Can we change the indoor temperature in free version?

holyspidoo · Post by **holyspidoo** » Thu Jan 31, 2013 6:24 am -1100

Is it possible to change it? I seem to be locked to either using ASHRAE 160 or EN 15026 which use 21.1.

I want to test using 18 Celsius indoor...

Manfred Kehrer · Post by **Manfred Kehrer** » Thu Jan 31, 2013 7:37 am -1100

No, I am sorry to say, you can not change this in the free version.

holyspidoo · Post by **holyspidoo** » Fri Feb 01, 2013 2:59 am -1100

What would be the cheapest option for me to change that temperature (given I need north american version since I live in Quebec)?

All I'm trying to do is find out why my brand new house had a condensation problem inside the wall, and since most people you hire to 'diagnose' these issues say whatever they want, I wanted to check the hard data...

Thank you

Manfred Kehrer · Post by **Manfred Kehrer** » Fri Feb 01, 2013 3:09 am -1100

To get hard data for your house you need hard input data for WUFI first for exactly this time period.

Indoor conditions
Outdoor conditions.
Precise Material Properties.

This is called a forensic study and I doubt that you will be successful with the limited free version.....sorry.

If you have an air tight envelope without any vapor retarder on the interior side of the insulation in a cold climate, this may be the problem.

holyspidoo · Post by **holyspidoo** » Fri Feb 01, 2013 3:19 am -1100

Is it at least possible to change the perm value for the vapor barrier on the inside?

The material I used is 0.07 perm, but I want to see the difference when using perm 0.03 (the material I used on the first floor is 0.03)

Manfred Kehrer · Post by **Manfred Kehrer** » Fri Feb 01, 2013 4:18 am -1100

Well you have the option to select the perm of a interior coating from the list and further more add as many membranes on the interior from the database to come up with your desires overall permeance.

holyspidoo · Post by **holyspidoo** » Fri Feb 01, 2013 8:39 am -1100

Interior Coating can only be .1 1 10 or 5, right? I can't specify 0.03 directly?

As for adding membranes, the only one I can find in the database of the ORNL version is the 0.07 perm one. If there was one that was 0.01, I guess I could add three (if perm units are additive?)

Manfred Kehrer · Post by **Manfred Kehrer** » Sat Feb 02, 2013 6:50 am -1100

The Resistances are additive, not the perm values!