An infinitely long furnace of 0.5m ´ 0.4m cross – section is shown in the figure below. Consider all surfaces of the furnace to be maintained at temperature T1 = T3 = 927 0C while the side walls are at temperature T2 = T4 = 5270C. The view factor, F1-2 is 0.26. The net radiation heat loss or gain on side 1 is _________ W/m.
Stafen-Boltzmann constant = 5.67´10-8 W/m2-K4
