4. A two-stage cascade cooling system operates between the pressure limits of 1 and 0.1 MPa....

4. A two-stage cascade cooling system operates between the pressure limits of 1 and 0.1 MPa. Each stage operates on the ideal vapor compression cooling system and the refrigerant R-134a is used as working fluid. The heat transfer from the lower to the upper cycle takes place in an adiabatic reverse flow heat exchanger where both streams enter about 0.4 MPa. The refrigerant mass flow rate is 0.24 kg / s throughout the upper cycle.
a. sub-loop mass flow rate of refrigerant
b. heat extraction rate and compressor input power from chilled area
c. Determine the COP value.

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