⚙️ Fluid Mechanics (Affinity Laws: CFM proportional to RPM, SP proportional to RPM squared)

Fan Affinity Laws Calculator

Calculate dynamic operating point shifts for industrial centrifugal and axial fans using the fundamental Fan Affinity Laws when modulating VFD speed: calculate linear airflow scaling, quadratic pressure scaling, cubic power scaling, and VFD energy savings.

1. Project & Operating Inputs

Baseline Motor Power (BHP e.g. 100.0 BHP Full-Speed Load)

Reduced Operating Speed (% e.g. 80.0% Speed / 48 Hz Operation)

Annual Electricity Rate ($ / kWh e.g. $0.14 / kWh Industrial Rate)

Turnkey VFD Inverter Retrofit & Drive Commissioning Cost ($)

2. Financial Breakdown & Yield

FAN AFFINITY LAWS

Annual Fan VFD Energy Savings Profit

Energy Efficiency Engineering Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Direct Cost