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Q5) A vapour compression refrigeration system operates between the pressures of 4.233 bar and 9.607 bar.

R12 refrigerant enters the compressor dry saturated and is isentropically compressed. Upon leaving the condenser it is undercooled by 10 K. The mass flow rate is 1867  kg/hour.

(a) Sketch the cycle on pressure – specific enthalpy and temperature – specific entropy diagrams. (2)

(b) Calculate EACH of the following:

(i) the dryness fraction of the refrigerant entering the evaporator; (3)

(ii) the temperature leaving the compressor; (5)

(iii) the compressor power; (4)

(iv) the coefficient of performance. (2)