HomeMy WebLinkAboutSEA-AEE-Hoonah Pool and Gym 2012-EE
Hoonah Pool and Gym
Hoonah City School District
Funded by:
Final Report
November 2011
Prepared by:
Energy Audit
Table of Contents
Section 1: Executive Summary 3
Section 2: Introduction 7
Section 3: Energy Efficiency Measures 11
Section 4: Description of Systems 17
Section 5: Methodology 19
Appendix A: Energy and Life Cycle Cost Analysis 22
Appendix B: Energy and Utility Data 32
Appendix C: Equipment Data 39
Appendix D: Abbreviations 41
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
Hoonah Pool and Gym 1 FINAL Energy Audit (November 2011)
Section 1
Executive Summary
An energy audit of the Hoonah Pool and Gym 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 Hoonah Pool and Gym is a 27,725 square foot building that contains commons, concessions,
restrooms, locker rooms, a weight room, a classroom, a pool, a gym, storage spaces, and mechanical
support spaces.
Building Assessment
The following summarizes our assessment of the building.
Envelope
The exterior of the building was recently re-sided and is in excellent shape with the exception of the
lower section of the siding that was installed improperly. Maintenance staff has scheduled necessary
repairs with the siding contractor to correct this deficiency.
The exterior doors are not thermally broken. Future exterior door replacement selection should
include this feature. There are two exterior doors with single pane 12” x 12” glazings, one of which is
broken. The existing broken glazing should be repaired. Future door selections that include glazings
should always include high efficiency double pane glazing selections.
Windows are aluminum clad wood-frame single-pane units with interior removable storm windows.
Upgrading these units is outlined in Section 3, Energy Efficiency Measure 16.
Inspection of the attic above the upstairs weight room and storage area by audit staff revealed a 2’ x
4’ section of missing insulation and vapor barrier that allows air and heat from conditioned spaces to
flow from the interior of the building to the portion of the attic that is directly vented to the outside.
This should be repaired as soon as possible.
The exterior wall and ceiling of the natatorium incorporate a unique but potentially problematic
design. AHU-5 supplies heated outside air to a plenum space between the interior surface and the
insulated exterior wall cavity to preclude the movement of warm, moist pool air through the wall
assembly. The system is dependent upon continuously pressurizing the plenum with warm, dry air.
The AHU-5 supply air temperature was increased from 55°F to 85°F during the audit to ensure that
any leakage from the plenum will dry the insulated assembly.
Hoonah Pool and Gym 2 FINAL Energy Audit (November 2011)
Heating System
The building and the pool are heated by two fuel oil boilers that provide heat to five air handling unit
systems, fan coil units, the pool heating system, and perimeter hydronic systems.
At the time of the audit Boiler #3 was running and Boiler #4 was on-line and not isolated. Circulating
heating water through a non-necessary boiler results in a significant amount of heat losses. This is
covered with recommendations in the report. The temperature band for the lead and lag boilers was
set at 160°F – 180°F for the lead boiler and 150°F – 170°F for the lag boiler. A 30° delta T should be
utilized to reduce boiler cycles and optimize boiler efficiency, i.e. 150° F – 180°F and 140°F to
170°F.
The domestic hot water system is oversized and inefficient. The oil-fired hot water heater is past its
useful life. These components should be replaced with two indirect hot water tanks in the proposed
renovation project.
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
the Energy Efficiency Measures section of this report.
A much cheaper heated water source under the IPEC waste heat project appears to soon
be a reality. The pool and gym building will be allowed a flow of 55 gpm or 550 MBH.
This heat can be interrupted by the utility at any time and the available capacity is less
than the heating load on cold days. As such, a fuel oil boiler must remain in standby
mode to operate when needed.
The waste heat system should not only be viewed as a potential operational savings, but
should also represent an opportunity to use these operational savings as a capital
funding source to upgrade and improve the efficiency of the building. Opportunities
include:
Optimize control sequences for the HVAC systems
Replace the domestic hot water system with two indirect hot water tanks.
Continuing efforts to reduce all building heating loads as much as possible so
the waste heat system can supply a greater percentage of the heating load.
Hoonah Pool and Gym 3 FINAL Energy Audit (November 2011)
Ventilation System
The building ventilation systems consists of five large air handling units, one supply fan, and one
exhaust fan for the purposes of heating and cooling spaces and improving building air quality. The
overall condition of the ventilation systems is good and routine preventive maintenance tasks are
being scheduled and performed.
The natatorium air handling unit AHU-2 humidity sensor is not operating properly and the heating
coil is unable to maintain the setpoint of 88°F. The turn vanes on EF-2 are not operating properly.
The supply air setpoint for AHU-5 which also provides heated outside air to the natatorium was
raised from 55°F to 85°F to preclude condensation in the ceiling and wall cavities.
Audit staff were impressed by the pool cover system that is in use at the facility. The cover deploys
and retracts easily and reduces energy use by minimizing evaporative heat loss and the subsequent
need for ventilation air to control humidity.
Lighting
Interior lighting consists primarily of T12 and metal halide lighting. Exterior lighting consists
primarily of metal halide lighting. Because lighting operational hours are controlled by staff,
operational costs for lighting with existing infrastructure are kept to a minimum. Replacement of
existing fixtures with more efficient units and the addition of occupancy sensors are solutions for
further reductions in operational costs.
Exterior lighting is unevenly distributed. Portions of the perimeter of the building are too bright while
other portions are too dark.
Summary
It is the assessment of the energy audit team that the majority of the building energy losses are due to
the need to optimize ventilation rates and schedules in accordance with occupancy followed by a
retro-commissioning of the ventilation equipment, boiler and boiler pump setpoints and controls, the
inefficient T12 fluorescent lighting, and the metal halide pendant lighting in the pool and gym areas.
These measures cannot be corrected by operational modifications alone.
The Pool and Gym building is covered under the Power Cost Equalization program which reduces
electrical costs paid directly paid by the Hoonah City School District from $0.62/kwh to $0.16/kwh.
While the school may pay only $0.16/kwh for the electricity to operate the Gym and Pool Building,
the true cost of energy to the community of Hoonah and the State of Alaska is still the $0.62/kwh rate.
Energy efficiency measures discussed within this report are based on the higher rate. There are two
very fundamental reasons for this approach; first, any electrical savings that can be identified under
the higher rate at the Gym and Pool Building will allow Hoonah to apply their available funding
under the PCE program to additional community-use buildings. Secondly, an approach based on
preserving all sources of funding that are used to pay the Gym and Pool electrical utility bills –
including State subsidies under the PCE program – will support the longer-term sustainability of the
PCE program. It must be recognized that the PCE program is subject to funding and political changes.
Long-term operational decisions should be evaluated with this in mind.
Hoonah Pool and Gym 4 FINAL Energy Audit (November 2011)
Energy Efficiency Measures (EEMs)
All buildings have opportunities to improve their energy efficiency. The energy audit revealed several
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: Re-install Attic Insulation
EEM-2: Replace Domestic Hot Water System
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-3: Perform a Boiler Combustion Test $700 $16,300 ($47,300) ($30,300) 44.3
EEM-4: Replace Aerators $1,400 $0 ($19,100) ($17,700) 13.6
EEM-5: Install Lobby Lighting Switch $3,600 ($700) ($23,200) ($20,300) 6.6
EEM-6: Optimize All Ventilation Systems $172,300 $8,500 ($1,121,900) ($941,100) 6.5
EEM-7: Install Domestic HWRP Control $500 $0 ($2,900) ($2,400) 5.8
EEM-8: Upgrade Motors to Premium Efficiency $12,600 $0 ($72,200) ($59,600) 5.7
EEM-9: Install Auto Valves on Unit Heaters $3,900 $0 ($19,900) ($16,000) 5.1
Medium Priority
EEM-10: Install Modulating Boiler Burners $39,000 $17,000 ($141,900) ($85,900) 3.2
EEM-11: Isolate Lag Boiler $19,100 $0 ($55,500) ($36,400) 2.9
EEM-12: Upgrade Gym Lighting $23,400 ($1,700) ($58,100) ($36,400) 2.6
EEM-13: Install Toilet Room Occupancy Sensors $3,600 ($200) ($5,100) ($1,700) 1.5
EEM-14: Upgrade Pool Lighting $17,100 ($1,000) ($22,800) ($6,700) 1.4
EEM-15: Upgrade Interior Lighting $40,300 ($5,500) ($44,400) ($9,600) 1.2
EEM-16: Replace Single-pane Windows $49,400 $0 ($56,000) ($6,600) 1.1
Total* $386,900 $32,700 ($1,690,300) ($1,270,700) 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.
Hoonah Pool and Gym 5 FINAL Energy Audit (November 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.
Hoonah Pool and Gym 6 FINAL Energy Audit (November 2011)
Section 2
Introduction
This report presents the findings of an energy audit of the Hoonah Gym and Pool located in Hoonah,
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 Hoonah Gym and Pool is a 27,725 square foot building that contains commons, concessions,
restrooms, locker rooms, a weight room, a classroom, a pool, a gym, storage spaces, and mechanical
support spaces.
The pool equipment and ventilation systems are operated continuously to maintain water and indoor
air quality. The pool facilities are utilized by approximately 30 children for a one-hour open swim and
six adults for a one-hour lap swim every Tuesday, Thursday, and Saturday. In addition, 15 children
attend one-hour swim lessons on Tuesday and Thursday.
The Gym facilities are used for three classes during the school day, a session of open gym after
school, and for school sporting activities until approximately 7:00 pm every evening.
The facility is scheduled in the following manner:
Pool: 5:00 pm – 6:00 pm (T, Th, Sa) Kids Open Swim
7:00 pm – 8:00 pm (T, Th, Sa) Adult Lap Swim
Gym: 8:00 am – 10:15 am (M-F) Class
11:30 am – 12:00 pm (M-F) Class
2:00 pm – 3:15 pm (M-F) Class
3:15 pm – 4:00 pm (M-F) Open Gym
4:00 pm – 5:00 pm (M-F) Wrestling Practice
5:00 pm – 7:00 pm (M-F) Volleyball Practice
Building History
1985 – Original Construction of Pool
2005 – Remodel and Gym Addition
2011 – Re-siding Project
Hoonah Pool and Gym 7 FINAL 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 87,000 kWh $54,500 300 16%
Fuel Oil 11,900 Gallons $55,100 1,620 84%
Totals $109,600 1,920 100%
Electricity
This chart shows electrical energy use from 2007 to 2010.
The following observations are noted from the data:
The spike in consumption during July 2007 was due to an increase in system operating hours
during an automatic control modification project.
Electricity use dropped significantly in 2009 when effective energy conservation measures
were put into effect by maintenance staff.
Consumption increased slightly in 2010 due to scaling back of some of the energy
conservation measures.
The effective cost—energy costs plus demand charges—is 62.6¢ per kWh. The Power Cost
Equalization program reduces the cost to the community to 16¢ per kWh.
Hoonah Pool and Gym 8 FINAL Energy Audit (November 2011)
Fuel Oil
This chart shows heating
energy use from 2007 to
2010. The chart
compares annual use
with the heating degree
days (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.
Fuel oil consumption decreased in 2009 due to implementation of energy efficiency measures by
maintenance staff. The slight increase in 2010 was due to scaling back on some of the efficiency
measures.
Water Use
Prior to operation of the pool,
annual water consumption
averaged 4,500 gallons per
month. Usage has increased to
25,000 gallons per month. The
increase is due to pool
evaporation, filter backwashing,
and showers. The annual water
consumption trend is at the
right. The 2011 usage includes a
100,000 gallon spike in the
months preceding pool opening
for cleaning and filling the pool.
Pool Energy Use
The pool was returned to service in June of 2011. Heating the pool and operating the ventilation
systems will increase energy consumption. A review of the available data from June to September,
2011 shows that electricity use increased by 3,300 kWh per month and fuel oil use increased by 440
gallons per month. While the electricity consumption can be assumed to be consistent through the
year, fuel oil use will increase during the winter. A rough prediction shows that fuel oil use is likely to
increase by 21,000 gallons per year to heat the pool. The total cost at current energy costs is estimated
at $122,000 per year.
Hoonah Pool and Gym 9 FINAL Energy Audit (November 2011)
Cost of Heat
The current cost of fuel oil in Hoonah is $4.63 per gallon. Assuming a fuel oil conversion efficiency
of 70% and an electric boiler conversion efficiency of 95%, oil heat at $4.63 per gallon equates to
$47.76 MMBtu Since the current cost of electricity at 62.6¢ per kWh equates to $193.28 per MMBtu,
fuel oil heat is much less expensive than electric heat.
IPEC Waste Heat
The Inside Passage Electrical Cooperative will be installing a waste heat recovery system where they
will sell hydronic heating water to the pool and gym building. A cost comparison between fuel oil
boiler heat and IPEC waste heat is:
Fuel Oil Boilers: $4.63 per gallon x 138.5 kBtu/gallon / 70% efficiency=$47.76 per MMBtu.
IPEC: 1 MMBtu / 114,000 Btu/gal x 50% x $4.02 per gallon = $17.63 per MMBtu
The IPEC waste heat will cost 37% of the cost of fuel oil boiler heat, a significant savings.
Hoonah Pool and Gym 10 FINAL 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 will be 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: Re-install Attic Insulation
Purpose: Inspection of the attic above the upstairs weight room and storage area by audit staff
revealed a 2’ x 4’ section of missing insulation and vapor barrier that was allowing air
and heat from conditioned spaces to flow from the interior of the building to the portion
of the attic that is directly vented to the outside. Energy will be saved if the insulation is
replaced, the vapor barrier re-sealed, and the drywall reinstalled.
Scope: Replace insulation, re-seal vapor barrier, and reinstall drywall over 2’ x 4’ opening
above second floor weight room attic.
EEM-2: Replace Domestic Hot Water System
Purpose: The existing domestic hot water system consists of a 125-gallon direct fired tank and a
large remote hot water storage tank. The system is oversized and the oil-fired hot water
heater is past its useful life.
Scope Replaced the system with two indirect hot water heaters that are connected to the boiler
plant. In addition to the energy savings associated with less tank losses and cycling
losses, this system will have less maintenance and repair costs.
Hoonah Pool and Gym 11 FINAL 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-3: Perform a 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 ($1,670) ($710) $700 $16,300 ($47,300) ($30,300) 44.3
EEM-4: Replace Aerators
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 ($670) ($670) $1,400 $0 ($19,100) ($17,700) 13.6
EEM-5: Install Lobby Lighting Switch
Purpose: Lighting in the main corridors is currently controlled from one switch. During school
hours, all of the corridor lighting is on even though most of the traffic is through the
lobby directly into the gym. Putting a few lobby fixtures on a separate switch will allow
the lobby to be lit while the corridor lighting remains off.
Scope: Install and wire a light switch to control a few of the lobby light fixtures.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
($40) ($1,320) ($1,360) $3,600 ($700) ($23,200) ($20,300) 6.6
Hoonah Pool and Gym 12 FINAL Energy Audit (November 2011)
EEM-6: Optimize All Ventilation Systems
Purpose: The building utilizes fixed-flow heating and ventilation system units to provide
conditioned air to interior spaces from 6:00 am to 9:00 pm (M-F) and as needed on
weekends for events in the Gym and Pool areas. Under most conditions the space
occupancy throughout the majority of these operational hours is well below the setpoint
of the air handling systems. This results in an unnecessarily high fuel and electric
demand to support school operations. Energy will be saved if modifications are made to
the respective air handling systems to reduce air flow when not needed.
Scope: Perform repairs as follows and retro-commission all air handling units to perform as a
properly integrated system when completed:
i. AHU-1 and EF-1 (Locker Rooms): Turn off during unoccupied periods.
Eliminate night setback control so heating does not occur using 100% outside air.
Modulate EF-1 to maintain Natatorium at negative pressure. Calibrate
thermostats.
ii. AHU-2 and EF-2 (Natatorium): Install VFD for AHU-2 and EF-2 to reduce air
flow during unoccupied periods when pool evaporation is minimal due to the
pool cover. Increase the natatorium temperature – the current heating coil is not
able to maintain the room setpoint – to further reduce evaporation. Replace failed
humidity sensor.
iii. AHU-3 (Gym): Calibrate the existing CO2 sensor control so it properly
modulates outside air flow and install a VFD to modulate air flow with cooling
loads. Optimize schedules with current use.
iv. AHU-4 (Weight Room and Classroom): Install occupancy sensor controls to
operate the fan only when either room is occupied. Increase setback temperature
during occupied hours by allowing it to increase temperature during the school
day and control the fan (and ventilation) from an occupancy sensor.
v. Retro-commissioning: Perform an integrated building-wide retro-commissioning
upon completion of optimization of control sequences.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$500 ($45,430) ($44,930) $172,300 $8,500 ($1,121,900) ($941,100) 6.5
EEM-7: Install Domestic HWRP Thermostat Control
Purpose: The domestic hot water recirculating pump currently operates continuously to circulate
heated domestic hot water through the piping system regardless of demand or system
temperature. Energy will be saved if a thermostat is installed to operate the pump when
the loop temperature drops below the setpoint.
Scope: Install thermostat to control operation of hot water return pump.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($170) ($170) $500 $0 ($2,900) ($2,400) 5.8
Hoonah Pool and Gym 13 FINAL Energy Audit (November 2011)
EEM-8: Upgrade Motors to Premium Efficiency
Purpose: The equipment inspection identified six motors that could be upgraded with premium
efficiency models to save energy. They are:
AHU-2 EF 5 HP
AHU-4 SF 1 HP
AHU-4 EF 1 HP
AHU-5 1 HP
Pool Pump 7.5 HP
CP-1/CP-2 2 HP
Scope: Replace identified motors with premium efficiency motors.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($4,120) ($4,120) $12,600 $0 ($72,200) ($59,600) 5.7
EEM-9: Install Automatic Valves on Unit Heaters
Purpose: Energy will be saved if the six wall- and ceiling-mounted fan coil unit heaters have
automatic valves that shut off the heating flow when heat is not needed. Currently the
coils in the unit heaters are continuously hot and the thermostats turn on the fans to
supply the heat to the rooms. When heat is not needed, convective heat loss from the
coils occurs; some of the heat loss may be useful, but a large percentage is not.
Scope: Install automatic valves in the heating supply to each unit heater and control the valves
from the fan thermostats.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($700) ($700) $3,900 $0 ($19,900) ($16,000) 5.1
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-10: Install Modulating Boiler Burners
Purpose: The boiler burners do not incorporate modulating burner controls. Energy will be saved
if the boiler firing rate is modulated as necessary.
Scope: Install a modulating burner on one of the boilers. Use this boiler as the standby boiler
when the IPEC waste heat system is installed.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$1,000 ($5,010) ($4,010) $39,000 $17,000 ($141,900) ($85,900) 3.2
Hoonah Pool and Gym 14 FINAL Energy Audit (November 2011)
EEM-11: Isolate Lag Boiler
Purpose: Only one boiler is needed to meet the heating load; however, the lag boiler is not
isolated and remains hot. Circulating heating water through a lag boiler in a dual boiler
system can result in a 2% efficiency loss of the operable boiler due to the isolated
boiler acting as a heat sink. Energy will be saved by isolating the return valve on the
lag boiler
Scope: Install an automatic valve in the heating return to each boiler and interlock with the
boiler burner so the valve is fully open before the boiler fires.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($1,960) ($1,960) $19,100 $0 ($55,500) ($36,400) 2.9
EEM-12: Upgrade Gym Lighting
Purpose: Existing gym lighting utilizes 22 pendant-mounted metal halide bulbs to light the space
for approximately 2,000 hours per year to support school-hour class activities and after-
school sports and community events. Similar light levels can be achieved with multi-
lamp T5 lighting. Energy will be saved if the 22 metal halide light fixtures are replaced
with 6-bulb T5 units.
Scope: Replace the metal halide lights with 6-bulb T5 units.
EEM-13: Install Toilet Room Occupancy Sensors
Purpose: Lighting in the main toilet rooms are currently controlled with manual switching.
Energy will be saved if the lighting hours are reduced by installing occupancy sensors
in each toilet room.
Scope: Install occupancy sensors in the toilet rooms.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
($10) ($290) ($300) $3,600 ($200) ($5,100) ($1,700) 1.5
EEM-14: Upgrade Pool Lighting
Purpose: Existing pool lighting utilizes 16 pendant-mounted metal halide bulbs to light the space
for approximately 30 hours per week to support open swim hours and cleaning
operations. The existing fixtures also have a low efficacy. Similar light levels can be
achieved with multi-lamp T5 lighting. Energy will be saved if the 16 metal halide light
fixtures are replaced with T5 units.
Scope: Replace the metal halide lights with 6-bulb T5 units.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
($60) ($1,680) ($1,740) $17,100 ($1,000) ($22,800) ($6,700) 1.4
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
($100) ($3,550) ($3,650) $23,400 ($1,700) ($58,100) ($36,400) 2.6
Hoonah Pool and Gym 15 FINAL Energy Audit (November 2011)
EEM-15: Upgrade Interior Lighting
Purpose: The majority of the interior lighting consists of T12 fluorescent fixtures. Energy will be
saved if more efficient T8 and compact fluorescent bulbs are used.
Scope: Replace the existing T12 fixtures with more efficient T8 fixtures.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
($320) ($3,050) ($3,370) $40,300 ($5,500) ($44,400) ($9,600) 1.2
EEM-16: Replace Single-Pane Windows
Purpose: The north wall windows are single pane glazing with interior storm windows with an
insulation value of approximately R-1.25. Energy will be saved if these are removed
and replaced with energy efficient R-3 double pane glazing.
Scope: Replace single pane glazing with energy efficient double pane glazing units.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($1,980) ($1,980) $49,400 $0 ($56,000) ($6,600) 1.1
LOW PRIORITY
Low priority EEMs do not offer a life cycle energy savings and are not recommended.
EEM-17: Boiler Room Heat Recovery
Purpose: The boiler room utilizes supply air from SF-1 and exhausts air through EF-5 in the fan
room. Energy would be saved if the heat generated from the boiler room was recovered
from EF-5 and utilized within the building envelope.
Scope: Install a heat recovery unit in the fan room space to supply heat from the boiler space
through EF-5 to the adjacent air handling unit AHU-1.
This EEM is not recommended because the IPEC waste heat recovery system will
make it possible to significantly reduce the heat loss in the boiler room by doing the
following:
- Insulating the waste heat exchanger and piping to current standards.
- Isolating the standby when it is not needed to minimize heat loss from the jacket.
Hoonah Pool and Gym 16 FINAL 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 Section 3, Energy Efficiency Measure.
Building Envelope
R-value
Component Description (inside to outside) Existing Optimal
Exterior Wall 5/8” Gyp. Bd, 2”x 12” wood studs w/ R-38 batt, cement board,
siding R-38 R-26
Roof (Gym & Pool) 24” o.c. trusses w/ R-38 batt, 2-layers ½” drywall R-38 R-46
Roof (North Entry) 24” o.c. trusses w/ R-30 batt, 5/8” drywall R-30 R-46
Floor Slab 4” Concrete slab-on-grade R-10 R-10
Foundation 8” concrete with 2” rigid insulation on interior surface R-10 R-20
Windows Aluminum clad wood frame single pane w/ storm windows R-1.25 R-5
Doors Steel doors w/ non-thermally broken frames R-1.5 R-5
Heating System
The building and the pool are heated by two fuel oil boilers that provide heat to five air handling unit
systems, fan coil units, the pool heat exchanger system, and perimeter hydronic systems. The heating
system has the following pumps:
CP-1 is a building hydronic heating pump
CP-2 is a building hydronic heating pump
CP-3 is a hydronic heating circulation pump for pool deck radiant floor heating
CP-4 is a hydronic heating circulation pump for pool deck radiant floor heating
HWRP-1 is a domestic hot water recirculation pump
Pump THWRP-1 is a tempered hot water recirculation pump
Hoonah Pool and Gym 17 FINAL Energy Audit (November 2011)
Ventilation Systems
Area Fan System Description
Lobby/Locker Rooms AHU-1 2,720 cfm supply, 2,920 cfm exhaust, constant volume air
handling unit consisting of a heating coil, mixing box, filter
section, heat recovery coil, supply fan, and exhaust fan
Natatorium AHU-2 4,740 cfm supply, 6,600 cfm exhaust, constant volume air
handling unit consisting of a heating coil, mixing box, filter
section, heat recovery coil, supply fan, and exhaust fan
Gym AHU-3 10,000 cfm supply, 10,000 cfm exhaust, constant volume air
handling unit consisting of a heating coil, filter section, supply
fan, and exhaust fan
Weight Room/Classroom AHU-4 2,120 cfm supply fan, 2,120 cfm exhaust fan, constant volume
air handling unit consisting of a heating coil, filter section,
supply fan, and return fan
Natatorium AHU-5 1,260 cfm constant volume air handling unit, supplying the
wall and ceiling plenum, consisting of a heating coil, filter
section, and supply fan
Boiler Room SF-1 Constant volume boiler room supply air fan
Locker Rooms EF-1 Constant volume locker room exhaust fan
Natatorium EF-2 Variable flow return/exhaust fan that modulates to maintain
the Natatorium at a negative pressure to the adjacent spaces
Boiler Room EF-5 Constant volume boiler room exhaust air fan
Domestic Hot Water System
The domestic hot water system consists of one 250-gallon oil-fired water heater and one large
insulated storage tank that supplies domestic hot water to the fixtures and showers. The capacity of
the system is greatly oversized. A significant savings can be shown in the right-sizing of the system to
support current facility use. These components should be replaced with two indirect hot water tanks.
The water conservation efficiency of the lavatory aerators and the showerheads can be improved.
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 handling systems.
Lighting
Interior lighting consists primarily of T12 and metal halide lighting. Exterior lighting primarily
consists of metal halide lighting and three new LED wall units. The interior lighting schedules and all
exterior lighting - to include the perimeter lighting, is controlled by staff. As a result, lighting
operational hours and subsequent electrical demand are kept to a minimum with the existing fixtures.
An upgrade of the existing lighting fixtures to more efficient models represents the best opportunity
to reduce lighting electrical demand.
Electric Equipment
No significant electrical equipment was noted beyond that necessary for building and pool support
infrastructure.
Hoonah Pool and Gym 18 FINAL 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.
Hoonah Pool and Gym 19 FINAL 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 2010.
Fuel Oil
Fuel oil currently costs $4.63 per gallon for #2 fuel oil. The analysis is based on 6% fuel oil inflation
which has been the average for the past 20-years.
Hoonah Pool and Gym 20 FINAL Energy Audit (November 2011)
Electricity
Electricity is supplied by Inside Passage Electrical Cooperative. The building is billed for electricity
under the Large Commercial Rate. 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.
The building is included in the Power Cost Equalization program which reduces electrical rates
directly paid by the Hoonah City School District from $0.62/kwh to $0.16/kwh. While the school may
only pay $0.16/kwh for the electricity to operate the Gym and Pool Building, the true cost of energy
to the community of Hoonah and the State of Alaska is still the $0.62/kwh rate.
Inside Passage Electric Cooperative
Large Commercial Rate
Electricity $ / kwh $0.5522
Demand ( $ / kW ) $12.29
Customer Charge ( $ / mo ) $50.00
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 $0.626/kwh
General Inflation Rate 2% Electricity Inflation 2%
Fuel Oil Cost (2012) $4.91/gal Fuel Oil Inflation 6%
Hoonah Pool and Gym 21 FINAL Energy Audit (November 2011)
Appendix A
Energy and Life Cycle Cost Analysis
Hoonah Pool and Gym 22 FINAL 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
Building Name
Basis
Economic
Study Period (years) 25 Nominal Discount Rate 5%General Inflation 2%
Energy
2011 $/gal Fuel Inflation 2012 $/gal
Fuel Oil $4.63 6% $4.91
Electricity $/kWh (2011)$/kW (2011)Inflation $/kWh (2012)$/kW (2012)
w/ Demand Charges $0.552 $12.29 2% $0.563 $12.54
w/o Demand Charges $0.626 -2% $0.639 -
EEM-3: Perform a Boiler Combustion Test
Energy Analysis
Annual Gal % Savings Savings, Gal
34,000 -1.0% -340
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Purchase combustion analyzer 0 1 LS $700 $700
Annual Costs
Clean Boiler / Combustion test 1 - 25 16 hrs $60.00 $16,346
Energy Costs
Fuel Oil 1 - 25 -340 gal $4.91 ($47,297)
Net Present Worth ($30,300)
EEM-4: Replace Aerators
Energy Analysis
η boiler 68%
Fixture Existing Proposed Uses/day Days Water,Gals % HW kBTU Gallons
Showerhead 20.0 15.0 30 156 -23,400 80% -12,490 -133
Lavatories 0.3 0.2 30 156 -842 80% -450 -5
-24,242 -137
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace lavatory aerators 0 15 ea $35 $525
Replace showerhead 0 25 ea $35 $875
Energy Costs
Fuel Oil 1 - 25 -137 gal $4.91 ($19,113)
Net Present Worth ($17,700)
Gallons per Use
Hoonah Pool and Gym 23 FINAL 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
Building Name
EEM-5: Install Lobby Lighting Switch
Energy Analysis
# Fixtures Lamp Lamp, watts Fixture Watts Hours, exist Hours, new Savings, kWh
15 2T12 80 92 -1,500 0 -2,070
-2,070
Lamp Replacement
# Fixtures Lamp # Lamps Life, hrs Lamps//yr $/lamp $/Replace
15 2T12 2 20,000 -2.25 $4 $15
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install and wire light switch 0 1 LS $2,000 $2,000
Estimating contingency 0 15%$300
Overhead & profit 0 30%$690
Design fees 0 10%$299
Project management 0 8%$263
Annual Costs
Lamp replacement 1 - 25 -2.25 lamps $19.00 ($728)
Energy Costs
Electric Energy (Effective Cost)1 - 25 -2,070 kWh $0.639 ($23,167)
Net Present Worth ($20,300)
Hoonah Pool and Gym 24 FINAL 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
Building Name
EEM-6: Optimize All Ventilation Systems
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
AHU-1 Existing -2,720 2.50 55%-2 89% -1.6 8,760 -14,283
Optimized 2,720 2.50 55%2 89% 1.6 1,500 2,446
EF-1 Existing -2,000 2.50 55%-1 87% -1.2 8,760 -10,744
Optimized 2,000 2.50 55%1 87% 1.2 1,500 1,840
AHU-2 Existing -4,740 2.75 55%-4 91% -3.1 8,760 -26,777
Optimized 4,740 2.75 55%4 91% 3.1 8,760 26,777
AHU-3 Existing -12,620 1.50 55%-5 91% -4.4 2,000 -8,878
Optimized 8,000 1.00 55%2 91% 1.9 2,000 3,752
AHU-4 Existing -1,400 1.75 50%-1 86% -0.7 2,000 -1,345
Optimized 1,400 1.75 50%1 86% 0.7 1,000 673
-2.6 -26,540
Ventilation SA CFM MAT T,room MBH Hours kBtu η boiler Gallons
AHU-1 Existing -2,720 55 70 -44 8,760 -386,001 68%-4,099
Optimized 2,720 55 70 44 1,500 66,096 68%702
AHU-3 Existing -12,600 55 68 -177 2,000 -353,808 68%-3,757
Optimized 8,000 62 68 52 2,000 103,680 68%1,101
AHU-4 Existing -1,400 65 70 -8 2,000 -15,120 68%-161
Optimized 1,400 65 70 8 1,000 7,560 68%80
-577,593 -6,133
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Optimize AHU-1 controls 0 1 LS $10,000 $10,000
Optimize AHU-2 controls 0 1 LS $15,000 $15,000
Install VFD on AHU-2 and EF-2 0 2 LS $10,000 $20,000
Optimize AHU-3 controls 0 1 LS $12,000 $12,000
Install VFD on AHU-3 0 1 LS $10,000 $10,000
Optimize AHU-4 controls 0 1 LS $10,000 $10,000
Retrocommission systems 0 1 LS $20,000 $20,000
Estimating contingency 0 15% $14,550
Overhead & profit 0 30% $33,465
Design fees 0 10% $14,502
Project management 0 8% $12,761
Annual Costs
DDC Maintenance 1 - 25 1 LS $500.00 $8,514
Energy Costs
Electric Energy 1 - 25 -26,540 kWh $0.563 ($262,014)
Electric Demand 1 - 25 -31 kW $12.54 ($6,758)
Fuel Oil 1 - 25 -6,133 gal $4.91 ($853,138)
Net Present Worth ($941,100)
Hoonah Pool and Gym 25 FINAL 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
Building Name
EEM-7: Install Domestic HWRP Control
Energy Analysis
Watts Hours,ex Hours, new kWh
60 8,760 4,380 -263
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Thermostatic controller 0 1 ea $350 $350
Overhead & profit 0 30%$105
Energy Costs
Electric Energy (Effective Cost)1 - 25 -263 kWh $0.639 ($2,941)
Net Present Worth ($2,500)
EEM-8: Upgrade Motors to Premium Efficiency
Energy Analysis
Equip Number HP ηold ηnew kW Hours kWh
AHU-4 EF 1 1 74.0% 85.5% -0.09 1,440 -124
AHU-5 1 1 78.5% 85.5% -0.05 8,760 -457
AHU-4 SF 1 2 82.5% 86.5% -0.06 1,440 -86
CP-1/CP-2 2 2 78.5% 86.5% -0.24 4,380 -1,046
AHU-2 EF 1 5 81.0% 89.5% -0.32 8,760 -2,777
Pool Pump 1 7.5 86.5% 91.7% -0.29 8,760 -2,549
-1.0 -7,039
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs HP
Replace motor 1 0 2 LS 940 $1,880
Replace motor 2 0 3 LS 970 $2,910
Replace motor 5 0 1 LS 1,290 $1,290
Replace motor 7.5 0 1 LS 1,690 $1,690
Estimating contingency 0 5%$389
Overhead & profit 0 30%$2,448
Design fees 0 10%$1,061
Project management 0 8%$933
Energy Costs
Electric Energy 1 - 25 -7,039 kWh $0.563 ($69,487)
Electric Demand 1 - 25 -13 kW $12.54 ($2,754)
Net Present Worth ($59,600)
EEM-9: Install Automatic Valves on Unit Heaters
Energy Analysis
Loss, BTUH Number Factor Loss, kBTU Boiler Effic Fuel, gals
-1,000 6 25% -13,140 68% -143
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install automatic valves and connect to fan wiring 0 6 ea $500 $3,000
Overhead & profit 0 30%$900
Energy Costs
Fuel Oil 1 - 25 -143 gal $4.91 ($19,912)
Net Present Worth ($16,000)
Hoonah Pool and Gym 26 FINAL 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
Building Name
EEM-10: Install Modulating Boiler Burners
Energy Analysis
Annual Gal % Savings Savings, Gal
34,000 -3.0% -1,020
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install modulating burner 0 2 LS $15,000 $30,000
Overhead & profit 0 30%$9,000
Annual Costs
Burner maintenance 1 - 25 2 LS $500.00 $17,027
Energy Costs
Fuel Oil 1 - 25 -1,020 gal $4.91 ($141,892)
Net Present Worth ($85,900)
EEM-11: Isolate Lag Boiler
Energy Analysis
Boiler Input MBH Loss %Loss MBH Hours, exist Hours, new kBtu η boiler Gallons
B-1 857 1.0%9 8,760 4,380 -37,543 68%-399
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install AV in heating return 0 2 ea $6,000 $12,000
Controls 0 2 ea $1,000 $2,000
Estimating contingency 0 5% $700.00
Overhead & profit 0 30% $4,410.00
Energy Costs
Fuel Oil 1 - 25 -399 gal $4.91 ($55,453)
Net Present Worth ($36,300)
Hoonah Pool and Gym 27 FINAL 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
Building Name
EEM-12: Upgrade Gym Lighting
Energy Analysis
Electric Savings
Fixture Number Hours Lamp Fixture Watts Lamp Fixture Watts kW kWh
Pendent 22 2,000 MH 500 T5 360 -3.1 -6,160
Additional Heating Load
kWh Factor kBtu η boiler Gallons
6,160 35% 7,356 68% 78
Lamp Replacement
Type # Fixtures Lamp # Lamps Life, hrs Lamps//yr $/lamp Labor/lamp
Pendent 22 MH -1 15,000 -3 $40 $30.00
Pendent 22 T5 6 36,000 7 $1.50 $5.00
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace light fixtures with T5 fixtures 0 22 LS $600 $13,200
Estimating contingency 0 15% $1,980.00
Overhead & profit 0 30% $4,554.00
Design fees 0 10%$1,973
Project management 0 8%$1,737
Annual Costs
MH lamp replacement 1 - 25 -3 lamps $70.00 ($3,496)
T5 lamp replacement 1 - 25 7 lamps $14.00 $1,748
Energy Costs
Water 1 - 25 kgals $10.960 $0
Electric Energy 1 - 25 -6,160 kWh $0.563 ($60,814)
Electric Demand 1 - 25 -37 kW $12.54 ($8,121)
Fuel Oil 1 - 25 78 gal $4.91 $10,866
Net Present Worth ($36,400)
EEM-13: Install Toilet Room Occupancy Sensors
Energy Analysis
# Fixtures Lamp Lamp, watts Fixture Watts Hours, exist Hours, new Savings, kWh
5 2T12 80 92 -1,500 500 -460
-460
Lamp Replacement
# Fixtures Lamp # Lamps Life, hrs Lamps//yr $/lamp $/Replace
5 2T12 2 20,000 -0.50 $4 $15
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install occupancy sensors 0 2 LS $1,000 $2,000
Estimating contingency 0 15%$300
Overhead & profit 0 30%$690
Design fees 0 10%$299
Project management 0 8%$263
Annual Costs
Lamp replacement 1 - 25 -0.50 lamps $19.00 ($162)
Energy Costs
Electric Energy (Effective Cost)1 - 25 -460 kWh $0.639 ($5,148)
Net Present Worth ($1,800)
Existing Replacement Savings
Hoonah Pool and Gym 28 FINAL 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
Building Name
EEM-14: Upgrade Pool Lighting
Energy Analysis
Electric Savings
Fixture Number Hours Lamp Fixture Watts Lamp Fixture Watts kW kWh
Surface 16 1,560 MH 500 T5 360 -2.2 -3,494
Additional Heating Load
kWh Factor kBtu η boiler Gallons
3,494 100% 11,923 68% 127
Lamp Replacement
Type # Fixtures Lamp # Lamps Life, hrs Lamps//yr $/lamp Labor/lamp
Surface 16 MH -1 15,000 -2 $40 $30.00
Surface 16 T5 6 36,000 4 $1.50 $5.00
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace light fixtures with T5 fixtures 0 16 LS $600 $9,600
Estimating contingency 0 15% $1,440.00
Overhead & profit 0 30% $3,312.00
Design fees 0 10%$1,435
Project management 0 8%$1,263
Annual Costs
MH lamp replacement 1 - 25 -2 lamps $70.00 ($1,983)
T5 lamp replacement 1 - 25 4 lamps $14.00 $992
Energy Costs
Water 1 - 25 kgals $10.960 $0
Electric Energy 1 - 25 -3,494 kWh $0.563 ($34,498)
Electric Demand 1 - 25 -27 kW $12.54 ($5,906)
Fuel Oil 1 - 25 127 gal $4.91 $17,611
Net Present Worth ($6,700)
Existing Replacement Savings
Hoonah Pool and Gym 29 FINAL 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
Building Name
EEM-15: Upgrade Interior Lighting
Energy Analysis
Electric Savings
Fixture Number Hours Lamp Fixture Watts Lamp Fixture Watts kW kWh
Recessed 4 1,560 1T12 46 1T8 35 0.0 -69
Recessed 168 1,560 2T12 92 2T8 72 -3.4 -5,242
Recessed 12 1,560 3T12 138 3T8 107 -0.4 -580
-3.8 -5,891
Additional Heating Load
kWh Factor kBtu η boiler Gallons
5,891 80% 16,079 68% 171
Lamp Replacement
Type # Fixtures Lamp # Lamps Life, hrs Lamps//yr $/lamp Labor/lamp
Recessed 4 1T12 -1 20,000 -1 $3 $5.00
Recessed 168 2T12 -2 20,000 -74 $3 $5.00
Recessed 12 3T12 -4 20,000 -11 $3 $2.50
Recessed 4 1T8 1 36,000 0 $4 $5.00
Recessed 168 2T8 2 36,000 41 $4 $5.00
Recessed 12 3T8 4 36,000 6 $4 $2.50
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace 1T12 ballast and lamp with T8 0 4 LS $144 $576
Replace 2T12 ballast and lamps with T8 0 168 LS $148 $24,864
Replace 3T12 ballast and lamps with T8 0 12 LS $156 $1,872
Estimating contingency 0 5% $1,365.60
Overhead & profit 0 30% $8,603.28
Project management 0 8%$2,982
Annual Costs
Existing lamp replacement, incandescent 1 - 25 -1 lamps $8.00 ($119)
Existing lamp replacement, 2T12 1 - 25 -74 lamps $11.00 ($13,782)
Existing lamp replacement, 4T12 1 - 25 -11 lamps $14.50 ($2,595)
Lamp replacement, CFL 1 - 25 0 lamps $9.00 $75
Lamp replacement, 2T8 1 - 25 41 lamps $13.00 $9,049
Lamp replacement, 4T8 1 - 25 6 lamps $18.50 $1,840
Energy Costs
Electric Energy 1 - 25 -5,891 kWh $0.563 ($58,154)
Electric Demand 1 - 25 -45 kW $12.54 ($9,956)
Fuel Oil 1 - 25 171 gal $4.91 $23,749
Net Present Worth ($9,600)
Existing Replacement Savings
Hoonah Pool and Gym 30 FINAL 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
Building Name
EEM-16: Replace Single-pane Windows
Energy Analysis
Component Area R,exist R,new ΔT MBH kBtu η boiler Gallons
Windows 371 1.25 3.0 25 -4.3 -37,916 68%-403
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace window glazing unit 0 371 sqft $75 $27,825
Estimating contingency 0 15%$4,174
Overhead & profit 0 30%$9,600
Design fees 0 10%$4,160
Project management 0 8%$3,661
Energy Costs
Fuel Oil 1 - 25 -403 gal $4.91 ($56,004)
Net Present Worth ($6,600)
Hoonah Pool and Gym 31 FINAL Energy Audit (November 2011)
Appendix B
Energy and Utility Data
Hoonah Pool and Gym 32 FINAL Energy Audit (November 2011)
Alaska Energy Engineering LLC Billing Data
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Hoonah Pool and Gym
ELECTRIC RATE
Inside Passage Electric Cooperative Large Commercial Rate
Electricity ($ / kWh )$0.5522
Cost of Power Adjustment ($ / kWh)$0.0000
Demand ( $ / kW )$12.29
Customer Charge ( $ / mo )$50.00
Sales Tax ( % )0.0%
ELECTRICAL CONSUMPTION AND DEMAND
kWh kW kWh kW kWh kW kWh kW
Jan 12,440 42 10,160 37 9,400 24 8,480 30 10,120
Feb 9,600 38 12,720 42 5,640 28 7,960 32 8,980
Mar 12,520 38 11,320 41 5,440 28 6,200 31 8,870
Apr 12,640 38 13,200 42 5,640 22 5,360 28 9,210
May 11,200 39 10,000 41 3,880 20 2,040 25 6,780
Jun 8,120 42 3,520 25 1,160 14 800 15 3,400
Jul 18,080 39 3,000 25 920 13 760 14 5,690
Aug 7,840 36 400 27 3,000 27 1,381 13 3,155
Sep 10,800 41 7,200 27 1,360 14 6,640 26 6,500
Oct 12,600 43 9,640 27 3,040 28 6,760 32 8,010
Nov 10,240 38 10,440 31 4,320 17 6,480 35 7,870
Dec 12,000 41 11,800 34 4,640 26 6,920 32 8,840
Total 138,080 103,400 48,440 59,781 87,425
Average 11,507 40 8,617 33 4,037 22 4,982 26 7,285
Load Factor 40%36%25%26%30
ELECTRIC BILLING DETAILS
Month Energy Demand Cust & Tax Total Energy Demand Cust & Tax Total % Change
Jan $5,191 $292 $50 $5,532 $4,683 $371 $50 $5,104 -7.7%
Feb $3,114 $345 $50 $3,509 $4,396 $399 $50 $4,845 38.1%
Mar $3,004 $346 $50 $3,400 $3,424 $376 $50 $3,849 13.2%
Apr $3,114 $274 $50 $3,438 $2,960 $338 $50 $3,348 -2.6%
May $2,143 $245 $50 $2,437 $1,126 $303 $50 $1,480 -39.3%
Jun $641 $172 $50 $863 $442 $189 $50 $681 -21.1%
Jul $508 $162 $50 $720 $420 $172 $50 $641 -11.0%
Aug $1,657 $334 $50 $2,040 $763 $157 $50 $970 -52.5%
Sep $751 $172 $50 $973 $3,667 $324 $50 $4,041 315.5%
Oct $1,679 $338 $50 $2,067 $3,733 $391 $50 $4,174 101.9%
Nov $2,386 $205 $50 $2,640 $3,578 $432 $50 $4,060 53.8%
Dec $2,562 $319 $50 $2,931 $3,821 $389 $50 $4,260 45.3%
Total $ 26,749 $ 3,202 $ 600 $ 30,551 $ 33,011 $ 3,841 $ 600 $ 37,452 22.6%
Average $ 2,229 $ 267 $ 50 $ 2,546 $ 2,751 $ 320 $ 50 $ 3,121 22.6%
Cost ($/kWh)$0.631 88% 10% 2% $0.626 -0.7%
Electrical costs are based on the current electric rates.
2009 2010
2010Month200720082009 Average
Hoonah Pool and Gym 33 FINAL 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
Hoonah Pool and Gym
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
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
5
10
15
20
25
30
35
40
45
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
Hoonah Pool and Gym 34 FINAL 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
Hoonah Pool and Gym 2010
$ 0
$ 1,000
$ 2,000
$ 3,000
$ 4,000
$ 5,000
$ 6,000
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
5
10
15
20
25
30
35
40
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 Dec Electric Demand (kW)Electric Use (kWh)Month of the Year
Electric Use and Demand Comparison
2010
Electric Use
Electric Demand
Hoonah Pool and Gym 35 FINAL 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
Hoonah Pool and Gym
Year Fuel Oil Degree Days
2,007 17,961 9,282
2,008 15,547 9,093
2,009 9,036 9,284
2,010 9,599 9,013
5,000
6,000
7,000
8,000
9,000
10,000
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
2007 2008 2009 2010 Degree DaysGallons of Fuel OilYear
Annual Fuel Oil Use
Fuel Oil
Degree Days
Hoonah Pool and Gym 36 FINAL 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
Hoonah Pool and Gym
Year Water*
2008 50,000
2009 48,500
2010 51,000
2011 343,000
* Water use is based upon best available data.
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
2008 2009 2010 2011Gallons of WaterYear
Annual Water Use
Hoonah Pool and Gym 37 FINAL 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 $4.63 $47.76 27,725 $4.14 75
Electricity $0.63 $193.28
Source Cost
Electricity 87,000 kWh $54,500 300 14%
Fuel Oil 13,000 Gallons $60,200 1,770 86%
Totals $114,700 2,070 100%
Energy, MMBtu
Annual Energy Consumption and Cost
Consumption
Hoonah Pool and Gym 38 FINAL Energy Audit (November 2011)
Appendix C
Equipment Data
Hoonah Pool and Gym 39 FINAL Energy Audit (November 2011)
MotorLocation Function Make Model Capacity HP / Volts / RPM / Effic NotesAHU 1 Fan Room Locker/LobbyTrane TBOB08AGOD3CLL033 HP/ 208 V/ 1740 RPM/ 87.5%Fan Room Exhaust FanTrane CBDP05BOSDCL03J3 HP/ 208 V/ 1740 RPM/ 87.5%AHU 2 Fan Room Pool AreaTrane TVEB105G0ESJLL035 HP/ 208 V/ 1750 RPM/ 87.5%Fan Room Relief Air FanTrane CBDB12BOSDCR13K5 HP/ 208 V/ 1745 RPM/ 81%AHU 3 Fan Room GymLa Salle HHV-227.5 HP/ 208 V/ 1760 RPM/ 91%RF 3 Fan Room Return FanLa Salle FS-223 HP/ 203 V/ 1760 RPM/ 89.5%AHU 4 Fan Room Weight Room/ Classroom La Salle HHV-031 HP/ 208 V/ 1740 RPM/ 82.5%RF 4 Fan Room Return FanLa Salle FS-031 HP/ 208 V/ 1725 RPM/ 74% AHU 5 Fan Room Pool Plenum Trane U85E506011 HP/ 208 V/ 1735 RPM/ 78.5%SF 1 Fan Room Boiler Room System1/4 HP/ 208 V/ 1725 RPMEF 5 Fan Room Boiler Room Exhaust1/4 HP/ 208 V/ 1725 RPMB3 Boiler Room BoilerWeil Mclain H-486-8-W720 Mbtuhi/low fireB4 Boiler Room BoilerWeil Mclain H-406-8-W720 Mbtuhi/low fireHV2 Boiler Room Hot Water HeaterPvi9.0-250-A-0250 gallonoil fired direct hot water heaterFire Pump Room Fire PumpPetterson FP-C816615 HP/ 208 V/ 1750 RPM/ 91%PP Pool Mechanical Pool Circulation Pump Aurora 341ABF312 gpm @ 60' 7.5 HP/ 208 V/ 1775 RPM/ 86.5%Boiler Room Hot Water Circulation Pump TACOHot Water Circulation Pump TACO 007-BF51/25 HP/ 115 V/ 3250 RPMCP 1 Boiler Room Boiler Circulation Pump B&G 2.5x72 HP/ 208 V/ 1725 RPM/ 78.5%CP 2 Boiler Room Boiler Circulation Pump B&G 2.5x72 HP/ 208 V/ 1725 RPM/ 78.5%CP 3 Boiler Room Pool Redirect Floor Heater TACO1/6 HP/ 120 V/ 3250 RPMCP 4 Boiler Room Pool Redirect Floor Heater TACO1/6 HP/ 120 V/ 3250 RPMUnit IDHoonah Gym and Pool - Major Equipment InventoryHoonah Pool and Gym 40 FINAL 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
Hoonah Pool and Gym 41 FINAL Energy Audit (November 2011)