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Q5. A vapour compression cycle using R12 has compressor suction and discharge of 3.626 bar 12.19 bar respectively. The vapour enters the compressor in a dry saturated state and leaves at a temperature of 67  The liquid refrigerant has 10 K of subcooling at the entry to the expansion value.

(a) Sketch ph and Ts diagrams. (2)

(b) Calculate EACH of the following.

(i) the dryness factor entering the evaporator. (3)

(ii) the specific work done. (5)

(iii) the coefficient of performance. (2)

(iv) the isentropic efficiency of the compressor. (4)