Question

In a mechanical refrigerator, the temperature coils are at a temperature $-{23}^{0}C$ and the compressed gas in condenser has a temperature of ${27}^{0}C$. Theoretical coefficient of performance is:

• A. $10$
• B. $8$
• C. $5$
• D. $6.5$

Answer 1

The correct option is C $5$

Temperature of coil, $T_2=-{23}^{o}C=250K$

Temperature of condenser, $T_1={27}^{o}C=300K$

C.O.P = $\frac{T_2}{T_1-T_2}=\frac{250}{300-250}=5$

Hence, C.O.P of refrigerator is $5$.