⚡ Fan Affinity Law (Fan kW = kW x [RPM/RPM_full]³), Wet-Bulb Approach Tracking

Cooling Tower VFD Fan Energy Savings Calculator

Model variable frequency drive (VFD) retrofits on commercial cooling tower fan motors using Fan Affinity Laws: calculate cubed-power reduction (running at 80% fan speed consumes only 51% full-load kW; running at 50% speed consumes only 12.5% kW), automatic leaving water temperature setpoint tracking, and utility rebate ROI.

1. Project & Operating Inputs

Cooling Tower Fan Motors (Horsepower - HP e.g. 4x 40 HP Motors = 160 HP)

Annual Operating Hours (Hours / Year e.g. 4,500 Operating Hrs/Yr)

Turnkey Invoiced VFD Retrofit CapEx ($ e.g. $38,000)

Facility Electricity Rate ($ / kWh e.g. $0.15/kWh)

2. Financial Breakdown & Yield

COOLING TOWER VFD FAN AFFINITY

5-Year Commercial Electricity Bill Savings

Cooling Tower VFD Retrofit ROI

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost