20141016IES_Custom Sprinkler Package_Usage Savings.docx

E1 = annual kWh savings for replacing the pivot package
E2 = Original pivot package flow rate (gpm)
E3 = Acres for full circle pivot
E4 = New pivot package flow rate (gpm)
E5 = Average operating pressure (68 psi)
E6 = Averagelift from water surface to pump (5 feet for surface pumps and 219 feet for well pumps)
E7 = Average pumping plant efficiency (65% or .65)
E8 = Savings realization factor (.8)
E9 = Average annual operating hours (1,158 hours)
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