A 40-cm-thick brick wall (k = 0.72 W/m · °C, and α= 1.6 × 10-7 m2/s) is heated to an average temperature of 18°C by the heating system and the solar radiation incident on it during the day. During the night, the outer surface of the wall is exposed to cold air at -3°C with an average heat [transfer coefficient of 20 W/m2 °C, determine the wall temperatures at distances 15, 30, and 40 cm from the outer surface for a period of 2 h.
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