Question

Consider a room that is initially at the outdoor temperature of 20°C. The room contains a 5 W light bulb, a 85 W TV set, a 40 W refrigerator, and a 44 W iron. Assume no heat transfer through the walls. By applying the rate form of the energy balance, determine the rate of increase of the energy content of the room when all of these electric devices are on. Give your answer in W to 0 decimal place.

Fig: 1