[TRNSYS-users] calling sequence

[David Bradley]

Thibaut,
  I think you need to use the storage structures (getStorageVars() and 
setStorageVars()). I am not sure that I have completely understood what 
you are trying to do but I think that what you want to do is store 2 
values in the global storage structure. One of those values is the final 
calculated temperature of the last time step and the other one is the 
calculated temperature of the last iteration. Each time you enter the 
Type on an iterative call, you can call getStorageVars() and base your 
calculations on the final temperature of the previous time step. At the 
end of your calculations during an iterative call, you call 
setStorageVars() and update ONLY the calculated value of the last (just 
completed) iteration. Then, after convergence has been reached, you call 
getStorageVars(), retrieve the value that you calculated at the end of 
the last iteration and replace the value of the final calculated 
temperature at the end of the time step. Then call setStorageVars() 
again. Again, I may be misinterpreting what you are trying to do but 
hopefully the above is close enough that you can figure out how to make 
getStorageVars() and setStogageVars() to work appropriately for your 
situation.
Kind regards,
 David



> Dear Trnsys users,
>
> I am modelling a setpoint that is drifting inside a dwelling (17-23°C 
> for instance).
> So I use an iterative feedback controller, with upper and lower 
> setpoints, which minimize abs(Qheat)+abs(Qcool). It works very weel.
>
> Now I am writing a type, that controls (+/-1°C per week for instance) 
> that temperature 's drift. But to get the iterative feedback controller 
> working, I must not limit its output during the iterations, otherwise 
> the results are not consistent. So I thought I couls let the outputs 
> inchanged in the iterative calls (info(13)=0) and change them in the 
> post convergence call.
>
> e.g.
>
> /Perform any after iteration.../
> if(info(13)>0
> Tout=Tin+.../
> Limitation de la vitesse de dérive/
> endif
>
> /this is an iterative call.../
> if(info(13)=0
> Tout=Tin
> endif
>
> out(1)=Tout
>
>
> Obviously, this isn't working, I get the input temperature as an output 
> at every call, without any modification at the post-convergence call. Is 
> it possible? Am I getting something wrong?
>
> Thanks in advance for your help
>
> Thibaut Vitte
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> TRNSYS-users at cae.wisc.edu
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>   

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Thermal Energy System Specialists (TESS), LLC 
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