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Active Contributor
zingero84
Posts: 28
Registered: ‎12-20-2011
Message 1 of 10 (898 Views)

Custom Construction Type R and U values

898 Views, 9 Replies
04-13-2012 09:32 AM

How do we create custom construction types to specify u and r values?  This is driving my nuts.  I have to find a number that's "close" but this isnt working out the best.

 

Ideas?

*Expert Elite*
CADastrophe
Posts: 3,116
Registered: ‎08-28-2009
Message 2 of 10 (896 Views)

Re: Custom Construction Type R and U values

04-13-2012 09:40 AM in reply to: zingero84

Find the file "Constructions.xml" within the directory "...\Program Files\Autodesk\Revit MEP 2012\Program\" assuming, of course, you're using RMEP 2012. Open the file in a program that can read it, such as Microsoft Excel, and then you should be able to add to, edit, and change these values as you see fit.

Corey D.                                                                                                                  ADSK_Logo_EE_2013.png    AutoCAD 2014 User  Revit 2014 User
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Active Contributor
zingero84
Posts: 28
Registered: ‎12-20-2011
Message 3 of 10 (891 Views)

Re: Custom Construction Type R and U values

04-13-2012 09:54 AM in reply to: zingero84

I get the error, "Cannot save or export XML data.  The XML maps in this workbook are not exportable."

 

So what's next?

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CADastrophe
Posts: 3,116
Registered: ‎08-28-2009
Message 4 of 10 (885 Views)

Re: Custom Construction Type R and U values

04-13-2012 10:12 AM in reply to: zingero84

I opened it in Microsoft Excel 2007 and then did SaveAs, setting the "Save as type" to "XML Spreadsheet 2003 (*.xml)". That got around the error. Be sure to save a backup of the original .xml file JIC.

Corey D.                                                                                                                  ADSK_Logo_EE_2013.png    AutoCAD 2014 User  Revit 2014 User
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Active Contributor
zingero84
Posts: 28
Registered: ‎12-20-2011
Message 5 of 10 (877 Views)

Re: Custom Construction Type R and U values

04-13-2012 11:50 AM in reply to: CADastrophe

Did that and added an entry.  I am now getting blank lines in the building construction type menu on revit.  Ideas?

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CADastrophe
Posts: 3,116
Registered: ‎08-28-2009
Message 6 of 10 (871 Views)

Re: Custom Construction Type R and U values

04-13-2012 12:22 PM in reply to: zingero84

OK, this should work: Rename the file and change extension to a .txt file. Copy the section of text (highlighted below), Paste it to create a new entry.

Change the information between the declarations (i.e. <name> XXX </name>). Rename and change extension back to .xml.

 

Constructions.JPG

Corey D.                                                                                                                  ADSK_Logo_EE_2013.png    AutoCAD 2014 User  Revit 2014 User
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Valued Mentor
julianjameson8403
Posts: 455
Registered: ‎06-16-2010
Message 7 of 10 (865 Views)

Re: Custom Construction Type R and U values

04-13-2012 12:29 PM in reply to: zingero84

Have you tried using either notepad++ or xml notepad? You can download these for free from the internet and can make xml editing easier.

When editing are you abiding by the naming conventions of the constructions and their xml format? From memory I think there is a link between the naming convention of the constructions and the Ashrae guides DOE2.

Check out the gbXML schema explanations in the wiki, both the entry on the constructions xml file as well as the reference section on gbXML generally. I have found you have to be precise in the syntax of gbXML to get it to work properly, especially in the Revit environment.

 

http://wikihelp.autodesk.com/Revit/enu/2013/Help/00001-Revit_He0/3251-Referenc3251/3288-Heating_3288...

 

http://wikihelp.autodesk.com/Revit/enu/2013/Help/00001-Revit_He0/3251-Referenc3251/3325-gbXML_Sc3325

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Active Contributor
zingero84
Posts: 28
Registered: ‎12-20-2011
Message 8 of 10 (846 Views)

Re: Custom Construction Type R and U values

04-16-2012 06:11 AM in reply to: zingero84

Ok, so it looks like Notepad++ works well.

 

Now, I created an entry, and checked to see if it worked.  It's listing the wrong u-value (different than the one I write in the code).  Here is the code (with the first entry being the one of copied from to make the custom).

 

Should I have different "id" values?  Where do these values reside?  Is this where it truly pulls the u value from? 

 

<Construction id="con-w339" surfaceType="ExteriorWall">
<Name>Plasterboard, concrete block, air, concrete block, plasterboard</Name>
<Description>1/2 in (12 mm) plasterboard on battens, 4 in (100 mm) lightweight aggregate concrete block, 3 in (75 mm) airspace, 4 in (100 mm) lightweight aggregate concrete block, 1/2 in (12 mm) plasterboard on battens [Source: CIBSE] </Description>
<LayerId layerIdRef="lay-w339"/>
<U-value unit="WPerSquareMeterK">0.62</U-value>
</Construction>
<Construction id="con-w339" surfaceType="ExteriorWall">
<Name>Face brick, masonry mat, poly insulation, densglass, metal stud, gyp board</Name>
<Description>Brick veneer, 1" clear masonry mat, 3" poly insulation, vapor barrier, 5/8" type X densglass, 6" metal stud, 5/8" gyp board [Source: CIBSE] </Description>
<LayerId layerIdRef="lay-w339"/>
<U-value unit="WPerSquareMeterK">0.0508389</U-value>
</Construction>

Active Contributor
zingero84
Posts: 28
Registered: ‎12-20-2011
Message 9 of 10 (836 Views)

Re: Custom Construction Type R and U values

04-16-2012 07:03 AM in reply to: zingero84

Moreover, I tried creating new con-XXX groups and lay-XXX and mat-XXX groups and then using the meter length and conductivity to calculate the u value, and it didn't work.

*Expert Elite*
CADastrophe
Posts: 3,116
Registered: ‎08-28-2009
Message 10 of 10 (824 Views)

Re: Custom Construction Type R and U values

04-16-2012 07:47 AM in reply to: zingero84

I'm finding very little information on this topic, but here is a link with some instructional info. I don't think I can help much more beyond this...

Corey D.                                                                                                                  ADSK_Logo_EE_2013.png    AutoCAD 2014 User  Revit 2014 User
──────────────────────────────────────────────────────────────────────
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