A composite wall is made of two layers of 0.3 m and 0.15 m thickness with surfaces held at 600oCand 20oC respectively. If the conductivities are 20 and 50 W/mK, determine the heat conducted. In order to restrict the heat loss to 5 kW/m2 another layer of 0.15 m thickness is proposed. Determine the thermal conductivity of the material required.
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