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Strip Curtains for Refrigerated Walk-in Boxes

Strip Curtains for Refrigerated Walk-in Boxes. Michele Friedrich, PE – Sr. Engineer Eric Mullendore – Energy Analyst PECI 8/3/2010. Purpose. Approval for new deemed measures for retrofitting strip curtains to walk-in coolers and freezers. Agenda. Proposed Measures

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Strip Curtains for Refrigerated Walk-in Boxes

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  1. Strip Curtains for Refrigerated Walk-in Boxes Michele Friedrich, PE – Sr. Engineer Eric Mullendore – Energy Analyst PECI 8/3/2010

  2. Purpose Approval for new deemed measures for retrofitting strip curtains to walk-in coolers and freezers

  3. Agenda Proposed Measures How do they save energy? CPUC EM&V Report Adapting savings for PNW Costs Effective Useful Life/Persistence Program Specifications Conclusions

  4. Proposed Measures

  5. How do they save energy? ASHRAE Refrigeration Handbook, 2006.

  6. CPUC/ADM EM&V Report Methodology Measured the infiltration rates using tracer gas Measured temperatures, relative humidities and door open times with loggers Calculated annual kWh savings using data above as inputs into an hourly bin model Commercial Facilities Contract Group: 2006-2008 Direct Impact Evaluation, Study ID: PUC0016.01; Prepared by ADM Associates, Inc. et al. February 2010.

  7. CPUC/ADM Report Results

  8. Adapting Results for PNW • Adjust for EER values found in PNW climate zones and system types* • Adjust baseline barrier efficacy to reflect program design • *EER and FLH values derived from DOE2.2R runs for various system types in PNW climate zones.

  9. Energy Savings Assumptions

  10. Baseline Efficacy Adjustment

  11. Energy Savings Calculations

  12. Energy Savings Calculations where, I = refrigeration load from infiltration when door is open, Btu/hr Dt = doorway open-time factor Df = doorway flow factor E = barrier efficacy

  13. Comparison of Methodologies

  14. Costs • Installed Cost: $9.77/ sq ft • Average from 20 projects in the PNW • Represents pricing of 7 trade allies • Projects ranged from 1 to 8 walk-in doors

  15. Effective Useful Life • 4 years • Value recommended by CALMAC* • ODOE estimates 5 years‡ • Supported by program design • *California Measurement Advisory Committee Public Workshops on PY 2001 Energy Efficiency Programs. September 2000, p. 60. • ‡SEED Guidelines, Appendix J.

  16. Persistence Assured • SDG&E Persistence Assured Strip Curtain Program • Implemented by PECI (2006-2008) • Annual site inspection and maintenance • Failure to persist resulted in rebate ‘clawback’

  17. Persistence Results • Initial 2 Year 4 Year • ParticipationPersistence Persistence* • Sites: 405 95% 75% • Doors: 902 96% 82% *Not all sites have been reviewed for 4 year persistence. Values displayed in this column represent the 81% of the sites verified to date.

  18. Program Specifications • Must install Strip Curtains where no infiltration barriers are currently in use • Claimed savings and rebate value will vary by site type • Program will track and report persistence

  19. Conclusion PECI seeks approval for the following deemed measures:

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