[TRNSYS-users] TRNSYS16 / type 56 convergence problem with heat recovery ventilation

Thu Jun 8 08:32:21 PDT 2017

Christophe,

   I didn't look at the files. However, the two most common issues are 
1. to make sure that you have accounted correctly for the zone thermal 
capacitance (the default value of the zone capacitance accounts only for 
the thermal capacitance of the air in the zone, not for any of the zone 
contents and furnishings). And 2. to make sure that you are using a 
short time step (no more than 5 minutes) so that the ERV can make 
control decisions on an appropriate time scale.

kind regards,

  David

On 06/08/2017 05:04, Christophe Plantier via TRNSYS-users wrote:
>
> Dear TRNSYS Users,
>
> I have a convergence problem in studio which I cannot solve. This 
> warning occurs too many times : "TRNSYS Message    441 : The inputs to 
> the listed units have not converged at this timestep. The values at 
> the last iteration will be used and the simulation will proceed.  
> Reported information  : UNITS: 56 15".  I tried to delete all links 
> with the BUI file and to recreate them one by one and the error occurs 
> when I link the heat recovery ventilation. This a classic module that 
> we use in my company and this is the first time we have such a problem.
>
> Could anybody help me ? I join the required files to run the simulation.
>
> Thanks
> -- 
> *Christophe PLANTIER *
>
> Scop ENERTECH
> *1er Prix 2015* des Trophées de l'*INGENIERIE PERFORMANTE*
> /http://www.edipa.fr/Actualite/Details/1187/
> 65, les balcons de l'Amourier 26160 Pont de Barret
> Tel & Fax : 04 75 90 18 54 - Site internet : _www.enertech.fr_
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>
>
>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
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