Approximate a House as a Cube with an Edge Length $R$

question 15

Essay

Approximate a house as a cube with an edge length of 7 m. The house loses heat from the four walls and the roof (but not the floor). The average $R$ -value for the walls and roof is $R = 1.2$ (this takes into account walls/windows/doors/etc.). Calculate the heat loss in $\mathrm { MJ } / \mathrm { m } ^ { 3 }$ per degree day $\left( { } ^ { \circ } \mathrm { C } \right)$ and compare this to the estimated residential heating needs as discussed in this chapter.

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