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A composite wall of 2m2m is made up of 3 layers of thicknesses 25cm,10cm and 15cm with thermal conductivities of 1.7,kB and 9.5W/mK. The outside

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A composite wall of 2m2m is made up of 3 layers of thicknesses 25cm,10cm and 15cm with thermal conductivities of 1.7,kB and 9.5W/mK. The outside surface is at 20C and the inside surface is at 1080C. Determine the unknown thermal conductivity if the heat loss through the wall is 0.1344MW

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