Re: [TRNSYS-users] Request

[Samuele Mazzei <ozzysam@hotmail.com>]

Dear Adrien,
 
I have seen in example PID-Cooling-Flowrate that the control signal is used to modulate the cold-side flowrate; so I think it can be used in this way.
 
In my model, I don't understand why the outlet temperature ( first of all the outlet flowrate) from the collector has such big oscillations and it 's not fixed at 280°C.
 
Any advices are accepted. Thanks.
 
 
 


> Date: Wed, 2 May 2007 17:05:23 +0200
> From: a.jezequel@itf.biz
> To: ozzysam@hotmail.com
> CC: trnsys-users@engr.wisc.edu
> Subject: Re: [TRNSYS-users] Request
> 
> Dear Samuel,
> 
> If you see the example concerning the use of PID, you will see that the 
> PID output 1 ('control signal') is defined as an energy (in kJ/hr) used 
> to heat or cool the building. So I think that you have to adapt the PID 
> output with an equation to obtain a fluid flow rate.
> 
> I think that tPiD only give the energy rate necessary to maintain the 
> controled variable at the setpoint.
> 
> Maybe you can have a look at this example in "feedback control" to see 
> how are used PID.
> 
> I am not really sure of what I say, so if someone is able to confirm or 
> to cancel what I said, he's welcome...
> 
> Best regards,
> 
> Adrien
> 
> Samuele a écrit :
> > Dear all,
> > 
> > I'm trying to build a model in which there are a variable speed pump 
> > and a linear parabolic concentrator: I'm using a pid controller to 
> > regulate the inlet flowrate for the liner parabolic concentrator 
> > because I need that the outlet temperature from the concentrator is 
> > costant ( 280°C).
> > 
> > I have seen the result but I don't know if it's working well. There is 
> > the file.tpf enclosed.
> > 
> > Could anybody tell me if anything is wrong?
> > 
> > Thanks in advance.
> > 
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> 
> -- 
> 
> ***************************************************************
> Adrien JEZEQUEL 
> Ingénieur en Simulations Dynamiques
> ITF (Ingénierie Tous Fluides)
> 87, route de Chambéry
> 73230 ST ALBAN EN LEYSSE
> FRANCE
> Tel: 04.79.75.00.29
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> Mail : a.jezequel@itf.biz
> 
>

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