Frit in Windows6

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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.

Rimes, Christie's picture
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Reputation: 200

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

Robin Mitchell's picture
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Does WINDOW calculate the glazing with 100% frit and place it in the
glass library? Is that were the optical data comes from?

Rimes, Christie's picture
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Joined: 2011-09-30
Reputation: 200

Both the unfritted substrate and the 100% frit layer are put into the Glass
Library, and the program uses those two spectral data files to calculate the
optical properties of the frit that you construct.

Robin Mitchell's picture
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Hey Robin:

The rest of us then miss the learning opportunity. Perhaps simply adding
LBNL to the email to quickly get your expertise. Also, and please do not
take this the wrong way but the folks who invent it always have a skewed
view. Many times some of us learn a lot from others questions.

Thanks and take care,

Andy Hoover

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