20141016IES_Custom Sprinkler Package_Demand Savings.docx

D1 = kW savings for replacing the pivot package
D2 = Original pivot package flow rate (gpm)
D3 = Acres for full circle pivot
D4 = New pivot package flow rate (gpm)
D5 = Average operating pressure (68 psi)
D6 = Average lift from water surface to pump (5 feet for surface pumps and 219 feet for well pumps)
D7 = Average pumping plant efficiency (65% or 0.65)
D8 = Savings realization factor (0.8)
D9 = factor to average demand savings from the irrigation season over the entire year (5/12)
Equation Constants
Conversion factor from psi to feet of head = 2.31
Conversion factor from hp to kW = 0.746
Units conversion factor for water horsepower calculation = 3,960
Assumed increase in pivot flow rate due to wear = 1 gpm/acre