A refrigerator uses refrigerant-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. The refrigerant enters the evaporator at 120 kPa with a quality of 30 percent and leaves the compressor at 60 deg C. If the compressor consumes 450 W of power, determine:

a. the mass flow rate of the refrigerant,

b. the condenser pressure, and

c. the COP of the refrigerator.