solution


A counterflow heat exchanger operates at steady state with negligible kinetic and potential energy effects. In one stream, liquid water enters at 17 C and exits at 25 C with a negligible change in pressure. In the other stream, Refrigerant 134a enters at 14 bar, 80 C with a mass flow rate of 5 kg/min and exits as saturated liquid at 52 C. Heat transfer from the outer surface of the heat exchanger can be ignored. Determine

(a) the mass flow rate of the liquid water stream, in kg/min.

(b) the rate of entropy production within the heat exchanger, in kW/K.

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