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

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

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

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

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

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

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.