Thanks for the quick reply just noticed there was a bit of information missing from the question ... epsilon =0.95, sigma = 5.67 x 10^-11 kW m^-2 K ^-4
So it must be stefan's constant
A room has a surface mean radiant temperature of 20oC. if a heat source of area 2 m2 at 200oC is introduced into the centre of the room, what is the rate of radiative heat transfer in kW?
Can anyone help me with this question? I can't find any examples in my notes or online and need help quick...