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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 HP 80
Fan Motor Loading (est) 90%
Fan Motor Efficiency 95%
Calculated Fan Use (kW) 56.5
VFD Efficiency 95%
Total Measured Fan (kW) 60.0
Refrigerated (Yes/No) Yes
Potato and Onion Storage VFD AnalysisProject Name XYZ Potato Shed
Contact Operator 1
Contact Phone No. 509-527-6211
Location Walla Walla, WA 99362
Farm Name Nice Cultivars
Estimating Savings
No VFD (Current) Ventilation System Profile
Storage PhaseStarting Dates
Days
Fans In-Use
Fan Run Time
Calculated Usage Typical Fan Operation
(%) (hr/day) (kWh)
Harvest / Load 9/15/2006 5 100% 10 3,000 Start fans when loading
Cure / Suberize 9/20/2006 5 100% 24 7,200Continuous/Recirc if no OSA
Ramp to Hold Temp 9/25/2006 40 100% 24 57,600 Run Anytime OSA Avail
Winter Holding 11/4/2006 45 100% 24 64,800 Run Anytime OSA Avail
Spring Holding 12/19/2006 99 100% 24 142,560 Run Anytime OSA Avail
Unload 3/28/2007 15 100% 10 9,000Continuous w/ OSA or Refrig
empty 4/12/2007 0 100% 0 0 Run Anytime OSA Avail
Storage Season Length 209 Total = 284,160
Estimating Savings Estimated VFD Ventilation System Operation Profile
Storage PhaseStarting Dates
Days
Fan Speed
Fan Run Time
Calculated Usage Typical Fan Operation
(%) (hr/day) (kWh)
Harvest / Load 9/15/2006 5 70% 10 1,249 Start fans when loading
Cure / Suberize 9/20/2006 10 100% 24 15,158Continuous/Recirc if no OSA
Ramp to Holding Temp 9/30/2006 40 90% 24 46,103 Run Anytime OSA Avail
Winter Holding 11/9/2006 45 70% 24 26,984 Run Anytime OSA Avail
Spring Holding 12/24/2006 90 80% 24 76,369 Run Anytime OSA Avail
Unload 3/24/2007 15 70% 10 3,748Continuous w/ OSA or Refrig
empty 4/8/2007 0 0% 0 0 Run Anytime OSA Avail
Storage Season Length 205 Total = 169,611
Estimating Savings
Estimated Energy Savings 114,549
Percent Energy Savings 18% (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
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
Spud Shed Savings Percentage
-40%
-20%
0%
20%
40%
60%
80%
100%
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
Why Different Results?
Crop TypeLoad in & Out Dates
TonnageQuality
Crop OwnerStorage 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.
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