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Re: [TRNSYS-users] cold bridge
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@put.poznan.pl]
Gesendet: Donnerstag, 12. Juli 2012 18:25
An: trnsys-users@cae.wisc.edu
Betreff: [TRNSYS-users] cold bridge
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