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Retrofit Doors to Open Vertical Cases
Provisional UES Proposal Presentation to the Regional Technical Forum
August 30, 2011
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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 calibrated DOE2.2r simulation
• Requesting Provisional UES Status
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UES Analysis Summary
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Appendix A: Provisional UES Checklist
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Appendix B: UES Measure Summary
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Implementation and Product Standards
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• No anti-sweat heat in door glass, frames or mounting equipment
• Total lighting power may not be increased as a part of the retrofit
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Estimation Procedure
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• Modeled using DOE 2.2R to capture interactive effects
• “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
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Model Calibration: Whole Building
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Model Calibration:Compressor Energy Use
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Model Calibration- Baseline:Case Refrigeration Load
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Total case load based on ANSI/ASHRAE 72 testing = 1600 btu/hr-ft
ASHRAE data used to disaggregate load components
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Model Calibration – Efficient-Case: Fixture Refrigeration Load
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Costs Estimated
• All measure variants: $566/ft
• Average of 4 bids from 2 vendors
• Includes additional costs from minor system upgrades required to compensate for reduced load (replace expansion valves, etc.)
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Measure Effective Useful Life
• EUL: 12 years
• Source: CALMAC
• Assumes display cases have a 16 year EUL and have expended 25% of EUL
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Reliable Efficient Case Data
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Calibration Plan• Collect Metered Data
– Rack: Volts, Amps, PF– Condenser: Volts, Amps, PF– Defrost: 1-time Voltage reading, Amps– HVAC Unit: 1-time Voltage reading, Amps– Hourly Natural Gas via Utility Interval Meter– Hourly Outside Air Temperature
• Minimum 3 weeks baseline • Minimum 3-weeks post
– This is a direct load measure. We expect less seasonal interaction than system measures like floating head pressure.
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Calibration Plan• Develop regressions for daily or hourly
refrigeration use correlated to ambient temperature
• Annualize using TMY data– Pre, Post and Savings (Pre minus Post)
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Calibration Plan
• Collect DOE2.2r inputs per data collection specifications• Use inputs to run DOE2.2r for Baseline & Post estimates
of total refrigeration energy• Compare estimates of Baseline, Post & Savings
estimates of refrigeration energy to best-practice estimates
• Modify DOE2.2r models and iterate tests until both baseline energy use, post energy use and energy savings at all sites are reasonable and there is no significant bias.
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Proposed Provisional UES Values
Measure
Site Savings (kWh/ft)
Site Savings
(therms/ft)Measure
LifeCapital
Cost ($/ft)TRC B/C
Ratio
Door Retrofit- No night covers in Baseline/Multiplex Compressor- Seattle, WA 457.2 57.4 12 $566 2.2
Door Retrofit- Night covers in Baseline/Multiplex Compressor- Seattle, WA 415.2 51.9 12 $566 2.0
Door Retrofit- No night covers in Baseline/Stand-alone Compressor- Seattle, WA 477.4 57.4 12 $566 2.2
Door Retrofit- Night covers in Baseline/Stand-alone Compressor- Seattle, WA 432.7 51.9 12 $566 2.0
Door Retrofit- No night covers in Baseline/Multiplex Compressor- Spokane, WA 419.1 51.7 12 $566 2.0
Door Retrofit- Night covers in Baseline/Multiplex Compressor- Spokane, WA 377.5 46.5 12 $566 1.8
Door Retrofit- No night covers in Baseline/Stand-alone Compressor- Spokane, WA 436.7 51.7 12 $566 2.0
Door Retrofit- Night covers in Baseline/Stand-alone Compressor- Spokane, WA 392.7 46.5 12 $566 1.8
Door Retrofit- No night covers in Baseline/Multiplex Compressor- Billings, MT 417.3 48.0 12 $566 1.9
Door Retrofit- Night covers in Baseline/Multiplex Compressor- Billings, MT 371.6 43.1 12 $566 1.7
Door Retrofit- No night covers in Baseline/Stand-alone Compressor- Billings, MT 433.9 48.0 12 $566 2.0
Door Retrofit- Night covers in Baseline/Stand-alone Compressor- Billings, MT 386.1 43.1 12 $566 1.8
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RTF Proposed Motion:
“I _________ move that the RTF approve the UES for Adding Doors to Medium Temperature Open Vertical Refrigerated Display Cases under provisional status with a sunset date of August 31st, 2013.