how $to$ solve this... $An$ unglazed $i.e.,$ without a glass black flat$-$plate collector emissivity $=0,94$ made $of$ a metal heats water that passes through $it.$ Due $to$ the high thermal conductivity, and slow water flow rate, the water and the metal can $be$ assumed $to$ have the same temperature. The collector $is$ thin and its back surface $i.e.,$ the one not facing the sun $is$ perfectly thermally insulated. The $sky$ temperature $is-11C,$ the solar irradiation flux excluding the background radiation $of$ the $skyis868Wm2$ heat transfer coefficient $is11Wm2K$ and the ambient air temperature $is12C.,$ the convective a What $is$ the highest hot$-$water temperature that can $be$ reached? $b$ How much heat per $absorber$ surface expressed $in\frac{W}{m}2$ can $be$ delivered $to$ the water circuit $if$ the water temperature $is26C?c$ The usefulness $of$ the heat flow $absorbedby$ the water, $Q$ can $be$ evaluated $by$ expressing how much power $it$ could produce ideally. This quantity $is$ called the exergy flow, and $is$ given $byEx=Q1-T0\frac{?}{T}$ where $T0is$ the ambient temperature and $Tis$ the temperature $of$ the $absorbed$ heat. Note that these are expressed $asabsolute$ temperatures, $i.e.,inK.$ Determine the maximum exergy flow per unit area $of$ the collector. Please solve this issue $as$ soon $as$ possible its about materials engineering