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Toddg123
Posts: 1
Registered: ‎04-14-2011
Message 1 of 12 (887 Views)

REVIT MEP 2012 GBXML Window Interpretation

887 Views, 11 Replies
07-07-2011 10:30 AM
We are experiencing an issue where REVIT MEP 2012 GBXML is not correctly reading the window heights. The example we have is that there is an exterior wall with a 4' W x 7'H window that is being read as a 4'W x 5'H window in the Export GBXML viewer and exported gbxml model in Trace 700. We have reviewed the window family and can see any parameter that might be responsible for the reduced opening but can't find anything odd. Has anyone else experienced this?
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AnnaOscarson
Posts: 30
Registered: ‎07-16-2007
Message 2 of 12 (882 Views)

Re: REVIT MEP 2012 GBXML Window Interpretation

07-07-2011 02:05 PM in reply to: Toddg123

Hello,

 

Would it be possible to get a copy of the project? If yes, please send it to me (anna.oscarson@autodesk.com) and we will take a look at it.

 

Thanks,

Anna



Anna Oscarson
QA Analyst
Building Design and Collaboration, IPG
Autodesk, Inc.
Distinguished Contributor
bcpratt
Posts: 169
Registered: ‎09-20-2004
Message 3 of 12 (645 Views)

Re: REVIT MEP 2012 GBXML Window Interpretation

10-02-2012 01:12 PM in reply to: Toddg123

I experienced a similar problem with RMEP 2013 (see image below).  In my case, the whole window assembly/opening size was treated as the window.  I wound up modifying the height in Trace 700 to exclude the bottom non-glazing panel since neither my assembly SHGC nor U-value include it.

 

Something else that escaped me until now is the opening quantity exported.  Previously in Trace 700 when looking at the Room Single Sheet it appeared the imported opening area was incorrect if a wall in the model contained multiple openings.  However, the correct quantity/area of openings can be seen on the "Walls" tab for the respective wall.

 

2012-10-02_1600.png

Employee
AnnaOscarson
Posts: 30
Registered: ‎07-16-2007
Message 4 of 12 (641 Views)

Re: REVIT MEP 2012 GBXML Window Interpretation

10-02-2012 01:31 PM in reply to: Toddg123

Hi,

Can you please send me the Revit file, so that we can take a look at it?

Thanks,

Anna

[anna.oscarson@autodesk.com]



Anna Oscarson
QA Analyst
Building Design and Collaboration, IPG
Autodesk, Inc.
Contributor nyu
Contributor
nyu
Posts: 14
Registered: ‎09-24-2012
Message 5 of 12 (554 Views)

REVIT Architecture 2013 GBXML Window thermal materials missing

01-23-2013 05:15 PM in reply to: AnnaOscarson

Hi,

I am having similar problems after exporting gbXML file from Revit Architecture 2013. 

I have assighed materials for the windows, doors and walls in Revit 2013. After I export it as gbXML file, I find that in the gbXMl file, the and doors and walls' materials are well delivered, while the materials for windows are not. I can not see the thermal and physical properties in gbXML. All gbXML file has is "WindowType id="GSP4R"".

My purpose is use the gbXML file to do energy analysis using Energy Plus, but since the windows' materials are missing, how could I do the energy performence analysis ? 

 

Thanks!

Best,

Na 

Employee
AnnaOscarson
Posts: 30
Registered: ‎07-16-2007
Message 6 of 12 (534 Views)

Re: REVIT Architecture 2013 GBXML Window thermal materials missing

01-24-2013 03:16 AM in reply to: nyu

Hello,

An opening of the opening type “OperableWindow” does not have a constructionidref associated. It has a windowtypeidref. The WindowType contains information about U-value, SolarHeatGainCoeff and Transmittance. For more info please see http://wikihelp.autodesk.com/Revit/enu/2013/Help/00001-Revit_He0/3251-Referenc3251/3325-gbXML_Sc3325...

 

Hope this helps!

Anna



Anna Oscarson
QA Analyst
Building Design and Collaboration, IPG
Autodesk, Inc.
Contributor nyu
Contributor
nyu
Posts: 14
Registered: ‎09-24-2012
Message 7 of 12 (521 Views)

Re: REVIT Architecture 2013 GBXML Window thermal materials missing

01-24-2013 07:59 PM in reply to: AnnaOscarson

Dear Anna,

Thanks so much for the reply!

I understand that point now.  

I have anther question, it seems that no matter what window materials I choose in revit architecture 2013, what exports in gbXML is  this material: WindowType id="GSP4R" . 

Can Revit Architecture only export this default window material ?  What could I do so as to export any window material I choose in Revit?

 

Another question is, is there any rules explaining how Revit rename those items and objects of each surfaces when exporting to a gbXML file? For example, for a door, it seems that it is always named as 

"lay-MDOOR'.  And one example name of wall surface is "T-1-E-R-6", which seems to be related with the direction of this wall. ....  do you know any material that can explain the exporting rules between Revit Architecture and gbXML file? 

 

Thanks so much!

Best,

Na 

 

Employee
AnnaOscarson
Posts: 30
Registered: ‎07-16-2007
Message 8 of 12 (514 Views)

Re: REVIT Architecture 2013 GBXML Window thermal materials missing

01-25-2013 03:20 AM in reply to: nyu

Hi,

The “window type id” can be changed by changing the Analytic Construction assigned to the Window Type. (To do that: In Revit select a window > in Properties palette click "Edit Type" > scroll down to the section “Analytical Properties” > edit the Analytic Construction to a construction that match your design.)

 

You can find information about naming “rules” on the Autodesk WikiHelp, please see this page: http://wikihelp.autodesk.com/Revit/enu/2013/Help/00001-Revit_He0/3251-Referenc3251/3325-gbXML_Sc3325...

 

Thanks,

Anna



Anna Oscarson
QA Analyst
Building Design and Collaboration, IPG
Autodesk, Inc.
Contributor nyu
Contributor
nyu
Posts: 14
Registered: ‎09-24-2012
Message 9 of 12 (382 Views)

Re: REVIT Architecture 2013 GBXML Window thermal materials missing

04-19-2013 08:41 PM in reply to: AnnaOscarson

Dear Anna, 

I just have some confusions about the window's SHGC properties again here. So in the gbXMl file, the SHGC property is showed in this way with 7 different values, six of them are corresponding to six different indicent angles, but how about the seventh one? Is that the averaged SHGC value that is usually interpreted by other energy analysis software such as "Energy+" when a simple window methos is used ?

 

<WindowType id="GSP4R">
<Name>1/8 in Pilkington single glazing</Name>
<Description>1/8 in (3 mm) Pilkington single glazing</Description>
<U-value unit="WPerSquareMeterK">6.7069</U-value>
<SolarHeatGainCoeff unit="Fraction" solarIncidentAngle="0">0.86</SolarHeatGainCoeff>
<SolarHeatGainCoeff unit="Fraction" solarIncidentAngle="40">0.84</SolarHeatGainCoeff>
<SolarHeatGainCoeff unit="Fraction" solarIncidentAngle="50">0.82</SolarHeatGainCoeff>
<SolarHeatGainCoeff unit="Fraction" solarIncidentAngle="60">0.78</SolarHeatGainCoeff>
<SolarHeatGainCoeff unit="Fraction" solarIncidentAngle="70">0.67</SolarHeatGainCoeff>
<SolarHeatGainCoeff unit="Fraction" solarIncidentAngle="80">0.42</SolarHeatGainCoeff>
<SolarHeatGainCoeff unit="Fraction">0.78</SolarHeatGainCoeff>
<Transmittance unit="Fraction" type="Visible">0.90</Transmittance>
</WindowType>

 

Here is the description in the gbXML scheme. 

 

SolarHeatGainCoeff

The center of glass solar heat gain coefficient. Each SolarHeatGainCoeff element can have a SolarIncidentAngle attribute indicating the Incident angel of the SHGC value. If there is no SolarIncidentAngle attribute, this indicates it’s diffuse.

The SHGC value is the fraction of incident irradiance that enters through the glazing and becomes heat gain.

 

 

 

Thanks so much!!

Best,

Na 

Employee
AnnaOscarson
Posts: 30
Registered: ‎07-16-2007
Message 10 of 12 (353 Views)

Re: REVIT MEP 2012 GBXML Window Interpretation

04-23-2013 04:22 PM in reply to: Toddg123

Hi Na,

The ability to have additional SolarHeatGainCoeff values for Openings and WindowTypes for different angles was added in schema version 0.37. The element without an angle is the “legacy” value prior angles were added.

 

Hope that explains it.

 

Anna



Anna Oscarson
QA Analyst
Building Design and Collaboration, IPG
Autodesk, Inc.

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