Question

A Carnot refrigerator operates between a reserve at a TC temperature and a TH temperature reserve, if we want to increase its performance coefficient, which of the following results would achieve it? The value of ∆T remains constant:

a. Increase the temperature of the hot reserve by ∆T

b.Reduce the temperature of the hot stock by ∆T

c.Reduce the cold reserve temperature by por ∆T

d. Increase the cold reserve temperature by por ∆T

Answer 1

The coefficient of performance is given by

K = Q_L/ W

W = Q_H  - Q_L

K = T_L/T_H-T_L

​​​​​​L and H correspond to lower temp and higher temp.

So if we decrease the temp. T_{H ,}we increase K .