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Discussion :: Heat and Mass Transfer

  1. A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

  2. A.

     20°C

    B.

     40°C

    C.

     60°C

    D.

     66.7°C

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    Answer : Option A

    Explanation :

    tm = mean temperature difference between the two fluids for counter flow heat exchanger,
    tm = th1-tc2 = th2-tc1.
    tm = th2-tc1 = 60-40 = 20.


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