A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35øC by rejecting waste heat to cooling water that enters the condenser at 18øC at a rate of 0.25 kg/s and leaves at 26øC. The refrigerant enters the condenser at 1.2 MPa and 50øC and leaves at the same pressure sub-cooled by 5øC. If the compressor consumes 3.3 kW of power, determine (a) The mass flow rate of the refrigerant, (b) The refrigeration load, (c) The COP, and (d) The minimum power input to the compressor for the same refrigeration load
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