1. PNW RoofTop Unit Working Group - RTUG – RTU Savings Research Project Phase 3 December 15, 2009

2. RTUG Agenda 12/15/09 9:30-9:45am- Presentation on expected RTU savings and potential from the NW Power and Conservation Council’s 6 th Power Plan - NW Energy efficiency Alliance Service Assistant Project Update 9:45-10:45Results: Bonneville RTU Savings Research >> 10:45-11:00Break 11:00-12:00pmDiscussion: Bonneville Results 12:00-12:15pmResults: Idaho Power RTU Savings Research >> 12:15-1:15pmLunch Break - WEB shows agenda; telcomm off line 1:15-1:30pmResults: Energy Trust of Oregon RTU Pilot Savings 1:30-1:45pmResults: Puget Sound Energy RTU Savings Evaluation 1:45-2:00pmResults: AirCare Plus℠ in California 2:00-3:30pmDiscussion: Next Steps - Use of the data for additional analyses Options for Assessing Expected Value Savings Recommendations to the RTF - January 5, 2010

3. PNW Regional Summary 226 RTUs Serviced/Measured! Avista = 6 pairs to be metered Bonneville Power Administration RTU Pilot = 150 metered + 11 from Avista - 2008 Energy Trust of Oregon = 15 metered/94 total Idaho Power = 9 metered Puget Sound Energy = 41 metered

4. Idaho Power RTU 3 sites, 3 units per site, 12 months all units (Sept. 09 – Sept. 10) Level 1 monitoring 2 per site Level 2 monitoring 1 per site Heating signal at 1 unit per site Heavy equipment supply/repair; title insurance company; wholesale beverage

5. Idaho Power RTU Summary Results

6. Interpretation of Results - Idaho 2 units fan power increase due to filter cleaning 1 unit incomplete economizer damper opening 2 units fan schedule increase to 24 hours, major losses 1 unit fan schedule reduction, major savings 1 unit properly operating in pre-retrofit 2 units failure to set back schedule

7. Take Away Results - Idaho Net savings all RTUs: - 4,700 kWh/yr Savings target for refined settings: 23,000 kWh dependent on schedule settings

8. Favorable Schedule Change - Idaho

9. A Puzzle - Idaho This unit had a significant economizer improvement. Why did slope increase?

10. Maximum Power Signatures - Idaho Fan power decreased from ~1.5 kW to 1.4 kW due to filter replacement because flow increased Post-retrofit power increased for both stages due to flow increase, more cooling delivered Increased cooling doesn’t reduce cooling energy because thermostat setting not achieved

11. Next Steps - Idaho Properly set schedules Monitor winter operation –consider morning warm up Next summer establish improved post-retrofit performance and savings

12. California RTU Monitoring About 300 RTU new replacements instrumented for post-retrofit air-side output and electrical input No pre-retrofit measurement – “empirical pre- retrofit baseline drawn from selected samples” Monitored for 1-2 summer months Differ from NW monitoring by inclusion of return RH and Supply Air Temp with hourly data structure not average daily structure Results are normalized to performance efficiency Reconciliation with DEER modeling

13. California Results Example 1 Analytic Target: Monitored performance as EER vs. Temperature

14. California Results Example 2 Monitored performance Compared to DEER

15. Summary Results - CA Results to be published 12/21/09 Observed performance generally lower than modeled expectation

16. Regional Results Database Results from all programs will be entered Primary structure a directory tree with each program results as a separate directory Each directory: unit raw data/template + results summary for each units + site/unit characteristics & service measures Uniform format not being designed Summary data will include selected site/unit characteristics

17. Database Summary View Site Summary Site ID RTU ID Weather data Annual kWh pre Annual kWh post Compressor stages Compressor max duty (frac of full load) Economizer (y/n) Monitoring level Pre- and Post- Service Summary Fan kW Fan duty (frac of full load) Baseload kWh/day Balance point temp Slope kWh/day/degF Demand @ 80 deg F, Stage 1&2 kW Compressor trigger degF

18. Database Format Refinements The format will change to accommodate the economizer analysis made possible by the Y1 signal most recently being monitored The format will change to accommodate more detailed descriptions of measures applied The summary row proceeds from the current template. Other analysis approaches and revised templates may have different summary row formats

19. Use of Regional RTU Data Data to be available through NPCC site Getting 8760 results/analysis/EER vs Temp EUI per conditioned sf Sensitivity analysis on methodology IPMVP Method B analysis: 2 week data only Correlating data to building characteristics - partial data available Annual savings methodology using signatures

20. RTUG Next Steps Prepare presentation to RTF Discuss with NPCC staff, RTU database implementation + integration with other regional buildings-related database(s) Further development of ‘Expected Value Savings’ [aka Deemed Savings] Continue communications with California organizations