6-101 A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure sub- cooled by 5°C. If the compressor consumes 3.3 kW of power, determine (a) the mass flow rate of the refriger- ant, (b) the refrigeration load, (c) the COP, and (d) the minimum power input to the compressor for the same refrigeration load. Water 26°C 18°C 1.2 MPa 50°C 1.2 MPa 5°C subcooled Expansion valve Condenser Evaporator Compressor QL 000 W in