An opaque surface, 2 m by 2 m, is maintained at 400 K and is simultaneously exposed to solar irradiation with G = 1200 W/m2 . The surface is diffuse and its spectral absorptivity is αλ = 0, 0.8, 0, and 0.9 for 0 < λ < 0.5μm, 0.5μm < λ < 1μm, 1μm, < λ < 2μm, and λ > 2μm, respectively. Determine the absorbed irradiation, emissive power, radiosity, and net radiation heat transfer from the surface.