[esp-r] Re: Zero Stack Pressure

[Mostapha Sadeghipour]

Hello Aizaz,

I think the problem is not the node heights in my case, however I'm not
sure. The .afn file is attached.

Regards,

Mostapha Sadeghipour

On Wed, Jun 9, 2010 at 3:54 PM, Aizaz Samuel <aizaz.a.samuel at strath.ac.uk>wrote:

> Look up how node heights are defined in exemplars>network
> ventilation>alternative facade vent.....
>
> Theory can be found in Jan Hensen's thesis (section 4.3.2) available at
> http://www.esru.strath.ac.uk/publications.htm
> --
> Dr Aizaz A Samuel
> Department of Mechanical Engineering
> University of Strathclyde
> M324 James Weir Building
> 75 Montrose Street
> Glasgow, UK
> G1 1XJ
>
> T:+44 141 548 5765
> F:+44 141 552 5105
>
> On Wednesday 09 June 2010 11:28, Mostapha Sadeghipour wrote:
> > Dear esp-r users,
> >
> > I'm modeling an atrium with a closed glass roof. The atrium has nearly
> 16m
> > height and it only connects to the outside through 3 cracks on the roof.
> I
> > divided the atrium into 5 vertical zones, and adjacent vertical bypass
> > zones. They are connected to each other through fictitious faces.
> >
> > Common orifice components connect zone nodes to each other vertically,
> and
> > door component connects zone nodes to bypass nodes horizontally. The
> > attached image shows the Air Flow Network in my model more clearly.
> >
> > I supposed that esp-r includes the stack effect whenever delta height
> > between the nodes and the component is not zero. So I expected to have a
> > stack pressure in the vertical connections. But when I check the results
> > the stack pressure in the connections are zero!
> >
> > I'm also curious how esp-r consider the stack effects and the gravity?
> The
> > components dP are set manually and there is no "g" in the equations?
> Where
> > I can find the PSTACK equations that is used to calculate DP:
> > DP=PRES(IDPS)-PRES(IDNE)+PSTACK(ICNN).
> >
> > Thanks in advance.
> >
> > Mostapha Sadeghipour
>
>
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