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

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@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 ! 

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