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Update: Grocery Refrigeration Provisional Standard Protocol for

Site Specific Savings

RTF MeetingJune 28, 2011

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Measure Summary• Savings estimation

protocol for bundles of measures implemented in Grocery Stores

• Based on DOE2.2r simulations with method for specifying key simulation parameters

• Intend to request Provisional Status as Standard Protocol

Measure CategoryMeasure Type

Decrease open display case infiltration by adding doors or night covers. LoadReplace display case with new high efficiency display case. LoadDecrease Anti-sweat Heat by replacing display case doors or adding a controller. LoadDecrease walk-in fan motor electric use by installing a more efficient motor and/or motor speed controller. LoadRetrofit display case evaporator fan motor with high efficiency motor. LoadMinimize compressor suction and discharge pressure. SystemRetrofit or replace condenser with high efficiency condenser, evaporative-cooled or evaporative pre-cooled condenser. SystemReplace case and/or walk-in lighting with more efficient lighting. LoadRetrofit compressor head fan motor and/or condenser fan motor with higher efficiency motor. DirectReplace compressor with higher efficiency compressor. SystemReplace compressor with compressor with unloading capability and/or compressor with variable speed. SystemAdd or improve infiltration barrier to walk-ins LoadAdd display case and/or walk-in lighting motion sensor. Load

Replace door gaskets on display case and walk-in doors. Load

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MilestonesDate Item Result

2010 PECI Development of GS 4.0 with guidance from subcommittee at 7 meetings

•Selection and sensitivity testing for key inputs•Software QC approach reviewed•Libraries & other data sources reviewed

March 2011

Documentation methodology reviewed at subcommittee

Format & content are going in the right direction

April 2011

RTF meeting •Review documentation.•RTF tasks subcommittee to develop research plan to “calibrate” GS 4.0 with help of evaluators.

May 2011

Two subcommittee meetings. Report to RTF at May 3 meeting.

Develop approach to test GS4.0 against measured• Test refrigeration load estimates baseline & post• Both load and system measures need testing• Sampling strategy

June 2011

Two RTF staff meetings (Grist, Kendall, Baker, Baylon) with PECI. Plus two subcommittee meetings.

•Draft Protocol per Guidelines•Draft Research Plan•Written comments from 4 RTF•Broad agreement on approach & method•Review not completed in time for RTF meeting•Many complex issues applying Guidelines

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Subcommittee Summary• Eight subcommittee meetings since March 2011

– Notes on subcommittee page– Plus Six RTF Staff & PECI meetings

March 10, 2011 March 17, 2011 April 21, 2011 April 27, 2011 May 26, 2011 June 9, 2011 June 16, 2011 June 24, 2011Charlie Grist Charlie Grist Charlie Grist Charlie Grist Charlie Grist Charlie Grist Charlie Grist Charlie GristAdam Hadley Adam Hadley Lauren Gage Brian Owens Brian Owens Brian Owens Brian Owens Brian OwensTim Steele Bing Tso Crispin Wong Crispin Wong Mike Baker Mike Baker Mike Baker Mike BakerBrian Owens Brian Owens Mark Jerome Jeff Mitchell Jeff Mitchell Jeff Mitchell Jeff Mitchell Mark KendallJeremy Litow Levi Westra David Baylon Paul Schertz Mark Kendall Mark Kendall Mark Kendall Kerstein RockMike Baker Ryan Fedie Mike Baker Cory Corbett Levi Westra Levi Westra Levi Westra Michelle FriedrichBing Tso Tim Steele Mark Kendall Mike Baker Lauren Gage Kerstein Rock Bill Koran Andie BakerChris Pollow David Baylon Michele Friederich David Thompson Kerstein Rock Michelle Friedrich Kerstein Rock Jill SteinerLevi Westra Paul Schertz Cory Corbett Adam Hadley Michelle Friedrich Andie Baker Michelle Friedrich

Cory Corbet Christopher Rogers Adam Hadley Bill Koran Andie Baker Andie Baker

Michele Friedrich Jen Shafer Ken Keating Mark Kendall Mark Jerome Crispin Wong

Ryan Fedie Andy Baker Michele Friederich Ryan Fedie

Christopher Rogers Jeff Mitchell Eric Brateng

Jen Shafer Ryan Fedie Ken Keating

Brian Hulsizer Josh Rushton Tom Lienhard

David Baylon Eric Brateng David Baylon

Develop Approach to Test GS 4.0 Draft Protocol & Research Plan

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Standard Protocol ChecklistLink: ..\Prov Protocol\Appendix A - Guidelines Checklist GS4.0 Draft 1).xlsx

Checklist: Guidelines for the Development and Maintenance of RTF-Approved Measure Savings Estimates

Guideline Response Notes

1. Introduction and Purpose

Sponsor(s) PECIPortland Energy Conservation Inc. developed the proceedure for use in it's Grocer Smart program

Savings Estimation Method

Unit Energy Savings

Standard Protocol Yes Provisional Standard Protocol using DOE2.2r simulation

Custom Protocol

Program Impact Evaluation

Priority

2. Measure Specification

Measure Identifiers YesMultiple measures which reduce refrigeration load or increase refrigeration system efficiency. Specified by DOE2.2r Keywords. See Elligible Measures in Section 5 of protocol.

Savings Baseline Yes Varies by measure. Specified by DOE2.2r Keywords

Implementation Standards Yes Terms and Conditions of GS 4.0

Product Standards Yes Terms and Conditions of GS 4.0

4. Standard Protocol

Sufficient best practice data available YesProvisional status recommended to collect best-practice data under sampling application of Guidelines (section 4.4). See research plan to collect and analyze best practice data and test candidate protocol.

Provisional data collection requirements Yes

Collecting total refrigeration system electric consumption and other data needed for diagnostics. See protocol section 8 for the14 categories of measurement data. Data will be measured for a minimum of 3 weeks pre-implementation, and a period after implementation that is adequate to ensure that equipment response to a range of outside air temperatures is captured. Sample 10 sites in each of three size classes.

Provisional protocol documented Yes

Daily or hourly energy usage models will be developed for the baseline- and post-implementation periods, depending on which level of aggregation provides the best model precision. Models will use linear or linear change point regressions with outside air temperature as the primary independent variable. Annualization by using TMY data.

Calculator developed NoBest practice calculations to be developed. Candidate standard protocol calculator has been developed (GS 4.0 with DOE2.2r simulation).

Provisional sunset criteria YesValid until sufficient data are collected. Sunsets if significant change in measures or measure baseline.

Simplest reliable method defined No

Standard protocol documented No

Calculator revised for simpliest reliable method No

Standard protocol sunset criteria No

Standard protocol under review No

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Status of Protocol & Research Plan

• Outline research plan by committee in May• Initial drafts by PECI June 14, 2011• Written comments from: Mike Baker, Charlie

Girst, Andie Baker, Ryan Fedie• PECI revised based on written comments and

June 23, 2011 subcommittee• Link to current draft protocol• Link to current draft research plan

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Provisional Status Conditionsfrom Operative Guidelines

• Programs which use provisional protocol agree to provide the data that are collected to the RTF so that they can be used to complete the development of the protocol

• Once a simplified method is proven reliable, the standard protocol documentation and associated calculator will be modified to be consistent with that method

• Sunset criteria must be assigned to provisional standard protocols

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Major Elements• Measure total short-term refrigeration energy use and key

variables– Baseline & Post case

• Annualize short-term estimates of refrigeration energy using TMY data and other key variables

• Compare annualized estimates of measured refrigeration energy to GS 4.0 estimates of refrigeration energy both baseline and post

• Compare savings estimates for packages of measures installed– Use subtraction method, interrupted time series or change model – Savings = Refrigeration Energy Baseline minus Post

• With appropriate adjustments to normalize post-condition changes (such as refrigeration load)

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Best-Practice Estimate

• Minimum 3 weeks baseline & post– Longer post for measures sensitive to ambient

temperature (floating head pressure control)• Develop regressions for daily or hourly

refrigeration use correlated to ambient temperature & other independent variables

• Annualize using TMY data– Pre, Post and Savings (Pre minus Post)

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Reason for 3-Week Measurement for Best Practice Method: Seasonally Consistent Refrigeration Energy Use

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec0

0.5

1

1.5

2

2.5

3

3.5

ELCAP Grocery Data, Monthly Refrigeration Energy (EUI), n=11

MeanMedianStd Dev

kWh/

sf

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Testing the Candidate Protocol (GS 4.0)

• Perform GS 4.0 Audit to collect DOE2.2r inputs per data collection specifications

• Use inputs to run DOE2.2r for Baseline & Post estimates of total refrigeration energy

• Compare GS 4.0 estimates of Baseline, Post & Savings estimates of refrigeration energy to best-practice estimates

• Modify GS 4.0 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• Measurements required for best-practice and candidate standard

protocol• Description & intended use of 14 measurement categories• See Section 8 of draft protocol

– Test bundle of measures, rather than individual measures• Does the protocol produce reliable estimates of the savings from the all

measures implemented at a site

– Test both load reduction & system efficiency measures because of different physics & DOE2.2r methods

– Sampling methodology & target• 10 sites in each of 3 size tiers for n = 30• 2 sites each tier with system measures

– Calculator is DOE2.2r which is transparent & accessible

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Remaining Items

• Level of detail to specify protocol inputs– Both site-specific & default inputs– Long list of required inputs with collection

procedures, libraries or defaults for each• Final write up of protocol, check list,

documentation

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Next StepsDate Item Intent

June 24, 2011

Circulate draft protocol and research plan for RTF comment

Subcommittee and RTF review of draft protocol & research plan with intent to finalize for August decision by RTF.

June 28, 2011

Update at full RTF Brief RTF on resolved & remaining issues. Prep for decision in August

July 6, 2011

Close of written comment Need time to digest comments and develop final

July 2011

At least one more subcommittee

To consider written comments and finalize proposed protocol and research plan

August RTF Meeting

Present to RTF Proposed Protocol and Research Plan with subcommittee recommendations for provisional status