Re: [EnergyPlus_Support] How do define a closed window and simulate a chimney

["Michael J. Witte" <mjwitte@xxxxxxxx>]

>From the ventilation expert . . .

For question 2:  The AirflowNetwork is unable to model a chimney well. Your 
anwser is correct. The main problem is that the relationship between pressure 
and airflow is not well defined, although a crack component may be used when a 
damper is close. The other problem is that no heat source is allowed in the 
AirflowNetwork components.  

For question 3: The AirflowNetwork model is unable to simulate single-side 
ventilation well, because the model uses the same boundary conditions for 
multiple openings at the same side. However, the model is able to handle cross 
vent well.  

On 31 Aug 2007 at 16:56, Michael J. Witte wrote:

> On 24 Aug 2007 at 19:04, raphmissah wrote:
> 
> > 1. How to define a closed or partially opened window?
> 
> EnergyPlus windows (Surface:HeatTransfer:Sub, Window) are always closed by
> default.  To simulate opening of windows (partially or fully) for airflow, see
> the AirflowNetwork objects.
> 
> > 2. How to simulate a chimney in a particular zone? 
> 
> One would use the AirflowNetwork multizone model to do this, but I am not sure a
> chimney can be modeled well.  I will forward this to the natural ventilation
> experts.  
> 
> > 3. Lastly, a anything to learn on cross and single-sided ventilation? 
> > 
> 
> I will ask the natural ventilation expert.
> 
> Mike
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@xxxxxxxx
> 
> 
> 
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