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Hi @MJWitte,

Reading this thread, I understand that the radiant temperature of a zone (and consequently the operating temperature) is calculated based on the internal surface temperature of the glass, regardless of the presence of curtains.

I simulated a shoebox in EnergyPlus 23.1 with and without curtains in front of a window. I observed that the 'Surface Inside Face Temperature' of the window differs between the two scenarios: with curtains, the temperature is higher in winter and lower in summer. Additionally, the operating and radiant temperatures of the area vary by a few degrees between the two scenarios. I would have expected to obtain the same temperature values.

Has the issue with the radiant temperature calculation been addressed in one of the latest versions, or is there another explanation for the values I obtained? Unfortunately, I cannot upload pictures due to the low karma score.