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Mattieu,<br>
I think that the wall type manager is where the incorrect units are
displayed. My understanding is that a coldbridge does not have any
thickness but it does have a length. For example, if you want to make a
coldbridge to represent the lack of insulation where two exterior walls
are joined, you would define a coldbridge that has the length of the
joint. The resistance you enter should be in kJ/h.m.K (where the length
is the length of the bridge). The error in TRNBuild is that the wall
type manager should change the units of u-value when a coldbridge wall
is displayed. Note that since the u-value displayed in the wall type
manager is not actually used in calculation, that this error should not
affect your results.<br>
Kind regards,<br>
David<br>
<br>
<br>
matthieu duclos wrote:
<blockquote
cite="mid:17932260.105838.1239873486754.JavaMail.www@wwinf8203"
type="cite">Dear Trnsys Users,
<br>
<br>
I have a problem about a bug for thermal bridge, I find an answer in
the archives but ...:
<br>
<br>
<br>
Hi Nicola,
<br>
<br>
nicola wrote:
<br>
> Dear all,
<br>
> I'm modelling a wall wit a thermal bridge effect.
<br>
> I found a bug in TRNBuilt :
<br>
> 1. If I put the value of resistence equal to xxx (hmK/kJ) in the
layer <br>
> manager, the program create a wall with a U-value expressed in
kJ/h <br>
> m^2K and a resistence equal to xxx in hm^2k/kJ!!!
<br>
Thanks for finding this bug. I think it is only a problem of displaying
<br>
the units. The resistance should be entered in h m^2K /kJ, and not h m <br>
K /kJ. When you check on the 'Layer type manager', the resistance is <br>
shown in h m^2K /kJ.
<br>
> 2. the u-value of a wall with thermal bridge effect is lower than
the <br>
> same wall without thermal bridge effect.
<br>
The u-value displayed in the 'Wall type manager' is calculated by
adding <br>
two reference heat transfer coefficients to the wall (7.7 and 25 W/m^2
K).
<br>
<br>
Best regards,
<br>
<br>
Diego
<br>
<br>
<br>
... in "Walls" when I choose a coldbridge I can put the value for
length in m , not a surface in m^2.
<br>
<br>
What is the solution? <br>
If the solution is all in m^2, how can I change a linear thermal bridge
to surface thermal bridge?
<br>
<br>
Thanks in advance,
<br>
<br>
Matt
<br>
<br>
<br>
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