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
A. $$\frac{{{{\text{d}}^2}{\text{T}}}}{{{\text{d}}{{\text{Z}}^2}}} > 0$$
B. $$\frac{{{{\text{d}}^2}{\text{T}}}}{{{\text{d}}{{\text{Z}}^2}}} = 0$$
C. $$\frac{{{{\text{d}}^2}{\text{T}}}}{{{\text{d}}{{\text{Z}}^2}}} < 0$$
D. $$\frac{{{\text{dT}}}}{{{\text{dZ}}}} = 0$$
Answer: Option B
This Question Belongs to Chemical Engineering >> Heat Transfer
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