[TRNSYS-users] Matched flow control for solar collector

[David BRADLEY]

Muthalagappan Narayanan,
   Type539 contains a control mode input that allows it to internally 
compute the flow rate required in order to achieve a desired outlet 
temperature. The desired flow rate can then be passed to an equation to 
turn it into a control signal to be passed to the pump that is actually 
delivering the flow to the collector. This way the collector gets the 
flow that it needs in order to maintain the desired outlet temperature. 
If I am mistaken in understanding what you are trying to do, please let 
me know.
kind regards,
  David



On 04/12/2016 09:47, Muthalagappan Narayanan wrote:
> Hello all,
>
> I am simulating a solar thermal system and we would like to have a 
> matched flow control strategy. For this, I tried with type 539 
> collector and also with type 23 PID, but anyway I could not achieve 
> it. When I use PID, the set point is being checked with the collector 
> outlet temperature and the control signal is sent to the variable pump 
> and during the simulation I only see repeated oscillations between 
> minimum and maximum control signal value. I just PI controller and I 
> tried almost all the possibilities, I know. It would be great if 
> someone has already implemented matched flow control for the collector 
> and could help me out for a solution or share their ideas. Thanks
>
> With Regards
> Muthalagappan Narayanan
> Hochschule Ulm, Germany
>
>
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-- 
***************************
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
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