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A new building to be located in a cold climate is being designed with a basement that has an $L=200-$mm$-$thick wall. Inner and outer

basement wall temperatures are $T_i=20C$ and $T_o=0C,$ respectively. The architect can specify the wall material to be either

aerated concrete block with $k_{ac}=0\mathrm{.}15\frac{W}{m}*K,$ or stone mix concrete. To reduce the conduction heat flux through the stone mix wall

to a level equivalent to that of the aerated concrete wall, what thickness of extruded polystyrene sheet $(=35k\frac{g}{m^3})$ must be

applied onto the inner surface of the stone mix concrete wall? Floor dimensions of the basement are $20m30m,$ and the expected

rental rate is $$\frac{50}{m^2}\frac{?}{?}$ month.

What is the yearly cost, in terms of lost rental income, if the stone mix concrete wall with polystyrene insulation is specified?

Thickness of extruded polystyrene sheet is

mm $.$

The yearly cost is $

Physical Properties Mathematical Functions

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