Re: [TRNSYS-users] PID controller

["Mario Leroy Ortiz" <ortizm@unm.edu>]

Max Werlein,

Type 22 iterative feed back controller is much easier to 
work with.  Also, when using controllers, I have found 
that the controller usually behaves better if it is after 
the modules that are in the loop that it is controlling. 
So under control cards/ component order, put your 
controller after your pump, tank, pipes and solar 
collectors.  Lastly, put modules in the component order 
tab in the order of the flow, starting maybe at the tank 
or some other logical place.

Thank you,

Mario Ortiz

On Wed, 15 Oct 2008 13:08:44 +0200
 Max Werlein <maxwithhat@hotmail.com> wrote:
> Dear TRNSYS users,
>
> I have a solar collector with a constant area, feeding 
> its outputflow to a storage tank. Cold water leaves the 
> tank through a pump (variable speed type 10) and feeds 
> the collector. I now want to use a PID controller (or 
> feedback controller) so as to regulate the outlet 
> temperature of the collector to lets say 90 ºC by varing 
> the input flowrate of the collector, hence controlling 
> the variable speed pump. This does not seem to work, 
> whereas testin the PID conroller (without Tank) i found 
> out that I can control the collector inlet temperature 
> for a constant  area and flowrate trough the collector. 
> But controlling a temperature by variing the flowrate 
> sonhow does not work.
> Maybe anyone has any suggestions?
>
> Thanks and kind regards
>
> max
>
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