Ch$4-$Assignment $-1$

Evaluate the top loss coefficient for an absorber with a single glass cover with the following specifications:

Absorber$-$to$-$cover spacing: $25mm,$ Mean plate temperature: $100C$

Ambient air and sky temperatures: $16C$ and $10C$ Wind heat transfer coefficient: $10\frac{W}{m^2}K$

Absorber emittance: $0\mathrm{.}95$

Assum cover temp :$31$ c

Glass emittance: $0\mathrm{.}88$

Collector tilt: $45$ air properties are $v=1\mathrm{.}96{10}^{-5}\frac{m^2}{s},k=0\mathrm{.}0293\frac{W}{m}C.$ and $Pr=0\mathrm{.}7$