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Cooling Tower Make-Up
Water Flow Rate Calculation

To calculate the make-up water flow rate, determine the evaporation rate using one of the following:

1. The evaporation rate is approximately 2 GPM per 1 million BTU/Hr of heat rejection.

2. The evaporation rate is approximately 3 GPM per 100 tons of refrigeration.

3. Evaporation Rate (GPM) = Water Flow Rate (GPM) x Range (°F) x 0.001.

Multiply the evaporation rate by the appropriate correction factor in the table below to calculate the make-up water flow rate, in GPM.

 

Cycles of
Concentration

Correction
Factor
2 2.00
3 1.50
4 1.33
5 1.25
6 1.20
7 1.17
8 1.14
9 1.13
10 1.11


 

 

 


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