[Radiance-general] transmission/transmissivity

[Bernhard Sommer]

Hi,
Sorry, for the interrubtion. 
On radiance-online.org, you are quoting the formula
tn = (sqrt(.8402528435+.0072522239*Tn*Tn)-.9166530661)/.0036261119/Tn
to get from transmission to transmissivity; 
Can you tell me the source of that formula?
Is there an ISO standard to calculate this?

Also, you say, there is a software called window, to calculate the transmissivity properly for double glazed panes.
Can you provide a link to that software.

I am teaching Energy Design for architects in Vienna and would like to provide the students with some proper information.

Thanks a lot
Bernhard Sommer




--
Arch. Dipl.-Ing. Bernhard Sommer
staatl. befugter u. beeideter Ziviltechniker

ED_energiedesign
Forschung & Lehre

Universität für angewandte Kunst Wien
Institut für Architektur
A-1010 Wien, Oskar Kokoschka-Platz 2
T   +43 1 711 33 *2372
F   +43 1 711 33 *2339
energie.design at uni-ak.ac.at
www.dieangewandte.at/energie.design

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