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

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 Pilot BPA’s Performance Tested HVAC Climate Zone Program Delivery Contractor HVAC Service Company Used FDSI Service Assistant? # Metered SpokanePECIDRS Mechanical Yes28 Puget SoundNEEC MacDonald MillerYes120 Tri-CitiesNone Apollo, Campbell Yes30

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 Tools TrueFlow plate Service assistant

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 Team  NBI  NEEA  NEEC  RTF / RTUG  SCL  SnoPUD Puget Sound Team  BPA  Cadmus  Ecotope  EMP2  FDSI  MacDonald Miller

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 Pilot Performance 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

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 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)

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 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

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 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

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 Distribution  Climate zone  Servicing contractor  Building type  Servicing package  RTU capacity  RTU type  Unit age RTU Type# of RTUs All Electric11 Electric Cooling, Gas Heat116 Heat Pump34

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 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

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 Savings  Average savings by unit age  Average savings by RTU type  Average savings by existing servicing contract

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 Measures Savings Thermostat Measures 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

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 % 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

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 Estimates  Pilot-level savings  Estimated annual electric savings (kWh) for 145 RTUs

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 Findings

Slide 16 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 Recommendations Conclusions 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

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 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

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

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?