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THE FEUTEX TOOLKIT

Heat Exchanger LMTD Duty

Estimate thermal duty from terminal temperature differences and overall conductance.

Thermal workspace● Runs in your browser
01 Your input
02 Your result
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FormulaΔTlm=(ΔT₁−ΔT₂)/ln(ΔT₁/ΔT₂); Q=UAFΔTlm.
Sources and model references

Worked example

Inputs

First terminal temperature difference
60 K
Second terminal temperature difference
30 K
Overall coefficient
500 W/(m²·K)
Heat transfer area
10 m²
Configuration correction factor
1

Expected results

Log-mean temperature difference
43.28085123 K
Heat duty
216404.2561 W

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

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

{
  "dt1": 60,
  "dt2": 30,
  "u": 500,
  "area": 10,
  "correction": 1
}

Accuracy and scope

Terminal differences must correspond to the actual flow arrangement; no temperature crossing or phase-property lookup. 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.