The useful heat gain in Watt (rounded off to one decimal place) of a solar flat plate collector using Hottel-Whillier-Bliss equation is $\_\_\_\_$.
Assume:
Collector heat removal factor $=0.85$
Absorber plate area $=1.5 \mathrm{~m}^{2}$
Absorbed solar flux by the absorber plate $=600 \mathrm{Wm}^{-2}$
Overall loss coefficient $=4 \mathrm{Wm}^{-2} \mathrm{~K}^{-1}$
Water inlet temperature $=60^{\circ} \mathrm{C}$
Ambient temperature $=25^{\circ} \mathrm{C}$
