Card 7 / 35: A countercurrent heat exchanger operates with the following temperatures: cold fluid inlet 20°C, hot fluid inlet 90°C. The heat capacity of the hot fluid is 2.2 kJ/kg K. The heat capacity of the cold fluid is 1 kJ/kg K. The flow rate of the hot fluid is 5 kg/s. The flow rate of the cold fluid is 66 kg/s. The area for heat transfer is 10 m2. The overall heat transfer coefficient is 2418 W/m2 K. What are the outlet temperatures?
A)
Thoto = 29.6° C, Tcoldo = 30.1°C
B)
Thoto = 29.6° C, Tcoldo = 40.1°C
C)
Thoto = 29.6 °C, Tcoldo = 50.1°C
D)
Thoto = 19.6° C, Tcoldo = 20.1°C
E)
Thoto = 39.6 °C, Tcoldo = 30.1°C
Answer:
A) Thoto = 29.6° C, Tcoldo = 30.1°C
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