[Radiance-general] Frit Glass trans Paramters

Andrew McNeil amcneil at lbl.gov
Mon Apr 6 17:28:07 PDT 2015 

Aditya,

Well, shoot. Glaze is one of the few remaining c-shell scripts, which means
it won't run in DOS. Yes, you could install CGWIN. But, to save you the
hassle I've run it using the parameters you gave and the database from
Jack's blog (thanks Jack!). Though I put the frit on surface 3, because
glaze won't let you use a frit and low-e coating on the same surface. I
don't really know what effect putting the frit on surface 3 vs. underneath
the low-e on surface 2 has, but I'd guess you're much better off than had
you used a simple trans material. The BRTDfunc material definition is at
the very end of the text copied below.

hope this helps,
Andy

glaze -f jacksLibrary.db
Adding glazing types from file jacksLibrary.db :
ppg-clear-6
vir-ve12m
vir-ve22m
vir-ve32m
vir-ve42m
vir-ve52m
vir-ve62m
vir-ve72m
vir-ve82m
v-175
v-933
Enter the number of panes in the system: 2

Window normal faces interior

  | |    | |
  | |    | |
  | |    | |
  | |    | |-->
  | |    | |
  | |    | |
  | |    | |
 s1 s2  s3 s4

Supported surface types are:
   1 - ppg-clear-6
   2 - vir-ve12m
   3 - vir-ve22m
   4 - vir-ve32m
   5 - vir-ve42m
   6 - vir-ve52m
   7 - vir-ve62m
   8 - vir-ve72m
   9 - vir-ve82m
   10 - v-175
   11 - v-933

What is the type of s1? 1
What is the type of s2? 9
What is the type of s3? 10
What is the type of s4? 1
Enter fraction coverage for s3 (0-1): .6

############################################
# Glazing produced by Radiance glaze script
# $Revision: 2.8 $
# Loaded: jacksLibrary.db
# Mon Apr  6 17:18:12 PDT 2015
# Material surface normal points to interior
# Number of panes in system: 2
# Exterior surface s1 type: ppg-clear-6
# Inner surface s2 type: vir-ve82m
# Inner surface s3 type: v-175
# s3 coating coverage: .6
# Interior surface s4 type: ppg-clear-6
# Exterior normal hemispherical reflectance: 0.193682287
# Interior normal hemispherical reflectance: 0.23918856
# Normal hemispherical transmittance: 0.287884687
#
void BRTDfunc glaze2_unnamed
10
if(Rdot,cr(1*rclr,0.4*1*tclr,fr(0.022)),cr(fr(0.052),ft(0.5),0.4*rclr))
if(Rdot,cr(1*rclr,0.4*1*tclr,fr(0.036)),cr(fr(0.055),ft(0.648),0.4*rclr))
if(Rdot,cr(1*rclr,0.4*1*tclr,fr(0.024)),cr(fr(0.056),ft(0.505),0.4*rclr))
0.4*1*ft(0.5)*tclr
0.4*1*ft(0.648)*tclr
0.4*1*ft(0.505)*tclr
0 0 0
glaze2.cal
0
9
0.1494
0.1464
0.1452
0.0885
0.148646016
0.09027885
0.063
0.081648
0.06363



On Mon, Apr 6, 2015 at 5:00 PM, Aditya Potipireddi <aditect at gmail.com>
wrote:

> Andy/Jack,
>
> Thank for providing great resource. I am tying to follow to the process
> outlined and have couple of more questions:
>
> 1) Since I am using radiance using DIVA for Rhino( Windows operating
> system), it creates a Radiance folder with in the DIVA folder. I navigated
> to the radiance folder via command prompt window and tried to call for "
> glaze" it gave error as glaze is not recognized. I have even installed the
> Radiance versions 4.3.a.2 for win32.exe that I downloaded form NREL
> radiance releases. Is there a command error ?
>
> 2) The "lib" folder under both Radiance folders has only glaze.1cal(
> single pane fritted) and glaze2.cal(double pane fritted) files , there is
> no "glaze" file are these the same as glaze file?
>
> 2) does the example work flow example in the website use unix or cygwin,
> if so do i need to install cygwin? and is there specific version of
> radiance that i need to install ?
>
> 4) can I not execute glaze and optics2glazedb via windows?
>
> 3) Should the "optics2glazedb" file put in a specific location and where
> does the generated database get written to. Also, what is the file
> extension for optics2glazedb ?
>
> Appreciate your help and input.
>
> Regards,
>
> Aditya
>
>
> On Mon, Apr 6, 2015 at 12:24 PM, Jack de Valpine <jedev at visarc.com> wrote:
>
>>  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 Incorporatedwww.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>
>> 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,
>>>
>>> _______________________________________________
>>> Radiance-general mailing list
>>> Radiance-general at radiance-online.org
>>> http://www.radiance-online.org/mailman/listinfo/radiance-general
>>>
>>>
>>
>>
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>>
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>
>
> --
> Aditya Potipireddi, LEED AP
> 480.544.4936
>
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