[Radiance-general] calculating transmissivity from transmittance

Fri, 19 Oct 2001 09:37:36 +0200

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Dear Ben,

the formular equals the formular in the tutorial and is correct. (We use
it since years and you can also check it with virtual tranmittance
measurements.)

The transmissivity value  should be .479807.

Jan

ben masters wrote:

>  I am trying to calculate glazing transmssivity for window glass with
> a measured transmittance of 0.44. I have tried to use the formula on
> the rayfront website
> http://www.schorsch.com/rayfront/manual/dielectricdef.html but keep on
> getting a strange answer 0f -320. Does anyone know if this formula is
> correct or how to calculate transmissivity?CheersBen Masters
>
>
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   o -           NEW ADRESS!!!
  | \            Jan Wienold
                 Fraunhofer Institute for Solar Energy Systems
                 SOLAR BUILDING DESIGN GROUP - DAYLIGHTING
                 Heidenhofstr. 2
                 79110 Freiburg
                 GERMANY

                 Phone: ++49 - (0) 761 - 4588 -5- 133
                 Fax:   ++49 - (0) 761 - 4588 -9- 133
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Dear Ben,
<p>the formular equals the formular in the tutorial and is correct. (We
use it since years and you can also check it with virtual tranmittance
measurements.)
<p>The transmissivity value&nbsp; should be .479807.
<p>Jan
<p>ben masters wrote:
<blockquote TYPE=CITE>
<div style='background-color:'>&nbsp;I am trying to calculate glazing transmssivity
for window glass with a measured transmittance of 0.44. I have tried to
use the formula on the rayfront website <a href="http://www.schorsch.com/rayfront/manual/dielectricdef.html">http://www.schorsch.com/rayfront/manual/dielectricdef.html</a>
but keep on getting a strange answer 0f -320. Does anyone know if this
formula is correct or how to calculate transmissivity?CheersBen Masters</div>

<p><br>
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<pre>--&nbsp;
-------------------------------------------------------------------
&nbsp;&nbsp; o -&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NEW ADRESS!!!
&nbsp; | \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Jan Wienold
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Fraunhofer Institute for Solar Energy Systems
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SOLAR BUILDING DESIGN GROUP - DAYLIGHTING
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Heidenhofstr. 2&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 79110 Freiburg
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; GERMANY
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Phone: ++49 - (0) 761 - 4588 -5- 133
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Fax:&nbsp;&nbsp; ++49 - (0) 761 - 4588 -9- 133
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Email: [email protected]
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Internet:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <A HREF="http://www.ise.fhg.de">http://www.ise.fhg.de</A></pre>
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