[Radiance-general] Model a Double glazing window

[Raghuram Kalyanam]

Hi Jack,

Wow this what exactly  I am looking for. Thank you very much. I have another question. Is there a better way to do geometric modeling and then export into radiance? as it seems a bit cumbersome to model in command prompt in my Mac and then check its geometry every time making an octree.

Best Regards,
Raghu

> On Dec 18, 2015, at 10:39 PM, Jack de Valpine <jedev at visarc.com> wrote:
> 
> Hi Raghu,
> 
> Here are a couple of things to think about. 
> 
> MODEL GEOMETRY
> Based on your description, I am guessing that you are using genbox to model each sheet of glass in your insulating glass unit. The     radiance materials that can be used to describe glass, such as "glass" and "brtdfunc" are designed to be applied to a surface as opposed to a volume. Using genbox will give you a volume, applying a "glass" material with a specific transmittance to that volume will not give you the correct resulting transmittance because rays are going through two pieces of geometry. In order to get the correct transmittance for a given glass material you would need to use a single surface to describe the geometry.
> 
> GLASS MATERIALS
> If all you care about is transmittance through a insulating glass unit composed of two layers of glass, there are a variety of ways to to come up with a material description. The resulting transmittance of a specific makeup should either be available from a manufacturer or can be calculated with an application like Windows or Optics (both available from LBNL). Note that for the glass material type transmittance needs to be transformed to the Radiance term for transmissivity. If you also need to more carefully account for reflectance for such a glazing unit, assuming you are using Radiance on Linux, then you can use the "glaze" script that comes with Radiance. To learn more about how to use the script, you can check out my blog post:
> http://modsimvis.blogspot.com/2014/12/glass-in-radiance.html <http://modsimvis.blogspot.com/2014/12/glass-in-radiance.html>
> Best,
> 
> -Jack de Valpine,
> Visarc Inc
> 
> 
> On 12/18/2015 12:34 PM, raghuram kalyanam wrote:
>> Hi Every one,
>> 
>> I want to model a Double glazing window which contains glasses with different transmittances. I did the following  
>> 
>> 1. window.rad -- included the properties of materials such as window frame, glass1 and glass 2
>> 2. glass.rad -- position of glasses using genbox 
>> 3. frame.rad -- position of frame using genbox
>> 
>> then made octree of altogether.
>> 
>> Please let me know if  this is the  right way or if not please suggest a better one.
>> 
>> 
>> Best Regards,
>> Raghu
>> 
>> 
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