Heat is conducted steadily through a 5 m x 10 m x 10 cm brick wall of a house. On a certain day, the temperature inside is maintained at 25oC when the temperature outside is -5oC. The temperature of the inner and outer surface of the wall is measured to be 20oC and 0oC respectively. If the rate of heat transfer (Q) is 1 kW, determine the rate of energy destruction (I) (a) in the wall and (b) in its universe.