For a counter current

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For a counter current heat exchanger with Tⁱ_h =` 80^circC`, `T^circ`_c=` 60^circC`, `T^circ`_h =` 50^circC` andTⁱ_c = `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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