[Radiance-general] Frit Glass trans Paramters

[Andrew McNeil]

Aditya,

Trans isn't really a great option for modeling glazing with frit since the
transmission properties don't change with angle. I'd recommend using the
glaze script that comes with Radiance to build up your glazing material.
You simply type 'glaze' at the command line and follow the prompts. the
internal demo database already has the V175 frit.

Jack de Valpine gave a presentation describing how to use glaze to build up
an IGU. And how to use data from LBNL optics to add entries to your glaze
database (slide 10). He has the low-e coating you're proposing on slide 10,
so you might be able to just copy it into your local database.
http://www.radiance-online.org/community/workshops/2009-boston-ma/Presentations/devalpine_visarc_glazing.pdf

Best,
Andy


On Sun, Apr 5, 2015 at 10:57 PM, Aditya Potipireddi <aditect at gmail.com>
wrote:

> Hi All,
>
> I am trying to model frit glass with varying percentage( 20% to 60%)  of
> silk screen coverage(dots)  using trans material to compare illuminance
> levels and glare. I am using DIVA for Rhino simulation interface for
> Radiance simulation. I am representing the glass as a single surface in the
> model.
>
> I am struggling to come up with the Transmitted specularity(Ts), Diffuse
> Transmission(Td) , Reflected specularity(Rs) and the Diffuse reflectance
> (Cr, Cg,Cb) , so as to calculate the A1 to A7 trans material values.
>
> Any suggestion or pointers on how to estimate or get the above values?
>
> for example, I have the following frit glass assembly with 60% coverage
> that I pulled form glass manufacture website.
>
> 1/4" (6mm) clear VE-85 #2 and 60% Coverage V175 #2
>
> 1/2" (13.2mm) argon space
>
> 1/4" (6mm) clear
>
>
> Appreciate your help!
>
>
> Best,
>
> --
> Aditya Potipireddi,
>
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>
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