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Q8. In a vapour compression refrigeration plant using refrigerant R134a, the refrigerant enters the compressor at a pressure of 1.0637 bar and after isentropic compression Leaves at a pressure and temperature of 7.7 bar 50°C respectively.

The refrigerant leaves the condenser at the rate of 20 kg/min with 5 K of sub-cooling.

(a) Sketch the cycle on EACH of the following:

(i) A p-h diagram indicating the refrigeration effect, compressor work and condenser heat rejection

(ii) A T-s diagram, indicating superheat and sub-cooling.

(b) Determine EACH of the following:

(i) The condition of the refrigerant at the compressor suction

(ii) The compressor power required

(iii) The heat rejection in the condenser

(iv) The coefficient of performance.