First slide

Refrigerator

Question

The coefficient of performance, in a mechanical refrigerator, the lower temperature coils of the evaporator are at $- 23^{0} C$ and compressed gas in the condenser has a temperature of $77^{0} C,$ is

Moderate

A

70
B

20
C

0.23
D

2.5

Solution

$c o p = \frac{T_{2}}{T_{1} - T_{2}} = \frac{(- 23 + 273)}{77 + 23} = \frac{250}{100} = 2.5$

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