g-value (total solar energy transmittance) according to from WINDOW

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Joris Kodde

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Jan 24, 2025, 1:45:59 PMJan 24

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Dear Window users,

I am currently trying to determine the g-value for different glazing systems consisting of double glazing and indoor shading with a metallized reflective coating. This is my first project with Window and I am not sure how to calculate this.

The g-value is the total solar energy transmittance and needs to be determined according to the ISO15099. I only need the center of glazing value. Do you know what output parameter from window corresponds to the total solar energy transmittance? I can only get outputparameters SC and SGHC, which both seem to differ from this value. Any help would be appreciated greatly.

Jacob C. Jonsson (LBNL)

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Jan 24, 2025, 6:35:05 PMJan 24

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Hi Joris,

SHGC is what we call g-value in the US, so that is the number you want.

Best,

Jacob

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