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Q: 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 aλ = 0, 0.8, 0, and 0.9 for 0 0.5 µm, 0.5µm 1 µm, 1 µm 2 µm, and λ 2 µm, respectively. Determine the absorbed irradiation, emissive power, radiosity, and net radiation heat transfer from the surface.