Radiation (cont.)
Blackbody: is an ideal surface which emits the maximum possible thermal radiation at a given temperature.
Irradiation (G): All incoming radiation that is incident on the surface. It can then be transmitted, absorbed or reflected from the surface. G = Gtrans + Gabs + Gref
Where t, a and r represent transmissivity, absorptivity and reflectivity, respectively. t + a + r =1