$0$

Problem $01\mathrm{.}103$E Solar Collector

Consider a flat$-$plate solar collector placed horizontally on the flat roof of a house. The collector is $5$ ft wide and $15$ ft long, and the average temperature of the exposed surface of the collector is $102F.$ The emissivity of the exposed surface of the collector is $0\mathrm{.}9.$ Determine the rate of heat loss from the collector by convection and radiation on a calm day when the ambient air temperature is $70F$ and the effective sky temperature for radiation exchange is $50F.$ Take the convection heat transfer coefficient on the exposed surface as $2\mathrm{.}5$ Rtu $.$h$.$ft $2.F$

Giveri.

$=0\mathrm{.}1714{10}^{-8}Bt\frac{u}{h}*f{t}^2*R^4$

Btu$/$h