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1. Refrigerant 134a enters the compressor of an ideal vapor-compression refrigeration cycle as saturated vapor at 2108F. The condenser pressure is 160 lbf/in.2 The mass flow rate of refrigerant is 6 lb/min. Plot the coefficient of performance and the refrigerating capacity, in tons, versus the condenser exit temperature ranging from the saturation temperature at 160 lbf/in.2 to 908F.
2. To determine the effect of changing the evaporator temperature on the performance of an ideal vapor- compression refrigeration cycle, plot the coefficient of performance and the refrigerating capacity, in tons, for the cycle in Problem 10.11 for saturated vapor entering the compressor at temperatures ranging from 240 to 2108C. All other conditions are the same as in Problem 1.
Refrigerant-134a at 1 MPa and 100°C is throttled to a pressure of 0.8 MPa. Determine the reversible work and exergy destroyed during this throttling process. Assume the surroundings to be at 30°C.
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