[Radiance-general] Frit Glass trans Paramters

[Jack de Valpine]

Hi Andy,

This seems as good a time as any. I put together a blog post about Glass 
in Radiance <http://modsimvis.blogspot.com/>. I need to add some 
information about the optics2rad script but have not gotten around to 
it. But it may be a helpful resource as the topic (glaze) does seem to 
come up.

Best,

-Jack

-- 
Jack de Valpine
President

Visarc Incorporated
www.visarc.com

channeling technology for superior design and construction

On 4/6/2015 2:27 PM, Andrew McNeil wrote:
> 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 
> <mailto: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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