20141016IES_Nozzle Replacement_Demand Savings.docx

D1 = kW savings per nozzle
D2 = Flow rate of worn nozzle (6.41 gpm)
D3 = Average operating pressure with worn nozzles (45 psi)
D4 = Average pumping plant efficiency (60% or 0.6)
D5 = Flow rate of new nozzle (5.12 gpm)
D6 = Average operating pressure with new nozzles (50 psi)
D7 = Average number nozzles per line (33 nozzles)
D8 = Average number of nozzles per system (84 nozzles)
D9 = Number of nozzle replacements resulting in energy savings (67% or 0.67)
D10 = 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