[TRNSYS-users] Problem Ventilation in TRNFLOW

[Jean Marais]

reduce the time step?

Am 29.11.2017 3:50 nachm. schrieb "Wirich via TRNSYS-users" <
trnsys-users at 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 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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>>
>
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