HomeMy WebLinkAboutSEA-AEE-JNU Centennial Hall 2012-EE
Centennial Hall
City and Borough of Juneau
Funded by:
Final Report
February 2012
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 14
Section 5: Methodology 17
Appendix A: Energy and Life Cycle Cost Analysis 20
Appendix B: Energy and Utility Data 26
Appendix C: Equipment Data 32
Appendix D: Abbreviations 36
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
Centennial Hall 1 Energy Audit (February 2012)
Section 1
Executive Summary
An energy audit of Centennial Hall 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.
Centennial Hall is a 30,800 square foot building that contains commons, offices, meeting rooms, an
assembly hall, a commercial kitchen, storage, and mechanical support spaces.
Building Assessment
The following summarizes our assessment of the building.
Envelope
The building envelope of Centennial Hall appears to be providing good service and is well
maintained. The siding is well preserved and the finish work shows good attention to details.
However, the building however is not completely without envelope issues. These include the
following:
The most significant energy efficiency issue at Centennial Hall is the roof assembly which
utilizes an Inverted Roof Membrane Assembly (IRMA). This assembly typically has a bottom
waterproof layer such as EPDM, then a layer of foam insulation, a fabric cloth, and final
protective covering of gravel or concrete pavers. The insulation consists of two 3” layers which
would normally produce an insulation value of R-30.
It has been determined that the IRMA is a flawed system that is particularly ineffective and
inefficient in Southeast Alaska. This is because the IRMA allows water to flow between the
layers of insulation to the waterproof membrane below before it flows to the roof drains. This
presents a two-fold problem. First, the foam eventually becomes waterlogged and loses some of
its insulating properties. Secondly, any outdoor temperature water moving through the foam
layers against the warm roof surface below will remove heat as it travels to the roof drain. In a
climate such as Juneau’s, imagine the number of days/year that the roof and underside of the
ceiling is being cooled to the temperature of the rain water. That number is simply the number of
rainy days/year. The end result is that the overall roof insulation package value is decreased by
approximately 50%. That means Centennial hall has a 30,800 sq ft roof performing at R-15 when
R-46 is an optimal level for this climate. Based on a life cycle cost analysis, replacement with a
tapered roof system buildup to optimum insulation levels is not recommended. See Section 3,
Energy Efficiency Measure-12.
Several steel door frames and the south facing office window steel trim have rust damage.
Exterior doors are not thermally broken. Future exterior door replacement selection should
include this feature. Weather stripping is in poor condition on many of the doors and should be
replaced.
The east overhead door in the loading dock has been damaged at the top, resulting in a 6” air gap.
The door should be replaced with a high efficiency insulated unit.
Centennial Hall 2 Energy Audit (February 2012)
Heating, Ventilating, and Air-conditioning Systems
The building is heated by four air-source heat pump units, one heating and ventilator unit, nine fan
terminal units, and five unit heaters. These are all-electric systems that use air to heat and cool the
building. Some of the energy efficiency issues/opportunities with the heating and ventilation systems
identified by the audit team include:
The original motor sizing for R/E-1 was 10 hp. It now has a 5 HP motor installed. Has the
exhaust rate for this fan been reduced below original design levels? Or, was a different
replacement motor used?
Heat Pump HP-2 was not supplying sufficient heat to the lobby. While checking the controls, the
heat pump was supplying heat, the electric coils were off, yet the lobby was not up to setpoint.
The electric coil was manually enabled and the room temperature increased to setpoint. The
system then appeared to control properly.
A significant amount of heat is generated by the 300 kVA transformer and the lighting control
units operating in the 2nd floor electrical room. This heat is removed with an exhaust fan to the
outside of the building. This heat could be utilized within the building envelope if a heat recovery
method is utilized.
All heat pump evaporator coils are in need of cleaning.
The air-source heat pump systems have redundant electric heating coils to supply heat if the heat
pump fails or enters a defrost cycle. While they are capable of operating during cold weather—at
greater efficiency than electric resistance heat—they are currently controlled to shut down the heat
pump when outside temperature is below 40°F. This decision to disable the heat pumps during the
heating season increases energy costs by $25,000 to $30,000 per year. The operating procedure for
disabling the heat pumps during the heating season should be reviewed.
The remainder of the 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.
Lighting
Interior lighting consists primarily of T12 fluorescent fixtures and metal halide lighting in the lobby,
offices, meeting rooms, and support areas. The assembly hall primarily utilizes 500-watt dimmable
quartz lighting that can be augmented by 400-watt metal halide pendant lighting. Exterior lighting
consists primarily of metal halide and high pressure sodium lighting. Because lighting operational
hours are tightly controlled by staff, operational costs for lighting with existing infrastructure are kept
to a minimum.
Much of the energy that is saved by newer, more efficient lighting fixtures is in the form of heat.
Because the additional heat produced by the T12 fluorescent fixtures is beneficial within the building
envelope, the current maintenance plan of replacing the T12 fixtures with more efficient T8 fixtures
only as the ballasts fail is a responsible approach to phasing in the newer and more efficient T8
fixtures. Maintenance staff is also replacing the interior metal halide and incandescent spot lighting
with more efficient compact fluorescent lamps in the same manner.
Centennial Hall 3 Energy Audit (February 2012)
Summary
The overall energy performance of Centennial Hall at 45 kBtu/sqft is well below the 66 kBtu/sqft
average of all the public Juneau buildings that Alaska Energy Engineering LLC has audited. The
lower-than-average energy consumption is attributed to the use of heat pumps in the building. If the
heat pumps are operated during the heating season, the building performance will likely be 30
kBtu/sqft.
It is the assessment of the energy audit team that the majority of the building’s energy efficiency
opportunities could be achieved with optimization of ventilation systems and individual space heat
recovery followed by a retro-commissioning of the ventilation equipment.
Centennial Hall 4 Energy Audit (February 2012)
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: Weather-strip Doors
EEM-2: Institute Demand Control
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: Reduce Entrance Temperature $100 $0 ($7,700) ($7,600)77.0
EEM-4: Replace Lavatory Aerators $400 $0 ($7,400) ($7,000)18.5
EEM-5: Optimize Ventilation Systems $97,000 $51,100 ($623,600) ($475,500)5.9
EEM-6: Turn Off Hot Water Heater $3,600 $4,100 ($23,600) ($15,900)5.4
EEM-7: Electrical Room Heat Recovery $8,900 $0 ($38,500) ($29,600)4.3
EEM-8: Remove Vending Machine Lamps $100 $0 ($400) ($300)4.0
Medium Priority
EEM-9: Replace Uninsulated Overhead Doors $12,800 $0 ($30,700) ($17,900)2.4
EEM-10: Upgrade Transformers $47,300 $0 ($50,000) ($2,700)1.1
Totals* $170,200 $55,200
($781,900) ($556,500)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.
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.
Centennial Hall 5 Energy Audit (February 2012)
Section 2
Introduction
This report presents the findings of an energy audit Centennial Hall 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
Centennial Hall is a 30,800 square foot building that contains commons, offices, meeting rooms, an
assembly hall, a commercial kitchen, storage, and mechanical support spaces. The building is
occupied in the following manner:
Hall & Meeting Rooms 6:00 am – 2:00 am (Variable weekly and daily schedules)
Kitchen Up to 5 days/week to meet food service needs
Building History
1983 – Original Construction
1996 – Building Automated Control Upgrades
2009 – Siding Repair/Replacement
Centennial Hall 6 Energy Audit (February 2012)
Energy Consumption
The building energy source is electricity for all loads. The following table shows annual energy use
and cost.
Annual Energy Consumption and Cost
Source Consumption Cost Energy, MMBtu
Electricity 407,378 kWh $44,500 1,400 100%
Electricity
This chart shows electrical energy use
from 2007 to 2010, during which time the
electrical consumption has been steady.
The effective cost—energy costs plus
demand charges—is 11.3¢ per kWh.
Cost of Heat Comparison
This chart shows a comparison of the
current cost of fuel oil heat, electric
resistance heat, and heat pump heat. The
comparison is based on a fuel oil
conversion efficiency of 70%, an electric
boiler conversion efficiency of 95%, and
a heat pump conversion efficiency of
300%. Heat pump heat is considerably
less expensive than fuel oil heat.
Centennial Hall 7 Energy Audit (February 2012)
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: Many of the exterior doors do not seal well and are missing weather stripping in places,
and one of the north main entry doors will not close completely. Energy will be saved if
all doors are properly weather-stripped to reduce infiltration and adjusted to ensure they
are firmly closed.
Scope: Replace weather stripping on exterior doors and adjust as necessary to ensure complete
closure.
EEM-2: Institute Demand Control
Purpose: The DDC system has a demand control feature that allows for prioritizing electric loads.
This feature has been disabled. Energy costs will be reduced if the demand control
feature is placed back in service and careful consideration is given to setting the load
priority of the system.
Scope: Institute a demand control strategy for the electric heating loads that sheds loads during
periods of high demand and cycles them so they do not all peak at once.
Centennial Hall 8 Energy Audit (February 2012)
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: Reduce Entrance Temperature
Purpose: The two arctic entryways to the building use cabinet fan heaters to maintain space
temperature. The setpoint was set at-or-above 65°F. Energy will be saved if the entrance
temperature setpoint is lowered to 55°F in both arctic entryways.
Scope: Install programmable thermostats and lower the entryway thermostat setpoints to 55°F in
both arctic entryways.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($390) ($390) $100 $0 ($7,700) ($7,600) 77.0
EEM-4: Replace Lavatory Aerators
Purpose: Energy and water will be saved by replacing the lavatory aerators with low-flow models.
Scope: Replace lavatory aerators with water-conserving fixtures.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($370) ($370) $400 $0 ($7,400) ($7,000) 18.5
Centennial Hall 9 Energy Audit (February 2012)
EEM-5: Optimize Ventilation Systems
Purpose: The building utilizes electric heat pump heating and ventilation system units to provide
conditioned air to interior space. A review of the control sequences and equipment
operation revealed that there are deficiencies with the existing systems and opportunities
to improve their energy performance.
Scope: Perform the following to ensure efficient operations of the systems:
- The heat pumps have lockout controls that turn off the heat pump during cold weather.
The manufacturer’s data indicates that the units are capable of operating at colder
temperatures. Enable the heat pumps to operate during cold weather to improve
heating efficiency.
- Operate HP-1 in Unoccupied Mode: The former Forest Service space is currently
unoccupied, yet HP-1 is scheduled to operate in occupied mode. Placing the unit in
unoccupied mode will reduce ventilation and fan energy.
- Recalibrate Fan Terminal Units: Several of the FTUs are not controlling properly. The
main issue is lack of sequential control of heating and cooling modes with minimum
outside air controlled from CO2 sensors.
- Clean Heat Pump Evaporator Coils.
- Optimize Heat Pump HP-1 (Former Forest Service Space).
- Optimize HP-1, HP-2, HP-3, and HVAC-1. Modify the controls as follows:
a. Change controls to sequential control of dampers and heat to maintain room
temperature or supply air temperature.
b. Provide CO2 sensor override of dampers to maintain 800 ppm.
c. Modulate the exhaust air damper or relief fan (as applicable) to maintain a
neutral building pressure.
d. Reduce heating setpoints to 70°F during occupied periods and 62°F during
unoccupied periods.
e. Evaluate lockout temperature setpoints and set to maximize heat pump operating
hours through the heating season, while protecting the equipment.
f. Increase HP-2 minimum outside air setting to provide sufficient make-up air for
the EF-1 toilet exhaust of 3,055 cfm.
g. Replace the HVAC-1 outlet damper with a VFD.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$3,000 ($31,720) ($28,720) $97,000 $51,100 ($623,600) ($475,500) 5.9
Centennial Hall 10 Energy Audit (February 2012)
EEM-6: Turn Off Hot Water Heater
Purpose: Centennial Hall has a 300-gallon and a 120-gallon electric hot water heater. The capacity
of both water heaters exceeds the demands of the building. Energy will be saved if the
120-gallon electric hot water heater is turned off and a thermostatic mixing valve
installed to supply 120°F water to the building fixtures.
Scope: Connect the building fixtures to the 300-gallon hot water heater, install a tempering valve
to reduce the supply temperature to 120°F and turn off the 120-gallon electric hot water
heater.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$240 ($1,200) ($960) $3,600 $4,100 ($23,600) ($15,900) 5.4
EEM-7: Electrical Room Heat Recovery
Purpose: A significant amount of heat is generated by the 300 kVA transformer and the lighting
controls operating in the 2nd floor electrical room. This heat is removed with an exhaust
fan to the outside of the building. Energy will be saved if an exhaust fan and ductwork is
installed to distribute the heat to the assembly hall.
Scope: Install a fan supply ductwork, and return ductwork to distribute the heat to the assembly
hall.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($1,960) ($1,960) $8,900 $0 ($38,500) ($29,600) 4.3
EEM-8: Remove Vending Machine Lamps
Purpose: Lamps for soft drink coolers run continuously and are not necessary. Energy will be
saved if these lamps are removed.
Scope: Remove lamps from soft drink coolers.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($20) ($20) $100 $0 ($400) ($300) 4.0
Centennial Hall 11 Energy Audit (February 2012)
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-9: Replace Uninsulated Overhead Doors
Purpose: Two overhead doors at the north end of the building are uninsulated and have very poor
weather stripping. One of the doors is badly damaged at the top, resulting in a 6” air gap
between the door and the weather stripping in the center of the door. Energy will be
saved by replacing these overhead doors with high efficiency insulated units.
Scope: Replace overhead doors with high efficiency insulated units and replace weather
stripping.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($1,560) ($1,560) $12,800 $0 ($30,700) ($17,900) 2.4
EEM-10: Upgrade Transformers
Purpose: Existing 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 1-2001
compliant models:
300 kVA transformer in the electrical room.
45 kVA transformer in the storage room.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($2,540) ($2,540) $47,300 $0 ($50,000) ($2,700) 1.1
Centennial Hall 12 Energy Audit (February 2012)
LOW PRIORITY
Low priority EEMs do not offer a life cycle energy savings and are not recommended.
EEM-11: Replace Single Pane Door Glazing
Purpose: The exterior doors have single pane glazing. Energy will be saved if the glazing is
replaced with high efficiency 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 ($470) ($470) $24,800 $0 ($9,200) $15,600 0.4
EEM-12: Replace Roof Insulation
Purpose: The roof is an IRMA roof system with an assembly insulation value of only R-15. Energy
will be saved if the roof is replaced with a conventional roofing system.
Scope: Replace IRMA roof system with R-46 tapered roof system.
Annual Costs Life Cycle Costs
Operating Energy Total Investment Operating Energy Total SIR
$0 ($6,850) ($6,850) $1,398,600 $0 ($134,600) $1,264,000 0.1
EEM-13: Replace Ballroom Lighting
Purpose: There are 111 dimmable 500-watt quartz lights in the ballroom. Energy will be saved if
they are replaced with dimmable LED fixtures that produce the same amount of light.
Scope: Replace the dimmable ballroom lighting with LED lighting. This EEM is not
recommended because of the high cost of replacing both the light fixtures and lighting
control panel.
Centennial Hall 13 Energy Audit (February 2012)
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 Wall 5/8” Gyp. bd, 2”x6” metal stud, R-19 batt, 5/8” plywood, siding R-12 R-26
Roof 2” concrete, EPDM, 6” foam insulation, filter fabric, wash rock R-15 R-46
Floor 4” slab on grade R-10 R-10
Foundation 8” concrete w/ 2” perimeter insulation board R-10 R-20
Windows Double pane aluminum frame R-1.5 R-5
Doors Steel doors w/ non-thermally broken frames R-1.5 R-5
Heating System
The building is heated by four heat pump units, one heating ventilator unit, nine fan terminal units,
and five unit heaters. These are all-electric systems that use ventilation air to heat and cool the
building.
Domestic Hot Water System
The direct hot water heater system consists of one 300-gallon AO Smith electric hot water heater that
serves the kitchen and one 120-gallon AO Smith electric hot water heater that serves the remaining
fixtures.
Automatic Control System
A DDC system was installed in 1996 to provide control functions for the operation of the heating and
ventilation systems. The system was provided with a load shedding capability so that loads can be
prioritized and sequenced on and off to reduce the peak electrical demand. Energy can be saved
through further optimization of fan system scheduling combined with a retro-commissioning of the
air handler systems.
Centennial Hall 14 Energy Audit (February 2012)
Ventilation Systems
Area
Fan
System Description
Vacant Space HP-1 2,930 cfm 1 hp heat pump unit consisting of an outside air damper,
heating and cooling coil, mixing box, filter section, and supply fan
Lobby HP-2 9,400 cfm 10 hp heat pump unit consisting of an outside air
damper, heating and cooling coil, mixing box, filter section, and
supply fan
Assembly Hall HP-3 20,000 cfm 15 hp heat pump unit consisting of an outside air
damper, heating and cooling coil, mixing box, filter section, and
supply fan
Meeting Rooms HVAC-
1
6,400 cfm 7 ½ hp heat pump unit consisting of an outside air
damper, heating and cooling coils, mixing box, filter section, and
supply fan
Back of House HV-1 5,170 cfm 5 hp constant volume air handling unit consisting of an
outside air damper, heating element, filter section, and supply fan
Assembly Hall R/E-1 18,000 cfm 5 hp constant volume fan supplying return air
Kitchen SF-1 1.5 hp constant volume make-up air supply fan
Lobby/Restrooms EF-1 3,055 cfm ½ hp constant volume exhaust fan
Electrical Room EF-2 2,340 cfm constant volume exhaust fan
Dishwasher Hood EF-3 500 cfm 1/6th hp constant volume exhaust fan
Kitchen Hood EF-4 3 hp constant volume exhaust fan
Meeting Room #2 FTU-1 300 cfm cooling, 200 cfm heating 120 watt fan terminal unit
Meeting Room #3 FTU-2 600 cfm cooling, 450 cfm heating 225 watt fan terminal unit
Meeting Room #1 FTU-3 1200 cfm cooling, 800 cfm heating 1/3 hp fan terminal unit
Meeting Room #4 FTU-4 1200 cfm cooling, 800 cfm heating 1/3 hp fan terminal unit
Foyer FTU-5 1200 cfm cooling, 800 cfm heating 1/3 hp fan terminal unit
Foyer FTU-6 1200 cfm cooling, 800 cfm heating 1/3 hp fan terminal unit
Foyer FTU-7 1200 cfm cooling, 800 cfm heating 1/3 hp fan terminal unit
Foyer FTU-8 1200 cfm cooling, 800 cfm heating 1/3 hp fan terminal unit
Foyer FTU-9 2900 cfm cooling, 2000 cfm heating 1/3 hp fan terminal unit
Centennial Hall 15 Energy Audit (February 2012)
Lighting
Interior lighting consists primarily of T12 fluorescent fixtures and metal halide lighting in the
commons, offices, meeting rooms, and support areas. The assembly hall primarily utilizes 500-watt
dimmable quartz lighting that can be augmented by 400-watt metal halide pendant lighting. Exterior
lighting consists primarily of metal halide and high pressure sodium lighting. Because lighting
operational hours are controlled by staff, operational costs for lighting with existing infrastructure are
kept to a minimum.
Much of the energy that is saved by newer, more efficient lighting fixtures is in the form of heat.
Because the additional heat produced by the T12 fluorescent fixtures is beneficial within the building
envelope in the climate of Juneau, the current maintenance plan of replacing the T12 fixtures with
more efficient T8 fixtures only as the ballasts fail is a responsible approach to phasing in the newer
and more efficient T8 fixtures. Maintenance staff is also replacing the interior metal halide and
incandescent spot lighting with more efficient compact fluorescent bulbs in the same manner.
Electric Equipment
Commercial equipment for food preparation is located in the kitchen preparation area.
Centennial Hall 16 Energy Audit (February 2012)
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.
Centennial Hall 17 Energy Audit (February 2012)
Maintenance Costs
Maintenance costs are based on in-house or contract labor using historical maintenance efforts and
industry standards. Maintenance costs over the 25-year life of each EEM are included in the life cycle
cost calculation spreadsheets and represent the level of effort to maintain the systems.
Energy Analysis
The energy performance of an EEM is evaluated within the operating parameters of the building. A
comprehensive energy audit would rely on a computer model of the building to integrate building
energy systems and evaluate the energy savings of each EEM. This investment grade audit does not
utilize a computer model, so energy savings are calculated with factors that account for the dynamic
operation of the building. Energy savings and costs are estimated for the 25-year life of the EEM
using appropriate factors for energy inflation.
Prioritization
Each EEM is prioritized based on the life cycle savings to investment ratio (SIR) using the following
formula:
Prioritization Factor = Life Cycle Savings / Capital Costs
This approach factor puts significant weight on the capital cost of an EEM, making lower cost EEMs
more favorable.
Economic Factors
The following economic factors are significant to the findings.
Nominal Interest Rate: This is the nominal rate of return on an investment without regard to inflation.
The analysis uses a rate of 5%.
Inflation Rate: This is the average inflationary change in prices over time. The analysis uses an
inflation rate of 2%.
Economic Period: The analysis is based on a 25-year economic period with construction beginning in
2010.
Fuel Oil
Fuel oil currently costs $3.52 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.
Centennial Hall 18 Energy Audit (February 2012)
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:
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 $0.094/kWh
General Inflation Rate 2% Electricity Inflation 3%
Centennial Hall 19 Energy Audit (February 2012)
Appendix A
Energy and Life Cycle Cost Analysis
Centennial Hall 20 Energy Audit (February 2012)
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
Centennial Hall
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 $0.061 $12.14 3% $0.063 $12.50
w/o Demand Charges $0.109 -3% $0.112 -
EEM-3: Reduce Entrance Temperature
Energy Analysis
Component Area R-value ΔT Hours MBH kBtu COP kWh
Wall 640 12.0 -10 8,760 -0.5 -4,672 100% -1,369
Roof 160 15.0 -10 8,760 -0.1 -934 100%-274
Windows 100 1.5 -10 8,760 -0.7 -5,840 100% -1,712
Door 168 1.5 -10 8,760 -1.1 -9,811 100% -2,875
-2.4 -21,258 -6,230
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Turn down thermostat 0 2 LS $50 $100
Energy Costs
Electric Energy 1 - 25 -6,230 kWh $0.063 ($7,695)
Net Present Worth ($7,600)
EEM-4: Replace Lavatory Aerators
Energy Analysis
Fixture Existing Proposed Uses/day Days Water,Gals % HW kBTU kWh
Lavatories 0.3 0.2 200 365 -13,140 80% -7,014 -2,056
-13,140 -2,056
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace lavatory aerators 0 12 ea $35 $420
Energy Costs
Water 1 - 25 -13 kgals $10.960 ($2,831)
Electric Energy (Effective Cost)1 - 25 -2,056 kWh $0.112 ($4,537)
Net Present Worth ($6,900)
Gallons per Use
Centennial Hall 21 Energy Audit (February 2012)
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
Centennial Hall
EEM-5: Optimize Ventilation Systems
Energy Analysis
Fan Case CFM ΔP η, fan BHP η, motor kW Hours kWh
HP-1 Existing -2,930 1.25 55%-1 89%-1 3,650 -3,205
HVAC-1 Existing -6,400 3.20 55%-6 91%-5 3,650 -17,530
Optimized 5,000 2.50 55%4 91%3 3,650 10,699
-3 -10,036
Ventilation SA CFM MAT T,room MBH Hours kBtu COP kWh
HP-1 Existing -2,930 65 70 -16 3,650 -57,750 225% -7,523
HVAC-1 Existing -6,400 62 70 -55 3,650 -201,830 225% -26,290
Optimized 6,400 65 70 35 3,650 126,144 68%1,339
HP-2 Existing -9,400 62 70 -81 3,650 -296,438 68%-3,148
Optimized 9,400 60 70 102 3,650 370,548 68%3,934
-59,327 -31,686
Heat Pump HP-3
Building Heating Load, kBtu 2,989,653
HP-3 Percentage 35%
HP-3 Load, kBtu 1,046,379
Below 40F 80%
HP-3 Lockout, kBtu 837,103
COP 220%
kWh Savings -456,602
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install VFD 0 1 ea $7,500 $7,500
Control Modifications 0 $0
Reschedule HP-1 0 1 LS $100 $100
Recalibrate FTUs 0 9 ea $1,500 $13,500
Install occupancy sensors 0 9 ea $1,500 $13,500
HP-1, HP-2, HP-3, HVAC-1 0 4 ea $5,000 $20,000
Estimating contingency 0 15%$8,190
Overhead & profit 0 30% $18,837
Design fees 0 10%$8,163
Project management 0 8%$7,183
Annual Costs
Increase HP-3 maintenance 1 - 25 1 LS $3,000.00 $51,081
Energy Costs
Electric Energy 1 - 25 -498,324 kWh $0.063 ($615,474)
Electric Demand 1 - 25 -33 kW $12.50 ($8,110)
Net Present Worth ($475,500)
Centennial Hall 22 Energy Audit (February 2012)
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
Centennial Hall
EEM-6: Turn Off Hot Water Heater
Energy Analysis
kW Months kW savings
-12.0 8 -96
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Install hot water tempering valve 0 1 ea $3,500 $3,500
Turn off hot water heater 0 2 ea $60 $120
Annual Costs
Temperating valve maintenance 1 - 25 4 ea $60.00 $4,086
Energy Costs
Electric Demand 1 - 25 -96 kW $12.50 ($23,597)
Net Present Worth ($15,900)
EEM-7: Electrical Room Heat Recovery
Energy Analysis
Electricity
MBH kBtu COP kWh
-20 -179,335 150% -35,040
Fan Energy
MBH ΔT CFM ΔP η, fan # Fans Hours kW kWh
20 10 1,896 1.00 35%1 8,760 0.6 5,566
-2,340 0.25 35%1 8,760 -0.2 -1,718
3,848
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Inline fan 0 1 LS $2,000 $2,000
Supply and return ductwork 0 1 LS $2,000 $2,000
Electrical 0 1 ea $1,000 $1,000
Estimating contingency 0 15%$750
Overhead & profit 0 30% $1,725.00
Design fees 0 10%$748
Project management 0 8%$658
Energy Costs
Electric Energy 1 - 25 -31,192 kWh $0.063 ($38,525)
Net Present Worth ($29,600)
EEM-8: Remove Vending Machine Lamps
Energy Analysis
# Fixtures Lamp Lamp, watts Fixture Watts Hours, exist Hours, new Savings, kWh
4 T8 16 18 -8,760 4,380 -322
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Remove lamps 0 1 LS $100 $100
Energy Costs
Electric Energy 1 - 25 -322 kWh $0.063 ($398)
Net Present Worth ($300)
Centennial Hall 23 Energy Audit (February 2012)
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
Centennial Hall
EEM-9: Replace Uninsulated Overhead Doors
Energy Analysis
Component Area R,exist R,new ΔT MBH kBtu COP kWh
Overhead Door 257 0.50 5 15 -6.9 -60,667 100% -17,781
Infiltration
CFM ΔT MBH kBtu COP kWh
-100 25 -2.8 -24,090 100% -7,060
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace overhead door 0 257 sqft $50 $12,825
Energy Costs
Electric Energy 1 - 25 -24,841 kWh $0.063 ($30,681)
Net Present Worth ($17,900)
EEM-10: Upgrade Transformers
Energy Analysis
Number kVA ηold ηnew KW kWh
1 45 97.2% 98.6% -0.6 -5,519
1 300 98.0% 99.0% -3.0 -26,280
-3.6 -31,799
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace transformer, kVA 45 0 1 LS $6,500 $6,500
Replace transformer, kVA 300 0 1 LS $22,800 $22,800
Estimating contingency 0 15%$4,395
Overhead & profit 0 30% $10,109
Project management 0 8%$3,504
Energy Costs
Electric Energy 1 - 25 -31,799 kWh $0.063 ($39,274)
Electric Demand 1 - 25 -44 kW $12.50 ($10,707)
Net Present Worth ($2,700)
EEM-11: Replace Single Pane Door Glazing
Energy Analysis
Component Area R,exist R,new ΔT MBH kBtu COP kWh
Door 186 0.60 2.0 20 -4.3 -38,018 150% -7,428
-4.3 -38,018 -7,428
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace door glazing unit 0 186 sqft $75 $13,950
Estimating contingency 0 15%$2,093
Overhead & profit 0 30%$4,813
Design fees 0 10%$2,086
Project management 0 8%$1,835
Energy Costs
Electric Energy 1 - 25 -7,428 kWh $0.063 ($9,175)
Net Present Worth $15,600
Centennial Hall 24 Energy Audit (February 2012)
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
Centennial Hall
EEM-12: Replace Roof Insulation
Energy Analysis
Component Area R,exist R,new ΔT MBH kBtu COP kWh
Roof 31,500 15 46 30 -42.5 -371,919 100% -109,003
Life Cycle Cost Analysis Year Qty Unit Base Cost Year 0 Cost
Construction Costs
Replace IRMA roof with a roof insulation 0 31,500 sqft $25 $787,500
Estimating contingency 0 15% $118,125
Overhead & profit 0 30% $271,688
Design fees 0 10% $117,731
Project management 0 8% $103,604
Energy Costs
Electric Energy 1 - 25 -109,003 kWh $0.063 ($134,629)
Net Present Worth $1,264,000
Centennial Hall 25 Energy Audit (February 2012)
Appendix B
Energy and Utility Data
Centennial Hall 26 Energy Audit (February 2012)
Alaska Energy Engineering LLC Billing Data
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Centennial Hall
ELECTRIC RATE
Electricity ($ / 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 115,600 373 126,400 403 150,800 446 136,300 438 132,275
Feb 124,700 410 148,400 441 145,800 450 110,600 399 132,375
Mar 146,100 482 123,100 426 124,900 422 100,900 405 123,750
Apr 112,200 391 107,000 405 120,900 476 108,000 418 112,025
May 85,500 409 86,900 403 98,500 449 89,800 318 90,175
Jun 80,400 332 59,400 309 69,400 310 59,300 349 67,125
Jul 54,500 277 48,700 278 52,600 253 54,700 250 52,625
Aug 56,600 265 49,800 253 52,000 207 54,700 222 53,275
Sep 56,000 213 56,600 237 51,200 208 52,500 295 54,075
Oct 64,600 351 64,900 253 67,700 304 66,900 336 66,025
Nov 88,000 321 100,900 311 94,300 318 84,800 316 92,000
Dec 118,000 455 107,500 359 114,100 394 122,500 461 115,525
Total 1,102,200 1,079,600 1,142,200 1,041,000 1,091,250
Average 91,850 357 89,967 340 95,183 353 86,750 351 90,938
Load Factor 35.3% 36.3% 36.9% 33.9% 350
ELECTRIC BILLING DETAILS
Month Energy Demand Cust & Tax Total Energy Demand Cust & Tax Total % Change
Jan 9,214 6,378 99 15,691 8,328 6,263 99 14,691 -6.4%
Feb 8,908 6,435 99 15,443 6,758 5,706 99 12,563 -18.6%
Mar 7,631 6,035 99 13,765 6,165 5,792 99 12,056 -12.4%
Apr 7,387 6,807 99 14,293 6,599 5,977 99 12,675 -11.3%
May 6,018 6,421 99 12,538 5,487 4,547 99 10,133 -19.2%
Jun 4,240 2,824 99 7,164 3,623 3,179 99 6,902 -3.7%
Jul 3,214 2,305 99 5,618 3,342 2,278 99 5,719 1.8%
Aug 3,177 1,886 99 5,162 3,342 2,022 99 5,464 5.8%
Sep 3,128 1,895 99 5,122 3,208 2,687 99 5,994 17.0%
Oct 4,136 2,769 99 7,005 4,088 3,061 99 7,248 3.5%
Nov 5,762 4,547 99 10,408 5,181 4,519 99 9,799 -5.9%
Dec 6,972 5,634 99 12,705 7,485 6,592 99 14,176 11.6%
Total $ 69,788 $ 53,936 $ 1,191 $ 124,915 $ 63,605 $ 52,624 $ 1,191 $ 117,420 -6.0%
Average $ 5,816 $ 4,495 $ 99 $ 10,410 $ 5,300 $ 4,385 $ 99 $ 9,785 -6.0%
Cost ($/kWh)$0.109 54% 45% 1% $0.113 3.1%
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
Centennial Hall 27 Energy Audit (February 2012)
Alaska Energy Engineering LLC Annual Electric Consumption
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Centennial Hall
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
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
100
200
300
400
500
600
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
Centennial Hall 28 Energy Audit (February 2012)
Alaska Energy Engineering LLC Electric Cost
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Centennial Hall 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
50
100
150
200
250
300
350
400
450
500
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
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
Centennial Hall 29 Energy Audit (February 2012)
Alaska Energy Engineering LLC Annual Water Consumption
25200 Amalga Harbor Road Tel/Fax: 907-789-1226
Juneau, Alaska 99801 jim@alaskaenergy.us
Centennial Hall
Year Water
2007 360,000
2008 228,000
2009 372,000
2010 420,000
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
450,000
500,000
2007 2008 2009 2010Gallons of WaterYear
Annual Water Use
Centennial Hall 30 Energy Audit (February 2012)
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 30,800 $1.49 45
Electricity $0.113 $34.80
Heat Pump Heat $0.113 $11.02
Source Cost
Electricity 407,378 kWh $46,000 1,400
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 Electricity Heat Pump HeatCost $ / MMBtuCost of Heat Comparison
Centennial Hall 31 Energy Audit (February 2012)
Appendix C
Equipment Data
Centennial Hall 32 Energy Audit (February 2012)
MotorHP / Volts / RPM / EfficHP-1 Penthouse 2 Meeting Room Heat Pump Carrier50PQ012 600A2,930 CFM1 HP/ 480 VoltDirty Intake ScreenHeating 42.116 MBHHP-2 Penthouse 2 Lobby Heat Pump Carrier50PQ012 600A9400 CFM10 HP/ 480 Volt/ 1725 RPM/ 85.5%Dirty Intake ScreenHeating 187.194 MBHHP-3 Penthouse 1 Assembly Hall Heat Pump Carrier 39ER48 20,000 CFM 15 HP/ 480 Volt/ 1750 RPM/ 91%HP-3A1 Penthouse 1 Assembly Hall Heat Pump Carrier 38AQO34600 Heating 630.34 MBHHP-3A2 Penthouse 1 Assembly Hall Heat Pump Carrier 38AQO34600 Heating 630.34 MBHHV-1 Penthouse 1 Carrier 39ER10 5170 CFM 5 HP/ 480 Volt/1750 RPM/85.5% 15 KWHVAC-1 Penthouse 1 Meeting Room Carrier50 DF0246105H6400 CFM7.5 HP/ 480V/ 1750 RPM/ 85.5% Storage RoomHVAC-1 Return Fan Trane 21C-9-11 1/2 HP/480V/1745 RPM/ 78%HVAC-2 Roof MeetingCarrier 38CBO366001/16 HP/ 480VNot WorkingR/E-1Storage RoomAssembly Hall Trane Q40 18,000 CFMFTU-1Meeting Room 2Space Heating and Cooling Temp Master HFB Heating 200 CFM 120 Watt/ 277 VoltCooling 300 CFMFTU-2Meeting Room 3Space Heating and Cooling Temp Master HFB Heating 450 CFM 225 Watt/ 277 VoltCooling 600 CFMFTU-3Meeting Room 1Space Heating and Cooling Temp Master HFB Heating 800 CFM 1/3 HP/ 277 VoltCooling 1200 CFMFTU-4Meeting Room 4Space Heating and Cooling Temp Master HFB Heating 800 CFM 1/3 HP/ 277 VoltCooling 1200 CFMFTU-5 Vestibule Space Heating and Cooling Temp Master HFB Heating 800 CFM 1/3 HP/ 480 VoltCooling 1200 CFMFTU-6 Vestibule Space Heating and Cooling Temp Master HFB Heating 800 CFM 1/3 HP/ 480 VoltCooling 1200 CFMFTU-7 Vestibule Space Heating and Cooling Temp Master HFB Heating 800 CFM 1/3 HP/ 480 VoltCooling 1200 CFMFTU-8 Vestibule Space Heating and Cooling Temp Master HFB Heating 800 CFM 1/3 HP/ 480 VoltCooling 1200 CFMFTU-9 Lobby Space Heating and Cooling Temp Master HFB Heating 2000 CFM 1/3 HP/ 480 VoltCooling 2900 CFMCooling 273.274 TMBH Cooling 124.62 TMBH Cooling 645.4 TMBH Cooling 645.4 TMBH - Major Equipment InventoryCapacityNotesUnit IDLocation Function Make Model
Centennial Hall 33 Energy Audit (February 2012)
MotorHP / Volts / RPM / Effic - Major Equipment InventoryCapacityNotesUnit IDLocation Function Make ModelA-1 Kitchen Hot Water Heater AO Smith DSE-120-12 120 Gallon480 Volt/ 12 KW1 ElementA-2 Kitchen Hot Water Heater AO Smith DVE-300-75 300 Gallon480 Volt/ 75 KW5 ElementsH-1 Arctic Entry Space HeatingTrane D-34EO-08 800 CFM1/8 HP/ 480 Volt/ 15 KWH-2 Arctic Entry Space HeatingTrane D-34EO-08 800 CFM1/8 HP/ 480 Volt/ 15 KWH-3 Exterior Door Heat CurtainBerner Mark 2 36E 400 CFM1/3 HP/ 480 Volt/ 14.5 KWH-3B Exterior Door Heat CurtainBerner Mark 2 36E 400 CFM1/3 HP/ 480 Volt/ 14.5 KWH-3C Exterior Door Heat CurtainBerner Mark 2 36E 400 CFM1/3 HP/ 480 Volt/ 14.5 KWH-3D Exterior Door Heat CurtainBerner Mark 2 36E 400 CFM1/3 HP/ 480 Volt/ 14.5 KWH-3E Exterior Door Heat CurtainBerner Mark 2 36E 400 CFM1/3 HP/ 480 Volt/ 14.5 KWH-4 Lower Stairs Space HeatingChromalox MUH-05-7277 Volt/ 5 KWH-5 Penthouse Space HeatingChromalox MUH-05-7277 Volt/ 5 KWEF-1 Roof Lobby Exhaust Fan Penn LB-24 1/2 HP/ 115V 1/2 HP/ 115 VoltEF-2Electrical RoomExhaust FanPenn B1917BZW 2340 CFMEF-3 Kitchen Dishwasher Exhaust Hood500 CFM1/6 HP/ 115 VoltEF-4 Roof Kitchen HoodPennSF-1 Roof Kitchen Make Up1.5HP/480V/1725RPMT-1 Penthouse 2 TransformerSquare D 45T34 45 KVANon-TP RatedT-2Electrical RoomTransformerSquare D 300T 3H 300 KVANon-TP RatedT-3Storage RoomTransformerSquare D 300T 3H 300 KVANon-TP RatedLD1Electrical RoomLight DimmerStrand Century CD 80800 Amp / Three Phase/ 120/208VLD2Electrical RoomLight DimmerStrand Century CD 80800 Amp / Three Phase/ 120/208VCentennial Hall 34 Energy Audit (February 2012)
MotorHP / Volts / RPM / Effic - Major Equipment InventoryCapacityNotesUnit IDLocation Function Make ModelLD3Electrical RoomPlatform Light Dimmer Strand Century CD 80800 Amp / Three Phase/ 120/208VLD4Electrical RoomAndiane Light Dimmer Strand Century CD 80800 Amp / Three Phase/ 120/208VKitchen RefrigeratorBeverly115VKitchen Ice MakerManifawar S970Kitchen DishwasherStero SCT-44-CSA2.25 HP/ 480V/ 4.6 AmpsKitchen Walk in Refrigerator HeatcraftKitchen OvenLangQuantity 3Kitchen GrillLangQuantity 2Kitchen Warming OvenDuke E-102-EVQuantity 2Centennial Hall 35 Energy Audit (February 2012)
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
Centennial Hall 36 Energy Audit (February 2012)