[esp-r] Zero Stack Pressure

[Mostapha Sadeghipour]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.strath.ac.uk/archives/esp-r/attachments/20100609/022ee5e5/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Atrium-AFN-03.gif
Type: image/gif
Size: 39515 bytes
Desc: not available
Url : http://lists.strath.ac.uk/archives/esp-r/attachments/20100609/022ee5e5/attachment-0001.gif