QUESTION

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Q3: A wall $2 \mathrm{~cm}$ thick is to be constructed from material that has an average thermal conductivity of $1.3 \mathrm{~W} / \mathrm{m}$. $\mathrm{C}$. The wall is to be insulated with material having an average thermal conductivity of $0.35 \mathrm{~W} / \mathrm{m}^{\circ} \mathrm{C}$, so that the heat loss per square meter will not exceed $1830 \mathrm{~W}$. Assuming that the inner and outer surface temperatures of the insulated wall are 1300 and $30^{\circ} \mathrm{C}$, calculate the thickness of insulation required.

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