A vapour compression plant uses R134a and has an evaporator pressure of 240 kPa and a condenser pressure of 1400 kPa. The vapour is dry saturated on entering the compressor and there is no undercooling of the condensate. The compression is carried out isentropically in two stages and a flash chamber is employed at an interstage pressure of 500 kPa. Calculate: (i) The amount of vapour bled off at the flash chamber; (ii) The state of the vapour at the inlet to the second stage of compression; (iii) The refrigerating effect per unit mass of refrigerant; (iv) The work done per unit mass of refrigerant; (v) the COP. A vapour compression plant uses R134a and has an evaporator pressure of 240 kPa and a condenser pressure of 1400 kPa. The vapour is dry saturated on entering the compressor and there is no undercooling of the condensate. The compression is carried out isentropically in two stages and a flash chamber is employed at an interstage pressure of 500 kPa. Calculate: (i) The amount of vapour bled off at the flash chamber; (ii) The state of the vapour at the inlet to the second stage of compression; (iii) The refrigerating effect per unit mass of refrigerant; (iv) The work done per unit mass of refrigerant; (v) the COP.