1. Dairy Milking Machine Vacuum Pump VFD Savings Calculator Follow-up from the last RTF meeting with more field data Regional Technical Forum December 7, 2010

2. Overview How the RTF calculator works – Baseline Annual Energy Consumption = 0.75 * motor nameplate hp * 0.746 * hours of operation per day * 365 – Retrofit Energy Consumption = Baseline Energy Consumption * 0.50 – Metered baseline or retrofit energy consumption data can be used to override the default calculations. At the November 2 nd, 2010 RTF meeting – The RTF voted to approve the continued use of the Dairy Vacuum Pump VFD calculator, until better data were available. – Chris Helmers offered that PacifiCorp has new data. The group agreed that the RTF should look at PacifiCorp’s data set to ensure the calculator is providing reasonable results on the entire sample. Since the meeting – Hours of operation and metered pre/post metered use data from an additional 82 dairies shows calculator provides reasonable, if conservative, results. Thank you PacifiCorp and EMP2 for the data Not all sites had both pre and post metered energy use data available Summary of comparison of Calculated-to-Measured – Calculated baseline energy consumption usually lower than measured – Calculated retrofit energy consumption usually higher than measured – Calculated energy savings usually lower than measured The remaining slides provide a summary of the data Recommendation: Continue allowing use of the RTF calculator until detailed data are available from the Farm Energy Pilot Program to make improvements to the calculator (estimated late 2011). 2

3. Notes – Measured baseline data for WA sites probably includes other loads (whole-facility?) – Overall, calculator gives a result 16.5% lower than measured (not including WA sites). 3

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5. Notes – Overall, calculator gives a result 23% greater than measured. 5

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7. Notes – Overall, calculator gives a results 31% lower than measured. 7

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