Add Doors to Open Multi-deck Cases: Provisional UES

RTF MeetingAugust 30, 2011

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Thanks to All Participants

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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 DOE2.2r simulation

• Requesting Provisional UES Status

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Proposed Provisional UES Values

Measure

Site Savings (kWh/ft)

Site Savings

(therms/ft)Measure

Life

Capital Cost ($/ft)

TRC B/C Ratio

Door Retrofit- No night covers in Baseline/Multiplex Compressor- Seattle, WA 457.2 57.4 12 $566 1.9

Door Retrofit- Night covers in Baseline/Multiplex Compressor- Seattle, WA 415.2 51.9 12 $566 1.8

Door Retrofit- No night covers in Baseline/Stand-alone Compressor- Seattle, WA 477.4 57.4 12 $566 2.0

Door Retrofit- Night covers in Baseline/Stand-alone Compressor- Seattle, WA 432.7 51.9 12 $566 1.8

Door Retrofit- No night covers in Baseline/Multiplex Compressor- Spokane, WA 419.1 51.7 12 $566 1.8

Door Retrofit- Night covers in Baseline/Multiplex Compressor- Spokane, WA 377.5 46.5 12 $566 1.6

Door Retrofit- No night covers in Baseline/Stand-alone Compressor- Spokane, WA 436.7 51.7 12 $566 1.8

Door Retrofit- Night covers in Baseline/Stand-alone Compressor- Spokane, WA 392.7 46.5 12 $566 1.6

Door Retrofit- No night covers in Baseline/Multiplex Compressor- Billings, MT 417.3 48.0 12 $566 1.7

Door Retrofit- Night covers in Baseline/Multiplex Compressor- Billings, MT 371.6 43.1 12 $566 1.5

Door Retrofit- No night covers in Baseline/Stand-alone Compressor- Billings, MT 433.9 48.0 12 $566 1.8

Door Retrofit- Night covers in Baseline/Stand-alone Compressor- Billings, MT 386.1 43.1 12 $566 1.6

Standard Protocol Checklist

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

Modeling Methodology

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• 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

DOE2.2R- Modeling Constants

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DOE2.2R- Key Variables

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Case Refrigeration Load

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Compressor Energy Use

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Whole Building Energy Use

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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.

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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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Issues Resolved in Subcommittee

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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.

Strip Curtains

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• 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

Strip Curtains

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• 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