How does the Heat Exchanger Calculator work?

Calculate: Q = U×A×ΔT_lm (log mean temperature difference) Then: Account for flow arrangement (counterflow, cross-flow, parallel) Then: Size area for required heat transfer.

Can you give an example of how to use the Heat Exchanger Calculator?

Example: Input Q = 50 kW, U = 2000 W/m²·K, ΔT_lm = 10 K gives a result of A ≈ 2.5 m² required (Determines exchanger size).

Is the Heat Exchanger Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Heat Exchanger Calculator?

Our Heat Exchanger Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Heat Exchanger Calculator

Heat Exchanger LMTD Calculator

Hot Inlet (°F)

Hot Outlet (°F)

Cold Inlet (°F)

Cold Outlet (°F)

Heat exchanger effectiveness and sizing depend on flow rates, temperatures, and heat transfer area. Design ensures adequate thermal transfer.

Symbol	Name	Unit	Description
Q	U×A×ΔT_lm (log mean temperature difference)	—	U×A×ΔT_lm (log mean temperature difference)
U	U value	—	Variable used in the calculation
A	A value	—	Variable used in the calculation

Difficulty:advanced

References

›Heat Exchanger — Wikipedia

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Heat Exchanger Calculator

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Heat Exchanger LMTD Calculator