Heat Is Transferred Through a Plane Wall Steadily at a Rate

Multiple Choice

Heat is transferred through a plane wall steadily at a rate of 750 W. If the inner and outer surface temperatures of the wall are 30°C and 15°C, respectively, and the environment temperature is 15°C, the rate of exergy destruction within the wall is

A) 37 W
B) 731 W
C) 7200 W
D) 9600 W
E) 1.9 W