Insulation thickness for a furnace wall (Fig. 10B.6) a furnace wall consists of three layers: (i) a
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Insulation thickness for a furnace wall (Fig. 10B.6) a furnace wall consists of three layers: (i) a layer of heat-resistant or refractory brick, (ii) a layer of insulating brick, and (iii) a steel plate, 0.25 in. thick, for mechanical protection. Calculate the thickness of each layer of brick to give minimum total wall thickness if the heat loss through the wall is to be 5000 Btu/ft2 ∙ hr, assuming that the layers are in excellent thermal contact. The following information is available:
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Thermal conductivity (Btu/hr • ft · F) at 100°F at 2000°F Maximum allowable Material temperature 2600°F Refractory brick Insulating brick 1.8 3.6 2000°F 0.9 1.8 Steel 26.1 Steel plate, 2500°F. 100°F Refractory brick Insulating brick
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