 Penthouse Kitchen Air Logic CSU-6K-H-8 5690 CFM 5 HP/ 480 V/ 1750 RPM/ 89.5% XFMR 303 Penthouse Transformer Square D 30T 3H 30 KVA 150° C Temp Rise Non-TPI HRU 303 PenthouseKitchen Heat RecoveryAir Logic CSU-17K 3120 CFM 5 HP/ 480 V/ 1760 RPM/ 89.5%B RF 10 303 Penthouse Return Fan Loren Cook 210 CPS 3/4 HP/ 430 V/ 1760 RPM/82%RoofKitchen Refrigeration SystemCold Zone CZ4S2A2 HP 1/3 1.3 HP / 208 V/84%C EF 3 RoofScience Room Exhaust2 HP/ 480 V/ 1750 RPM/ 84%D EF G Popcorn Fan Cook 120R4B 1/3 HP/ 480 V/ 1725 RPMRoof A/C McQuayAGZ055AS27-8R10not usedno access or labelsJuneau Douglas High School - Major Equipment InventoryCapacityNotesUnit ID Location Function Make Model
Juneau Douglas High School 45 Energy Audit (November 2011)
MotorHP / Volts / RPM / EfficJuneau Douglas High School - Major Equipment InventoryCapacityNotesUnit ID Location Function Make ModelE EF 1 Green Rooms Men's Dressing Room PVC Z-12 120 CFM1/8 HP/ 115 VE EF 2 Green Rooms Make Up Room PVC Z-12 120 CFM1/8 HP/ 115 VE EF 3 Green RoomsWomen's Dressing RoomPVC Z-12 120 CFM1/8 HP/ 115 VE EF 4 207207 Bathroom PVC Z-880 CFM115 V/ 1.59 AmpE EF 5 207207 Bathroom PVC Z-880 CFM115 V/ 1.59 AmpA EF 1 322Rest Room Exhaust Pace U-20FSTD 3600 CFM 1.5 HP/ 1725 RPM/ 208 V/ 86.5%E EF 6 207207 Custodial PVC Z-880 CFM115 V/ 1.59 AmpNot WorkingE EF 7 207207 I Bathroom PVC Z-880 CFM115 V/ 1.59 AmpNot WorkingD SF 1 RoofBoiler Room VentD EF 2 RoofLocker Room Vent Dayton 4YY223 HP/ 480 V/ 1750 RPM/ 88.5%D EF 1 RoofLocker Room Vent Dayton 4YY223 HP/ 480 V/ 1750 RPM/ 88.5%C EF 8 Auditorium Auditorium1/2 HP/ 208 V/ 1725 RPM/62%C SF 2 Auditorium Projection BoothnoneB 1 Boiler Room BoilerWeil McLain 2594 6970 MBH 50 gallons/ HR nozzleB 2 Boiler Room BoilerWeil McLain 2594 6970 MBH 60 gallons/ HR nozzleHSB P 1 Boiler RoomBoiler Loop CirculationB&G 6E-11-BF 1299 gpm @ 40' 20 HP/ 480 V/ 1180 RPM/ 92.4%HSB P 2 Boiler RoomBoiler Loop CirculationB&G 6E-11-BF 1300 gpm @ 40' 20 HP/ 480 V/ 1180 RPM/ 92.4%HWH 1 Boiler Room Hot Water Heater South Gate 8645 32" diameter x 12' long HSB P 6 Boiler RoomHot Water Circulation PumpB&G BF-105-LW115 V/ 0.46 AmpsSB P 5 Boiler RoomHot Water Circulation PumpB&G MBF-105-LW115 V/ 0.46 AmpsGRF 1Basement Fan RoomGym Return Fan Utility 4-22-10 6 1/2 E10.0 HP/ 480 V/ 1185 RPM/ 91.7%Indirect H20 heater, Horizontal mountnot usednot usednot usedJuneau Douglas High School 46 Energy Audit (November 2011)
MotorHP / Volts / RPM / EfficJuneau Douglas High School - Major Equipment InventoryCapacityNotesUnit ID Location Function Make ModelD P 5Basement Fan RoomLocker Room Heat ExchangeB&G CP7965-02D30 70 gpm2 HP/ 480 V/ 1725 RPM/ 86.5%D P 6Basement Fan RoomLocker Room Heat ExchangeB&G CP7965-01D30 70 gpm2 HP/ 480 V/ 1725 RPM/ 86.5%DHE 3Basement Fan RoomLocker Room Heat ExchangeB&G Q-59788HSD GSF 1Basement Fan RoomGym Supply Fan Utility 4-2-410 7D20 HP/ 480 V/ 1180 RPM/ 92.4%T 1Basement Electrical RoomTransformer GE9T26B3080G261000 KVA No temp rise listedD SF 2Basement Fan RoomMusic Room Supply Pace A-20-FCS-1 7450 CFM @ 1.5" 5 HP/ 480 V/ 1750 RPM/ 89.5%D SF 3Basement Fan RoomNot UsedPace A-20-FC-1 7860 CFM @ 1.5 sp 5 HP/ 480 V/ 1740 RPM/ 87.5%D SF 4Basement Fan RoomAuxiliary Gym Pace A 30 FCS116800 CFM @ 1 1/2 sp 10 HP/ 480 V/ 1765 RPM/ 91.7%D RF 4Basement Fan RoomReturn Air to D SF 4 Loren Cook 3009 CLB-110 HP/ 480 V/ 1765 RPM/ 91.7%D SF 5Basement Fan RoomLocker Room Vent Pace A-18-FC-1 6900 CFM@ 1 1/2 sp 5 HP/ 480 V/ 1750 RPM/ 89%D SF 6Basement Fan RoomLocker Room Vent Pace A-18-FC-16500 CFM @ 1 1/2 sp5 HP/ 480 V/ 1750 RPM/ 89.5%D RF 2Basement Fan RoomReturn Fan for D SF 3D P 3Basement Fan RoomD RF 1Basement Fan RoomReturn Fan for D SF 21.5 HP/ 480 V/ 1750 RPM/78%E SF 2 North Fan Room Drama Room Pace A-22-FCS1 9600 CFM@ 1.5 sp 5 HP/ 1750 RPM/ 480 V/ 89.5%E RF 2 North Fan Room Drama Room Loren Cook 2109CLV-13 HP/ 480 V/ 1745 RPM/ 76.9%E SF 1 North Fan Room Auditorium Room Pace A-20-FCS1 8280 CFM @ 1.5" 5 HP/ 1740 RPM/ 480 V/ 89.5% E RF 1 North Fan Room Auditorium Room Loren Cook 2109CLV-13 HP/ 480 V/ 1745 RPM/ 76.9%HSE AUD RFFan RoomAuditorium Return FanUtility 4-19305 HP/ 480 V/ 1170 RPM/ 87.5%HWH 106Eye Wash Station HeaterBradford White10 gallon208 V/ 4500 WC P 1 106Eye Wash Station Circulation PumpB&G NBF-10S/LW115 V/ 0.42 Amps/ 52 WC SF 1 106Downstairs Business AreaPace B-22B-STV 7400 CFM @ 1.5" 5 HP/ 480 V/ 1750 RPM/ 89.5%not in usenot in useJuneau Douglas High School 47 Energy Audit (November 2011)
MotorHP / Volts / RPM / EfficJuneau Douglas High School - Major Equipment InventoryCapacityNotesUnit ID Location Function Make ModelC RF 1 106Return Fan for C SF 1 Pace U-20 B-STU 3500 CFM @ 1" 1.5 HP/ 480 V/ 1725 RPM/ 78%XFMR 2 117 ATransformer International 10910H3D 500 KVA150° C Temp RiseHWH 110 CustodialLife Skills Hot Water HeaterCitation WA3243 50 gallon4500 WB SF 1 117 Mechanical FACS Ventilation Pace 33SWS1AF 10635 CFM @ 1 3/8 7.5 HP/ 1760 RPM/ 480 V/ 91%B SF 2 117 Mechanical FACS Ventilation Pace 27SWS1-AF 6065 CFM @ 1 3/8 5 HP/ 480 V/ 1750 RPM/ 89.5%B RF 1 117 MechanicalReturn Air to BSF 1/ BSF 2Pace X36-SWS1-AF 13300 CFM @ 1 1/8 5 HP/ 1750 RPM/ 480 V/ 89.5%B EF 1 117 Mechanical Elevator Room Pace 11-9E-STD 600 CFM @ 0.82 1/2 HP/ 115 V/ 1725 RPM/47%A RF 2 Woodshop Return Air for A SF 2 Loren Cook 2109 CLV-1 5 HP/ 480 V/ 1750 RPM/ 89.5% Not usedA SF 2 WoodshopWoodshop Supply AlirPace B-20 FCS1 15500 CFM @ 1 1/2" 10 HP/ 480 V/ 1750 RPM/ 89.5%A HE 2 Woodshop Heat ExchangerA P 6 WoodshopHeat Exchange Glycol PumpITT1.5 HP/ 480 V/ 1725 RPM/79.1%DC 1 Woodshop Dust Collector AAF 1853126-0010.5 HP/ 480 V/ 1755 RPM/ 78.5%DC 2 Woodshop Dust Collector AAF 1853126-090.5 HP/ 480 V/ 1755 RPM/ 78.5% A HV 1 Welding Shop Welding Room Vent Pace2 HP/ 480 V/ 1745 RPM/80.8%A HV 2 Welding ShopSpray Booth Room VentPace B-16-FCS17.5 HP/ 480 V/ 745 RPM 85.5%A P 7 Welding Shop Heat Exchange Pump B&G 2BC7-35 HP/ 480 V/ 1740 RPM/ 85.5%A HE 3 Welding Shop Heat ExchangeA HE 1 Welding Shop Heat ExchangeEF 1 Welding Shop Welding Exhaust Air Pro 100012961.5 HP/ 480 V/ 1750 RPM/ 84%EF 2 Welding Shop Welding Exhaust Air Pro 100013124 HP/ 480 V/ 3510 RPM/ 87.5%EF 3 Welding Shop Welding Exhaust Air Pro 100013124 HP/ 480 V/ 3510 RPM/ 87.5%EF 4 Welding Shop Welding Exhaust Air Pro 100013204 HP/ 480 V/ 3510 RPM/ 87.5%7.5 HP/ 3450 RPM/ 87.5% (2 motors)7.5 HP/ 3450 RPM/ 87.5% (2 motors)Juneau Douglas High School 48 Energy Audit (November 2011)
MotorHP / Volts / RPM / EfficJuneau Douglas High School - Major Equipment InventoryCapacityNotesUnit ID Location Function Make ModelA RF 4 Welding Shop Return Air for A SF 2 Cook 20CBB1.5 HP/ 480 V/ 1750 RPM/ 79.1% A RF 1 237Return Air for A SF 1 Pace U3057D 9100 CFM 7.5 HP/ 480 V/ 1760 RPM/ 91%A HE 1 237Heat ExchangerA EF 6 237Art RoomsLoren Cook 15CBB1.5 HP/ 480 V/ 1750 RPM/ 86.5%A EF 8 237Art RoomsPace 5CF-73AMI 6600 CFM Motor not accessibleA EF 12 237Art RoomsPace SCE-85A 1200 CFM Motor not accessibleA SF 1 2372nd FloorPace D-20-FCS1 14900 CFM 10 HP/ 480 V/ 1750 RPM/ 90.2%A EF 5 237Art RoomsPace SCF-97BME 2400 CFM 3/4 HP/ 480 V/ 1750 RPM/82%A P 5 237Heat Exchange Pump Pace 2BC88F5 HP/ 480 V/ 1750 RPM/ 85.5%B AHU 2 319 A2nd Floor Offices Pace B18AFS1 10230 CFM 5 HP/ 480 V/ 1750 RPM/ 87.5%B SF 5 319 A3rd Floor Classrooms Pace B-20FSTD 13300 CFM 10 HP/ 480 V/ 1765 RPM/ 90.2%B RF 5 319 AReturn Air to B SF 5 Pace B-18AFSTD 10500 CFM 5 HP/ 480 V/ 1750 RPM/ 85.5%D EF 3 RoofBathroom Exhaust Loren Cook 80C2B1/6 HP/ 115 V/ 1725 RPMKitchenWare Washer3 HP/26.8 Amps/ 208 VKitchenConvection Oven23.33 KW3 HP/1208 VKitchenHot Plate5 KW24 Amps/ 208 V/ 1 PHKitchenBrazing Pan18 KW208 V/ 3 PHKitchenFryer System17 KW208 V/ 3 PHKitchenWalk In Cooler120 V/ 1 PHKitchenWalk In Freezer120 V/ 1 PHKitchenRefrigeration264 Amps/ 208 V/ 3 PHKitchenHot Pass Through7.1 Amps/ 120/208 V/ PHJuneau Douglas High School 49 Energy Audit (November 2011)
MotorHP / Volts / RPM / EfficJuneau Douglas High School - Major Equipment InventoryCapacityNotesUnit ID Location Function Make ModelKitchenDeli Serving Counter1/2 HP14 Amps/ 120 VKitchenHot Food Serving Counter3.7 Amps/ 208 V/ 3 PHKitchenSnack Serving Counter1.3, 2.5 KW 11.3 Amps/ 120/208 V/ 3 PHKitchenUtility Distribution System81 KW225 Amps/ 120/208 V/ 3 PHKitchenHand Sinks1.35 KW120 VKitchenRefrigerated Pass Through0.669 KW1/3 HP/ 8.3 Amps/ 120 VKitchenFreezer Pass Through1.058 KW1/2 HP/ 11.5 KW/ 120 VKitchenReach In Freezer1.37 KW3/4 HP/ 14.9 Amps/ 120 VKitchenHot Display Cabinet1.8 KW 9.7 Amps/ 120/208 VKitchenWarming Drawer0.9 KW4.3 Amps/ 208 VServer Room Space CoolingMitsubishi, Mr SlimPC 24GK12 Ton/ 24,400 BTU/H11.5 V/ 1 PH/ 60 HzRoom Temp Set @ 70° Juneau Douglas High School 50 Energy Audit (November 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
Juneau Douglas High School 51 Energy Audit (November 2011)