Log Mean Temperature Difference - Heat Transfer

Heat Transfer Engineering
Thermodynamics

In heat exchanger applications, the inlet and outlet temperatures are commonly specified base on the fluid in the tubes. The temperature change that takes place across the heat exchanger from the entrance to the exit is not linear. A precise temperature change between two fluids across the heat exchanger is best represented by the log mean temperature difference (LMTD or DTlm), defined below .

log mean temperature difference

Temperature Change