## Refrigeration Cycle

The below figure describes a refrigeration cycle using R-12a and its associated enthalpies. What is the coefficient of performance (COP)?

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__**Hint**

**Hint**

$$$COP=\frac{h_1-h_4}{h_2-h_1}$$$

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__**Hint 2**

**Hint 2**

Since this is a refrigeration cycle,
$$h_4=h_3$$
.

$$$COP=\frac{h_1-h_4}{h_2-h_1}$$$

Note that
$$h_4=h_3$$
due to the fact this is a refrigeration cycle. Thus,

$$$COP=\frac{(400-250)}{(440-400)}\cdot \frac{kJ/kg}{kJ/kg}=\frac{150}{40}=3.75$$$

3.75