A vapour compression refrigeration plant using R134a operates with a compressor suction pressure and temperature of 2.006 bar and -10 \deg C. The condenser pressure is 7.675 bar and there is no undercoolingof the condensate. Compression takes place in two stages, and the condensate is throttled into a flash chamber at 4.1461 bar from which dry saturated vapour is drawn off to mix with the refrigerant from the L.P. compressor before entry to the H.P. compressor. The liquid from the flash chamber is throttled into the evaporator. Assuming isentropic compression in both compressors and neglecting all losses.Calculate i.ii.The coefficient of performance of the plantThe mass flow rate of refrigerant in the evaporator when the power input to the plant is 100 kW.