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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