Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at 2358c by rejecting waste heat to cooling water that enters the condenser at 188c at a rate of 0.25 kg/s and leaves at 268c. the refrigerant enters the condenser at 1.2 mpa and 508c and leaves at the same pressure subcooled by 58c. 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

d) the minimum power input to the compressor for the same refrigeration load