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Shaded Pole to ECM Retrofits in Walk In Evaporators

Regional Technical Forum March 2nd, 2009 Presented by: Jeremy Litow Ben Cartwright Scott Moore Portland Energy Conservation, Inc. Shaded Pole to ECM Retrofits in Walk In Evaporators. Summary Field staff: “savings too low” Reviewed base & eff. wattages Compared vs. real world data

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Shaded Pole to ECM Retrofits in Walk In Evaporators

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  1. Regional Technical ForumMarch 2nd, 2009Presented by: Jeremy LitowBen CartwrightScott MoorePortland Energy Conservation, Inc. PORTLAND ENERGY CONSERVATION, INC.

  2. Shaded Pole to ECM Retrofits in Walk In Evaporators • Summary • Field staff: “savings too low” • Reviewed base & eff. wattages • Compared vs. real world data • Revised savings

  3. Shaded Pole to ECM Retrofits in Walk In Evaporators • Issue • Current savings - 20 watt (1/40 hp) output too low for most walk in apps • Review and Research on motor data • Manufacturers data: Heatcraft and Bohn • Field Energy Analyst data collection and industry experience • Invoices from installed measure and audit data • Installed population & market potential • from audit and invoice data • Established ranges • hp mix (establishes wattage) • temp mix (establishes refrig. savings)

  4. Shaded Pole to ECM Retrofits in Walk In Evaporators • Findings • Manufacturers and Field Energy Analyst : most motors 49 watt (1/15 hp) in grocery apps • Wattage: 395 installed motors from 18 sites, as invoiced • 298 motors: 49 watt (1/15hp) (75%) • 97 motors: 16-23 watt (1/40 hp) (25%) • No 37 watt (1/20 hp), assumed @1 in 10 • No temps

  5. Shaded Pole to ECM Retrofits in Walk In Evaporators • Findings • Temperature – audit data • 1,348 recommended at sites where motors were installed in 299 Walk Ins at 82 sites • 69% medium temp (205) • 31% low temp (94) • 1162 motors installed (92% recco. qty) • Confident motors going where recommended • Market potential – audit data • 18,694 motors in 3,960 Walk Ins at 951 sites • 73% medium temp (2886) • 27% low temp (1074) • market penetration for audited stores: 6.5%

  6. Shaded Pole to ECM Retrofits in Walk In Evaporators • Results • Increased pre and post wattage based on market adoption and audit data using • Weighted blend of wattages, direct savings • 16-23 watt (25%), 37 watt (11.5%), 49 watt (63.5%) • Box temps, affects refrigeration savings • 69% Medium temp • 31% Low temp

  7. Shaded Pole to ECM Retrofits in Walk In Evaporators • Results • Old kWh based on 20 watt output for all motor sizes, all temps • 718 • New kWh based on weighted blend of motor wattages and box temps • 1093

  8. Shaded Pole to ECM Retrofits in Walk In Evaporators

  9. Shaded Pole to ECM Retrofits in Walk In Evaporators Questions?

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