[TRNSYS-users] Cross flow ventilation

[David BRADLEY]

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.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.png
>
>  or I put a coupling air flow (same that natural ventilation mass 
> flow) for the horizontal surface ?
> image.png
>
> Thanks a lot.
>
> Best regards,
>
> -- 
> *Dr. Loïc Tachon *
> (+33) 6 7440-0536 (France)
>
> *
> *
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://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:+1.608.274.2577
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com
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