Problem $4\mathrm{.}3$

The enclosure shown in the figure below has its base maintained at $150C$ while one

of the sides is maintained at $300C.$ The other four surfaces are maintained at

$200C.$

a$)$ determine all non$-$zero view factors

b$)$ if all six surfaces are black bodies, calculate the net rate of heat transfer to$,$

or away from the base surface, and the side surface which is at $300C$