Performance Tested HVAC Presentation to the RTF January 5, 2010

1. Performance Tested HVAC Presentation to the RTFJanuary 5, 2010

2. 2009 RTU Service Pilot BPA’s Performance Tested HVAC

3. Performance Tested HVAC Tools TrueFlow plateService assistant

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

5. 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

6. 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)

7. 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

8. 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

9. Sample Distribution • Climate zone • Servicing contractor • Building type • Servicing package • RTU capacity • RTU type • Unit age

10. 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

11. Metered Savings • Average savings by unit age • Average savings by RTU type • Average savings by existing servicing contract

12. ThermostatMeasures 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

13. 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

14. PT HVAC Savings Estimates • Pilot-level savings • Estimated annual electric savings (kWh) for 145 RTUs

15. Detailed Findings

16. 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

17. 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

18. Use to identify additional RTU opportunities DOAS Economizer upgrades DCV & Premium Ventilation Early replacement Performance Tested HVAC

19. Comments? Questions?