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A two-stage cascade refrigeration system is shown below. The refrigerant is R134a. It consists of two...

A two-stage cascade refrigeration system is shown below. The refrigerant is R134a. It consists of two ideal vapor-compression cycles with heat exchange between the condenser of the lowertemperature cycle and the evaporator of the higher-temperature cycle. The hotter cycle operates between 0.7 MPa and 0.35 MPa, while the cooler cycle operates between 0.35 MPa and 0.12 MPa. If the flow rate in the hotter cycle is 0.5 mol/s, determine the following:

What is the flow rate in the cooler cycle? (b) What is the rate of heat removal from the refrigerated unit? (c) What is the power input needed for the compressors? (d) What is the COP?

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