Answer: A vapor-compression refrigeration system for a

Chapter 10, Problem 25P

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A vapor-compression refrigeration system for a household refrigerator has a refrigerating capacity of 1000 Btu/h. Refrigerant enters the evaporator at \(-10^{\circ} \mathrm{F}\) and exits at \(0^{\circ} \mathrm{F}\). The isentropic compressor efficiency is 80%. The refrigerant condenses at \(95^{\circ} \mathrm{F}\) and exits the condenser subcooled at \(90^{\circ} \mathrm{F}\). There are no significant pressure drops in the flows through the evaporator and condenser. Determine the evaporator and condenser pressures, each in \(\text { lbf/in. }{ }^{2}\), the mass flow rate of refrigerant, in lb/min, the compressor power input, in horsepower, and the coefficient of performance for (a) Refrigerant 134a and (b) propane as the working fluid.