Simulating unventilated cold roof

[Francisco]

I need to simulate an unventilated pitched cold roof, but I am not sure how to simulate the loft space. Can this inhabitable big space be simulated like a normal air cavity?


Thanks

[David Lam]

I've also been asked to look at a cold roof situation to determine the amount of ventilation needed.
Is there any guidance on doing this in WUFI please?

[Christian Bludau]

Hi David,
please have a look in our download section:
https://wufi.de/en/service/downloads/

Start over with the "Handling of typical constructions":
https://wufi.de/en/service/downloads/#t ... structions

In the list there are also more specific tutorials about different roof types.

Best regards
Christian

[David Lam]

Hi Christian
That is very helpful thank you.
However I'm looking at this sort of build-up which is not in the guidelines you have linked to.
Do you think WUFI is an appropriate tool for this? Image is from EN 5250

Figure 54 from EN 5250

Figure 54 from EN 5250.png (102.19 KiB) Viewed 2661 times

Thank you
D

[Christian Bludau]

Hi David,

the attic space itself can not expressed in WUFI as an air layer, as there will be a significant influence of the convection.
We set up models to derive the interior climate from the outside conditions for unheated attic spaces, but this is only available in German at the moment. Maybe you can use some online translation tool.

Here you can find a summary of the models:
https://wufi.de/de/wp-content/uploads/sites/9/555.pdf
and this is the full research report where the models where developed:
https://wufi.de/literatur/Zirkelbach,%2 ... gungen.pdf

Another way would be to model the attic space in WUFI Plus and calculate the attic space climate conditions which then can be used as boundary conditions for WUFI Pro or 2D.

Christian

[David Lam]

Thanks Christian