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  1. For a heat exchanger, ∆Tmax is the maximum temperature difference and ∆Tmin is the minimum temperature difference between the two fluids. LMTD is the log mean temperature difference. Cmin and Cmax are the minimum and the maximum heat capacity rates. The maximum possible heat transfer (Qmax) between the two fluids is
    1. Cmin LMTD
    2. Cmin ∆Tmax
    3. Cmax ∆Tmax
    4. Cmax ∆Tmin
Correct Option: B

The temperature difference is not for a given fluid but across the fluids and maximum heat transfer occurs for Cmin and the temperature difference is equal to (Thi - Tci )

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