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Evaluation of Energy Savings for Strip Curtains Presented To RTF Scott Moore PECI Sr. Engineer June 2, 2009 PowerPoint Presentation
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Evaluation of Energy Savings for Strip Curtains Presented To RTF Scott Moore PECI Sr. Engineer June 2, 2009. Presentation Overview. Justification for laboratory testing Methodology for laboratory tests Review test results Discuss potential annual savings and BC ratios

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Evaluation of Energy Savings for Strip CurtainsPresented To RTFScott MoorePECI Sr. EngineerJune 2, 2009

presentation overview
Presentation Overview
  • Justification for laboratory testing
  • Methodology for laboratory tests
  • Review test results
  • Discuss potential annual savings and BC ratios
  • Provide overview of current CPUC/ ADM Associates strip curtain evaluation
justification for laboratory testing
Justification For Laboratory Testing
  • All known savings results prior to 2007 were calculations based on ASHRAE infiltration formulas
  • BPA conducted field M&V testing in 2007
    • Pre and post strip curtain test runs
    • Inconsistent door open times between test runs
    • Energy data not normalized for weather or differences in length of defrost
    • Inconclusive results
    • BPA conducted field M&V testing in 2007
  • BPA and PECI concurred on laboratory testing to control variables
peci test overview
PECI Test Overview
  • Emerson Sidney, Ohio Test Laboratory
  • Separate Low and Medium temperature tests
  • 12 hour runs
    • Closed door
    • Open door with strip curtains
    • Open door without strip curtains
average medium temp run conditions
Average Medium Temp Run Conditions
  • 38F internal temperature
  • 74-75F D.B. / 61-63F W.B.
  • 79-80F condenser air inlet
  • 27.4 sq. ft door
  • Open door 4 minutes every 2 hours

Consistent with BPA for auto closer / gasket / strip tests

average low temp run conditions
Average Low Temp Run Conditions
  • -4F internal temperature
  • 75-77F D.B. / 53-54F W.B.
  • 80-82F condenser air inlet
  • 27.4 sq. ft door
  • Open door 4 minutes every 2 hours

Consistent with BPA for auto closer / gasket / strip tests

application of lab results for utility measure
Application of Lab results for Utility Measure
  • Unscaled

Variable = Door open time

  • Scaled

Variables = Door open time

Compressor system type and EER

Climate zone

annual energy savings sq ft opening unscaled
Annual Energy Savings / Sq. Ft. Opening(Unscaled)
  • Medium Temp:

0.8 hr open (48 minute lab test): 40 kWh

1 hr. open: 50 kWh

2 hr. open: 100 kWh

2.5 hr. open: 125 kWh

3 hr. open: 150 kWh

4 hr. open: 200 kWh

  • Low Temp:

0.8 hr. open: 182.5 kWh

1 hr. open: 228 kWh

2 hr. open: 456 kWh

2.5 hr. open: 570 kWh

3 hr. open: 684 kWh

4 hr open: 912 kWh

determination of potential scaled annual savings for bpa territory
Determination Of Potential Scaled Annual Savings For BPA Territory
  • Determine door open time standard
  • Adjust test results for system type, EER and annual outdoor ambient conditions
    • Multiplex system (FHP, FSP)
    • Single system (fixed head pressure)
    • Varying climate zones
    • Control systems
door open times
Door Open Times

Logged data from 2007-2008 BPA Field tests for walk in box strip curtains and auto door closures:

  • 18 logged boxes
  • Per day range: 0.6 hrs.- 5.8 hrs.
  • Per day average: 2.5 hours
final lab results weighting factors for northwest
Final Lab Results Weighting Factors for Northwest
  • Medium Temp: 77%*
  • Low Temp: 82%*

*Accounts for population of different compressor system types, EER’s and climate zones

potential savings
Potential Savings*
  • Medium Temp. Box Annual Savings:

kWh/sq.ft./hr * door open hours * weighting factor

= 50 * 2.5 * 0.77 = 96 kWh/sq. ft

  • Low Temp. Box Annual Savings:

kWh/sq.ft./hr * door open hours * weighting factor

= 228 * 2.5 * 0.82 = 467 kWh/sq. ft

* Based on 2.5 hr. open/day/365days/yr.

potential savings weighted by population of box type
Potential Savings (Weighted by population of box type)
  • PECI Grocer Smart ECM motor database
    • 73% Medium temp boxes
    • 27% Low temp boxes

96 kWh/sq. ft (med.) * 0.73 = 70.0 kWh

467 kWh/sq. ft. (low) * 0.27 = 126.0 kWh

= 196 kWh

Combined low/med weighted savings = 196 kWh/sq. ft.

bc ratio trc levelized cost input
BC Ratio / TRC Levelized Cost Input
  • $10.00 sq. ft. total 2008 installed cost
  • $9.55 sq. ft. total deflated installed cost
  • 4 year Measure Life
  • No annual maintenance
bc ratio trc levelized cost
BC Ratio / TRC Levelized Cost*

TypeB/C RatioTRC Levelized Cost

Med. 2.1 11.8

Low 10 -9.2

Combo 4.2 -1.5

*$10.00/ sq. ft. total install cost, deflated to $9.55/ sq. ft.

* 4 Year Measure Life

cpuc adm study
CPUC / ADM Study
  • ADM Associates is lead contractor for strip curtain study for the CPUC
  • ADM research concluded:
    • Previous savings numbers calculated by various state utilities
    • Previous work paper savings based on calculations using ASHRAE infiltration guidelines and formulas
    • No field M&V or logging of door open times
adm proposal for analysis
ADM Proposal For Analysis
  • Domain of study
    • Type of business
    • Type of refrigeration unit
    • Geographical location of site
  • Develop a site sample design
    • Paired study
    • With strip curtains
    • Without strip curtains
adm m v approach
ADM M&V Approach
  • Use statistical model
  • Conduct tracer gas measurements of air infiltration
  • Calculate loads based on refrigeration system weather dependant COP
  • Log system energy use
  • Conduct door monitoring with data loggers
    • Number of openings
    • Length of openings