Taking into account wind on building surface

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Hey All,

I was hoping someone could clarify whether or not eQuest takes into account
the wind load placed on the exterior surface of the building. I know that
the direction, speed, and temperature of the prevailing breezes are
included in the weather file, but am unsure as to whether or not this data
is included on heat transfer through the building envelope.

The case in point is a large facade directly aligned with the winter
prevailing breezes of our site and whether or not this heat transfer is
being accounted for on the surface.

Any and all help is much appreciated.
Thanks.

--
Patrick J Keeney

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Patrick,

eQUEST accounts for wind with most of the infiltration methodologies. From the Help screen...

[cid:image001.jpg at 01CDCD7F.94D32A60]

...and...

[cid:image002.jpg at 01CDCD7F.94D32A60]

Keith Swartz, PE, LEED AP

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Thanks Kieth.

This makes sense. Based on air speed and air pressure, you would expect to
see an adjusted air infiltration.

However, does eQuest take into account the location of the facade in the
context of the building. For example, if you had a U-shaped building, the
faces on the interior of the "U" would not see as much direct wind exposure
as the faces on the exterior of the "U." Does eQuest take into account the
effects the building geometry will have?

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The following page http://bepan.info/proj-bldgs/p-14-tall-bldg-press on the website http://bepan.info/ is a preliminary investigation into infiltration in very tall bldgs that tries to take into account Stack Effect and Bldg Pressurization (stairwells, elevator shafts, etc.) on infiltration which would theoretically vary by floor level. The outside temperatures and wind velocities would also vary by floor level theoretically. It is still being discussed and developed by a group in Chicago. Please send me your views and ideas of how this should be done in an energy program and if you think that the present methods are adequate. Examples of these bldgs are 828m Burj Khalifa Dubai and 1000m Kingdom Tower Jeddah.
http://en.wikipedia.org/wiki/Burj_Khalifa
http://en.wikipedia.org/wiki/Kingdom_Tower
Varkie Thomas
http://www.iit.edu/arch/faculty/thomas_varkie.shtml

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Patrick,

I don't know for certain, but I would be very surprised if the program adjusted the wind speed for the building shape. It seems to me like that would need a CFD-like calculation for the air flow around the building.

The program can take into account the surrounding terrain. In the Project & Site module under Site Data there is a tab for Terrain. See the Help screens for more details.

[cid:image003.png at 01CDCE0A.509B1CF0]

Keith Swartz, PE, LEED AP

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