Two fluids A and B exchange heat in a counter current heat exchanger. Fluid A enters at 420°𝐶 and has a mass flow rate of 1 kg/s. Fluid B enters at 20°𝐶 and has a mass flow rate of 1 kg/s. Effectiveness of the heat exchanger is 75%. If the specific heat of fluid A is 1 kJ/kg K and that of fluid B is 4 kJ/kg K, then the heat transfer rate (Q) is:
A. 350 kJ
B. 330 kJ
C. 315 kJ
D. 300 kJ
Answer:D
Two fluids A and B exchange heat in a counter current heat exchanger. Fluid A enters at 420°𝐶 and has a mass flow rate of 1 kg/s. Fluid B enters at 20°𝐶 and has a mass flow rate of 1 kg/s. Effectiveness of the heat exchanger is 75%. If the specific heat of fluid A is 1 kJ/kg K and that of fluid B is 4 kJ/kg K, then the heat transfer rate (Q) is:
A. 350 kJ B. 330 kJ C. 315 kJ D. 300 kJ