Cooling Tower Calculator

Cooling Tower Operating Conditions

Hot Water Temp Entering Tower (°F)

Cold Water Temp Leaving Tower (°F)

Entering Wet-Bulb Temp (°F)

Circulation Flow Rate (GPM)

Cycles of Concentration

Drift Loss (%)

Cooling Tower Performance

Cooling Range

—

°F

Approach

—

°F (CWT − WBT)

Heat Rejected

—

Cooling Tons

Heat Rejected

—

MBH

Water Balance & Make-Up Requirements

Evaporation

—

GPM

Drift Loss

—

GPM

Blowdown

—

GPM

Total Make-Up

—

GPM

Evaporation = 0.85% of flow per 10°F range (approx). Blowdown = Evaporation / (CoC − 1). Make-up = Evaporation + Drift + Blowdown. Actual values depend on tower design, fill type, and ambient conditions.

Do the full calculation in AIM Works

This calculator handles one step. AIM Works runs the complete MEP design workflow — thermal load calculations, duct & pipe networks, equipment selection, code compliance, and an AI design assistant — in one tool.

✓ ASHRAE 62.1 ventilation + CLTD/CLF/RTS load methods

✓ Darcy-Weisbach pipe & duct network solvers

✓ ASHRAE 90.1 / IMC / NFPA compliance checks

✓ 20 free AI design messages included in trial