[Bldg-sim] Frit in Windows6

Robin Mitchell RDMitchell at lbl.gov
Fri Jul 16 13:12:23 PDT 2010


Christie -

 

The substrate is the glass without the frit. If it is not a glass layer
already in the WINDOW glass library, a spectral data file needs to be
generated from a measurement.

 

Then the substrate with 100% frit is also measured. This allows WINDOW to
have a value for the substrate without the frit and the substrate with the
frit, which along with your input of how much the actual frit coverage is,
will allow the program to do the calculation.

 

In general, although there is much expertise on this list-serve, I would
recommend that subscribers to this list email LBNL directly when they have
questions about our software (WINDOW, THERM, Optics, etc), rather than
posting the question here.

 

Robin Mitchell

Windows & Daylighting Group

Lawrence Berkeley National Laboratory 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Rimes, Christie
Sent: Friday, July 16, 2010 1:01 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Frit in Windows6

 

Hi All,

 

Why we are all talking about glazing properties, I wanted to see if anyone
had used the new Version of Windows 6 to calculated the glazing properties
of fritted glass. My main question is do we need to get the manufacture to
test the glass with 100% frit on it and then use these properties for the
"glass substrate". And where does the glazing properties come from for the
specular and diffuse optical data.

 

My first guess was that the glass substrate was the glass layer you were
applying the frit to without any properties changed with the use of frit and
that the optical data came from the manufacturer when the glass was measured
with 100% frit.

 

The following is the information on modeling frit from the Windows 6 manual.

 

The properties of the fritted glass must be measured in a spectrophotometer,
with 100% frit coverage on a substrate. The substrate used to measure the
frit is specified when defining the fritted glass in WINDOW in the Shading
Layer Library. The percentage of frit coverage is input, and WINDOW will
calculate the optical properties of the frit percentage specified

 

Glass Substrate: This pulldown list shows all the records in the Glass
Library. Select the glass layer that was used as the substrate when the frit
was measured. This substrate should not be changed from the measured
substrate - if it is, the calculated results from WINDOW will not be valid.

 

Frit Coverage: The percent of the substrate that is covered in the frit. The
original measurement to obtain the optical properties of the frit is based
on 100% frit coverage, and with that information, WINDOW can recalculate the
optical properties of the frit at any frit coverage specified.

 

Specular Reference to the layer in the Glass Library that represents the
specular measurement of the glass 

Diffuse Reference to the layer in the Glass Library that represents the
diffuse measurment of the glass.

 



 

Christie Rimes, Building Simulation Analyst
WSP Flack + Kurtz
405 Howard Street, Suite 500
San Francisco, CA 94105
Direct: 415.402.2727
Main Tel: 415.398.3833
Fax: 415.433.5311
website: http://www.wspfk.com
vCard:
http://vcards.wspfk.com/vcardloader.php?filename=flackkurtz-christie-rimes-w
spfk-com-1255981339.vcf
image: 

 

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