R134A fluid is used in a two-stage cascade cooling system. The system operates between 0.5 MPa and 1.3 MPa. The stage pressure at which the heat released from the lower cycle is transferred to the upper cycle is 0.7MPa. The heat exchanger used between stages is an adiabatic and counter flow heat exchanger. Since the R134a flow rate used in the lower stage is 0.1 kg/s and both cycle stages work as an ideal vapor compression refrigeration cycle; a) Draw the operating diagram and T-s diagram of the system. b) Find the COP values of the lower stage, upper stage and cascade system separately. c) Find the compressor work gain obtained by using the cascade system. d) Find the cooling capacity increase in the system. e) Find the refrigerant flow rate used in the upper stage.