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A Carnot vapor refrigeration cycle is used to maintain a cold region at 0F when the ambient temperature is 70F. Refrigerant 134a enters the condenser as saturated vapor at 100 lbf/in.2 and leaves as saturated liquid at the same pressure. The evaporator pressure is 20 lbf/in.2 The mass flow rate of refrigerant is 12 lb/min. Calculate

(a) the compressor and turbine power, each in Btu/min.

(b) the coefficient of performance.

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An ideal vapor-compression refrigeration cycle operates at steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at 10C, and saturated liquid leaves the condenser at 28C. The mass flow rate of refrigerant is 5 kg/min. Determine

(a) the compressor power, in kW.

(b) the refrigerating capacity, in tons.

(c) the coefficient of performance.

Modify the cycle in Problem 8.39 to have saturated vapor entering the compressor at 1.6 bar and saturated liquid leaving the condenser at 9 bar. Answer the same questions for the modified cycle as in Problem 8.39.

 
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