A three layer insulation is proposed for a computer room to be maintained at 20ºC. The materials chosen are 10mm 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 39ºC with convection coefficient of 60 W/m2K.
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