LMTD for counter-flow and parallel flow heat exchanger will be the same, when the_________________?
Correct answer: D. Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
- A. None of these
- 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. Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
Explanation
When one fluid condenses, its temperature remains essentially constant, so the terminal temperature differences are the same arrangement-wise in parallel and counter-flow operation. Consequently, both arrangements have the same LMTD in this case.
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