2) Your wall has a 1.5 cm thick wood on the outside and 10 cm thick Styrofoam insulation on the inside. The outside temperature is 15 °F and inside the temperature is 10.8 °F then the temperature between the two layers of the wall is a) 68.4 °F, b) 42.9 °F, c) 17.1 °F, or d) 12.7 °F.
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Suman K.
A carpenter builds an exterior house wall with a layer of wood $3.0 \mathrm{~cm}$ thick on the outside and a layer of Styrofoam insulation $2.2 \mathrm{~cm}$ thick on the inside wall surface. The wood has a thermal conductivity of $0.080 \mathrm{~W} /(\mathrm{m} \cdot \mathrm{K}),$ and the Styrofoam has a thermal conductivity of $0.010 \mathrm{~W} /(\mathrm{m} \cdot \mathrm{K})$. The interior surface temperature is $19.0^{\circ} \mathrm{C}$. and the exterior surface temperature is $-10.0^{\circ} \mathrm{C}$. (a) What is the temperature at the plane where the wood meets the Styrofoam? (b) What is the rate of heat flow per square meter through this wall?
A carpenter builds an exterior house wall with a layer of wood $3.0 \mathrm{~cm}$ thick on the outside and a layer of Styrofoam insulation $2.2 \mathrm{~cm}$ thick on the inside wall surface. The wood has $k=0.080 \mathrm{~W} / \mathrm{m} \cdot \mathrm{K},$ and the Styrofoam has $k=0.027 \mathrm{~W} / \mathrm{m} \cdot \mathrm{K} .$ The interior surface temperature is $19.0^{\circ} \mathrm{C},$ and the exterior surface temperature is $-10.0^{\circ} \mathrm{C}$. (a) What is the temperature at the plane where the wood meets the Styrofoam? (b) What is the rate of heat flow per square meter through this wall?
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