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Q5. A vapour compression refrigeration system operates between the pressures of 2.465 bar and 4.295 bar.

R717 refrigerant enters the compressor dry saturated and is isentropically compressed. Upon leaving the condenser it is undercoated by 4 K. The mass flow rate is 687 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.

(ii,) the t1emperature leaving the compressor.

(iii) the compressor power.

(iv) the coefficient of performance.