Question

4.2 A vapor compression refrigeration machine uses 30kW of electric power to produce 50 tons of cooling. What is

its COP?

Answer 1

5.833

Step-by-step explanation:

Coefficient of Perfomance (COP) is the ratio of refrigeration effect to power input.

`COP=\frac {RE}{P}` where RE is refrigeration effect and P is power input

Here, the power input is given as 30 kW

We also know that 1 ton cooling is equivalent to 3.5 kW hence for 50 tons, RE=50*3.5=175 kW

Now the
`COP=\frac {175}{30}=5.833`