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Hi Marcello,
I’m not the top expert for the physics part of
COMIS, so maybe someone else wants to add some information, but here is what I
know:
1) Zoning will be different most of the time actually. For example, you
will often times model ventilation boxes, ductwork and such. For this you will
need additional air nodes. You may also want a more detailed air flow model
than for the thermal side, or vice versa (a classical example are double
facades, see http://software.cstb.fr/IISIbat/empa/ZTL_DF/ZTL_DF.HTM
)
2) These are the standard only the most often used connections. You may
want to use other variables from COMIS, based on the goal of your studies.
3) One source is AIVC ; a part of AIVC data is contained in the
Simulation Studio, under Aivc (tree on the right side when a COMIS project (*.cpf)
is active). You can also get data from http://www.aivc.org/
A big classical are Technotes 44 and of course
4) Any opening, fan, etc. can have a schedule or be driven by a TRNSYS output
variable or equation. To use this feature, have to modify the ‘Actual
value’ of the component: Set the “Number of links with schedules”
(parameter #2 of type 157) to the number of elements you want to change
dynamically. An additional input is added to type 157 for each such value
(called 'actual value' in the COMIS manual). They are defined in the order of
links in the COMIS Input File (CIF) under &-NET-LINKS.
HTH,
Werner
De :
comis@yahoogroups.com [mailto:comis@yahoogroups.com] De la part de Marcello
Envoyé : lundi
À : comis@yahoogroups.com
Objet : [comis] Basic
practical information about COMIS
Dear COMIS users,
I am a beginner user of energy and airflow simulation programs. I
studied theoretically how the different models works (in particular
TRNSYS and COMIS), as I am phD student since October. I finally
decided that it is the moment to pass to the practice.
Before to begin, I would like to receive from you some practical tips
about the following subjects:
1) Thermal and airflow zoning: practically, do they always coincide?
If not, is it possible to do different zoning in TRNSYS and COMIS and
link them? In other words, is it possible to have in COMIS a unique
zone, correspondent to a thermal zone, with an internal partition, or
it is necessary to create two connected airflow zones?
2) Linking TRNSYS and COMIS: I tried to create a coupled project. By
default, Simulation studio links the thermal and airflow model
connecting zone temperatures and airflow rates. Is it the only link
necessary? Is it necessary sometimes to change this connection?
3) Cd of opening: does it exist a database of Cd coefficients for
different openings? I read that Cd coefficient fall generally into the
range 0,6 – 1, but I did not found many precise values.
4) Opening area: can external openings be scheduled depending on
external temperature or wind? And how to do for internal opening?
I thank everyone who will have the kindness to answer, even partially,
to my basic questions.
Best regards,
Marcello Caciolo
phD student
Ecole de Mines de Paris
marcello.caciolo@
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