Indeed, by reducing the timestep, it worked. Than you Wirich Le 2017-12-01 00:00, Jean Marais via TRNSYS-users a écrit :
reduce the time step? Am 29.11.2017 3:50 nachm. schrieb "Wirich via TRNSYS-users" <trnsys-users@lists.onebuilding.org>:Dear Jakob, Thank you for your reply. Indeed, I didn't realize that there was a dead end in the CELLIER room. I added a duct to the ventilation network and now it works. However, this doesn't solve my heating problem. I realized that when the heating power supply is not high enough to reach the target temperature, the simulation stops, saying that the number of iteration did not reach to a convergence. Here is what I did exactly: 1) I set up a heating power supply in the room SALON3, with 3600 kJ/h The simulation stopped before the end 2) I set up the heating demand to unlimited power It worked 3) I set up a heating power supply in all rooms, with 3600kJ/h each It worked Does someone know why? it seems that TRNFLOW is not steady when the heating power supply is not high enough to reach the target setpoint. I don't quite get why? King regards Wirich Le 2017-11-28 09:29, hotline via TRNSYS-users a écrit :Dear Wirich, " Flow matrix is singular" means, that the flow network cannot be solved. This can happen if nodes are not well connected. Two rules must be applied here: * All nodes have to be connected in ONE network * Dead ends are not allowed. In your model, rule1 is applied but rule2 not (see red circle in the ). I connected them with three dummy cracks to make it work… LINK CR_001 : ID= 29 : FRNODE= P4 : TONODE= CELLIER : FRHEIGHT= 0 : TOHEIGHT= 0 : WIOWNHF= 1 : FSCALE= 1 LINK CR_001 : ID= 32 : FRNODE= CELLIER : TONODE= WC : FRHEIGHT= 0 : TOHEIGHT= 0 : WIOWNHF= 1 : FSCALE= 1 LINK CR_001 : ID= 33 : FRNODE= WC : TONODE= SDB : FRHEIGHT= 0 : TOHEIGHT= 0 : WIOWNHF= 1 : FSCALE= 1 Best Jakob__________________________________________________________________________________________________Jakob Merk M.Sc. Transsolar Energietechnik GmbH Curiestraße 2 70563 Stuttgart http://www.transsolar.com Transsolar: KlimaEngineering- Technologien für energieeffizientes Bauen und Nutzerkomfort in Gebäuden Stuttgart – München – New York – Paris Geschäftsführer :Diplom-Ingenieur Matthias Schuler, Diplom-Ingenieur Thomas Auer, Diplom-Physiker Stefan Holst, Diplom-Betriebswirt Dieter Schnelle Eingetragen beim Amtsgericht Stuttgart HRB 23347, Steuernummer: 99073/00911,USt-IdNr.: DE 152272639 -----Ursprüngliche Nachricht----- Von: TRNSYS-users [mailto:trnsys-users-bounces@lists.onebuilding.org] Im Auftrag von Wirich via TRNSYS-users Gesendet: 24 November 2017 18:13 An: trnsys-users@lists.onebuilding.org Cc: freppelw@noirot.fr Betreff: [TRNSYS-users] Problem Ventilation in TRNFLOW Hi everyone, I'm still encountering the same problem about ventilation in my project. I've set all the ventilation network, and then I closed all the windows. There is no heating device in the building. I don't understand why, but at around 749 hours, I encounter this error: COMIS MESSAGE ***** ERROR ***** Flow matrix is singular ! This might be caused by a zone that has no ventilation at all in this condition. Age of air and air change efficiency output is invalid ! And this occurs until the end of the simulation, though the simulation runs until the end. I only found that when I opened the .cer file. Moreover, when I put a heating device in a room, with limited power, the simulation stops before the end, saying that convergence was not reached. Do you think this is related to the COMIS ERROR I showed just before? If someone can help me, I attach all my project to this mail, with an illustration, in order to better understant what I did. I used TRNSYS17. Thank you in advance. King Regards Wirich PhD student Laboratoy of innovative technologies, University of Picardie Jules Vernes Avenue des Facultés, Salouël _______________________________________________ TRNSYS-users mailing list TRNSYS-users@lists.onebuilding.orghttp://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org[1]_______________________________________________ TRNSYS-users mailing list TRNSYS-users@lists.onebuilding.orghttp://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org[1]Links: ------[1] http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org_______________________________________________ TRNSYS-users mailing list TRNSYS-users@lists.onebuilding.org http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org