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[EnergyPlus_Support] Re: Natural ventilation through horizontal openings_AirflowNetwork

Good question. The horizontal opening is designed for interlevel openings like stairwells (see engineering ref.). I think the reason why roof cracks are mainly ignored is because most infiltration is wind driven and when the wind flows over the roof it mainly creates a negative pressure which may result in small amounts of exfiltration. Exfiltration is usually not as interesting as infiltration. The best article I've seen dealing with the "infiltration" of buildings is:

http://ibpsa-boston.com/minutes/IBPSAboston-presentations_2011-09-16_Gowri.pdf

I'm trying to come up with a good infiltration methodology for a sawtooth roofed factory. The large factory hall in nestled inside other buildings and basically only the roof is exterior surface which peaks out about 2 m above all else. The aspect ratio of the hall gives it a large volume to exterior surface area relationship.
150 x 90 x 12 m

Let us know what you learn.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Vaibhav Jain <vaibhav.energyarchitect@...> wrote:
>
> Hello everyone!
> 
> I am trying to understand natural ventilation through AirflowNetwork. The
> model is a simple single storied model, with a periphery and a core zone.
> The periphery zone has several vertical windows; and the central core zone
> has only one horizontal window on its roof.
> 
> As per the IO reference - the AirflowNetwork model, in
> AirflowNetwork:MultiZone:Component:SimpleOpening and
> AirflowNetwork:MultiZone:Component:DetailedOpening, assumes openings to be
> vertical or close to vertical, this is good in case of vertical windows in
> periphery zone. That also means that the horizontal window in the core zone
> cannot be defined with these field. So then I
> tried AirflowNetwork:MultiZone:Component:HorizontalOpening for the
> horizontal window, but, the IO reference says that this field assumes
> openings to be - horizontal or close to horizontal AND AN INTERZONE
> SURFACE.
> 
> So my question is: how can we define AirflowNetwork for outside viewing
> horizontal windows, which are not INTERZONE SURFACES (for eg. a horizontal
> skylight with openings)?  OR we simply cannot define it for such openings?
> 
> I hope the query is comprehensible. Thank you!
> 
> Best regards,
> Vaibhav Jain
> www.vaibhavjain.co
>




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