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Q5. A vapour compression refrigeration cycle uses R124a as a refrigerant. The refrigerant enters the compressor at 1.0637 bar and -15℃, where it undergoes isentropic compression until it reaches 11. 595 bar.

The condenser undercools the refrigerant by 25 K.

a) Sketch the p-h and T-s graphs of the cycle. (4)

b) Determine the following points:

(i) the enthalpy and entropy at the compressor inlet. (2)

(ii) the temperature and enthalpy at the compressor outlet. (4)

(iii) the enthalpy and entropy at the evaporator inlet. (3)

(iv) coefficient of performance COP. (3)