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 De : jh-ingenieure [mailto:info@jh-ingenieure.de] 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@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@solamen.fr] 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. De : jh-ingenieure [mailto:info@jh-ingenieure.de] 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: info@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 |