A composite wall consists of layers of aluminum, copper and steel. The steel external surface is \(350^{\circ} \mathrm{C}\) and the external surface of the aluminum is exposed to an ambient of \(25^{\circ} \mathrm{C}\) with a heat transfer coefficient of \(5 \mathrm{~W} / \mathrm{m}^{2}{ }^{\circ} \mathrm{C}\). Calculate the heat loss and interfacial temperature using a three-element model using the data given in Table 2.2.

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Material Aluminium Copper Steel Table 2.2 Thermal conductivity, W/m C Thickness, cm 200 400 50 5 50 15 20