First slide

Refrigerator

Question

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

Easy

A

5
B

8
C

6
D

6.5

Solution

T₂ = 273 – 23 = 250k
T₁ = 300k
$\beta = \frac{{{T_2}}}{{{T_1} - {T_2}}} = \frac{{250}}{{300 - 250}} = \frac{{250}}{{50}} = 5$

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