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

[pseudomino@gmx.com]

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 !