Question-and-Answer Resource for the Building Energy Modeling Community
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Hi Kostas, You can generate layer absorption coefficients by incident angle with window. In Window preferences turn on "create debug output" in the options tab. Then in optics tab turn on "use matrix method for specular glazing".
Then run the calc for the IGU in Window.
in the directory: C:\Users\Public\LBNL\WINDOW7.6\BSDFs you'll find {systemname}_0_AngularData.csv That csv file will have absorption coefficients for each layer. Below I've pasted the column names in the angular data file for your reference. The columns with absorption are named g1-[fb]Abs[1-9] where [fb] indicates front or back incident direction (you almost certainly want front) and [1-9] indicates the surface.
You can use those coefficients to calculate total absorption by integrating the energy in all incident angles.
Andy
columns in the Angular Data csv file: n Theta Phi g1-SHGC g1-Tfsol g1-Tbsol g1-Rfsol g1-Rbsol g1-fAbs1 g1-bAbs1 g1-fAbs2 g1-bAbs2 g1-Tfvis g1-Tbvis g1-Rfvis g1-Rbvis g1-Tdw-K g1-Tdw-ISO g1-Tuv
