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Heat Exchanger NTU-Effectiveness Calculator

ε = 1 − e^(−NTU) — counterflow heat exchanger effectiveness.

Calculates NTU, heat transfer effectiveness, and actual heat duty for a counterflow heat exchanger from UA, flow rates, and fluid properties.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

NTU = UA/C_min; ε = 1−e^(−NTU(1+Cr))/(1+Cr) for C_r<1

In depth

Calculates NTU, heat transfer effectiveness, and actual heat duty for a counterflow heat exchanger from UA, flow rates, and fluid properties.