Variable Speed Pump Savings Calculator

Calculates energy savings from variable speed pump operation using affinity laws.

Motor nameplate HP.
HP
Annual hours at 100% speed.
hours
Percentage of full speed.
%
Annual hours at reduced speed.
hours
Cost per kWh.
$/kWh

Results

Full Speed Energy-kWh/year
VFD Energy-kWh/year
Annual Savings-$
References: DOE Motor Systems Tip Sheet, ASHRAE Applications