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Q11. A vapour compression refrigeration cycle operating between pressures of 2.006 bar and 10.163 bar is to be used as a heat pump supplying a heating load of 10 kW.

The working fluid is R134a which enters the compressor as a dry saturated vapour and leaves at a temperature of 50ºC. The liquid enters the expansion valve with 5 K of sub-cooling.

(a) Sketch the cycle on p-h and T-s diagrams.

(b) Determine EACH of the following:

(i) The mass flow of refrigerant required

(ii) The cooling load based on the mass flow obtained Q6 b (i)

(iii) The heat pump co-efficient of performance

(iv) The isentropic efficiency of the compressor.