[TRNSYS-users] Cold bridge parameters

[Diego A. Arias]

Hi Jeff,

My understanding is that in TRNBuild you specify a wall with cold-bridge 
effect, not specifically a cold-bridge.  You enter the thermal 
resistance for the conduction part of the heat transfer in the wall.  
Therefore, the solar absorbtance of the wall gives you the conditions 
for the energy balance at the surface.
If I understand correctly, this model has the similar characteristics 
of  wall that only contains a massless layer.  You end up entering the 
same values: absorptivity at the two surfaces, and the conduction 
resistance of the wall.
I hope it helps,

Diego


jfamailbox-i3er at yahoo.fr wrote:
>
>
>     Hi all,
>     As coldbridge is not a surface, I don't understand what does it
>     mean heat convection and solar parameters for a coldbridge ?
>     How TRNSYS take into acount these values for transfert calculation ?
>     Best regards,
>     JeFF
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-- 

Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706