- #1

sprotte

- 1

- 0

after 10 years without any physics, I have trouble solving the following problem:

"If your mean surface temperature is 28 C, what is your emittance? If the mean wall temperature in the room in which you are standing is 20 C, what is the average thermal irradiance at your surface? Estimate your net radiant heat loss. Assume surface emissivity is 0.97 and the wall emissivity is 1."

I know that I have to calculate the emittance with the Stephan-Boltzmann-Law, but I have no clue how to get the irradiance at the surface and how to estimate the net radiant heat loss! Should not be that much of a problem for a physics expert, but I am struggling with this for hours now. Thanks in advance...

Regards,

Phyler