A cross section of a wall is shown in Fig. 2.37. Determine the heat flow for a 0.25 m height for unit depth. The surface temperatures are – 15°C and 20°C. The conductivities of the materials are k A = 0.65 W/mK, kB = 0.08 W/mK, kC = 0.16 W/mK, kD = 2.10 W/mK, kE = 3.5 W/mK. Material A is exposed to – 15°C. Also find interface temperatures.