cooling tower_makeup calculation.pdf
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Cooling Tower Make-up Water Flow Rate CalculationCooling Tower Make-up Water Flow Rate CalculationCooling Tower Make-up Water Flow Rate CalculationCooling 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 ofConcentration
Correction Factor
2 2.003 1.504 1.335 1.256 1.207 1.178 1.149 1.1310 1.11
Page 1 of 1USEFUL FORMULAS
18/10/2013http://www.gorhamschaffler.com/tower_makeup.htm
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