[TRNSYS-users] Heat exchangers network modelling problem

David BRADLEY via TRNSYS-users trnsys-users at lists.onebuilding.org
Mon Apr 3 09:16:22 PDT 2017

Dr Belmonte,

   It is quite common and intentional that components would be called 
more than once at a single timestep. The TRNSYS engine iterates through 
the components until it gets a converged solution at each timestep from 
all the components in the system. If the system is a pass-through (i.e. 
the working fluid goes once through the system and there are no fluid 
loops anywhere in the system then I would not expect to see iterations 
but as soon as there is a feedback loop you should get iteration.

kind regards,


On 04/03/2017 06:09, Miguel Angel Reyes via TRNSYS-users wrote:
> Hi all,
> I’m modelling a system using a network of heat exchangers for heat 
> recovery purposes (see attached picture).
> Heat exchanger calculations seems to be repeated many times for a 
> given time-step and their temperatures re-calculated within the same 
> time-step while other components on that model are not updated until 
> the next time step (as it should be). Problem observed at the 
> exchanger is leading to wrong temperature calculations. From our 
> understanding types should be only be called once every time-step, 
> furthermore heat exchangers network should be re-calculated taking the 
> temperature from connecting models. Is there any option or any idea to 
> bring light on this problem?
> Kinds regards
> ---------------------------------------------------
> Dr. Miguel Ángel Reyes Belmonte
> IMDEA ENERGY Institute
> Avda. Ramón de la Sagra, 3
> Parque Tecnológico de Móstoles
> E-28935 Móstoles, Madrid, Spain
> Telf.: +34 91 737 1150
> e-mail: miguelangel.reyes at imdea.org <mailto:miguelangel.reyes at imdea.org>
> web: http://www.energy.imdea.org
> https://es.linkedin.com/pub/miguel-angel-reyes/7b/347/b77
> orcid.org/0000-0002-9666-2388
> _______________________________________________
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Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

d.bradley at tess-inc.com


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