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Re: [TRNSYS-users] Problem Ventilation in TRNFLOW



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 ).

 

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

Attachment: modele.b17
Description: modele.b17