Radiative Heat Transfer Problem

[BSFE1990]

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 ... Thanks guys

 

[1994Bhaskar]

TRY TO APPLY STEFAN'S LAW OF RADIATION.
E=sigma*A*T^4
where sigma is stefan's constant.
A is area.
T is temperature.

 

[BSFE1990]

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