David and Joke, the coupling airflows between
two airnodes belonging two different zones are defined by adjacent surfaces
(walls/windows). Coupling airflows between
two airnodes of the same thermal zone can be defined in the regime. A new
button coupling becomes active. Concerning the false
ceiling problem of Joke, do you use the detailed radiation modes? I assume not because you
do have a shading and the distribution isn’t that important anymore,
right? If you use standard
radiation mode I suggest that your airnode “false ceiling”
doesn’t cover the whole Ceiling area, but only 70
%. The remaining separating vertical surface between the airnode false ceiling
and room could be defined as a
resistance wall with a high conductivity. Virtual surfaces are
defined in Trnsys3D, but they don’t exist in the thermal model. Thus no
heat transfer through the virtual surface can be calculated.
Virtual surfaces are defined for creating closed volumes for airnodes such that
the volume calculation of the airnode is performed correctly. Best, Dipl.-Ing.
Marion
Hiller Geschäftsführer:
Dipl.Ing. Matthias Schuler, Dipl.Ing. Von: David BRADLEY [mailto:d.bradley@tess-inc.com] Joke, David, Thanks for the answer. But the problem is that it isn't a
100% false ceiling but about 70%. So what do I do with the "air - air contact"
between the two zones. Does Trnsys takes this into account when I model it with a
virtual surface in google sketchup or do the airnodes then have to belong to
the same thermal zone? Greetings, Joke Van: David
BRADLEY [d.bradley@tess-inc.com] Joke, Dear all, Can anyone help me what’s the
best way to simulate a suspended false ceiling? The goal is to simulate a class room
where the comfort is assured by using night ventilation. However for acoustic
reasons we need a false ceiling. I want to know the percentage of
suspended false ceiling is possible in order to have still enough inertia from
the concrete ceiling. Is the best way just to define two
different types of ceiling (1. A concrete ceiling and 2.a false ceiling
(concrete + air layer + false ceiling)) or has anyone another idea? Is it possible to draw for example some
obstructions in Google sketch up and then to define 3 air nodes in trnsys. One
air node above the suspended false ceiling; one air node in the middle of the
room and one air node representing the opening window? Will it take into account the less
availability of the inertia of the concrete ceiling? Hoping for an answer, Joke De Beuckelaer project engineer mep VK HEALTHCARE | BUILDINGS | INDUSTRY |
INFRA Value
by design
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ALWAYS LOOKING FOR GREAT PEOPLE ****DISCLAIMER**** -- *************************** 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 |