Air infiltration

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guyEANZ
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Air infiltration

Post by guyEANZ » Mon Jun 30, 2014 3:13 pm -1100

How do you model air infiltration (from internal environment) in WUFI 2D?
I have a timber frame wall build-up

Christian Bludau
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Re: Air infiltration

Post by Christian Bludau » Thu Jul 03, 2014 2:33 am -1100

The air infiltration model is not yet implemented in WUFI 2D 3.4. An other way could be to use an air exchange source, but you have to assume the values of the air exchange, i do not know any literature about that.
Christian

Kit Elsworth
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Re: Air infiltration

Post by Kit Elsworth » Tue Oct 25, 2016 10:51 am -1100

Seeing that the last response on this post was from 2014, I was wondering if there has been an update on air infiltration with WUFI 2D. Can you please confirm that there still does not exist a way to model air infiltration within an wall assembly?

Christian Bludau
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Re: Air infiltration

Post by Christian Bludau » Tue Oct 25, 2016 7:13 pm -1100

Dear Kit,

yes, i have to confirm that at the moment. We are working on an upgrade for WUFI 2D, but that will need about one more year.
At the moment you can take in account the air infiltration by combining WUFI Pro and 2D:
1) Calculate your construction with WUFI Pro with air infiltration source included.
2) Export source to file (ASCII-Export)
3) Multiply source values with width of source in WUFI 2D (as in WUFI 2D unit of source is [kg/(m*s)] and in WUFI Pro [kg/(m²*s)], see attached pdf)
4) use source file for calculation in WUFI 2D. The WUFI 2D source should be in the same position as in WUFI Pro.

Christian
Attachments
quelle1D2D.pdf
Units of sources in WUFI Pro and WUFI 2D
(543.41 KiB) Downloaded 307 times

msteinwender
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Re: Air infiltration

Post by msteinwender » Mon Dec 16, 2019 12:27 am -1100

Hello,

I am posting this as a repost here, because I think "air infiltration" is the way to execute our task and we want to know, what's the up-to-date procedure.

We work with WUFI 2D 4.2 and the task is as following:

We want to simulate a timber-frame-wall (for special room usages) with OSB inside and a ventilated cladding (hinterlüftete Verkleidung) outside in 2 versions:
a) with a vapor barrier inside, and
b) only OSB (without additional vapor barrier). Herefore, the "Luftdurchlässigkeit" of the OSB according to EN 12114 (at 50 Pa pressure difference) of 0,12 m/(m²*h) should be taken into account. How can this be done properly?

Markus

Christian Bludau
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Re: Air infiltration

Post by Christian Bludau » Sun Feb 23, 2020 8:12 pm -1100

Hi Markus,

sorry for the late answer, I just found your question.
As the infiltration source still did not find its way into WUFI 2D, the best way would be to do a simulation in WUFI Pro and use the source strength for your 2D simulation, as described above.

Christian

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