[Radiance-general] modeling an insulating glass with an integrated capillary slab

[Zack Rogers]

Hi Andy,

I think your roughness and absorption input labels are switched in this
widget.  This is a nice little tool - thanks!

Zack

On Fri, Apr 27, 2012 at 3:31 PM, Andy McNeil <amcneil at lbl.gov> wrote:

> Hi Valeria,
> Trans is a quick and easy way to model this type of glazing.
> You can use this widget to generate a trans material definition by
> entering your transmission and reflection parameters:
> http://gaia.lbl.gov/people/andy/public/transwidget/
>
> However trans does not account for Fresnel effects that reduce
> transmission of glass at non-normal incidence angles (
> http://en.wikipedia.org/wiki/File:Amptitude_Ratios_air_to_glass.JPG).  So
> treat trans results with some degree of caution.
>
> If you want to include fresnell effects and diffusion, you might consider
> use a glass surface and a trans surface one in front of the other.  Or you
> could generate a BSDF and use the new BSDF material.
>
> Hope this helps,
> Andy
>
>
>
>
>
> On Apr 27, 2012, at 1:34 PM, Valeria De Giuli wrote:
>
> > Dear all,
> > I have to model a two-pane glass make up with a selective 6mm outer pane
> with an integrated capillary slab (it is called kapilux), white tinted. The
> obtained effect is a uniform and diffuse light transmittance. The only
> technical data that I have are: 30% of direct visible transmittance  and
> 15% of diffuse visible transmittance. I think I should model it with
> "trans" material, but I don't know which parameters I have to use. Does
> anybody has an idea?
> > Thanks in advance. Best regards,
> > Valeria
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>
>
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-- 
Zack Rogers, P.E., LEED AP BD+C
Daylighting Innovations, LLC
211 North Public Road, Suite 220
Lafayette, CO 80026
(303)946-2310
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