[TRNSYS-users] Request

[Samuele Mazzei]

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 at itf.biz> To: ozzysam at hotmail.com> CC: trnsys-users at 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.> > > > ------------------------------------------------------------------------> >> > _______________________________________________> > TRNSYS-users mailing list> > TRNSYS-users at engr.wisc.edu> > https://www.cae.wisc.edu/mailman/listinfo/trnsys-users> > > > -- > > ***************************************************************> 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> Website: www.itf.biz> Mail : a.jezequel at itf.biz> > 
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