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Re: [TRNSYS-users] Heat exchangers network modelling problem

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,

 David



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@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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