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
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