Open$-$plan office space located in a single$-$storey office building has a floor area is

$13\mathrm{.}7m18\mathrm{.}3m,$ floor$-$to$-$ceiling height $=3\mathrm{.}7m($no plenum between the space and

roof$).$ The desired indoor conditions are $25C$ dry$-$bulb temperature and $50\%$ relative

humidity during cooling season. The windows face 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. Because of this, we will assume that the maximum

cooling load for space occurs at $5$ p$.$m$.$

The west$-$facing wall, $3\mathrm{.}7$ m high $13\mathrm{.}7m$ long, constructed of $204$ mm concrete block