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RE: [EnergyPlus_Support] Airflow in COMIS

Out of curiosity, could we not roughly model stratification by separating
the staircase (to use Daniel's example) into zones for each level as Daniel
suggests,  then model a "dummy" wall between the zones with the same size
"dummy" door or window with no heat transfer resistance?  Besides neutral
temperature airflows (pressure effects), does COMIS account for temperature
effects (warm air rising)?

-----Original Message-----
From: Frederick C. Winkelmann [mailto:FCWinkelmann@xxxxxxx]
Sent: Thursday, September 19, 2002 3:25 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx; daniel.grunbaum@xxxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Airflow in COMIS


Neither EnergyPlus by itself nor the COMIS program in EnergyPlus can be
used to model temperature stratification in zones. You will probably
have to use a CFD program to do this.
There is a link between EnergyPlus and MITCFD, a CFD program developed
at MIT. As far as I know this link is not available yet, but you might
send email to Philip Haves at LBNL to see if you can get a hold of a
test version of EnergyPlus/MITCFD. Philip's email address is

By the way, zones in COMIS can also be linked by cracks in interior
walls, as well as windows and doors.

Fred Winkelmann
Daniel Grunbaum wrote:

>  I am trying to simulate a naturally ventilated and building and am
> using the COMIS link. It appears as though COMIS needs all zones
> linked via openings (windows or doors) in order for it to work.If this
> is the case, how can I simulate airflow between zones that are not
> separated by a wall. For example, I want to simulate a staircase and I
> want each level of the staircase to be a zone so that I can determine
> if there is going to be over heating problems in the staircase at the
> top level. At the moment the only way I can get COMIS to work is by
> simulating the staircase as one zone which results in the zone
> temperature being the average occurring across all levels of the
> staircase.

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