A building has a $2\mathrm{.}4$ m deep basement $($foundation$)$ wall that is $100$ m long. The wall

has no windows. On average, $2\mathrm{.}1$ m of the wall is below grade $($underground$).$

Assume the outside air temperature is $10$C$,$ the inside temperature is $20$C$,$ and the

average ground temperature is $10$C$.$

a$.$ b$.$ Determine the rate of heat loss through the wall below grade if it is uninsulated.

Determine the rate of heat loss through the wall below grade if it is insulated with an R$-$value of about $2\mathrm{.}2$C$$m$2/$W$.$