A furnace wall consists of three insulating materials in series. 32 per cent chrome brick, magnesite bricks, and low-grade refractory bricks (k=0.5). the magnesite bricks cannot withstand a face temperature above 1500°F, and the low-grade bricks cannot exceed 600°F. What thickness of the wall will give a heat loss not in excess of 1500 Btu/(hr)(ft2) when the extreme face temperatures are 2500 and 200°F, respectively ?

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