3-61 Consider a 5-m-high, 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the figure. The thermal conductivities of various materials used, in W/m K, are k = kp = 2, kg = 8, kc = 20, kp = 15, and kg = 35. The left and right surfaces of the wall are maintained at uniform tem- peratures of 300C and 100C, respectively. Assuming heat transfer through the wall to be one-dimensional, determine (a) the rate of heat transfer through the wall; (b) the tempera- ture at the point where the sections B, D, and E meet; and (c) the temperature drop across the section F. Disregard any contact resistances at the interfaces. 300C D A 4 cm F 6 cm 4 cm B C6 cm E 100C 4 cm 8 m 1 cm 5 cm 10 cm 6 cm FIGURE 2.61