[TRNSYS-users] Problem Ventilation in TRNFLOW

[hotline]

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:

  1.  All nodes have to be connected in one network
  2.  Dead ends are not allowed.



In your model, rule1 is applied but rule2 not (see red circle in the ).

[cid:image003.jpg at 01D3682B.67ACD9E0]



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 at lists.onebuilding.org] Im Auftrag von Wirich via TRNSYS-users
Gesendet: 24 November 2017 18:13
An: trnsys-users at lists.onebuilding.org
Cc: freppelw at 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
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