Engineering CalculationCooling Tower Efficiency Calculator - Range, Approach, Effectiveness
Check how well a cooling tower is working from its water inlet, outlet and wet bulb temperatures, and find evaporation loss and make-up water.
Open the calculator →Formula
Range = Tin − Tout; Approach = Tout − Twb
Effectiveness = Range / (Range + Approach) × 100
Evaporation loss (m³/h) = 0.00085 × 1.8 × circulation (m³/h) × Range (°C)
Worked example
Inlet 40 °C, outlet 32 °C, wet bulb 28 °C, circulation 1,000 m³/h
Range = 8 °C, Approach = 4 °C, Effectiveness = 66.7 %, Evaporation = 12.24 m³/h
Where engineers use it
- Utility performance monitoring
- Energy audits
- Make-up water and blowdown planning
How to use
- Click Open the calculator. It runs free in your browser, on desktop or phone.
- Enter your values. Units and typical ranges are shown next to each input.
- Read the result and the step-by-step working, then print or add it to your Project BOQ.
Questions
Is there a test report format?
Yes, the Mechanical suite has a Cooling Tower Performance Test report.