Heat Exchanger Effectiveness Calculator

Effectiveness compares actual heat transfer with the maximum possible.

HVAC Pro calculator — inputs, formula and example are open to everyone.

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Formula

ε = (Tc,out − Tc,in) ÷ (Th,in − Tc,in)

Example calculation

Hot in 180 °F, cold in 60 °F, cold out 150 °F → 75%.

Practical HVAC use

HRV/ERV and plate exchanger performance.

Common mistakes

Using the formula when the hot side has the smaller capacity rate.

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Educational tool. Results are estimates from the stated formulas; always confirm with manufacturer data and the code adopted in your jurisdiction. All calculators