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  3. a three layer insulation is proposed for a computer room...

Question: a three layer insulation is proposed for a computer room...

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A three layer insulation is proposed for a computer room to be maintained at 20°C. The materials chosen are 10 mm layer finishing material inside with k = 0.12 W/mK and a 20 mm layer of weathering material on the outside with k = 0.25 W/mK. The heat gain is limited to 7 W/m2. Determine the conductivity of the material required for the middle layer if the thickness is restricted to 100 mm. The convection coefficient on the inside is 30 W/m2K. The outside air is at 39°C with a convection coefficient of 60 W/m2K

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