Problem (3): 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/mK, are ka = kF = 2, kB = 8, kc = 20, kD = 15, and ke =
35. The left and right surfaces of the wall are maintained at
uniform temperatures of 300°C and 100°C, respectively.
Assuming heat transfer through the wall to be one-
dimensional, determine (a) the rate of heat transfer through the
wall; (b) the temperature 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. [4 points]
300°C
1 cm
↑c
A 4 cm
D
6 cm
F
B
E
6 cm
4 cm
C
4 cm
5 cm
*
10 cm
100°C
8 m
6 cm
