[TRNSYS-users] PID controller in TRNSYS developer
wangyang
yang.wang at unibw.de
Mon Nov 14 02:28:17 PST 2011
Dear all,
I have a question about PID controller in TRNSYS for its developer.
Which expert knows PID controller in TRNSYS developer? Or Which expert
could pass me the source code of PID controller or its internal algorithm
etc.? I guess PID controller in TRNSYS is based on empirical equation or
iterative algorithm. Since there is *very weird* simulation results i.e. I
set the set point CO2 concentration 1000 ppm as PID controller's set point;
its control signal links to Opening Factor (OF) of windows; indoor CO2
concentration links to PID's controlled variable. However, when indoor CO2
concentration is less than set point 1000 ppm, PID begins to activate OF
i.e. windows are open. But based on PID principle, as we know, if CO2
concentration is not getting to set point 1000 ppm, at this time windows
are open will result in *the ERROR* (between the set point and actual
indoor CO2 concentration)* increasing. *So I'm puzzled! Please PID
controller in TRNSYS developer or other experts explain this weird
phenomenon!
Many thanks in advance!
br
wang
2011/11/12 <trnsys-users-request at cae.wisc.edu>
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> Today's Topics:
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> 1. Re: (no subject) (David BRADLEY)
> 2. Re: TRNSYS3D Shading on Walls? (David BRADLEY)
> 3. Re: how to identify a wall that is adjacent two walls
> (David BRADLEY)
> 4. Error in reading type 51 external performance File
> (Walif M'kacher)
>
>
> ---------- 已转发邮件 ----------
> From: David BRADLEY <d.bradley at tess-inc.com>
> To: Erik Boschek <erikboschek at yahoo.com>
> Date: Fri, 11 Nov 2011 12:01:47 -0600
> Subject: Re: [TRNSYS-users] (no subject)
> Erik,
> You are right on with all three of your points. For reference, we
> discontinued use of Type109 in Trnsys17 in favor of option 2 (Type15),
> which is correct from an energy perspective even though it isn't a smooth
> curve. In gernal think that a control strategy that relies only on the
> instantaneous DNI as its input might run into trouble not only in
> simulation but also in the real world; clouds pass in front of the sun
> rapidly sometimes. While I won't pretend that the "spiky" profile that
> Type15 generates is totally realistic, I think it is a fairly accurate
> representation of DNI. Bear in mind that Type15 is trying to reconstruct a
> minute by minute radiation profile based only on 1 number and to do so
> correctly for all possible climate types. You might consider a control
> strategy that uses the output of Type15 but put through a running-average
> component so that your control decisions are based on a somewhat more
> stable (smoother) profile.
> Best,
> David
>
>
> On 11/11/2011 00:32, Erik Boschek wrote:
>
>
> Dear TRNSYS users,
>
> I have a simple question regarding weather reading and interpolating
> direct normal radiation (DNI) values for time steps less than an hour.
>
> As long as I have been using TRNSYS (using TRNSYS 16.1) I have understood
> this can be done in a few ways as follows, including the consequence for an
> example TM2 file (see attached screen shot for clarification):
>
> 1.) Do not interpolate, using Type 15 with output DNR (not interpolated):
> you end up with a "steppy" profile
> 2.) Using Type 15, but with 2-axis tracking and the output "Beam radiation
> for surface": you get a discontinuous "spikey" profile, but the integration
> of energy across the hour is respected
> 3.) Same as 2, but using Type109-TMY2: You get a smooth profile, but often
> there appear inexplicable spikes at the beginning or end of the day. The
> one in the plot obviously is an extreme case.
>
> For reference: I just used the Daggett profile "US-CA-Daggett-23161.tm2"
> which came with TRNSYS, but the behavior is not specific to this file.
>
> Generally, I have been using 2, but it can cause problems if there is, for
> example, some triggering function based on DNI and the DNI hovers around
> the threshold. Is there another option for getting a smoother profile or is
> it best just to not interpolate? Any opinions? Feel free to point me to an
> earlier post on this topic in case I missed it.
>
> Thanks,
>
> Erik Boschek
>
>
>
>
>
>
>
>
> _______________________________________________
> TRNSYS-users mailing listTRNSYS-users at cae.wisc.eduhttps://mailman.cae.wisc.edu/listinfo/trnsys-users
>
>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI 53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
>
>
>
> ---------- 已转发邮件 ----------
> From: David BRADLEY <d.bradley at tess-inc.com>
> To: Marion Hiller <hiller at transsolar.com>
> Date: Fri, 11 Nov 2011 12:03:16 -0600
> Subject: Re: [TRNSYS-users] TRNSYS3D Shading on Walls?
> TRNSYS-users,
> My apologies; my reply to Graham was incorrect; as Marion says, only the
> windows are affected.
> Kind regards,
> David
>
>
> On 11/11/2011 01:33, Marion Hiller wrote:
>
>> Graham,
>>
>> the shading defined in Trnsys3D effects only windows.
>>
>> Marion
>>
>> Dipl.-Ing. Marion Hiller
>> TRANSSOLAR: KlimaEngineering - Technologien für energieeffizientes Bauen
>> und Nutzerkomfort in Gebäude
>> Munich - New York - Stuttgart + 49.711.67976.0
>>
>> Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart
>> Amtsgericht Stuttgart - HRB 23347, Steuernummer 99073/00911, USt-IdNr.:
>> DE152272639
>> Geschäftsführer: Dipl.Ing. Matthias Schuler, Dipl.Ing. Thomas Auer,
>> Dipl.Phys. Stefan Holst, Prof. Dipl.-Ing. Bleicher
>>
>>
>>
>> -----Ursprüngliche Nachricht-----
>> Von: Graham Linn [mailto:grahamjlinn at gmail.com]
>> Gesendet: Donnerstag, 10. November 2011 21:49
>> An: trnsys-users at cae.wisc.edu
>> Betreff: [TRNSYS-users] TRNSYS3D Shading on Walls?
>>
>> Hello TRNSYS users,
>>
>> I have a question about shading in TRNSYS3D. Does a shading object
>> affect how much insolation hits the entire building or just the
>> windows on the building?
>>
>> Thank you!
>> Graham
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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
> http://www.trnsys.com
>
>
>
>
> ---------- 已转发邮件 ----------
> From: David BRADLEY <d.bradley at tess-inc.com>
> To: Nidal Abdalla <nidalabdalla at yahoo.com>
> Date: Fri, 11 Nov 2011 12:29:48 -0600
> Subject: Re: [TRNSYS-users] how to identify a wall that is adjacent two
> walls
> Nidal,
> You have to be a little careful here. If you have a wall in zone 1, half
> of which is adjacent to zone 2 and half of which is adjacent to zone 3, you
> actually need to draw the wall as two walls in zone 1. Trnsys3D requires
> the user to be quite vigilant about manually setting adjacencies. You need
> to draw the ADJACENT wall in both zones and you need to open the object
> window for each of them, set the construction to ADJ_WALL, set the "outside
> boundary condition" to "Zone" and then manually select the zone to which it
> is adjacent in the "outside boundary object" field.
>
> If you have been very careful about drawing your ADJACENT walls so that
> they have exactly the same verticies in both zones to which they belong,
> you can then select the menu item: Plugins: Trnsys3d: Surface Matching and
> click the "match in entire model" button.
>
> Kind regards,
> David
>
>
> On 11/11/2011 08:32, Nidal Abdalla wrote:
>
> I drew a house using Trnsys3d that consists of: 3 bed rooms, living
> room, guest room and bath . The house was divided into 6 zones. Wall_zone5,
> for example, is adjacent two walls for two different zones. I am wondering
> how to identify a wall (using Object Info) that is adjacent two or more
> walls of diff. zones.
>
> Best Regards
>
> Nidal Abdalla
>
>
>
> _______________________________________________
> TRNSYS-users mailing listTRNSYS-users at cae.wisc.eduhttps://mailman.cae.wisc.edu/listinfo/trnsys-users
>
>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI 53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
>
>
>
> ---------- 已转发邮件 ----------
> From: "Walif M'kacher" <walif.mkacher at gmail.com>
> To: trnsys-users at cae.wisc.edu
> Date: Sat, 12 Nov 2011 15:13:05 +0100
> Subject: [TRNSYS-users] Error in reading type 51 external performance File
>
> Dear TRNSys Users,****
>
> ** **
>
> I have a problem with external file of type 51a (cooling tower with an
> external performance File):
>
> **
>
>
> That the simulation with this type causes error and this can't read this
> external file (.txt)
>
>
>
> Would you please help me how to correct the file joined or send me a truth
> format of this .txt file
>
>
> ** **
>
> Many thanks in advance****
>
> **
>
> *Mkacher Walif*
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users
>
>
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