For a counter current heat exchanger with Ti h = 80C, Tc = 60C, Th = 50C and Ti c = 30C, 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___________________?
A. dT/dZ = 0
B. d2T/dZ2 = 0
C. d2T/dZ2 < 0
D. d2T/dZ2 > 0
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