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Out-Of-Compliance Grocery UES Measure Recommendations. Regional Technical Forum July 15, 2014. Presentation Outline. Background Measure Overview Staff Highlighted Areas UES Workbook Measure Descriptions Measure Analysis and Input Details Savings, Cost, and Cost Effectiveness

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out of compliance grocery ues measure recommendations

Out-Of-Compliance Grocery UES Measure Recommendations

Regional Technical Forum

July 15, 2014

presentation outline
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
background
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:
    • ECMs for Walk-ins – Done
    • Walk-in Evaporator Fan ECMotor Controllers – Done
    • Compressor Head Fan Motor Retrofit to ECM – Done
    • Display Case LEDs (Open Cases) - Done
    • Floating Head Pressure Controls for Single Compressor Systems - Done
    • Door Gasket Replacement - Done
    • Auto Door Closers
    • Strip Curtains
background remaining potential
Background – Remaining Potential

Note: Remaining potential based on PNW territory only.

what hasn t been done
What hasn’t been done
  • Estimating measure interactions very limited
    • Only looked at HVAC interaction within measure
    • Possible to have interactions among measures
rtf direction to take
RTF direction to take
  • Last time RTF agreed with staff recommendation to ignore interactions for these small saver grocery measures
    • 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
measure overview
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
        • Assuming grocery stores heat most of the year
staff highlighted areas
Staff Highlighted Areas
  • Unintentional door open time
    • Based on professional judgment only
    • Savings vary by orders of magnitude within the range of reasonable assumptions
unintentional door open time
Unintentional Door Open Time
  • Value is meant to represent time door is left unintentionally open (i.e. almost closed)
    • Not the same as door open/close times for accessing product
  • Gasket study open times as a reality test
unintentional door open time1
Unintentional Door Open Time
  • But savings are directly proportional to this estimate, with no data to support it
savings cost cost effectiveness
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
rtf staff recommendation
RTF Staff Recommendation
  • Deactivate measure due to high uncertainty in Doorway Open Time Factor and resulting high uncertainty in savings.
  • Set the measure status to “Deactivated”
proposed decision
Proposed Decision

“I _______________ move that the RTF set the measure status of the ‘Door Auto Closer’ measure to ‘Deactivated.’”

measure overview1
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
        • Assuming grocery stores heat most of the year
staff highlighted areas1
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?
    • Results are only moderately sensitive to this effect.
  • Strip Curtain EUL
    • CA program evaluation found that measure was typically replaced well before commonly assumed lifetime.
temperature of surroundings
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 % of 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
    • Walk-ins that open to outdoor spaces have higher infiltration air temps; savings potential may be much larger
strip curtain takeback
Strip Curtain Takeback
  • Door open time is a primary determinant
  • Some data on pre-install door open time
  • No statistical data on the ratio of post- to pre-install door open times
  • Some anecdotal evidence does suggest significant takeback can occur (i.e. post/pre ratio > 1)
  • Results only vary by a factor of 2 across a wide range of assumptions (from post/pre ratio of 0.25 to 3).
example of pre and post door open times1
Example of Pre- and Post- Door Open Times

December 2007 BPA M&V presentation

strip curtain takeback1
Strip Curtain Takeback
  • Effect of varying post-install times on savings.
strip curtain takeback2
Strip Curtain Takeback
  • Recommend incorporating some level of takeback in estimate to
    • reflect anecdotal evidence
    • place savings in the middle of the range of reasonable estimates
      • Staff using a ratio of 2:1 for post-pre door open times
  • No significant data on this estimate
  • Up to RTF professional judgment
strip curtain lifetime
Strip Curtain Lifetime
  • Typical EUL is four years.
  • However, CA impact evaluation found that program-installed strip curtains were typically maintained more frequently.

These findings suggest a mean time to replacement of 2 to 3 years.

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

savings cost cost effectiveness1
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
rtf staff recommendation1
RTF Staff Recommendation
  • Limit eligibility of measure to walk-ins that open to conditioned spaces only
  • Assume a level of takeback that results in savings in the middle of the range of possible savings.
    • Staff recommends a post/pre door open time ratio of 2.
  • Set measure life to 2.5 years.
proposed decision1
Proposed Decision

“I _______________ move that the RTF:

  • Approve the ‘Strip Curtain’ measure as a “Small Saver” UES;
    • Limited to walk-ins that open to conditions spaces only
    • Using a post-install to pre-install door open time ratio of 2.0
    • Using a measure life of 2.5 years
  • Set the measure status to ‘Active;’ and
  • Set the sunset date to July, 2019.”
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