A furnace wall is made of composite wall of total thickness 550 mm. Th einside layer...

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A furnace wall is made of composite wall of total thickness 550 mm. Th einside layer is made of refractory material (k = 2.3 W/m-K) and outer layer is made of an insulating material (k = 0.2 W/m-K). The mean temperature of the glass inside the furnace is 900°C and interface temperature is 520°C. The heat transfer coefficient between the gases and inner surface can be taken as 230 W/m²°C and between the outside surface and atmosphere as 46 W/m²°C. Taking air temperature = 30°C, Calculate, a. Required thickness of each layer, b. The rate of heat loss per square meter of area, c. The temperatures of the surface exposed to gases and that exposed to atmosphere. A furnace wall is made of composite wall of total thickness 550 mm. Th einside layer is made of refractory material (k = 2.3 W/m-K) and outer layer is made of an insulating material (k = 0.2 W/m-K). The mean temperature of the glass inside the furnace is 900°C and interface temperature is 520°C. The heat transfer coefficient between the gases and inner surface can be taken as 230 W/m²°C and between the outside surface and atmosphere as 46 W/m²°C. Taking air temperature = 30°C, Calculate, a. Required thickness of each layer, b. The rate of heat loss per square meter of area, c. The temperatures of the surface exposed to gases and that exposed to atmosphere.

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