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A two-stage cascade refrigeration system (see the figure below) operates between TC=210K and TH=305K. The intermediate temperatures are TC=255K and TH=260K. The coefficients of performance

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A two-stage cascade refrigeration system (see the figure below) operates between TC=210K and TH=305K. The intermediate temperatures are TC=255K and TH=260K. The coefficients of performance of each stage are 71% of the corresponding values for a Carnot refrigerator. Determine the ratio of the actual work to the Carnot work

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