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[EnergyPlus_Support] Long-wave radiation from shading surfaces

Hello,

In the Engineering Reference on p.101, it says that long-wave radiation emitted by shading surfaces onto a building surface is "added to long-wave radiation".

I was wondering how this is done exactly? So in the program it is assumed that they have an emissivity of 0.9 and the same temperature as the air (just as for the ground), but then what about the view factor between building surface and shading surface? How do they take this into account?

Thanks in advance!
Thomas



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