[TRNSYS-users] Convection in a simple two storey zone

[David BRADLEY]

The Type56 model by itself does not calculate any interzonal air flow 
(ie the buoyancy of warmer air is not accounted for). Type56 allows you 
to specify coupling airflow between zones. Calculation of the coupling 
airflow must be done by integrating Type56's thermal solution with 
TRNFlow, COMIS, or Type97 (Contam). The effect you are seeing is only 
due to a change between the star-network (simple) radiation model and 
the gebhardt factor (detailed) radiation model now available in Type56.
Kind regards,
  David

On 4/14/2011 09:46, pseudomino at gmx.com wrote:
> Hi,
>
> In Trnsys 17, I made a very simple test : two little air-nodes 
> superposed, forming part of a thermal zone.
> There is only one windows facing south, at the first floor. I ditn't 
> made anything else.
>
> *Case 1 : Simple radiation model*
> Quite realistically, the second floor is warmer.
>
> *Case 2 : Detailed radiation model*
> The 2 air-nodes have their temperatures centered around the same value 
> and very near, except that the first floor has more extreme 
> temperature variations.
>
> I want to illustrate the hot air elevation by a simple example, but 
> I'm not sure of the phenomenon that are taken into account.
>
> Thank you !
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

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

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