Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?
Correct answer: C
Explanation
The heat transfer rate is determined by the inside convection and conduction resistances. Solving for the inner wall temperature yields 81.25°C.