Question

A refrigerator has coefficient of performance 8 if the temperature in freezer is -23 degrees,what is the temperature at which it rejects heat?

Answer 1

Coefficient of performance (`beta`) for a refrigerator is given as `beta = T_2/(T_1-T_2)` (where, `T_1` is the temperature of heat source i.e at which it will reject heat and `T_2` is the temperature of heat sink i.e temperature in freezer)

Given, `beta = 8,T_2 = (273-23) K =250 K`

So, putting the values, `T_1 = 281.25 K`