1 / 24

Grocery Store Issues

Grocery Store Issues. RTF April 10, 2007. Need Recommendations PECI: Energy Smart Grocer Program. Savings method for interactive measures Unitized savings using simplified methodology Load shapes for savings Measure lives Sub Committee to: Scope out evaluation plan & protocols

sari
Download Presentation

Grocery Store Issues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Grocery Store Issues RTF April 10, 2007

  2. Need RecommendationsPECI: Energy Smart Grocer Program • Savings method for interactive measures • Unitized savings using simplified methodology • Load shapes for savings • Measure lives • Sub Committee to: • Scope out evaluation plan & protocols • Design empirical testing for Auto-closer, Door Gasket, Strip Curtains

  3. Measure Savings • PECI calculator reviewed by Cascade Engineering and RTF sub committee • Eight recommendations for improvement • Seven adopted plus other improvements • Final Cascade recommendation to review • Some new measures not reviewed by Cascade • Review of savings for unitized measures

  4. Interactive Measures • Segue to slides from PECI • PECIInteractiveAdjust.ppt

  5. Unitized Savings • 36 Measures with simplified unit savings • Savings derived from calculations • Used for measures with relatively consistent savings • Little value to model savings • Savings per unit and number of units • Example: kWh / linear foot case * linear feet case • Methods reviewed by Cascade Engineering & RTF staff • Comparative analysis in: ESG Measures.xls\Measures

  6. Unitized Savings Issues • Savings for anti-sweat heaters in medium temp • Assumptions for door auto-closer savings • Savings & methodology for door gaskets • Assumptions and methods for strip curtains • Review comparative analysis in: • ESG Measures.xls\Measures

  7. Unitized Savings: Anti-Sweat Heater Control • Turn off resistance heaters when not needed • Humidity or timer control • Compared PECI savings estimates to BPA findings on NRM installations • Comparable for low-temp cases • PECI savings low for medium temp (46 versus 330 kWh per year per linear foot case) • Post-install duty cycle differences

  8. Unitized Savings: Auto Closers • Assures door gets closed if left open or ajar • Door intentionally open 3 hours per day (1095/year) • Ajar 25% of remaining hours (1915/year) • Savings based on closing door these hours • Heat loss by ASHRAE Open Door Method • Effective opening approx 3 to 4 inch opening • No comprehensive data on door openings • BPA data on two cafeteria walk-ins show much lower opening times (one hour/day & .29 hour/day)

  9. Unitized Savings: Gaskets • Damaged gaskets = infiltration • Hours 8760 minus open time minus ajar time • 5750 hours for gasket savings • Gasket prevents 2% of open door heat loss • ASHRAE Open Door (2006 Chap 13.4 equation 12) • PECI revised savings downward 12-25% • Ambient conditions, door size, effectiveness • Savings now maximum of 2% of case load

  10. Unitized Savings: Strip Curtains • No savings in BPA program due to uncertainty • Monitored data on one store showed increase energy use • Evaluate first • PECI Method: • ASHRAE Open Door Heat Loss • 80 percent effective • Door open hours: Survey or default (0.4, 0.8, 1.2 hrs/day) • Issues: • Is door left open longer due to curtains? • Longevity of curtains

  11. Load Shape for Savings • Need shape for cost-effectiveness analysis • Few previously-existing shapes for refrigeration • Proposal: Six new shapes • Developed by engineering assumptions, DOE2.2R refrigeration runs, and some metered data • Reviewed by NRM, PECI, kW Engineering

  12. Refrigeration Load Shapes • GrocRefLoad • GrocRefUnLoad • GrocFloatHeadAir • GrocFloatHeadEvap • GrocNightCover • GrocAutoCloser • GrocDoorGasket See Grocery Shapes.xls for map of measures & corresponding load shapes and derivation of shapes

  13. Time Segments

  14. Flat Load

  15. GrocRefLoad • Follows shape of refrigeration load • Responds to ambient conditions at heat sink • Based on DOE2 model runs for 8760 hours • Tested impact of climate (Boise & Seattle) • Tested impact of heat sink (Air & Water Cooled) • Tested control type (Fixed & Floating Head) • Result: • Total savings change with factors • But shape of load remarkably similar • Proposal: Simple average of 8 cases

  16. GrocRefLoad Link to excel

  17. GrocRefUnLoad • Shape is opposite refrigeration load • Savings occur when refrigeration load is reduced • Unloading compressors or condenser fans with VSD or floating suction • Turn off walk-in evap fans when compressor is off • Shape derived from compressor cycling data

  18. GrocRefUnLoad

  19. GrocFloatHead • Floating head pressure control • Source DOE2 runs • Average for climate, system type & heat sink • Similar to GroceryUnLoad, but steeper • Small savings in summer • Little difference by climate • Significant difference Air-Cooled versus Evap-Cooled • Proposal: Two shapes Air-Cooled & Evap Cooled

  20. GrocFloatHead

  21. New Load Shapes (3) • GrocNightCover • GrocAutoCloser • GrocDoorGasket

  22. Measure Lives • Gaskets 4 • Night Covers 5 • Auto-closers 8 • Anti-Sweat Heater Control (8 or 12?) • ECM Motors (12 or 15?) • New Efficient cases 12 • Condensers 10 • VFD Refrig Motor 10 • Multiplex systems 15 • Floating Head Systems 16 • Case Lighting (12 or 16?) For Details: ESG Measures.xls

  23. Need RecommendationsPECI: Energy Smart Grocer Program • Savings method for interactive measures • Unitized savings using simplified methodology • Load shapes for savings • Measure lives • Sub Committee to: • Scope out evaluation plan & protocols • Design empirical testing for Auto-closer, Door Gasket, Strip Curtains

More Related