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Q12. A vapour compression refrigeration cycle uses R134a and operates between pressures of 1.6393 bar and 8.8672 bar. The refrigerant enters the compressor at a temperature of -10°C and leaves at a temperature of 50°C. It leaves the condenser as saturated liquid.

(a) Sketch the cycle on p-h and T-s diagrams.

(b) Calculate EACH of the following:

(i) The coefficient of performance of the cycle

(ii) The isentropic efficiency of the compressor.