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THE FEUTEX TOOLKIT

Counterflow Exchanger Effectiveness

Calculate counterflow effectiveness, duty and outlet temperatures from heat-capacity rates.

Thermal workspace● Runs in your browser
01 Your input
02 Your result
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Formulaε=(1−e^(−NTU(1−Cr)))/(1−Cr e^(−NTU(1−Cr))); equal-rate limit ε=NTU/(1+NTU).
Sources and model references

How to use this tool

  1. Enter every input in the labeled units; use measured or independently specified properties.
  2. Check the stated model assumptions before calculating.
  3. Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "ua": 2000,
  "hot": 2000,
  "cold": 1000,
  "thi": 100,
  "tci": 20
}

Accuracy and scope

Ideal counterflow with constant heat-capacity rates, no external heat loss or phase change. Outputs effectiveness and NTU; duty is εCmin(Thi−Tci). Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.