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Q5) A vapour compression cycle using ammonia has compressor suction and discharge of 3.413 bar and 11.67 bar respectively.

The vapour enters the compressor in a dry saturated state and leaves at a temperature of 105℃. The liquid refrigerant has 4 K of subcooling at the entry to the expansion valve.

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

(b) Determine the following:

(i) The dryness factor entering the evaporator; (3)

(ii) The specific work done; (3)

(iii) The coefficient of performance; (2)

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