Consider a refrigerator that operates on the vapor-compression refrigeration cycle with R-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 160 kPa,exits at 800 kPa and 50°C, and leaves the condenser as saturated liquid at 800 kPa. The coefficient of performance of this refrigerant is 2.6----1.0----4.2----3.2----4.4

Fig: 1

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