The coefficient of performance of a refrigerator is 9. If the temperature inside freezer is –30°C, the temperature of the surroundings to which it rejects heat is :
Answer & explanation
Correct answer: option 3
\(k = \frac{1}{\frac{T_1}{T_2} - 1}\)
k = 9 ; T2 = - 30°C = 243 K
\(9 = \frac{1}{\frac{T_1}{243} - 1}\)
T1 = 270 K = - 3oC