Plant engineering calculator · Updated 17 September 2026
Cooling Tower Evaporation Loss Calculator — Heat Rejection & Water Loss
Estimate evaporation from circulation/range or measured heat rejection, and show annual water loss with an explicit latent-heat assumption.
Inputs
Live results
- Heat rejection 5,802.2611 kW
- Evaporation 8.5428571 m³/h
- Evaporation fraction 0.85428571%
- Annual evaporation 51,257.143 m³
Formula
E≈Qreject/hfg; Q≈ṁwater·Cp·range.
Worked example
1,000 m³/h water cooled by 5 K rejects about 5.8 MW and evaporates roughly 9.4 m³/h at hfg=2,450 kJ/kg.
Assumptions and limits
- Neglects sensible heat transfer to air in the simple heat-balance estimate.
- Use site water temperature for density and latent heat when precision matters.
FAQs
What does this Cooling Tower Evaporation Loss Calculator calculate?
Estimate evaporation from circulation/range or measured heat rejection, and show annual water loss with an explicit latent-heat assumption.
What should I verify before final design?
Verify measured operating data, fluid properties, equipment curves, safety margins and the applicable OEM or engineering standard.
Why are intermediate results shown?
They expose assumptions and make unit, load and operating-condition errors easier to catch.