[TRNSYS-users] digging into trnflow convergence problems

[frodriguezpc at labein.es]

I am just using a scheduled input (type 14b)  for heating and cooling. 
I'll try to change that and see how it goes...

Thanks for the tip!!

Francisco Rodríguez Pérez-Curiel

TECNALIA-Construcción
Parque Tecnológico, Edificio 700. E-48160 Derio (Bizkaia) (SPAIN)
Tel. +34 94 607 33 00,  Fax. +34 94 607 33 49
francisco.rodriguez at tecnalia.com,
www.tecnalia.com

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Mariëlle Nuchelmans <M.Nuchelmans at chri.nl> 
27/09/2010 09:49

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"frodriguezpc at labein.es" <frodriguezpc at labein.es>
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"trnsys-users at cae.wisc.edu" <trnsys-users at cae.wisc.edu>
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RE: [TRNSYS-users] digging into trnflow convergence problems






Are you using a thermostate or an equation to control the cooling? You 
should use an thermostate. An equation gives a zero or an one, so it can 
go off/on/off/on and your program crashes (on because it reaches setpoint 
and then off because wanted temperature is reached) A thermostate has a 
dead band and it chooses on/off after 5 iterations. It is less accurate 
but your program runs.
 
Good luck 
 
Mariëlle 
 
Van: frodriguezpc at labein.es [mailto:frodriguezpc at labein.es] 
Verzonden: maandag 27 september 2010 9:42
Aan: Mariëlle Nuchelmans
CC: trnsys-users at cae.wisc.edu
Onderwerp: RE: [TRNSYS-users] digging into trnflow convergence problems
 

It crashes even at n=7 timestep... I am pretty sure it has to do with this 
temparature thing. A check to my lst file shows this clear pattern with 
lack of convergence in al the external temperature peaks, so I turned off 
cooling and the result is I get convergence thanks to interior 
temperatures going above exterior at most of the previous conflict 
timesteps... still there are a couple times of year where I still get 
higher ext. temps, and convergence problems show 

Francisco Rodríguez Pérez-Curiel

TECNALIA-Construcción
Parque Tecnológico, Edificio 700. E-48160 Derio (Bizkaia) (SPAIN)
Tel. +34 94 607 33 00,  Fax. +34 94 607 33 49
francisco.rodriguez at tecnalia.com,
www.tecnalia.com

**************** AVISO LEGAL  **************** DISCLAIMER 
******************
Este mensaje es personal y confidencial y su uso no autorizado está 
prohibido legalmente. Si usted no es el destinatario, proceda a borrarlo, 
sin reenviarlo ni conservarlo.
This message is personal and confidential, unauthorised use is legally 
prohibited. If you are not the intended recipient, delete it without 
resending or backing it.
************************************************************************************** 



Mariëlle Nuchelmans <M.Nuchelmans at chri.nl> 
27/09/2010 09:18 


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"frodriguezpc at labein.es" <frodriguezpc at labein.es> 
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"trnsys-users at cae.wisc.edu" <trnsys-users at cae.wisc.edu> 
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RE: [TRNSYS-users] digging into trnflow convergence problems
 


 
 




You could try even smaller time-steps, I’ve models with timestep: 0,03125 
(n=5), 0,015625 (n=6) and even 0.0078125 (n=7). It just takes a while 
before it’s finished calculating. 
  
Kind regards, 
  
Mariëlle 
 


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