The hot combustion gases of a furnace are separated from the ambient air and its surrounding which are at 25oC, by a brick wall 0.15 m thick. The brick has a thermal conductivity of 1.2 W/m-K and a surface emissivity of 0.80. Under steady state conditions the outer surface temperature of 100 oC is measured. Free Convection heat transfer to the air adjointing this surface is characterized by a convection coefficient of 20 W/m2-K. What is the inner temperature?

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