In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?
Correct answer: D. Varies directly as the area and the LMTD
- A. None of these
- B. Directly proportional to LMTD and inversely proportional to the area
- C. Varies as square of the area
- D. Varies directly as the area and the LMTD
Explanation
For a heat exchanger, the heat-transfer rate is Q = UAΔTlm, so it increases directly with both heat-transfer area and the log mean temperature difference. The area is not in the denominator.
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