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 Wed Jan 17, 2018 4:26 pm -1100

All times are UTC-11:00




Post new topic  Reply to topic  [ 5 posts ] 
Author Message
 Post subject: Prepopulate boundary conditions from passive house model
PostPosted: Thu Dec 21, 2017 6:12 am -1100 
Offline
WUFI User
WUFI User

Joined: Thu Dec 21, 2017 6:03 am -1100
Posts: 4
I've found a problem in transferring data between Passive house verification and WUFI Plus. Assigning boundary conditions from the passive house model in WUFI plus is continually adding to the heat load/ demand on the verification side. After selecting the option to prepopulate boundary conditions from passive house model on the WUFI Plus side, when I return to the Verification side the heating demand and load have both increased. If I click ‘Assign’ to Populate Boundary Conditions multiple times, on the WUFI plus side, the model gains more heat demand/load on the verification side every time. I can't find which data fields are being changed on the Verification side, and can't go back to the original model.

Looking for any insight on what exactly is being changed, and why data seems to be updating in both directions, not just from the model to WUFI Plus.

Thank you!
Maren

_________________
Maren Longhurst, Assoc. AIA, CPHC

www.rodell.design


Top
   
 Post subject: Re: Prepopulate boundary conditions from passive house model
PostPosted: Thu Dec 21, 2017 7:15 am -1100 
Offline
WUFI SupportTeam IBP
WUFI SupportTeam IBP

Joined: Wed Jul 11, 2012 11:21 pm -1100
Posts: 149
Hi Maren,

thank you for your post! actually this is a bug, which will be fixed in the next release version (past 3.1.1.0).

Within the monhtly balance calculation, the effective heat recovery efficiency is calculated, depending on the ventilation device HRV/ERV efficiency and e.g. the ducts.

by assign the boundary condtions from passive house model, the effective heat recovery efficiency is set for the HRV/ERV efficiency of the device, for the dynamic simulation (because there is no dynamic duct model so far).

unfortunately it replaces also the input for the verification side. So with each click on assign, the HRV/ERV efficiency for the mechanical ventilation device is reduced.

I will post the insight on what is being changed soon, and it will be added in the manual. The data update with the prepopulate boundary condition button should be one-way (from verification to the dynamic inputs) and only for dynamic WUFI Plus input, which is not used, or different on the verification side. global input, like the building geometry, is always coupled in both scopes.

Thank you!
Matthias


Top
   
 Post subject: Re: Prepopulate boundary conditions from passive house model
PostPosted: Thu Dec 21, 2017 7:42 am -1100 
Offline
WUFI User
WUFI User

Joined: Thu Dec 21, 2017 6:03 am -1100
Posts: 4
Matthias,

Thank you so much for your quick response! We've spent a few stressful days trying to find the changes to the verification model to trace our steps backward and this is an easy fix. Looking forward to the next release.

Maren

_________________
Maren Longhurst, Assoc. AIA, CPHC

www.rodell.design


Top
   
 Post subject: Re: Prepopulate boundary conditions from passive house model
PostPosted: Thu Dec 21, 2017 8:33 am -1100 
Offline
WUFI User
WUFI User

Joined: Thu Dec 21, 2017 6:03 am -1100
Posts: 4
Another question on a related topic...The setpoints carried over from the passive house model include Internal loads: "A constant internal load is added depending on the internal heat gains of the passive house calculation." Does this load include people, appliances, and systems as a constant load? If so, then we would need to add profiles for occupants, etc on the dynamic side to be more accurate, right?

_________________
Maren Longhurst, Assoc. AIA, CPHC

www.rodell.design


Top
   
 Post subject: Re: Prepopulate boundary conditions from passive house model
PostPosted: Mon Jan 08, 2018 1:17 am -1100 
Offline
WUFI SupportTeam IBP
WUFI SupportTeam IBP

Joined: Wed Jul 11, 2012 11:21 pm -1100
Posts: 149
Yes, the internal loads per square meter from the passive calculation are set constant each day, and only as convective internal heat load on the dynamic side.


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 5 posts ] 

All times are UTC-11:00


Who is online

Users browsing this forum: No registered users and 2 guests


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