WUFI

Forum for the WUFI Software family

We are pleased to announce the release of WUFI® 2D 4.0

To upgrade sign in to our online shop
It is currently Fri Jul 20, 2018 9:31 am -1100

All times are UTC-11:00




Post new topic  Reply to topic  [ 2 posts ] 
Author Message
 Post subject: Quick Fire Questions on 'dry lining' a new build cavity wall
PostPosted: Wed Dec 21, 2011 5:37 am -1100 
Offline
WUFI User
WUFI User

Joined: Tue Sep 27, 2011 3:54 am -1100
Posts: 16
How do you model the effect of the foil on a PU/PIR type board, do you put in figures for emmisivity, vapour resistance/Sd value or do you ignore the foil?

If board is fixed using dabs should you model the 20 mm or so 'cavity'

In the main unfilled cavity wall what is the typical air change rate for non filled cavities in cavity walls

If there is a mold problem with the warm leaf of the cavity wall is more venitlation to the cavity going to help? Is it possible to vary the air change rate until the Wufi Bio goes orange/green?

Hope the questions are still clear

Happy Holidays


Top
   
 Post subject:
PostPosted: Wed Dec 21, 2011 8:53 pm -1100 
Offline
WUFI SupportTeam IBP
WUFI SupportTeam IBP

Joined: Tue Jul 19, 2005 2:50 am -1100
Posts: 104
Location: Fraunhofer IBP, Holzkirchen
Dear David,

you should consider the properties of the cover layer if its diffusion resistance is higher than the one of PU or PIR - the influence of a metal film on the radiation exchange over the air layer can be taken into account by adapting the effective heat and diffusion properties of the air layer (details you can find in the help).

The cavity can be modeled as stagnant air layer - ventilation you only get if you have openings to the indoor or outdoor climate. Is this intended? For venitlated air layers on the outside the n can vary between 10 and 200 h-1 depending on the size of the air gap and the openings... a higher ventilation rate with the exterior can improve the situation but does not always.

Daniel

_________________
Daniel Zirkelbach, IBP Holzkirchen


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 2 posts ] 

All times are UTC-11:00


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Imprint
Standard Business Terms/ Allgemeine Geschäftsbedingungen


Powered by phpBB® Forum Software © phpBB Limited