out-of-compliance grocery ues measure recommendations

Out-Of-Compliance Grocery UES Measure Recommendations

Regional Technical ForumJune 17, 2014

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Presentation Outline• Background• Measure Overview• Staff Highlighted Areas• UES Workbook

– Measure Descriptions– Measure Analysis and Input Details– Savings, Cost, and Cost Effectiveness

• RTF Staff Recommendation• Proposed Decision

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Background

• Multiple Grocery measures found Out-of-Compliance– Subsequent analysis determined remaining potential small– Extended sunset date at November 2013 meeting– Staff to develop plan to bring back into compliance

• Grocery measures in question:1. ECMs for Walk-ins – Done2. Walk-in Evaporator Fan ECMotor Controllers – Done3. Compressor Head Fan Motor Retrofit to ECM – Done 4. Display Case LEDs (Open Cases)5. Floating Head Pressure Controls for Single Compressor Systems6. Door Gasket Replacement7. Auto Door Closers8. Strip Curtains

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Background – Remaining PotentialRegional Priority Sector Measure

Remaining Potential

aMW (Cadmus)

Remaining Potential aMW

(PECI)Notes

1 Grocery Grocery - Display Case LEDs (Open Cases)

0.48 N/A Measure of interest for PECI

2 Grocery Grocery - Floating Head Pressure Controls for Single Compressor Systems

0.46 0.06Remaining potential is small for PECI program (when measure is limited to grocery sector)

3 Grocery Grocery - Autoclosers 0.26 0.21 Remaining potential is small for PECI program

3 Grocery Grocery - Door Gasket Replacement 0.65 0.021 Remaining potential is small for PECI program

3 Grocery Grocery - Strip Curtains 1.61 0.015 Remaining potential is small for PECI program

Note: Remaining potential based on PNW territory only.

http://rtf.nwcouncil.org/measures/measure.asp?id=105









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What hasn’t been done

• Estimating measure interactions very limited– Only looked at HVAC interaction within measure– Possible to have interactions among measures

RTF Measure Interactions

Auto Door Closers

Display Case LEDs (Open Cases)

Door Gasket Replacement

Floating Head Pressure Controls for Single Compressor Systems

Strip Curtains

Auto Door Closers x x


Door Gasket Replacement x x

Floating Head Pressure Controls for Single Compressor Systems

Strip Curtains x x

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What direction to take?

• Can ask RTF staff to:– Bring measure back including interactions

• Will need to define a “full package” for grocery refrigeration cases

– Estimate interactions among measures• RTF professional judgment

– Ignore interactions

• Staff estimate is that interactions are likely small and do not warrant further research.– Furthermore, estimation methods of measures are varied and it may

not be practical to reliably determine interactions• Should staff resources be spent on estimating measure

interactions for measures the RTF has categorized as Small Savers?

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Measure Overview

• What does it do?– Either:

• Replaces existing fluorescent lamps on Open Display Cases with LEDs

• Installs LEDs in new cases instead of fluorescent lamps• De-lamps fluorescent lamps in existing cases

– Savings occur from:• Wattage reduction of lamps• Runtime and load reduction of refrigeration system• Load reduction on store HVAC heating system

– Assuming grocery stores heat most of the year

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Recommendation Memo ItemsRecommendation Memo Item Staff Response

The Hours of Operation parameter needs to be based on metered data.

Small Saver status negates the need to collect primary data. Will use Hours of Operation derived in other RTF approved grocery measure (i.e. ASHC).

The Portion of lamp energy rejected to the refrigerated space parameter should be based on measured data or engineering analysis.

Small Saver status negates the need to collect primary data. Will use DOE TSD which estimates this parameter.

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Staff Highlighted Areas

• Measure specs– Changed measure spec to align with BPA

implementation which states that efficacy of LED lights must be within 10 lumens/watt of Design Lights Consortium specifications.

– Removed requirement for permanently installed fixture (drop-in replacement lamps now allowed)

• LED life– Manufacturer rating of 50,000 hours used

• Results in a 7 year EUL based on HOU

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Savings, Cost, & Cost Effectiveness

• Go to the following sections in the Presentation tab in the proposed measure workbook:– Measure savings– Measure costs– Measure TRC B/C ratios

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RTF Staff Recommendation• Use manufacturers claim of LED life in

estimating EUL• Restrict RTF-approved period to 2 years to look

at persistence of drop-in LED lamps• Approve the ‘Display Case LEDs (Open Cases)’

UES measure as a “Small Saver”• Set the measure status to “Active”• Set the sunset date to June, 2016 to account

for rapidly evolving LED technology

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Proposed Decision

“I _______________ move that the RTF:

• Approve the ‘Display Case LEDs (Open Cases)’ measure as a “Small Saver” UES;

• Set the measure status to ‘Active;’ and

• Set the sunset date to June, 2016.”

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Floating Head Pressure Control on Single Compressors

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Measure Overview

• What does it do?– Installs Floating Head Pressure Controls on single

compressor systems• Allows head pressure of system to follow ambient dry

bulb temperature instead of preset on/off operation based on cut-in/cut-out pressures

– Savings occur from:• Load reduction of refrigeration system

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The review team did not have access to the eQuest simulation models used to derive energy savings by Compressor Size, climate zone, and case temperature. Climate Weighting Factors do not match the climate zone maps produced by the RTF.

PECI provided eQuest models and updated compressor sizing by case temp. Grocersmart climate weights more representative than RTF residential weightings.

The source of Suction Temperature Setpoints is not cited. Condensing Unit MT: 12°FCondensing Unit LT: -23°FRemote Condenser MT: 17°FRemote Condenser LT: -20°F

Based on Professional Judgment and used in eQuest analysis.

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Staff Highlighted Areas• Measure spec

– Clarified that measure is applicable to grocery sector only

• Remaining potential that qualifies this as a small saver is based on this assumption

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Updated Compressor Weights

1.00 2.00 3.00 5.00 7.50 10.00 Total0

100200300400500600700800900

MT Compressor Weighted Savings

Previous Weighting Current Weighting

HP

Savi

ngs (

kWh/

yr)

1.00 2.00 3.00 5.00 7.50 10.00 Total0

100200300400500600700800900

LT Compressor Weighted Savings

Previous Weighting Current Weighting

HP

Savi

ngs (

kWh/

yr)

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RTF Staff Recommendation• Restrict measure to grocery sector only• Approve the ‘Floating Head Pressure Control

on Single Compressors’ UES measure as a “Small Saver”

• Set the measure status to “Active”• Set the sunset date to June, 2019

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Proposed Decision


• Restrict measure to grocery sector only

• Direct staff to look at potential for FHPC outside of the grocery sector and bring back to RTF at next meeting

• Approve the ‘Floating Head Pressure Control on Single Compressors’ measure as a “Small Saver” UES;



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Door gaskets on walk-ins and reach-ins

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Measure Overview

• What does it do?– Replaces existing worn gasket with new gasket– Savings occur from:

• Runtime reduction on refrigeration system• Load reduction on store HVAC heating system


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The savings estimates are laboratory tests on one reach-in freezer and one walk-in environmental unit configured to simulate conditions of a walk-in freezer and a walk-in cooler with simulated damaged and undamaged gaskets. These limited test conditions do not meet the standards for statistical, meta-statistical, or calibrated engineering methods of estimating savings. A larger sample of test conditions is required to validate the conclusions.

Designation as small saver negates the need for more primary data collection. Existing data and Professional Judgment to be used instead.

Three of the four measures are directly supported by individual laboratory test procedures as performed by Emerson Technologies. However, the savings figure for the reach-in glass doors medium temperature measure is simply estimated assuming a 67% factor of the reach-in glass door low temperature measure figures.

Designation as small saver negates the need for more primary data collection. Existing data and Professional Judgment to be used instead.

The measure definition states that the new gasket “must replace a worn or damaged gasket.” This statement is too vague since it could apply to gaskets which are effective infiltration barriers as well as those which are not. This specification should be updated as a result of investigations into the condition of baseline gaskets

Using standard Hand Test. “If a hand can be placed through a gasket and a tear is 6” and greater, the gasket is considered damaged.”

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Staff Highlighted Areas• Changed measure spec to include “hand test”

to determine eligibility• Door open times

– Two sources exist for door open times, with varying results

• Gasket baseline– Many stores found to maintain gaskets outside

program; professional judgment needed

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Door Open Times

• Two studies provide different results on door open times

• Recommend using combination of both results– Weighted by ‘n’ in each sample

*Note: Using only PECI data for Low-temp walk-in since none metered in ADM study. Mean and median of those 4 sites is around 4.5%.

PECI ADM Combined

n Mean (Door Open) n Mean (Door Open) Mean (Door Open)

Low Temp Reach In 14 12.2% 46 2.8% 5.0%Medium Temp Reach In 5 0.4% 90 3.8% 3.6%Low Temp Walk In 4 4.5% - - 4.5%Medium Temp Walk In 15 14.9% 14 34.3% 24.3%

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Gasket Baseline• ADM study indicates high replacement rate even without

maintenance contracts (12 out of 71 had contracts)• Professional judgment needed on interpreting results

Table J‐3. Frequency of Maintaining Door Gaskets

Frequency of Maintenance Count PercentPercent (Re-sample)

Often 31 53% 58%Sporadically 11 19% 21%No 11 19% 21%Don't know 3 5% 0%Refused/Not Applicable 3 5% 0%Total 59 100% 100%

Table J‐5. Elapsed Years to Maintaining Gaskets

Years Count PercentPercent (Re-sample)

At least once a year 3 7% 8%Less than 2 years 5 12% 13%2 to 3 years 19 44% 48%3 to 4 years 7 16% 18%4 to 5 years 2 5% 5%More than 5 years 4 9% 10%Don't know 3 7% 0%Total 43 100% 100%

Source: Commercial Facilities Contract Group 2006-2008 Direct Impact Evaluation Study ID: PUC0016.03 Volume 3 of 3 HIM Appendices

79% 68% 53%

100%-53% = 47% de-rating factor

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Gasket Baseline

• Recommend applying Maintenance Adjustment Rate to savings estimate based on ADM evaluation findings– Accounts for gasket replacement being done in

grocery stores without maintenance contracts• Recommend restricting measure to stores

without maintenance contracts in place– If program did not check for maintenance contracts,

Maintenance Adjustment Rate would change from 47% -> 39%

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RTF Staff Recommendation• Use the combined study samples to estimate

door open times• Restrict the measure to stores without

maintenance contracts• Incorporate the Maintenance Adjustment Rate• Approve the ‘Door Gaskets’ UES measure as a

“Small Saver”• Set the measure status to “Active”• Set the sunset date to June, 2019

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Proposed Decision


• Use the combined study samples to estimate door open times

• Restrict the measure to stores without maintenance contracts

• Incorporate the Maintenance Adjustment Rate

• Approve the ‘Door Gaskets’ measure as a “Small Saver” UES;



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Door Auto Closer on walk-ins and reach-ins

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Measure Overview

• What does it do?– Installs a new Door Auto Closer on existing walk-in

or reach-in case that either has one that is broken or does not have one at all

– Savings occur from:• Runtime reduction on refrigeration system• Load reduction on store HVAC heating system


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The amount of time that doors are normally unintentionally left ajar, the Doorway Open Time Factor, is set at 25% of daily hours for all four measures. This assumption needs to be based on measured data.

Small Saver negates the need to collect primary data. Door open time based on ADM study and PECI measured data from gasket test as a baseline. Professional judgment will be needed for reduction in door open time.

The savings figure for the reach-in glass doors medium temperature measure is estimated assuming a 66% factor of the reach-in glass door low temperature measure figures. Support with data.

Small saver negates need to collect primary data. Professional Judgment will be used.

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Staff Highlighted Areas• Unintentional door open time

– Based on professional judgment only

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Unintentional Door Open Time

• Value is meant to represent time door is left unintentionally open– Not the same as door open/close times for

accessing product• Use gasket study open times as a reality test

Weighted average of all sites Mean

Minutes open per day

Autocloser reduction in

unintentional time left open

Minutes unintentionally

left open per day

Hours unintentionally

left open per day

Low-temp Reach-in Avg. 5.0% 71 25.0% 18 0.3

Med-temp Reach-in Avg. 3.6% 52 25.0% 13 0.2

Low-temp Walk-in Avg. 4.5% 64 25.0% 16 0.3

Med-temp Walk-in Avg. 24.3% 350 25.0% 87 1.5

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RTF Staff Recommendation• Maintain door open time estimate of 25%• Approve the ‘Door Auto Closer’ UES measure

as a “Small Saver”• Set the measure status to “Active”• Set the sunset date to June, 2019

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Proposed Decision


• Approve the ‘Door Auto Closer’ measure as a “Small Saver” UES;



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Strip Curtains on Walk-ins

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Measure Overview

• What does it do?– Installs a strip curtain on a walk-in freezer or

cooler where none existed before (so my picture was a little misleading)

– Savings occur from:• Load reduction of refrigeration system• Load reduction on store HVAC heating system


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The measure definition should clarify whether or not the measure applies to walk-in units with loading dock exterior doors. The average environmental temperatures used in the ADM HIM report apparently include some fraction of exterior spaces.

The HVAC interaction factor has a small impact on savings. However infiltration air is large. Professional judgment needed.

Research Plan called for the collection of Time Door Open per Day for both pre- and post-installation periods to ensure the savings calculations account for any post installation variation in door open times. Results were presented from metering in August 2011, which showed that the results were not statistically significant. New data is needed.

Should we use non-statistically significant data for this parameter? Professional judgment needed.

The values for the Temperature of Surroundings parameter, which are found on the “Assumptions” worksheets for the various building types, need to be based on regional measured data.

If limited to walk-ins that no exterior doors, likely that surrounding temperatures are similar in CA grocery stores compared to the PNW.

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Staff Highlighted Areas• Temperature of Surroundings Parameter

– Some walk-ins open to unconditioned spaces– No adjustment for PNW compared to CA

• Strip Curtain Takeback– Do door open times increase after strip curtains

are installed• Strip Curtain baseline

– Many stores found to maintain strip curtains outside program; professional judgment needed

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Temperature of Surroundings

• Used to determine infiltration air temp• A small swing of infiltration temp produces a large swing

in savings– Savings increase as infiltration temp increases

• ADM study results use storage area temps in respective establishments– These include some indoor and unconditioned zones

• No easy way to access ADM data on climate zone weightings to discern % or outdoor/indoor walk-ins used

• Recommend limiting measure eligibility to walk-ins that open to conditioned spaces only– Likely that storage areas/grocery stores same in PNW and CA

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Strip Curtain Takeback

• Door open time is a primary determinant• No statistical data on door open times

– Definitely none for strip curtain post-install• Some evidence does suggest significant

takeback can occur

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PECI Data- Cooler (n=10)

PECI Data- Freezer (n=3)

CPUC Data- Cooler (n=14)

CPUC Data- Freezer (n=9)

BPA Data- Cooler (n=10)

BPA Data- Freezer (n=4)

0

50

100

150

200

250

300

350

400

Pre

Post

Door

Ope

n Ti

me

(Min

/Day

)

August 2011 RTF presentation

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December 2007 BPA M&V presentation

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Strip Curtain Takeback• Effect of adjusted post-install times on savings

• Range of 9% -> 20% savings difference

Cooler walk-in door

Freezer walk-in door

Cooler walk-in door


Cooler walk-in door


Cooler walk-in door

-

100

200

300

400

500

600

700

160% increase in post-install Door open times

Current Door Open Time Increased Door Open Time

Savi

ngs (

kWh/

yr/s

qft)

Cooler walk-in Freezer walk-in Cooler walk-in Freezer walk-in Cooler walk-in Freezer walk-in Cooler walk-inPre-install door open time (mins) 45 38 38 9 132 102 494

Post-install door open time (mins) 72 61 61 14 211 163 790

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• Recommend incorporating some level of takeback in estimate– BPA single case study shows ~160% in post case

• No significant data on this estimate• Up to RTF professional judgment

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Strip Curtain Baseline• Similar to gaskets: Many stores already doing maintenance

regardless of contracts• Professional judgment needed on interpreting results

Source: Commercial Facilities Contract Group 2006-2008 Direct Impact Evaluation Study ID: PUC0016.03 Volume 3 of 3 HIM Appendices

65% 76% 49%

100%-49% = 51% de-rating factor

Table K‐4 Respondents Reporting That They Do Maintenance

Frequency of Maintenance Count Percent

Percent (Re-sample)

Yes 20 61% 65%No 11 33% 35%Don't know 2 6% 0%Total 33 100% 100%

Table K‐5. Frequency of Maintaining Strip Curtains

Years Frequency Percent

Percent (Re-sample)

At least once a year 8 40% 47%Less than 2 years 1 5% 6%2 to 3 years 4 20% 24%3 to 4 years 2 10% 12%More than 5 years 2 10% 12%Don't know 1 5% 0%Refused/Don't Know 2 10% 0%Total 20 100% 100%

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RTF Staff Recommendation• Takeback effect has a very large a swing in

savings and very little data to support it.– Even as a small saver, savings my be vastly different

than expected– If you increase door open times enough, savings

can drop to zero (or beyond)• Staff recommends deactivating measure unless

some data can be used to support post-install door open times

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Proposed Decision


• Deactivate the ‘Strip curtains’ UES measure.

out-of-compliance grocery ues measure recommendations

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