In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?

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In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?

A. Varies directly as the area and the LMTD
B. Directly proportional to LMTD and inversely proportional to the area
C. Varies as square of the area
D. None of these