[TRNSYS-users] cold bridge

[Marion Hiller]

Dear Karol,

If you define a "cold bridge" in TRNbuild the following happens:

- Instead of defining layers as for a wall you define a "thermal 
resistance"
(without mass effects) 

- Instead of setting an area as for a wall you define a lenght

However, in the end this cold bridge is treated as "a massless wall".


If you use a detailed radiation mode, you can't add surfaces (and a cold 
bridge would be surface somehow) in order to keep the geometry 
consistent. 

It is not recommended to draw very small surfaces in T3d to represent 
the cold bridge unless you need the inside surface temperature because 
very small surfaces may cause trouble for matrix generation.

Therefore, the recommendation is to integrate the losses of a cold 
bridge into the wall by adjusting the u-value of a wall as previously 
mentioned by Adrien.

I hope this helps.

Best regards,

Marion


Dipl.-Ing. Marion Hiller 
TRANSSOLAR: KlimaEngineering - Technologien für energieeffizientes Bauen 
und Nutzerkomfort in Gebäude 
Munich - New York - Stuttgart + 49.711.67976.0 

Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart 
Amtsgericht Stuttgart - HRB 23347, Steuernummer 99073/00911, USt-IdNr.: 
DE152272639
Geschäftsführer: Dipl.Ing. Matthias Schuler, Dipl.Ing. Thomas Auer, 
Dipl.Phys. Stefan Holst, Prof. Dipl.-Ing. Bleicher 

 

-----Ursprüngliche Nachricht-----
Von: Karol Bandurski [mailto:karol.bandurski at put.poznan.pl] 
Gesendet: Donnerstag, 12. Juli 2012 18:25
An: trnsys-users at cae.wisc.edu
Betreff: [TRNSYS-users] cold bridge

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