Tom Osborn - BPA Results of Spud Onion Shed Efficiency Projects.

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Presentation transcript:

Tom Osborn - BPA Results of Spud Onion Shed Efficiency Projects

Discussion Topics What is a Spud Shed? Measurement & Verification Results. Request for approval of kWh savings per HP

Estimating Savings Spreadsheet tool Measure Fan or Pump kW 3 year billing history Load in / out dates

Estimating Savings Vendors using spreadsheet tool Measure Fan or Pump kW 3 year billing history Load in / out dates

Estimating Savings using spreadsheet Storage Capacity (ton)4,000 Storage Capacity (cwt)80,000 Design Airflow (cfm/ton)20 Total Fan HP80 Fan Motor Loading (est)90% Fan Motor Efficiency95% Calculated Fan Use (kW)56.5 VFD Efficiency95% Total Measured Fan (kW)60.0 Refrigerated (Yes/No)Yes Potato and Onion Storage VFD Analysis Project NameXYZ Potato Shed ContactOperator 1 Contact Phone No LocationWalla Walla, WA Farm NameNice Cultivars

Estimating Savings No VFD (Current) Ventilation System Profile Storage Phase Starting Dates Day s Fans In- Use Fan Run Time Calculated Usage Typical Fan Operation (%)(hr/day)(kWh) Harvest / Load9/15/ %103,000Start fans when loading Cure / Suberize9/20/ %247,200 Continuous/Recirc if no OSA Ramp to Hold Temp9/25/ %2457,600Run Anytime OSA Avail Winter Holding11/4/ %2464,800Run Anytime OSA Avail Spring Holding12/19/ %24142,560Run Anytime OSA Avail Unload3/28/ %109,000 Continuous w/ OSA or Refrig empty4/12/ %00Run Anytime OSA Avail Storage Season Length 209 Total =284,160

Estimating Savings Estimated VFD Ventilation System Operation Profile Storage Phase Starting Dates Day s Fan Speed Fan Run Time Calculated Usage Typical Fan Operation (%)(hr/day)(kWh) Harvest / Load9/15/ %101,249Start fans when loading Cure / Suberize9/20/ %2415,158 Continuous/Recirc if no OSA Ramp to Holding Temp9/30/ %2446,103Run Anytime OSA Avail Winter Holding11/9/ %2426,984Run Anytime OSA Avail Spring Holding12/24/ %2476,369Run Anytime OSA Avail Unload3/24/ %103,748 Continuous w/ OSA or Refrig empty4/8/200700%00Run Anytime OSA Avail Storage Season Length 205 Total =169,611

Estimating Savings Estimated Energy Savings114,549 Percent Energy Savings18%(range 10-30%) Energy Cost Savings$5, Estimated Project Cost$16,000.00($ /HP) Potential Incentive$9,600.00(may need to adjust formula) Payback w/o incentive (yr)2.8 Payback with incentive (yr)1.1

M&V Savings (results may vary) Monitor 6 months or an entire season. Use utility meter, sub meter, or VFD display data. Monthly records desirable.

43 VFD projects in Spud /Onion Sheds

Why Different Results? Crop Type Load in & Out Dates Tonnage Quality Crop Owner Storage Manager Storage type (w/ refrigeration?) Analysis Quality Drive Failure

Vendor Driven Program -Utilities explained program to vendors and shed operators. -Generally, suppliers of the shed control system market the utility program. e.g. -Suberizer -Custom Chemical -JMC Ventilation -Industrial Ventilation Inc

Results -43 projects or more! Average savings of 32% Average savings 1,255 kWh/HP Average Cost of $282 Average rebate claimed $129

Summary Spud Sheds with VFDs can be run more efficiently! Economics are good. Product quality can improve. Savings can vary, but average savings of 32%. BPA requests approval of savings/HP.

Questions? Tom Osborn