[bldg-sim] Current state of software for natural ventilation

[Joe Llona]

We have been using Tas for bulk airflow analysis and 2D CFD at
individual room level.  The space temperatures that we got out of the
bulk airflow analysis matched the actual building temperature
measurements pretty closely when modeled against similar climatic
conditions.  

We have not tried to use it for energy simulation yet, though.  I'd be
really interested in hearing if anyone has done that and how it went.

Joe Llona, P.E., LEED(r) AP
Director of Sustainable Design
CDi Engineers
Phone (425) 672-1071
Fax (425) 778-8769
E-mail jllona at cdiengineers.com




> -----Original Message-----
> From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf 
> Of Aizaz Aamir Samuel
> Sent: Monday, January 23, 2006 8:40 AM
> To: bldg-sim at gard.com
> Cc: bldg-sim at gard.com
> Subject: [bldg-sim] Current state of software for natural ventilation
> 
> A tool to use for natural and mixed-mode ventilation studies 
> that I have found useful is the nodal model integrated with 
> CFD available within ESP-r. The algorithm allows nodal 
> analysis of the whole building and CFD analysis of a specific 
> part of it so that both CFD and nodal model converge to the 
> same solution.
> 
> -Aizaz
> 
> Quoting Matt Gangemi <mgangemi at WoodHarbinger.com>:
> 
> > How well does COMIS work for natural ventilation?  My 
> understanding is 
> > that it's a nodal model and doesn't take the detailed room geometry 
> > into account (though my understanding is only based on a 
> few hours of 
> > research).  Will a CFD model be advisable in addition in 
> order to look 
> > at the boundary conditions?
> > 
> > 
> > 
> > > Drury.Crawley at EE.DOE.GOV
> > >=20
> > >=20
> > > DesignBuilder, a full-featured GUI for EnergyPlus  was released 
> > >earlier this week.  It can handle  the natural ventilation (COMIS) 
> > >parts of EnergyPlus.
> > > www.DesignBuilder.co.uk
> > >=20
> > > Mixed mode ventilation is planned for the April  release of 
> > >EnergyPlus.
> > >=20
> > >=20
> > >=20
> > >=20
> > >                       "Matt Gangemi"
> > >=20
> > > I'm interested in finding good software to use in designing for
> > natural
> > > ventilation.  By "good" I mean providing results accurate 
> enough to
> > use in
> > > constructing functional buildings, while being minimally 
> complex or 
> > > difficult to use (and yes, I'm aware that even the minima of this
> > group
> > > could suck up weeks/months of time) and yet still 
> affordable.  I've 
> > > searched the archives for a good discussion regarding natural
> > ventilation,
> > > and although I found a good thread ( 
> > > http://www.gard.com/ml/bldg-sim-archive/msg01276.html), it's a few
> > years
> > > old.
> > >=20
> > >=20
> > > What software is preferred?  Has anyone here tried the COMIS
> > capabilities
> > > of EnergyPlus?  Is there a good interface to EnergyPlus 
> yet?  (last
> > time I
> > > simulated a model was a few years ago, and I more or less worked 
> > > with
> > text
> > > files)  Is combining ESP-r with a CFD model still the 
> best solution,
> > or is
> > > there a better way?
> > >=20
> > 
> > ======================================================
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> > 
> 
> 
> *****************************
> Aizaz A Samuel
> University of Strathclyde
> Energy Systems Research Unit
> James Weir Building
> 75 Montrose Street
> Glasgow, UK
> G1 1XJ
> Tel +44 141 548 5765
> Fax +44 141 552 5105
> *****************************
> 
> 
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