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. This LMTD calculator is used specifically for heat exchangers operating in parallel flow.
Calculation
⬇️ Inputs
THO
:70K
TCO
:25K
THI
:90K
TCI
:20K⬆️ Outputs
LMTD
:56.5824961K
Explanation
In parallel flow heat exchangers the hot and cold fluids enter at the same end, and flow in the same direction to leave together at the other end of the exchanger. This means that the greatest temperature difference occurs as the fluids enter. This difference decreases along the length of the exchanger as heat is transferred between the fluids. 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 counterflow heat exchangers here!
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