[TRNSYS-users] TR: Window data generated by Window software lead to Trnsys Warning

[Antoine Gautier]

Hi 

 

I hereby post a late answer to an old issue thanks to Hanisch: see below.

 

I take this opportunity to ask a question concerning the 2-band radiation
calculation. Since non-visual glass properties are computed based on solar
and visual properties assuming a constant visual / solar radiation ratio
(0.466) I don't understand how a simple calculation with solar properties
only (1 band) would lead to different results regarding transmitted solar
radiation. By the way when I compute the diffuse transmittance as
QSTRNS/QSEXT for QSEXTBeam=0 I get the exact same value as the hemispheric
solar transmittance (Tsol Hemis) from the WINDOW data, whatever the value of
the visual transmittance.

Could you please explain how and why the 2-band calculation could differ
from 1-band calculation?

 

Best

--

Antoine Gautier

Solamen

+33 6 58 24 02 60

 <mailto:antoine.gautier at solamen.fr> antoine.gautier at solamen.fr

 

De : jh-ingenieure [ <mailto:info at jh-ingenieure.de>
mailto:info at jh-ingenieure.de] 
Envoyé : lundi 22 décembre 2014 17:32
À : 'Antoine Gautier'
Objet : AW: [TRNSYS-users] Window data generated by Window software lead to
Trnsys Warning

 

Dear Antonie Gautier,

 

our lokal TRNSYS-hotline (Transsolar) told us, that TRNSYS uses a different
solar-spectrum as windows.

So for glazings with high selectivity negative values for visible
transmission can accour.

For solving that problem, they advised to make a one-band rather than a
two-band calculation for the windows used in TRNSYS.

To do so, in winlib.dat (as well as in prgwin.dat) the angle dependent
values for solar-transmission and reflection  should be copied to the values
of visible transmission and reflection.

In my case the difference between the two-band calculation (with the
warning) and the one-band calculation was about 4%.

The problem should be solved in TRNSYS V18.

 

Best regards

 

Mit freundlichen Grüßen

 

Hanisch

 

 

jh-ingenieure GmbH

kiefernweg 31 | 14532 kleinmachnow  | t: 033203 87498 | e:
info at jh-ingenieure.de <mailto:info at jh-ingenieure.de> 

 

Mitglied des Vorstands des AIV zu Berlin

Prüfsachverständiger für energetische Gebäudeplanung

Dozent für Wärme- und Feuchteschutz an der HWR Berlin

Auditor für nachhaltiges Bauen (DGNB)

 

Von: Antoine Gautier [mailto:antoine.gautier at solamen.fr] 
Gesendet: Montag, 8. Dezember 2014 13:38
An: 'jh-ingenieure'
Betreff: RE: [TRNSYS-users] Window data generated by Window software lead to
Trnsys Warning

 

Hi Hanisch

 

Sorry no further insight on that matter.

I let it go considering the rather low discrepancy between calculated and
maximum value.

If you get any other information though don't hesitate to let me know.

 

Best

--

Antoine Gautier

Solamen

+33 6 58 24 02 60

antoine.gautier at solamen.fr <mailto:antoine.gautier at solamen.fr> 

 

De : jh-ingenieure [mailto:info at jh-ingenieure.de] 
Envoyé : dimanche 7 décembre 2014 21:06
À : antoine.gautier at solamen.fr <mailto:antoine.gautier at solamen.fr> 
Objet : Re: [TRNSYS-users] Window data generated by Window software lead to
Trnsys Warning

 

Dear Mr. Gautier,

 

I have the same Problem with TRNSYS as you reported in the
TRNSYS-mailing-list in April (see below).

Did you find a solution?

If so, would you be so kind to tell me your way to solve the problem.

Thanking you in anticipation.

Wit best regards

 

Mit freundlichen Grüßen

 

Hanisch

 

 

jh-ingenieure GmbH

kiefernweg 31 | 14532 kleinmachnow  | t: 033203 87498 | e:
<mailto:info at jh-ingenieure.de> info at jh-ingenieure.de

 

Mitglied des Vorstands des AIV zu Berlin

Prüfsachverständiger für energetische Gebäudeplanung

Dozent für Wärme- und Feuchteschutz an der HWR Berlin

Auditor für nachhaltiges Bauen (DGNB)

 

 

Dear users

 

 

 

I get the following warnings using window data generated by Window software

6.3. I do not get any error during window data generation. Do you know what

I should correct? (I included the detailed window data hereunder.)

 

Thanks a lot for your help.

 

 

 

*** Notice at time        :         0.000000

 

    Generated by Unit     :    27

 

    Generated by Type     :    56

 

    Message               : winlib reader: Incorrect visual transmission

values encountered in Window-ID        116. for an angle of    0 °.

Incorrect value    0.603 will be limited to the possible physically maximum

0.561! Please check your window data!

 

 

 

*** Notice at time        :         0.000000

 

    Generated by Unit     :    27

 

    Generated by Type     :    56

 

    Message               :  winlib reader: incorrect selectivity of

visual+solar transmission caused a negative value for nonvisual Transmission

Tra_ang_nonvis =   -0.026 for Window-ID        116 at an angle of    0 °

Tra_ang_nonvis is set to 0 for this angle

 

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