<div dir="auto">reduce the time step?</div><div class="gmail_extra"><br><div class="gmail_quote">Am 29.11.2017 3:50 nachm. schrieb "Wirich via TRNSYS-users" <<a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>>:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Jakob,<br>
<br>
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.<br>
<br>
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.<br>
Here is what I did exactly:<br>
1) I set up a heating power supply in the room SALON3, with 3600 kJ/h<br>
The simulation stopped before the end<br>
2) I set up the heating demand to unlimited power<br>
It worked<br>
3) I set up a heating power supply in all rooms, with 3600kJ/h each<br>
It worked<br>
<br>
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?<br>
<br>
King regards<br>
<br>
Wirich<br>
<br>
<br>
Le 2017-11-28 09:29, hotline via TRNSYS-users a écrit :<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Dear Wirich,<br>
<br>
" Flow matrix is singular" means, that the flow network cannot be<br>
solved. This can happen if nodes are not well connected. Two rules<br>
must be applied here:<br>
<br>
* All nodes have to be connected in ONE network<br>
* Dead ends are not allowed.<br>
<br>
In your model, rule1 is applied but rule2 not (see red circle in the<br>
).<br>
<br>
I connected them with three dummy cracks to make it work…<br>
<br>
LINK CR_001 : ID= 29 : FRNODE= P4 : TONODE= CELLIER :<br>
FRHEIGHT= 0 : TOHEIGHT= 0 : WIOWNHF= 1 : FSCALE= 1<br>
<br>
LINK CR_001 : ID= 32 : FRNODE= CELLIER : TONODE= WC :<br>
FRHEIGHT= 0 : TOHEIGHT= 0 : WIOWNHF= 1 : FSCALE= 1<br>
<br>
LINK CR_001 : ID= 33 : FRNODE= WC : TONODE= SDB :<br>
FRHEIGHT= 0 : TOHEIGHT= 0 : WIOWNHF= 1 : FSCALE= 1<br>
<br>
Best<br>
Jakob<br>
<br>
______________________________<wbr>______________________________<wbr>______________________________<wbr>________<br>
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<br>
Jakob Merk M.Sc.<br>
<br>
Transsolar Energietechnik GmbH<br>
<br>
Curiestraße 2<br>
<br>
70563 Stuttgart<br>
<br>
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<br>
Transsolar: KlimaEngineering- Technologien für energieeffizientes<br>
Bauen und Nutzerkomfort in Gebäuden<br>
<br>
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<br>
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Schnelle<br>
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-----Ursprüngliche Nachricht-----<br>
Von: TRNSYS-users [mailto:<a href="mailto:trnsys-users-bounces@lists.onebuilding.org" target="_blank">trnsys-users-bounces@l<wbr>ists.onebuilding.org</a>]<br>
Im Auftrag von Wirich via TRNSYS-users<br>
Gesendet: 24 November 2017 18:13<br>
An: <a href="mailto:trnsys-users@lists.onebuilding.org" target="_blank">trnsys-users@lists.onebuilding<wbr>.org</a><br>
Cc: <a href="mailto:freppelw@noirot.fr" target="_blank">freppelw@noirot.fr</a><br>
Betreff: [TRNSYS-users] Problem Ventilation in TRNFLOW<br>
<br>
Hi everyone,<br>
<br>
I'm still encountering the same problem about ventilation in my<br>
project.<br>
<br>
I've set all the ventilation network, and then I closed all the<br>
windows.<br>
<br>
There is no heating device in the building.<br>
<br>
I don't understand why, but at around 749 hours, I encounter this<br>
error:<br>
<br>
COMIS MESSAGE ***** ERROR *****<br>
<br>
Flow matrix is singular ! This might be caused by a zone that has no<br>
<br>
<br>
ventilation at all in this condition.<br>
<br>
Age of air and air change efficiency output is invalid !<br>
<br>
And this occurs until the end of the simulation, though the simulation<br>
runs until the end. I only found that when I opened the .cer file.<br>
<br>
Moreover, when I put a heating device in a room, with limited power,<br>
the simulation stops before the end, saying that convergence was not<br>
reached. Do you think this is related to the COMIS ERROR I showed just<br>
before?<br>
<br>
If someone can help me, I attach all my project to this mail, with an<br>
illustration, in order to better understant what I did. I used<br>
TRNSYS17.<br>
<br>
Thank you in advance.<br>
<br>
King Regards<br>
<br>
Wirich<br>
<br>
PhD student<br>
<br>
Laboratoy of innovative technologies, University of Picardie Jules<br>
Vernes Avenue des Facultés, Salouël<br>
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</blockquote>
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