1. Show that F12 for two black
parallel planes of equal areas connected by reradiating walls at a constant
where F12 is the shape factor of
the black bodies.
2. Calculate the rate at which radiant
energy streams out from a conical cavity having a semi-vertex angle of 45° and
height 300 mm, if the surface temperature of the cavity is 600 K and the
emissivity is 0.8.