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Q6. A vapour compression refrigeration plant uses R134a and operates between pressures 1.0637 bar and 10.163 bar. The refrigerant enters the compressor at a temperature of -25℃ and leaves at a temperature of 55℃. The refrigerant leaves the condenser with 10 K subcooling. At These conditions the power input to the plant is 117 kW with a mechanical efficiency of 90 %.

(a) Sketch The cycle on pressure-specific enthalpy and Temperature-specific entropy diagrams. (4)

(b) Calculate EACH of the following:

(i) The isentropic efficiency of the compressor; (6)

(ii) The cooling load; (4)

(iii) The plant coefficient of performance. (2)