LMTD Heat Exchanger Calculator

Calculate heat exchanger duty, overall heat transfer coefficient or area using LMTD. Compare parallel and counter flow with a correction factor.

1. Choose what to calculate

What do you want to calculate?

Heat transfer rate (Q) Overall heat transfer coefficient (U) Effective heat transfer area (Aꜱ)

Flow configuration

Parallel flow Counter flow

Parallel: fluids move in the same direction. Counter: fluids move in opposite directions.

Temperatures

Input units: °C / K / °F. Each input uses its selected unit; changing units converts values automatically.

Hot fluid inlet temperature (T₁,in)

Hot fluid outlet temperature (T₁,out)

Cold fluid inlet temperature (T₂,in)

Cold fluid outlet temperature (T₂,out)

Material and geometry

Correction factor (F)

Use 1 for an ideal parallel or counter-flow exchanger. Other correction factors must be greater than 0 and at most 1.

Overall heat transfer coefficient (U)

Effective heat transfer area (Aꜱ)

Heat transfer

Enter the temperatures at each end of the selected flow arrangement. All area and coefficient values must be positive.

Resets fields and units to their defaults. Saved calculations remain.