[TRNSYS-users] Cross flow ventilation

[Loic Tachon]

Thanks for the answer, in my case I know the ventilation cross flow induced
by the stack effect and I suppose that this flow cross all the zone.

Do I need to delete the horizontal air nodes adjacent surface (surface
inside the radiation zone) to get just one radiation zone ?

If we know the flow between airnodes, is it better to put it via coupling
between zones pop up ?
[image: image.png]
 or through surface definition, adjacent coupling air flow (if the adjacent
surfaces are not deleted) ?

[image: image.png]

Thanks a lot.

Regards,

Le ven. 13 janv. 2023 à 16:56, David BRADLEY <d.bradley at tess-inc.com> a
écrit :

> Loïc,
>
>   The best way to address airflow within a building is to couple your
> Type56 simulation either with TRNFlow or CONTAM (Type97). The basic idea is
> that you build a parallel model to your Type56 containing information about
> the airflow openings between the airnodes (a radiation zone can contain
> multiple airnodes, especially where there is an atrium like you have
> described). TRNFlow or CONTAM then take the air node temperatures as well
> as the wind speed and geometry of the building and determine the amount of
> air flow that results between the air nodes. Large horizontal openings are
> challenging because both TRNFlow and CONTAM treat air flow through a
> horizontal opening as unidirectional. Still, it is by far the most rigorous
> way of treating the situation.
>
> kind regards,
>
>  David
>
>
> On 1/13/2023 8:29 AM, Loic Tachon via TRNSYS-users wrote:
>
> Dear Trnsys community,
>
> I want to simulate the stack effect in a high room with high thermal gain.
>
> For this, I have 1 zone and 5 thermal air nodes in the z direction to get
> the temperature at several heights.
> [image: image.png]
> How can I do this and avoid that TRNSYS see ceiling between the zone ? Do
> I need to delete the horizontal surface for zone 2-3-4 ? Or do I put mass
> less horizontal surface ?
>
> As Well, how do I do the cross flow ventilation ? Do I use the couple mass
> flow between zones ?
> [image: image.png]
>
>  or I put a coupling air flow (same that natural ventilation mass flow)
> for the horizontal surface ?
> [image: image.png]
>
> Thanks a lot.
>
> Best regards,
>
> --
> *Dr. Loïc Tachon *
> (+33) 6 7440-0536 (France)
>
>
>
> _______________________________________________
> TRNSYS-users mailing listTRNSYS-users at lists.onebuilding.orghttp://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy System Specialists, LLC
> 3 North Pinckney Street - suite 202
> Madison, WI  53703 USA
>
> P:+1.608.274.2577d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
>
>

-- 
*Dr. Loïc Tachon *
(+33) 6 7440-0536 (France)
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