A brick wall of 20cm thickness has thermal conductivity of 0.7 W/mK. An insulation of thermal...

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A brick wall of 20cm thickness has thermal conductivity of 0.7 W/mK. An insulation of thermal conductivity 0.2 W/mK is to be applied on one side of the wall, so that the heat transfer through the wall is reduced by 75%. The same temperature difference is maintained across the wall before and after applying the insulation. The required thickness (in cm) of the insulation is A brick wall of 20cm thickness has thermal conductivity of 0.7 W/mK. An insulation of thermal conductivity 0.2 W/mK is to be applied on one side of the wall, so that the heat transfer through the wall is reduced by 75%. The same temperature difference is maintained across the wall before and after applying the insulation. The required thickness (in cm) of the insulation is

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