Sun direction

[Idan Turjeman]

Hi all,

I'm a user of Window 7 and I couldn't understand what is the sun direction when calculating the U-factor and SHGC.

The layers are numbered from 1 to n and it's not clear wether the sun is directed to the n layer or the 1st layer.

Thanks for the help.

[Robin Mitchell]

See this Knowledge Base article to understand the layer naming convention

https://windows.lbl.gov/tools/knowledge-base/articles/glazing-system 

Here is a website that has technical documentation for WINDOW which explains the calculations methods.

https://windows.lbl.gov/tools/window/documentation 

Robin

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Robin Mitchell

Building Technology and Urban Systems Division
Energy Technologies Area
Lawrence Berkeley National Laboratory