A heat-driven refrigeration plant operates steadily as a closed system. There is no mechanical power input or output. The refrigeration load extracted from T L = 280 K is Q̇ L . The plant receives the...

A heat-driven refrigeration plant operates steadily as a closed system. There is no mechanical power input or output. The refrigeration load extracted from T_L
= 280 K is Q̇_L. The plant receives the heat input Q̇
_H
from the high temperature T_H
= 1000 K. The plant rejects Q̇
₀
to the ambient at T₀
= 300 K. The efficiency of this power plant is defined as 𝜂 = Q̇
_L∕Q̇
_H. Complete the inequality 𝜂