An ideal-gas refrigeration cycle uses air as the working fluid to maintain a refrigerated space at -30oC

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An ideal-gas refrigeration cycle uses air as the working fluid to maintain a refrigerated space at -30oC while rejecting heat to the surrounding medium at 30oC. If the pressure ratio of the compressor is 4, determine
(a) The maximum and minimum temperatures in the cycle,
(b) The coefficient of performance (COPR) and
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