Question: A refrigerator using R-12 as the working fluid keeps the refrigerated space at 215C in an environment at 30C. You are asked to redesign this

A refrigerator using R-12 as the working fluid keeps the refrigerated space at 215°C in an environment at 30°C. You are asked to redesign this refrigerator by replacing R-12 with the ozone-friendly R-134a. What changes in the pressure levels would you suggest in the new system? How do you think the COP of the new system will compare to the COP of the old system?

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