[esp-r] Re: Zero Stack Pressure

[Aizaz Samuel]

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