I would like to simulate radiative heat transfer in a semi-transparent material which is exposed to solar radiation. I am coupling two physics: "Heat Transfer in Solids"& "Radiation in Participating Media", (using Discrete Ordinates Method) but I am not sure how to define incident solar radiation (in W/m2) on the boundary of semi-transparent material. There are examples in COMSOL application gallery including "Radiative Cooling of a Glass Plate" and "Radiative Heat Transfer in Finite Cylindrical Media", but all of these examples use "Surface-to-Ambient Radiation" which is not a solar radiation boundary. Is it correct to use “Boundary Heat Source” under “Heat Transfer in Solids” to enter incident solar radiation value in W/m2? Or is it acceptable to use “Incident Intensity” under "Radiation in Participating Media" to model solar radiation? “Incident Intensity” entry is in W/m2. Sr, how can I convert that to W/m2?
Any guidance is appreciated!