We wish to produce refrigeration at−30◦C.Areservoir, shown in Fig. P5.104, is available at 200◦Cand the ambient temperature is 30◦C.Thus, work can be done by a cyclic heat engine operating between the 200◦C reservoir and the ambient. This work is used to drive the refrigerator. Determine the ratio of the heat transferred from the 200◦Creservoir to the heat transferred from the −30◦C reservoir, assuming all processes are reversible.

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Tambient Thot Om2 W Omt Tcold Tambient FIGURE P5.104