Performance Tested HVAC Presentation to the RTF January 5, 2010
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Transcript of Performance Tested HVAC Presentation to the RTF January 5, 2010
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Slide 1
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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Slide 2
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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Slide 3
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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Slide 4
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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Slide 5
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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Slide 6
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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Slide 7
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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Slide 8
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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Slide 9
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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Slide 10
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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Slide 11
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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Slide 12
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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Slide 13
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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Slide 14
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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Slide 15
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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Slide 17
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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Slide 18
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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Slide 19
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?