20141016IES_Nozzle Replacement_Usage Savings-1.docx

E1 = average annual kWh savings per nozzle
E2 = Flow rate of worn nozzle (6.41 gpm)
E3 = Average operating pressure with worn nozzles (45 psi)
E4 = Average pumping plant efficiency (60% or 0.6)
E5 = Flow rate of new nozzle (5.12 gpm)
E6 = Average operating pressure with new nozzles (50 psi)
E7 = Average number nozzles per line (33 nozzles)
E8 = Average annual operating hours (1,940)
E9 = Average number of nozzles per system (84 nozzles)
E10 = Number of nozzle replacements resulting in energy savings (67% or 0.67)
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