engineering recuitment GATE ME 2023-24 Test Series Heat Transfer Conduction Heat Conduction Through Plane and Composite Walls
A furnace wall made of steel plate 10 mm thick and thermal conductivity 15 kcal/m-hr-°C is lined inside with silica brick of 150 mm thick of thermal conductivity 1.75 kcal/m-hr-°C and on outside with magnesia bricks of 200 mm thick with thermal conductivity of 4.5 kcal/m-hr-°C. The total resistance of the composite wall will be
1
0.13 °C-hr/kcal
2
0.23 °C-hr/kcal
3
0.03 °C-hr/kcal
4
0.33 °C-hr/kcal