[TRNSYS-users] Antwort: Re: Thermal bridges/Cold bridges in TRNBuild

[Anne-Kathrin.Albrecht at ise.fraunhofer.de]

Hello Faustine,

thanks for your quick reply. So the value asked by trnsys is the heat 
transmission resistance in hm²K/(kJ) (in this case the unit is wrong in 
TRNBuild), right?

I still have the problem that I would like to add a factor of 0.05 W/(m²K) 
for the heat transmission resistance for all surface areas. Does anyone 
have a solution how to implement that?

Anne



Von:    faustine escoffier <escoffier.faustine at gmail.com>
An:     Anne-Kathrin.Albrecht at ise.fraunhofer.de, 
Datum:  16.07.2012 18:40
Betreff:        Re: [TRNSYS-users] Thermal bridges/Cold bridges in 
TRNBuild



Hello Anne,
 
To enter ur cold bridge here there is a solution :
Create ur coldbridge in ur zone, the value asked by trnsys for a 
coldbridge  is in h.m.K / kJ is the value (1 / thermal linear 
transmission). Basically in France u will find this value in the thermal 
regelmentation. Then ur coldbridge is automatically created in ur wall 
type manager.
 
Then call, in the concerned zone, ur coldbridge and enter the lenght 
corresponding to the coldbridge. For exemple for a vertical coldbridge 
between two walls (consider the angle of two vertical walls), it will 
correspond to the height of the walls...
 
Faustine

2012/7/16 <Anne-Kathrin.Albrecht at ise.fraunhofer.de>
Dear Users, 

I know that this problem has been discussed before so I know that there is 
a bug, but am not sure how to handle it: 

1. When you add a new massless layer with coldbridge effect you have to 
enter the "resistancy" in hmK/(kJ). Do you actually have to enter the 
resistancy, which would be in hm²K/(kJ) or does TRNBuild asks for the 
conductivity, which would be in hmK/(kJ)? 

2. The layer type manager shows the same value for "resistancy" as typed 
in before in hm²K/(kJ). It´s just a problem of showing the units right, 
isn´t it? So is it actually the resistancy that is shown in both cases? 

3. What is meant by the length? Is it the part where the walls connect or 
is it the edge length? Independently of the entered value of the length, 
the u-value doesn´t change. How does TRNBuild calculate with this value? 


I would like to add a common used factor of 0,05 W/(m²K) for all surface 
areas. How do I implement that? 


Thank you very much for you help in advance, 

Anne
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-- 
ESCOFFIER Faustine 
Ingénieur Génie Énergétique et Environnement - INSA LYON 
Etudiante mastère spécialisé Construction et Habitat Durables - ENSAM/ESTP
 
06 79 98 75 85
escoffier.faustine at gmail.com

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