For a counter current heat exchanger with Ti h = 80°C, T°c = 60°C, – McqOptions

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1.	For a counter current heat exchanger with Ti h = 80°C, T°c = 60°C, T°h = 50°C and Ti c = 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___________________?
A.	d2T/dZ2 > 0
B.	d2T/dZ2 = 0
C.	d2T/dZ2 < 0
D.	dT/dZ = 0
Answer» C. d2T/dZ2 < 0

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