Chapter 3, Problem 3.2P

A new building to be located in a cold climate is beingdesigned with a basement that has an $L=20\text{0-mm-thick}$ wall. Inner and outer basement wall temperatures are $T_i=20°\text{C}$ and $T_o=0°\text{C,}$ respectively. The architect canspecify the wall material to be either aerated concreteblock with $k_{\text{ac}}=0.15\text{W/m}\cdot \text{K,}$ or stone mix concrete. Toreduce the conduction heat flux through the stone mixwall to a level equivalent to that of the aerated concretewall, what thickness of extruded polystyrene sheet mustbe applied onto the inner surface of the stone mix concretewall? Floor dimensions of the basement are $20\text{m}\times 30\text{m},$ and the expected rental rate is $\$50/m^2/\text{income,}$ What is the yearly cost, in terms of lost rentalincome, if the stone mix concrete wall with polystyreneinsulation is specified?