LMTD for counter-flow and parallel flow heat exchanger will be the same, when the
A)Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
B)Outlet temperature of both the hot and cold fluid are same
C)Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid
D)None of these

Question

Quizplus · Accepted Answer

The Log Mean Temperature Difference (LMTD) for counter-flow and parallel flow heat exchangers will be the same when one of the fluids undergoes phase change at a constant temperature, such as when cold fluid is heated by condensing steam. This is because the temperature gradient between the hot and cold fluids remains constant along the length of the heat exchanger, making the LMTD independent of the flow arrangement.

LMTD for Counter-Flow and Parallel Flow Heat Exchanger Will Be