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Q5) A vapour compression refrigeration system operates between the pressures of 4.625 bar and 8.053 bar.

R717 refrigerant enters the compressor dry saturated and is isentropically compressed. Upon leaving the condenser it is undercooled by 6 k. The mass flow rate is 0.8 .

(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)

(c) Explain the application of intermediate liquid cooling; (2)