Cooling Tower Calculator
Calculate cooling range, approach, Merkel number, evaporation rate, and makeup water requirements for cooling tower design.
Inputs
m³/hr
°C
°C
°C
m³/hr
Results
Cooling Range
10 °C
Cooling Approach
5 °C
Merkel Number (KaV/L)1.88
Evaporation Rate5 m³/hr
Makeup Water Required7.17 m³/hr
How to Use This Calculator
- Enter the Water Flow Rate in m³/hr — the total circulating water flow through the tower.
- Enter the Hot Water Temperature in °C entering the tower and the Cold Water Temperature in °C leaving it. The difference is the Cooling Range.
- Enter the Wet Bulb Temperature in °C of the ambient air — this sets the thermodynamic limit. The Approach is how close cold water gets to wet bulb.
- Enter the Air Flow Rate in m³/hr through the tower fills.
- Review the Merkel Number (KaV/L) — a higher value indicates more efficient mass transfer and a better-performing tower.
- Note the Evaporation Rate and Makeup Water Required in m³/hr for water consumption planning and blowdown calculations.
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