QUESTION $2$

$2\mathrm{.}1$ Categorise and explain the loads used in cooling load calculations.

$2\mathrm{.}2$ Open$-$plan office space located in a single$-$storey office building has a floor area $13\mathrm{.}7m18\mathrm{.}3m,$ floor$-$to$-$ceiling height $=3\mathrm{.}7m($no plenum between the space and roof$).$ The desired indoor conditions are $26C$ dry$-$bulb temperature, $35C$ maximum outdoor temperature during cooling season. The windows face south$-$west and the solar heat gain through these windows will peak in the late afternoon when the sun is setting and shining directly into the windows. Assume that that the maximum cooling load for space occurs at $4$ p$.$m$.$

The southwest$-$facing wall, $3\mathrm{.}7$ m high $13\mathrm{.}7m$ long, constructed of $204$ mm concrete block $(R=0\mathrm{.}35m^2\frac{K}{W})$ with aluminium siding $(R=0\mathrm{.}11m^2\frac{K}{W})$ on the outside $90$ mm of insulation of fibreglass $(R=2\mathrm{.}29m^2\frac{K}{W}),$ and $13$ mm gypsum board $(R=0\mathrm{.}08m^2\frac{K}{W})$ inside. Additionally, there is air film on the outside of the wall $(R=0\mathrm{.}04m^2\frac{K}{W})$ moving at $12k\frac{m}{h}$ during the summer and another air film on the inside surface of the wall $(R=0\mathrm{.}12m^2\frac{K}{W},$ still air$).$ Eight clear, double$-$pane $(6\mathrm{.}4$ mm with U $-$factor of $3\mathrm{.}56\frac{W}{m^2}K)$ windows are mounted in Aluminium frames with each window $1\mathrm{.}2m1\mathrm{.}5m$ high. The roof is flat $($Type $3),13\mathrm{.}7m18\mathrm{.}3m$ constructed of $100$ mm lightweight concrete $(R=0\mathrm{.}54m^2\frac{K}{W})$ with $90$ mm insulation $(($:$R=2\mathrm{.}29m^2\frac{K}{W}$