Solar radiation on facade

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I am trying to simulate a facade and how the heat transfer will be, together with solar radiation, done with surface to surface radiation. The heat transfer succeeds, but for the surface to surface radiation two different errors occur:

  1. When I choose for emissivity by material in 'Diffuse Surface 1', it gives the error of not having epsilon_rad with the material. This I added to the material.
  2. When I choose for emissivity by User defined, and fill in 0.85, it gives the error of missing variable 'comp1.rad.dsurf1.Ju_band'. Which I need to add to an existing step or new one.

Is it possible to simulate this and have both heat transfer and surface to surface radiation?



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