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

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

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

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

11. 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.509-527-6211 LocationWalla Walla, WA 99362 Farm NameNice Cultivars

12. 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 / Load9/15/20065100%103,000Start fans when loading Cure / Suberize9/20/20065100%247,200 Continuous/Recirc if no OSA Ramp to Hold Temp9/25/200640100%2457,600Run Anytime OSA Avail Winter Holding11/4/200645100%2464,800Run Anytime OSA Avail Spring Holding12/19/200699100%24142,560Run Anytime OSA Avail Unload3/28/200715100%109,000 Continuous w/ OSA or Refrig empty4/12/20070100%00Run Anytime OSA Avail Storage Season Length 209 Total =284,160

13. 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 / Load9/15/2006570%101,249Start fans when loading Cure / Suberize9/20/200610100%2415,158 Continuous/Recirc if no OSA Ramp to Holding Temp9/30/20064090%2446,103Run Anytime OSA Avail Winter Holding11/9/20064570%2426,984Run Anytime OSA Avail Spring Holding12/24/20069080%2476,369Run Anytime OSA Avail Unload3/24/20071570%103,748 Continuous w/ OSA or Refrig empty4/8/200700%00Run Anytime OSA Avail Storage Season Length 205 Total =169,611

14. Estimating Savings Estimated Energy Savings114,549 Percent Energy Savings18%(range 10-30%) Energy Cost Savings$5,727.47 Estimated Project Cost$16,000.00($100-200/HP) Potential Incentive$9,600.00(may need to adjust formula) Payback w/o incentive (yr)2.8 Payback with incentive (yr)1.1

15. 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.

16. 43 VFD projects in Spud /Onion Sheds

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

18. 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

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

20. 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.

21. Questions? Tom Osborn 509-527-6211