1. A vapour compression refrigeration system operates between the pressures of 2.68 bar and 10.34 bar. It produces 2 tonnes/hour of ice at -8°C from water at 25°C. The ammonia

refrigerant enters the compressor at a temperature of 13°C. It leaves the compressor with 100 K superheat. The mass flow rate is 750 kg/hour. a. Calculate EACH of the following i. The dryness fraction of the refrigerant entering the evaporator ii. The degree of undercooling in the condenser iii. The compressor power iv. The coefficient of performance. b. Sketch the cycle on pressure-specific enthalpy and Temperature-specific entropy diagrams.