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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@labein.es [mailto:frodriguezpc@labein.es]
Verzonden: maandag 27 september 2010 9:42
Aan: Mariëlle Nuchelmans
CC: trnsys-users@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
**************** AVISO LEGAL **************** DISCLAIMER ******************
Este mensaje es personal y confidencial y su uso no autorizado está prohibido
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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.
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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.