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Coefficient of Viscosity

For better CO...

Question

For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be:

A

high

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B

small

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C

zero

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D

equal

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Solution

The correct option is B small
COP of refrigerator = $\frac{Q_{H}}{W} = \frac{Q_{H}}{Q_{H} - Q_{C}}$ = $\frac{T_{H}}{T_{H} - T_{C}}$
For better COP of refrigerator ,the pressure range corresponding to temperature in evaporator an condenser must be small.

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