engineering recuitment GATE ME 2023-24 Test Series Heat Transfer Conduction Heat Conduction Through Plane and Composite Walls
A wall of furnace is made up of inside layer of silica brick 150 mm thick covered with a layer of magnesite brick 300 mm thick. The temperature at the inside surface of silica brick wall and outside surface of magnesite brick wall are 800°C and 200°C respectively. The contact thermal resistance between the two walls at the interface is 0.0045 °C/W per unit wall area. If the thermal conductivity of silica and magnesite brick are 1.5 W/m°C and 5.2 W/m°C. The rate of heat loss per unit area of wall will be (in kW/m2)
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