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vuego
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PostPosted: Tue Sep 16, 2014 2:14 pm    Post subject: Psi value calculation Reply with quote

I am trying to simulate thermal bridge similar to certified slab-wall connection by passive.de

I've attached the detail mentioned above with Psi=-0.2 W/mK

I cannot come close to the certified Psi value using Ecodesigner as thermal bridge simulator. I've tripple checked every value I use and still get weird results from Ecodesigner.

What am I doing wrong here?



Passiv.jpg
 Description:
Passive.de certificated detail Psi=-0.2 W/mK
 Filesize:  75.91 KB
 Viewed:  435 Time(s)

Passiv.jpg



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Last edited by vuego on Tue Sep 16, 2014 2:17 pm; edited 2 times in total
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vuego
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PostPosted: Tue Sep 16, 2014 2:14 pm    Post subject: Re: Psi value calculation Reply with quote

Ecodesigner's result - Psi=0,36 W/mK


EcoD.jpg
 Description:
Ecodesigner Psi=0,36 W/mK
 Filesize:  63.57 KB
 Viewed:  386 Time(s)

EcoD.jpg



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vuego
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PostPosted: Fri Sep 19, 2014 1:10 pm    Post subject: Re: Psi value calculation Reply with quote

I am attaching my source file to clarify things a bit:
https://dl.dropboxusercontent.com/u/3128804/PsiCoefficient.pln


Could somebody verify my detail and Psi calculation?
Where might be the problem?

Psi value should definitely be negative in this case. Is there a problem with ground that should be calculated as infinite element?

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martyl
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PostPosted: Tue Sep 30, 2014 1:48 pm    Post subject: Re: Psi value calculation Reply with quote

I think Psi in Ecodesigner doesn't mean Psi but I don't know what does it mean:D If I move border of detail, I'll get the another Psi value and this is not possible. Can this explain anybody from Graphisoft? I thought It could be thermal transmittance of the whole detail, but it isn't too. Sad
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Vahur
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PostPosted: Sat Nov 29, 2014 2:48 pm    Post subject: Re: Psi value calculation Reply with quote

May I ask here about an error?
Why does it happen?



thermal.JPG
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 Filesize:  100.07 KB
 Viewed:  365 Time(s)

thermal.JPG


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Vahur
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PostPosted: Sun Nov 30, 2014 7:29 pm    Post subject: Re: Psi value calculation Reply with quote

martyl wrote:
I think Psi in Ecodesigner doesn't mean Psi but I don't know what does it mean:D If I move border of detail, I'll get the another Psi value and this is not possible. Can this explain anybody from Graphisoft? I thought It could be thermal transmittance of the whole detail, but it isn't too. Sad

Follow the standards which describe how thermal bridge conductivity is calculated. In case of wall/wall for example you must take 3x thickness of construction as its length in the detail. In case of the floor on ground it is 4 meters or a half of building (the bigger value).
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