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 D0 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-01What'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@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@h3c-energies.fr>
To: trnsys-users@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@h3c-energies.fr
-----------------------------
H3C-énergies
35, chemin du vieux Chêne - 38240 MEYLAN
Tél : 04 76 41 88 66 – Fax : 04 76 41 28 94
-----------------------------------------------------------------------------------
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---------- 已转发邮件 ----------
From: "hotline" <hotline@transsolar.com>
To: "julia.feste" <julia.feste@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@transsolar.com
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@whitepavilion.com.cn]
Gesendet: Mittwoch, 3. November 2010 06:46
An: trnsys-users@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@cae.wisc.edu
[trnsys-users-request@cae.wisc.edu]
Sent: Wednesday, November 03, 2010 1:04 AM
To: trnsys-users@cae.wisc.edu
Subject: TRNSYS-users Digest, Vol 71, Issue 4
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---------- 已转发邮件 ----------
From: "Emiliano Casati - 3ME" <E.I.M.Casati@tudelft.nl>
To: <trnsys-users@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@tess-inc.com>
To: "Thibaut VITTE" <thibaut.vitte@h3c-energies.fr>, trnsys-users@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@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@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
-----------------------------------------------------------------------------------
Afin de contribuer au respect de l'environnement,
merci de n'imprimer ce message qu'en cas de nécessité.
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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@tess-inc.com http://www.tess-inc.com http://www.trnsys.com