night covers on open vertical cases provisional ues proposal presentation to the regional technical...

Night Covers on Open Vertical Cases

Provisional UES Proposal Presentation to the Regional Technical Forum

August 30, 2011

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Thanks to All Participants

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Measure Summary

• Retrofitting night covers to existing medium temperature open multi-deck cases

• Provisional savings estimate 44 kWh/lin ft and 5 therms/lin ft

• Based on a calibrated DOE2.2r simulation

• Requesting Provisional UES Status

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Measure History• Night Covers (first version):

– Previously RTF-approved: March 2, 2009– Includes separate savings values for applying night

covers to vertical and horizontal refrigerated display cases

– Calculation methodology: uncalibrated engineering calculations

• Vertical Night Covers– Updated UES to replace existing value, which is out-

of-compliance

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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 night cover may be present in baseline

• Minimum 1 year manufacturer’s warranty

• Minimum application of 6 hours/ 24 hour period

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 report

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: Case Refrigeration Load

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Cost Estimates

• Cost estimate: $36/ft

• Unchanged from previously accepted cost value

• Supported by invoice levels observed by program

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Measure Effective Useful Life

• EUL: 5 years

• Unchanged from previously accepted EUL

• Supported by 1 year warranty requirement

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Reliable Efficient Case Data

Calibration Plan• Collect Metered Data

– Rack: Volts, Amps, PF– Condenser: Volts, Amps, PF– 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 Value

Measure

Site Savings (kWh)

Site Savings (therms)

Measure Life

(years)

Capital Cost

($/unit)

TRC B/C

Ratio

Night Covers- Retrofit to Open Vertical Case on Multiplex - Seattle, WA 42.0 5.5 5 $36 1.5

Night Covers- Retrofit to Open Vertical Case on Stand-alone - Seattle, WA 44.7 5.5 5 $36 1.6

Night Covers- Retrofit to Open Vertical Case on Multiplex - Spokane, WA 41.6 5.2 5 $36 1.5

Night Covers- Retrofit to Open Vertical Case on Stand-alone - Spokane, WA 44.0 5.2 5 $36 1.5

Night Covers- Retrofit to Open Vertical Case on Multiplex - Billings, MT 45.7 4.9 5 $36 1.5

Night Covers- Retrofit to Open Vertical Case on Stand-alone - Billings, MT 47.8 4.9 5 $36 1.6

Night Covers- Retrofit to Open Vertical Case - Average 44.3 5.2 5 $36 1.6

RTF Proposed Motion:

“I _________ move that the RTF approve the UES for Night covers on Open Vertical Refrigerated Display Cases under provisional status with a sunset date of August 31st, 2013.