First slide

Refrigerator

Question

In a mechanical refrigerator, the low temperature coils of the evaporator are at -23Â°C and the compressed gas in t}le condenser has a temperature of 77Â°C. The coefficient of performance is

Moderate

A

70%
B

20%
C

0.23
D

2.5

Solution

$Î² = \frac{T_{2}}{T_{1} â T_{2}}, T_{1} = 77^{â} C = 350 K and T_{2} = â 23^{â} C = 250 K Î² = \frac{250}{350 â 250} = \frac{250}{100} = 2 â 5$

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