(Q34) One wall of a house consists of 0.038 m thick plywood backed by 0.152 m thick insulation. The thermal conductivities of the insulation and plywood are 0.030 J/s.m.Cº and 0.080 J/s.m.Cº. The area of the wall is 25 m². The temperature at the inside surface is 25 °C and the temperature at the outside is 4°C, both being constant. Find the amount of heat conducted through the wall in one hour (a) with the insulation (b) Without the insulation. (Hint: You need to find the interface temperature). Answers for part (a) and (b) are: O OJ and 3.98 x 106 J O 3.41 x 105 J and 3.98 x 106 J o 3.41 x 105 J and 3.98 x 105 J o 3.41 x 105 J and 0 J Plywood insulation Inside (25.0°C) Heat Interface temperature-T Outside (4.0°C) G

(Q34) One wall of a house consists of 0.038 m thick plywood backed by 0.152 m thick insulation. The thermal conductivities of the insulation and plywood are 0.030 J/s.m.Cº and 0.080 J/s.m.Cº. The area of the wall is 25 m². The temperature at the inside surface is 25 °C and the temperature at the outside is 4°C, both being constant. Find the amount of heat conducted through the wall in one hour (a) with the insulation (b) Without the insulation. (Hint: You need to find the interface temperature). Answers for part (a) and (b) are: O OJ and 3.98 x 106 J O 3.41 x 105 J and 3.98 x 106 J o 3.41 x 105 J and 3.98 x 105 J o 3.41 x 105 J and 0 J Plywood insulation Inside (25.0°C) Heat Interface temperature-T Outside (4.0°C) G