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For a counter current heat exchanger with Tih =` 80^circC`, `T^circ`c=` 60^circC`, `T^circ`h =` 50^circC` andTic = `30^circC`, 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 .  `(d^2T)/(dZ^2) > 0`
B .  `(d^2T)/(dZ^2) = 0`
C .  `(d^2T)/(dZ^2) < 0`
D .  `(dT)/(dZ) = 0`
Answer: Option B



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