Perhaps it's the chapter title in the engineering reference guide.
ÂDear Benson,
I thinhk that option will be used when exporting data from the Window software (LBNL). It allows a wider range of informations and properties about the frames  and glasses are used in the E+. Look there, ok?Att,Carlos Krebs
On Thursday, 25 August 2016, ben_coelho@xxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@yahoogroups.com > wrote:ÂHello
The input output reference for WindowMaterial:Glazing under 'Field: Visible Transmittance at Normal Incidence' states:
"For uncoated glass, when alternative optical properties are available?such as thickness, visible index of refraction, and visible extinction coefficient?they can be conveerted to equivalent visible transmittance and reflectance values using the equations given in â??Conversion from Alternative Specification of Glass Optical Properties.â??"
However, I can't find a topic or document with that name in the documentation.
Does anyone know where I can find it?
Regards
Benson
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Posted by: Jean Marais <jeannieboef@xxxxxxxxx>
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