Heat Transfer
For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy

dT/dZ = 0
d²T/dZ² < 0
d²T/dZ² > 0
d²T/dZ² = 0

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Heat Transfer
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

Constant temperature equal to that of the base
Temperature of the fin end
Average temperature of the fin
Surrounding temperature

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