⚡ Centrifugal Pump Affinity Laws (Power kW = [RPM2/RPM1]^3, 60% Pumping Cut)

Hydronic Pump VFD Affinity Laws Calculator

Model hydronic pumping power reductions using the Affinity Laws (Power is proportional to the cube of pump impeller speed: kW_2 = kW_1 x [RPM_2 / RPM_1]^3): calculate massive electrical energy savings (operating at 70% flow requires only 34% pump shaft power, cutting annual pumping bills by 55% to 65%), and VFD hydronic retrofit yields.

1. Project & Operating Inputs

Hydronic Pump Motor Rating (Horsepower - HP e.g. 50 HP Base-Mounted Pump)

Average Operating Speed (% of Full Speed e.g. 72.0% Average Speed)

Turnkey VFD Pump Drive Retrofit CapEx ($ e.g. $24,500)

Electricity Commercial Tariff ($ / kWh e.g. $0.145 / kWh)

2. Financial Breakdown & Yield

PUMP VFD AFFINITY LAWS (CUBE POWER)

5-Year Hydronic Pumping Electric Savings

Pump VFD Retrofit ROI

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost