GATE ME 2014 Set 2 — Question 26
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Heat Transfer → Heat Exchangers → Parallel, Counter & Cross Flow
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Question
In a heat exchanger, it is observed that , where is the temperature difference between the two single phase fluid streams at one end and is the temperature difference at the other end. This heat exchanger is
Correct answer
(C) a counter flow heat exchanger
Solution
In a counter-flow heat exchanger, the temperature difference between the hot and cold fluids is given by . If the heat capacity rates of both fluids are equal (), then the temperature profiles are parallel, and the temperature difference remains constant throughout the heat exchanger. Thus, . For parallel flow, the temperature difference always decreases along the length. For condensers and evaporators, one fluid temperature is constant, but typically varies unless it's a specific counter-flow case with balanced capacities.
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