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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Performance Tested HVAC Presentation to the RTF

January 5, 2010

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

2009 RTU Service PilotBPA’s Performance Tested HVAC

Climate Zone

Program Delivery

Contractor

HVACService

Company

Used FDSI Service

Assistant?

# Metered

Spokane PECI DRS Mechanical Yes 28

Puget Sound NEEC

MacDonald Miller Yes 120

Tri-Cities NoneApollo,

Campbell Yes 30

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Performance Tested HVAC ToolsPerformance Tested HVAC Tools

TrueFlow plate Service assistant

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Puget Sound TeamPuget Sound Team

NBI

NEEA

NEEC

RTF / RTUG

SCL

SnoPUD

Puget Sound Team BPA

Cadmus

Ecotope

EMP2

FDSI

MacDonald Miller

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

2009 RTU Service PilotPerformance Tested HVAC Thermostat measures

– Replacement

– Setpoint and schedule changes

Economizer measures

– Economizer commissioning

Setpoint changes

Fixing dampers

Replacing or repairing broken parts

– Minimum and maximum ventilation adjustment

Refrigeration cycle measures

– Condenser and evaporator coil cleaning

– Refrigerant charge adjustment

– System airflow adjustment

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Premium Service PackagesPremium Service Packages

Each RTU in the Puget Sound and Tri-Cities areas received a package of measures; basic diagnostic package (A):

Other packages:– B (basic diagnostics plus fix damper)– C (basic diagnostics plus new thermostat)– D (basic diagnostics plus new controller)

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Pilot Evaluation ElementsPilot Evaluation Elements

Pilot evaluation approach:

– Measure cooling and fan energy use at individual RTU level

– Larger sample size

– Two week pre/post metering with annualization

– Energy signature (kWh and OA temperature) and TMY3 weather data to annualize cooling and fan energy savings

– Compare metered savings to estimated savings

Report results and lessons learned to improve estimation, measurement, and realization of energy savings

Recommend improvements to direct BPA’s 2010 Performance Tested HVAC program

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

On-Site Data CollectionOn-Site Data Collection 161 RTUs metered Minimum two weeks baseline and post-servicing One-minute data Site characteristics recorded On-site data collection– Basic metering package:

Total unit power Outside air temperature/RH

– Modified basic package: Supply air temperature Y-1 call for cooling

– Full package: Return air temperature Supply air temperature Mixed air temperature

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Sample DistributionSample Distribution Climate zone Servicing contractor Building type Servicing package RTU capacity RTU type Unit age

RTU Type # of RTUsAll Electric 11Electric Cooling, Gas Heat 116Heat Pump 34

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Metered SavingsMetered Savings 161 RTUs metered

102 RTUs in Puget Sound, Tri-Cities and Spokane areas with complete post-servicing data

Mean cooling and fan energy savings:

1,615 per RTU and 172 kWh/ton

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Metered SavingsMetered Savings Average savings by unit age

Average savings by RTU type

Average savings by existing servicing contract

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Thermostat Measures SavingsMeasures Savings Operating schedules

– Average savings for 30 RTUs: 3,307 kWh

– Average savings 7 tons and greater: 5,198 kWh

– 83% of the units realized savings

– Maximum savings: 15,408 kWh

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Fan Scheduling Adjustments

37 units ran 90-100% of the time before servicing

After servicing:

– 12 units showed reduced operating hours

– 10 units served areas that may have 24-7 occupancy

– 15 units did not change: missed opportunities

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

PT HVAC Savings EstimatesPT HVAC Savings Estimates Pilot-level savings

Estimated annual electric savings (kWh) for 145 RTUs

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Detailed FindingsDetailed Findings

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Conclusions and RecommendationsConclusions and Recommendations

Fan energy is a key factor in savings

Thermostat measures may generate greatest savings, although persistence may be an issue

Recommend additional research:

– Outside air temperature

– Fan winter operation (NLL)

– Heat pump winter operation

– Total unit power

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

3 to 7 tons3 to 7 tons

– 431 kWh metered mean

– 760 kWh estimated mean

Larger than 7 tons

– 3,239 kWh metered mean

– 2,053 kWh estimated mean

Summary of Mean Savings Values

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

• Use to identify additional RTU opportunities

• DOAS

• Economizer upgrades

• DCV & Premium Ventilation

• Early replacement

Performance Tested HVAC

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B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

Comments? Questions?