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When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by?

When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by lowering the higher temperature.

Detailed Explanation:

The coefficient of performance of the refrigerator is given as

COP(refrigerator) = Q2/(Q1 − Q2) = T1/(T1 − T2) 

Where

Q2? is heat released to the hot reservoir

Q1? is the heat extracted from the cold reservoir

T2? is the temperature of the hot reservoir

T1? is the temperature of the cold reservoir

If lower temperature ie T1 is fixed then COP depends on higher temperature T2.

COP(refrigerator) = T1/(T1 − T2)

We can see with the decrease in higher temperature denominator will decrease and COP will increase.