A refrigerator uses refrigerant-134a as the working fluid and operates on the vapor-compression refrigeration cycle. The evaporator and condenser pressures are 200 kPa and 1400 kPa, respectively. The isentropic efficiency of the compressor is 88 percent. The refrigerant enters the compressor at a rate of 0.025 kg/s superheated by 10.1°C and leaves the condenser subcooled by 4.4°C. Determine

(a) The rate of cooling provided by the evaporator, the power input, and the COP.

(b) The same parameters if the cycle operated on the ideal vapor-compression refrigeration cycle between the same pressure limits.