Hi all,
I am interested to know more about the assumptions made when you use a type of wall for example lightweight non insulated wall. I have been on the user's manual an found same values
Units 
Rvalue 
Unit density 
Heat capacity 
IP 
ft²hr ºF/Btu 
lbm/ft² 
Btu/(ft² •°F) 
SI 
W/(m² • °K) 
kg/m² 
J/(m² • °K)

Mass Exterior Wall
The following table shows IP values.
Conceptual Construction 
Rvalue 
Unit density 
Heat capacity 
Lightweight Construction  High Insulation 
25 
23 
5 
Lightweight Construction  Typical Cold Climate Insulation 
17 
21 
4 
Lightweight Construction  Typical Mild Climate Insulation (default) 
10 
18 
4 
Lightweight Construction  Low Insulation 
8 
19 
4 
Lightweight Construction  No Insulation 
3 
18 
4 
High Mass Construction  High Insulation 
17 
115 
23 
High Mass Construction  Typical Cold Climate 
15 
110 
22 
High Mass Construction  Typical Mild Climate 
11 
110 
22 
High Mass Construction  No Insulation 
1 
110 
22 
However my question is in Europe we normally use W/m.k, kg/m^{3} and j/kg.k
I would like to know if anyone knows the thickness in which this walls are based so I can calculate the equivalent to Europe or if anyone knows the document in which this walls are based on
Also I have another question in HVAC, is any ideal HVAC system temp which it can be used in Vasari, the HVACs on Vasari are focus on USA and it would be good if for example I want to know which wall will be the most appropiate in certain area in Europe without have to know much about the Hvac system.
Thanks
fernando
We have added metric values for conceptual constructions to our wiki help. You can find them at this link
http://wikihelp.autodesk.com/Revit/enu/Community/Articles/Conceptual_Constructions__Metric_SI_Values
Hi Fernando,
Thanks for writing in with your question. To convert an Imperial Rvalue into a Metric Uvalue, divide 1 by the Rvalue, then multiply the result by 5.682. Alternatively to convert a metric Uvalue to an Imperial Rvalue, multiply by 0.176, then divide 1 by the result. It’s not really to do with the thickness of the wall specifically but the thickness and conductivity of each layer (brick, insulation, block etc.) in the wall construction, plus a couple of other parameters. We are workign to get the metric values on our help wiki, I will send you a link when it's finished.
At this time the system choices in Vasari are fixed. The system you chose will impact energy performance based on how efficiently it services the heating / cooling load however if you are concerned with investigating wall insulation alone you may be better off focusing on the monthly heating load / monthly cooling load outputs. These are relatively independent of the system type.
Hope that helps,
Lilli