If the throttling valve in Problem 3.62 is replaced by an isentropic turbine, what is the COP?

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If the throttling valve in Problem 3.62 is replaced by an isentropic turbine, what is the COP? Is this modifi cation practical? Explain.


Problem 3.62

Consider a refrigeration system based on an ideal vapor-compression cycle using R-134a as the refrigerant. It operates between 0.7 MPa and 0.12 MPa with a fl ow rate of 0.5 mol/s. 

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