[TRNSYS-users] TRNSYS 17-TRNBuild - multiple airnodes...

[hotline]

Hi,
 
1) please have a look to the Trnsys3d Tutorial at page 20. There is a
picture at the bottom that shows in what case you'll use the virtual
surface. Normally this wall type is used if you want to simulate
stratification effects like in wintergardens,... By this you could for
example have a radiative zone (means all walls are in radiation
exchange) with several AIRNODES inside. The virtual surface is just a
seperator of these Airnodes that will be deleted after importing into
TRNBUILD.  
2) If you use Trnsys3d you'll at first define all walls in the 3D
geometry. These definitions for walls and windows will remain in
TRNBUILD. If you have AIRNODES defined for a radiative zone then the
REGIME DATA is splitted up into two parts, the REGIME DATA for the
specifique AIRNODES (like heating, cooling,...) and the REGIME DATA for
the radiative zone (like GEOMETRY MODE,...).
3) Normally if you have two zones that are linked by an ADJACENT WALL
you can define a COUPLING in TRNBUILD if you select these walls (like
defining a GEOSURF or WALLGAIN). But you have to consider that couplings
can only be in a positive direction. This means that for example if you
are in the definition of zone A you can define a COUPLING from zone B
with xxx kg/h air flow. If you want an air flow the other way then you
have to be in the definition of zone B and to define a COUPLING from
zone A... A special case is if you have a virtual surface between
AIRNODES because this will be thrown out and so you have no wall to
define a coupling. For this reason there is a new button called COUPLING
in the REGIME DATA of the AIRNODES. There you can make the same
definitions as for walls.
 
Regards
Christian
 
TRANSSOLAR Software Team
hotline at 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
 

  _____  

Von: aongya.sumaila at lte.ireq.ca [mailto:aongya.sumaila at lte.ireq.ca] 
Gesendet: Montag, 13. September 2010 15:49
An: trnsys-users at cae.wisc.edu
Betreff: [TRNSYS-users] TRNSYS 17-TRNBuild - multiple airnodes...



Hello,
 
I recently started to explore TRNSYSv17 and I got a few unanswered
questions about TRNBuild. Hopefully, someone of you will be able to help
me on this.
I'm using TRNSYS3D plug-in for Google SketchUp to create 3D Multizone
buildings and I import them in TRNBuild to add the regime data,
equipments...I also worked a bit with the Multizone Building tutorial
example called 'Restaurant'.
 
1- In a practical sense, what means 'Virtual Surface'? What are the
properties of this type of wall? What are the cases in which it is used?
2- If we create a new airnode in a zone, do we have to redefine all the
building surfaces or they are assigned by default? Same thing but with
the regime data, is it assigned to all the new airnodes in a zone or
just to one by default? 
3- In the restaurant example that I tried to recreate, there is a
convective coupling between airnodes in two differents zones. How is it
possible to do that?
 
Thanks in advance for any help you can provide!
 
 
Sumaila
Laboratoire des technologies de l'énergie (LTE)
600, avenue de la Montagne
Shawinigan, QC, G9N 7N5
Tel: 819-539-1400 poste 1340
Courriel: aongya.sumaila at lte.ireq.ca
 


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