[Radiance-general] Description of complex glass systems (geometry+ material)

[marina aviles olmos]

Hi Greg,

thanks.

What I actually try to do in a part of my current research is a
comparative study of the daylight efficiency of different glass systems
and some of this glasses are switchable, so thanks the link.
>From your answer, I guess that the glaze2.cal is not the exact script to
this ones although the results will be quite accurate.

The method that Jack describes has some points that I can understand at
the moment, so I have tried (for the moment) the first method:

void BRTDfunc double_glazing_a
10
if(Rdot,cr(fr(0.075),ft(0.831),fr(0.153)),cr(fr(0.188),ft(0.158),fr(0.075)))
if(Rdot,cr(fr(0.075),ft(0.899),fr(0.134)),cr(fr(0.150),ft(0.215),fr(0.082)))
if(Rdot,cr(fr(0.083),ft(0.88),fr(0.141)),cr(fr(0.150),ft(0.195),fr(0.083)))
ft(0.831)*ft(0.158)
ft(0.899)*ft(0.215)
ft(0.88)*ft(0.195)
0 0 0
glaze2.cal

0
9
0 0 0
0 0 0
0 0 0


and the results looks like right, but just to be sure:

the descrition of:

mod glass id
0
0
3 rtn gtn btn

is not included in this cases of double glazing. Is it right?
and, it is only included, I guess after your mails, only in monolitic
not double glazings, isn't it?


Marina




Greg Ward wrote:
> Hi Marina,
>
> Looks about right to me -- does it reproduce the combined
> transmittance and reflectance you're measuring? Are the interfaces
> separated by an air gap, or are some/all layers laminated with an
> optical adhesive? In the latter case, the functions in glaze2.cal
> won't compute the correct combined transmittance and reflectances.
>
> -Greg
>
>