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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
Options:
A .  d²T/dZ² > 0
B .  d²T/dZ² = 0
C .  d²T/dZ² < 0
D .  dT/dZ = 0
Answer: Option B
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