Consider a plane wall 30 cm thick. The inner surface is kept 400 ℃, and the
outer surface is exposed to an environment at 800 ℃ with a heat transfer
coefficient of 12 W/m.℃. If the temperature of the outer surface is 685 ℃.
Determine the thermal conductivity of the wall.
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The outer surface of the insulation is exposed to cooler air at 30oC ... Thermal conductivity of insulation, k2 = 0.2 W/m oC. ... Heat transfer co -efficient at innear side, hhf = 400 W/m2oC.
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