Reactor's wall = 320 mm thick
Ti=1325 o C
Ta=25 o C
T inter=1200 o C
The mode of heat transfer from the wall is conduction. The amount of heat loss takes place from reactor wall is equal to the amount of heat that passes through fire wall and insulation.
Hence , the thickness of fire brick and insulation which gives minimum heat loss are 0.1147 m and 0.2053 m and the heat loss is