Add Doors to Open Multi-deck Cases: Provisional UES

1. Add Doors to Open Multi-deck Cases: Provisional UES RTF Meeting August 30, 2011

2. Thanks to All Participants

3. Measure Summary • Retrofitting insulated glass doors to existing medium temperature open multi-deck cases • Provisional savings estimates ~440-kWh/lin ft and 52-therms/lin ft • Based on a DOE2.2r simulation • Requesting Provisional UES Status

4. Proposed Provisional UES Values

5. Standard Protocol Checklist Link: Appendix A - Guidelines Checklist Grocery Refrigeration Systems.xlsx

6. Modeling Methodology • Modeled using DOE 2.2R • “Typical” store was built using GrocerSmart Audit Data • Multiplex Baseline assumes Floating Head Pressure, T8 lamps, and EC motors are in place. • Stand-alone system baseline assumes T8 lamps and EC motors. • Infiltration, conduction, and radiation load based on manufacturer data, the ASHRAE Refrigeration Handbook, and SCE lab test reports

7. DOE2.2R- Modeling Constants

8. DOE2.2R- Key Variables

9. Case Refrigeration Load

10. Compressor Energy Use

11. Whole Building Energy Use

12. Calibration Plan • Collect Metered Data • Rack: Volts, Amps, PF • Condenser: Volts, Amps, PF • HVAC Unit: 1-time Voltage reading, Amps • Hourly Natural Gas via Utility Interval Meter • Hourly Outside Air Temperature • Minimum 3 weeks baseline • Minimum 3-weeks post • This is a direct load measure. We expect less seasonal interaction than system measures like floating head pressure.

13. Calibration Plan • Develop regressions for daily or hourly refrigeration use correlated to ambient temperature • Annualize using TMY data • Pre, Post and Savings (Pre minus Post) 13

14. Calibration Plan • Collect DOE2.2r inputs per data collection specifications • Use inputs to run DOE2.2r for Baseline & Post estimates of total refrigeration energy • Compare estimates of Baseline, Post & Savings estimates of refrigeration energy to best-practice estimates • Modify DOE2.2r models and iterate tests until both baseline energy use, post energy use and energy savings at all sites are reasonable and there is no significant bias.

15. Issues Resolved in Subcommittee

16. RTF Proposed Motion: “I _________ move that the RTF approve the UES for Adding Doors to Open Multi-deck Cases under provisional status and place the measure Grocery-Night Covers Under Review.

17. Strip Curtains • 3 UES measures given provisional status on 8/3/2010 • Sunset date set as 8/3/2011 • A request was made at that time to investigate the measure impact on door open time • First rebate issued 11/30/2010

18. Strip Curtains • PECI has installed meters at 6 locations to collect door open times pre/post implementation • Initial results: not statistically valid • In the meantime: New UES guidelines • PECI proposes: extend sunset until it undergoes RTF subcontractor review