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

[Anne-Kathrin.Albrecht@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@gmail.com>
An:      
 Anne-Kathrin.Albrecht@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@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
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://mailman.cae.wisc.edu/listinfo/trnsys-users




-- 
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@gmail.com