Question: Example: A two stage cascade refrigeration system is to provide cooling at -40C while operating the high temperature condenser at 1.6 MPa. Each stage

Example: A two stage cascade refrigeration system is to provide cooling at -40C while operating the high temperature condenser at 1.6 MPa. Each stage operates on the ideal vapor-compression refrigeration cycle. The upper vapor compression refrigeration system uses water as its working fluid and operates its evaporator at 5C. The lower cycle uses refrigerant 134a as its working fluid and operates its condenser at 400 kPa. This system produces a cooling effect of 20 kJ/s. Determine the mass flow rate of R-134a and water in their respective cycles and the overall COP of this cascaded system.

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