Question

A furnace wall is made up of 23 cm of fire brick, 7.5 cm of

insulating brick and 8.9cm of red brick. The temperature at the

inner surface of wall is 800°C and that of the outer surface is

60°C Average thermal conductivity values of the three types of

bricks i.e. fire brick, insulating brick and red brick are 1.04,

0.104 and 0.744 W/m°K respectively. Neglecting resistance of

points. Calculate the rate of heat flow and temperature at the

interfaces between different kinds of bricks? ​

Answer 1

inner surface of wall is 800°C and that of the outer surface is 60°C Average thermal conductivity values of the three types of bricks i.e. fire brick, insulating brick and red brick are 1.04,