[TRNSYS-users] Real-time simulation

[David BRADLEY]

Santiago,
   I'm not sure that you need to do anything special. The TRNSYS kernel 
(the brains that determine when convergence has been reached) call the 
Types and then just waits until the Type hits its "return" statement 
(returning control to the kernel). The kernel will not increment the 
timestep until all of the outputs from Types have converged (stopped 
changing from one iteration to the next). I assume that you have 
developed some Type in your simulation that communicates with your 
controller. The kernel should call that Type and then wait until the 
controller is ready to make its decision. The controller's decision 
should get placed into the Type's outputs and then the Type should 
return control to the kernel as all Types do. The one thing you might do 
a little differently is to prevent your Type/controller from trying to 
make a new decision at every simulation iteration; allow it to make one 
control decision per time step and then hang on to that control decision 
until the next time step. You can do that either by having your Type 
only process at the "post convergence" call or it can make its decision 
on the first iteration of a new time step and then return without 
reevaluating at all other iterations.
Best,
  David


On 3/24/2011 09:11, Santiago Naranjo Palacio wrote:
> /Dear TRNSYS Users,/
> //
> Is there a way to run TRNSYS on real-time? I am working on a project 
> where a real controller and a TRNSYS project have to communicate with 
> each other. One of my problems right now is trying to force TRNSYS to 
> run on real-time so that the commands from/to the controller are 
> received at the appropiate time. If this is not possible, is there a 
> way in which TRNSYS can be externally paused after each TIME STEP and 
> restarted after receiving an external signal? (I figure this would be 
> another way of forcing the system to run on real-time).
> Thanks!
>
> -- 
> Santiago Naranjo Palacio
>
>
> _______________________________________________
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> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
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
http://www.trnsys.com

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