A composite wall is made up of 3 layers of thicknesses 25 cm, 10 cm and 15 cm with thermal conductivities of 1.7, kB and 9.5 W/mK. The outside surface is exposed to air at 20°C with convection coefficient of 15 W/m2K and the inside is exposed to gases at 1200°C with a convection coefficient of 28 W/m2K and the inside surface is at 1080°C. Determine the unknown thermal conductivity.
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the right answer is 2014 ok
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