[TRNSYS-users] How to calculate the zone thermal time constant & air volume flow of opening
David BRADLEY
d.bradley at tess-inc.com
Wed Nov 3 10:19:45 PDT 2010
Wang,
The thermal time constant for a zone in your building is not a simple
thing to compute. It has to do with the materials in the wall, the
placement of the mass within the wall, the capacitance of the zone,
ventilation, infiltration, gains, solar radiation, etc. I would think
that the easiest way to get an estimate of the zone's thermal time
constant is to impose a step change in one input on it - step change the
ambient temperature while holding all other inputs constant for example.
The numbers that you see in the *.inf file are transfer function
coefficients. You can read in the ASHRAE Handbook of Fundamentals about
the Conduction Transfer Function methodology.
Regards,
David
On 11/3/2010 09:29, 王洋 wrote:
> Dear all,
> 1. How to calculate or find the thermal time constant of zone in
> TRNSYS software?
>
> ---------- WALL TYPE BST_FL_HEAT_W1 ----------
>
> THERMAL CONDUCTANCE, U= 67.80000 kJ/h m2K; U-Wert=
> 4.48235 W/m2K
> (incl. alpha_i=7.7 W/m^2 K and alpha_o=25 W/m^2 K)
>
> TRANSFERFUNCTION COEFFICIENTS
> K A B C D
>
> 0 1.7050117E+02 2.1087019E+01 1.7050117E+02
> 1.0000000E+00
> 1 -1.1800059E+02 3.5808933E+01 -1.1800059E+02
> -1.3683139E-01
> 2 6.0267372E+00 1.6298573E+00 6.0267372E+00
> 4.7362566E-05
> 3 -1.2736107E-03 2.3363784E-04 -1.2736107E-03
> SUM 5.8526043E+01 5.8526043E+01 5.8526043E+01
> 8.6321597E-01
>
> What's meaning of A B C D? Are they Wall's TRANSFERFUNCTION
> COEFFICIENTS? And what is the thermal time constant of the whole zone?
> How to calculate or find the thermal time constant of the whole zone
> in TRNSYS software?
> Need I calculate by myself the whole zone's TRANSFERFUNCTION based
> on all the walls of the zone or others?
> 2. How to calculate or find air volume flow of the window opening in
> TRNFlow software?
> The window opening area (m2)is known. Whether it needs the wind
> speed(m/s) or not?
> Many thanks!
> Br.
> wang
> 2010/11/3 <trnsys-users-request at cae.wisc.edu
> <mailto:trnsys-users-request at cae.wisc.edu>>
>
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> Today's Topics:
>
> 1. Re: GenOpt optimization: problem for the second generation
> after 5 simulations (Thibaut VITTE)
> 2. Re: google sketchup+trnsys3d (hotline)
> 3. input file (Emiliano Casati - 3ME)
> 4. Re: GenOpt optimization: problem for the secondgeneration
> after 5 simulations (Timothy McDowell)
>
>
> ---------- 已转发邮件 ----------
> From: Thibaut VITTE <thibaut.vitte at h3c-energies.fr
> <mailto:thibaut.vitte at h3c-energies.fr>>
> To: trnsys-users at cae.wisc.edu <mailto:trnsys-users at cae.wisc.edu>
> Date: Wed, 03 Nov 2010 11:27:53 +0100
> Subject: Re: [TRNSYS-users] GenOpt optimization: problem for the
> second generation after 5 simulations
> Dear Alexis,
>
> I've had a similar error when I used Genopt. I've had several
> components tracked by a "trace" command that made my list file
> enormous (more than 100Mb) and genopt could'nt handle that amount
> of data.
>
> Just my 2cents.
>
> Thibaut
> --
>
> Le futur maîtrisé
>
>
>
>
> Thibaut VITTE
>
> Docteur - Ingénieur Energies
>
> Mail : thibaut.vitte at h3c-energies.fr
> <mailto:thibaut.vitte at h3c-energies.fr>
>
> -----------------------------
>
> H3C-énergies
>
> 35, chemin du vieux Chêne - 38240 MEYLAN
>
> Tél : 04 76 41 88 66– Fax : 04 76 41 28 94
>
> www.h3c-energies.fr <http://www.h3c-energies.fr/>
>
>
>
> -----------------------------------------------------------------------------------
>
> Afin de contribuer au respect de l'environnement, merci de
> n'imprimer ce message qu'en cas de nécessité.
>
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>
>
> ---------- 已转发邮件 ----------
> From: "hotline" <hotline at transsolar.com
> <mailto:hotline at transsolar.com>>
> To: "julia.feste" <julia.feste at whitepavilion.com.cn
> <mailto:julia.feste at whitepavilion.com.cn>>
> Date: Wed, 3 Nov 2010 11:37:08 +0100
> Subject: Re: [TRNSYS-users] google sketchup+trnsys3d
> Hi,
>
> that's a well known problem that will be fixed in the next version.
> Hopefully upcoming within the next weeks.
>
> Regards
> Christian
>
> TRANSSOLAR Software Team
> hotline at transsolar.com <mailto:hotline at transsolar.com>
>
> www.trnsys.de <http://www.trnsys.de/>
> Transsolar KlimaEngineering - Technologien für energieeffizientes
> Bauen
> und Nutzerkomfort in Gebäuden
> Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart /
> Amtsgericht Stuttgart - HRB 23347 / USt-IdNr.: 99073/00911
> Geschäftsführer: Dipl.Ing. Matthias Schuler, Dipl.Ing. Thomas Auer,
> Dipl.Phys. Stefan Holst, Prof. Volkmar Bleicher
>
> -----Ursprüngliche Nachricht-----
> Von: julia.feste [mailto:julia.feste at whitepavilion.com.cn
> <mailto:julia.feste at whitepavilion.com.cn>]
> Gesendet: Mittwoch, 3. November 2010 06:46
> An: trnsys-users at cae.wisc.edu <mailto:trnsys-users at cae.wisc.edu>
> Betreff: [TRNSYS-users] google sketchup+trnsys3d
>
>
> Hello everybody,
> Thanks for your posts that's always really interesting!
> I come up with a problem using Google Sketchup and TRNSYS3D: inside a
> TRNSYS zone, I draft a square, then I want to pull it up at a certain
> height, so I write the number then Enter, and this error appears:
>
> <-----Beginning of the error----->
> ERROR:
> NoMethodError
> undefined method `position' for
> #<Sketchup::AttributeDictionary:0xfcb4eb8>
>
> BACKTRACE:
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/sketchup/Sketchup.rb:309:in `polygon_loop'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/sketchup/Sketchup.rb:309:in `each'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/sketchup/Sketchup.rb:309:in `polygon_loop'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/sketchup/Sketchup.rb:321:in `outer_polygon'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/sketchup/Sketchup.rb:326:in `polygon'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/interfaces/DrawingUtils.rb:27:in
> `detect_base_face'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/interfaces/DrawingUtils.rb:20:in `each'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/interfaces/DrawingUtils.rb:20:in
> `detect_base_face'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/interfaces/BaseSurface.rb:254:in `face_polygon'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/interfaces/BaseSurface.rb:253:in `each'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/interfaces/BaseSurface.rb:253:in `face_polygon'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/interfaces/Surface.rb:107:in
> `update_input_object'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/interfaces/BaseSurface.rb:94:in
> `update_input_object'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/interfaces/DrawingInterface.rb:353:in
> `on_change_entity'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/observers/FaceObserver.rb:32:in
> `onChangeEntity'
> C:/Program Files/Google/Google SketchUp
> 8/Plugins/Trnsys3d/lib/AsynchProc.rb:17:in `initialize'
>
> <-----End of the error----->
>
> When I pull it up manual, I don't have any problem, just when I write
> the number.
>
> Thanks in advance for your help,
> Julia.
> ________________________________________
> From: trnsys-users-request at cae.wisc.edu
> <mailto:trnsys-users-request at cae.wisc.edu>
> [trnsys-users-request at cae.wisc.edu
> <mailto:trnsys-users-request at cae.wisc.edu>]
> Sent: Wednesday, November 03, 2010 1:04 AM
> To: trnsys-users at cae.wisc.edu <mailto:trnsys-users at cae.wisc.edu>
> Subject: TRNSYS-users Digest, Vol 71, Issue 4
>
> Send TRNSYS-users mailing list submissions to
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>
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>
> When replying, please edit your Subject line so it is more
> specific than
> "Re: Contents of TRNSYS-users digest..."
>
> _______________________________________________
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>
>
>
>
>
>
> ---------- 已转发邮件 ----------
> From: "Emiliano Casati - 3ME" <E.I.M.Casati at tudelft.nl
> <mailto:E.I.M.Casati at tudelft.nl>>
> To: <trnsys-users at cae.wisc.edu <mailto:trnsys-users at cae.wisc.edu>>
> Date: Wed, 3 Nov 2010 13:19:58 +0100
> Subject: [TRNSYS-users] input file
>
> Hi to everybody!
>
> I don’t understand why, for certain projects, I can’t open the
> input file, the message is “the system cannot find the path
> specified”.
>
> Where should I find the input file?
>
> Thanks a lot
>
> ec
>
>
>
> ---------- 已转发邮件 ----------
> From: "Timothy McDowell" <mcdowell at tess-inc.com
> <mailto:mcdowell at tess-inc.com>>
> To: "Thibaut VITTE" <thibaut.vitte at h3c-energies.fr
> <mailto:thibaut.vitte at h3c-energies.fr>>, trnsys-users at cae.wisc.edu
> <mailto:trnsys-users at cae.wisc.edu>
> Date: Wed, 3 Nov 2010 07:23:05 -0500 (CDT)
> Subject: Re: [TRNSYS-users] GenOpt optimization: problem for the
> secondgeneration after 5 simulations
> This type of error in GenOpt is usually caused by an error in the
> TRNSYS
> simulation. You need to check the *.lst file for the TRNSYS run
> to see
> what the TRNSYS error is.
>
> Regards,
>
> Tim
>
>
>
>
>
> ----------------------------------
> Timothy McDowell
> Executive Vice President
> Thermal Energy System Specialists, LLC
> 22 N. Carroll St, Suite 370
> Madison, WI 53703
> Phone: 608-274-2577
> Fax: 608-278-1475
>
> ----- Original Message -----
> From: "Thibaut VITTE" <thibaut.vitte at h3c-energies.fr
> <mailto:thibaut.vitte at h3c-energies.fr>>
> Sent: Wed, November 3, 2010 5:27
> Subject:Re: [TRNSYS-users] GenOpt optimization: problem for the
> secondgeneration after 5 simulations
>
>
>
>
>
>
>
>
>
> Dear Alexis,
>
> I've had a similar error when I used Genopt. I've had several
> components tracked by a "trace" command that made my list file
> enormous (more than 100Mb) and genopt could'nt handle that
> amount of
> data.
>
> Just my 2cents.
>
> Thibaut
> --
>
>
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>
>
>
>
>
>
>
>
>
> Le futur maîtrisé
>
>
>
>
>
>
>
> Thibaut VITTE
> Docteur - Ingénieur Energies
> Mail : thibaut.vitte at h3c-energies.fr
> <mailto:thibaut.vitte at h3c-energies.fr>
>
> -----------------------------
> H3C-énergies
> 35, chemin du vieux Chêne - 38240 MEYLAN
> Tél : 04 76 41 88 66 – Fax : 04 76 41 28
> 94
> www.h3c-energies.fr <http://www.h3c-energies.fr/>
>
>
>
>
>
>
>
>
> -----------------------------------------------------------------------------------
> Afin de contribuer au respect de l'environnement,
> merci de n'imprimer ce message qu'en cas de nécessité.
> In order to respect the environment, please don't
> print this e-mail unless you really need to.
>
>
>
>
>
>
> _______________________________________________
> TRNSYS-users mailing list
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>
> ----- End of original message -----
>
>
>
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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
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