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Pump / Fan VFD Energy Savings (Affinity Laws)

Estimates the energy and cost savings of switching a centrifugal pump or fan from throttled flow control to VFD speed control, using the standard cubic affinity law.

AAJappsEngineering Calculation Report

Pump / Fan VFD Energy Savings

Centrifugal-load affinity laws (flow ∝ speed, power ∝ speed³)

Generated

For preliminary engineering use only — always verify results against project-specific standards and a qualified engineer's review before use in a real design.

Motor & operating point

kW
%
% of rated

Economics

hr/yr
/kWh

Savings estimate

Flow fraction70%
VFD power at this flow25.72 kW
Throttled baseline power75.00 kW
Power savings49.28 kW
Annual energy savings295,650 kWh
Annual cost savings$35,478.00