In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is
A)Minimum
B)Maximum
C)Zero
D)Infinity

Question

Quizplus · Accepted Answer

When the outlet temperatures of both hot and cold fluids are the same in a parallel flow heat exchanger, it implies that there is no temperature difference between the two fluids at the outlet. Since LMTD is a measure of the average temperature difference between the hot and cold fluids across the heat exchanger, if there is no temperature difference at any point (as is the case at the outlet in this scenario), the LMTD would be zero.

In a Parallel Flow Heat Exchanger, If the Outlet Temperature