In a mechanical refrigerator, the low temperature coils are at a temperature of $-23°C$ and the compressed gas in the condenser has a temperature of $27°C.$ The theoretical coefficient of performance is
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(a) Coefficient of performance $K = \frac{{{T_2}}}{{{T_1} - {T_2}}}$
$ = \frac{{(273 - 23)}}{{(273 + 27) - (273 - 23)}}$$ = \frac{{250}}{{300 - 250}} = \frac{{250}}{{20}} = 5$
$ = \frac{{(273 - 23)}}{{(273 + 27) - (273 - 23)}}$$ = \frac{{250}}{{300 - 250}} = \frac{{250}}{{20}} = 5$
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