Introduction

Log mean temperature difference (LMTD) in the logarithmic average between the hot and cold flows at each end of a heat exchanger. The LMTD is used in heat exchangers to determine the temperature driving force of heat transfer.

Calculations

⬇️ Inputs



THO
:70K



TCO
:25K



THI
:90K



TCI
:20K


⬆️ Outputs



LMTD
:57.1724203K


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Explanation

In counter flow heat exchangers the hot and cold fluids enter at opposite ends, and flow in opposing directions through the heat exchanger. This helps to maintain a large temperature difference between the hot and cold liquids throughout the length of the exchanger. Log mean temperature difference is is used to describe this difference using the following the equation.



Where:


Additional Resources

Check out our log mean temperature difference for parallel flow heat exchangers here!
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