Free Cooling Tower Calculator
Estimate the evaporation rate and makeup water requirement for a cooling tower.
Evaporation Rate
1.22 m^3/h
Evaporation Rate vs Circulation Flow Rate
Cooling Tower Water Balance
Cooling towers reject heat through evaporation, requiring continuous makeup water.
Formulas
Heat rejected = m_dot cp delta_T
Evaporation rate = 0.00085 x Circulation (m^3/h) x Range (deg C)
The 0.00085 factor is an approximation for the fraction evaporated per degree of cooling. Blowdown removes concentrated water to limit mineral buildup: Blowdown = Evaporation / (Cycles - 1)
Makeup = Evaporation + Blowdown
Example Calculation
50 L/s circulation, 8 deg C range, 4 cycles of concentration.
- 01Heat rejected = 50 x 4.18 x 8 = 1672 kW
- 02Circulation = 50 x 3.6 = 180 m^3/h
- 03Evaporation = 180 x 8 x 0.00085 = 1.224 m^3/h
- 04Blowdown = 1.224 / (4-1) = 0.408 m^3/h
- 05Makeup = 1.224 + 0.408 = 1.632 m^3/h
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