Problem # p005

Conduction and Convection of Heat

The air inside a house has a temperature of T1= 22°C. The heat transfer coefficient from the calm inside air to the wall is h1=6 W/(m²K) while the blowing wind raises the heat transfer coefficient for the cold outside air ( T4 = -12°C ) to h4=22 W/(m²K). The wall is made out of brick with a thermal conductivity of k=0.80 W/(m K) and has a thickness of L=25cm.
Neglecting heat transfer by radiation, determine temperature T2 on the inside surface and the temperature T3 on the outer surface of the wall.