[BLDG-SIM] Green Building Studio

Brandon Nichols BrandonN at Hargis.biz
Thu Mar 22 09:22:40 PDT 2007


Sangeetha
 
As someone who spent a man month or so last July and August working with
a complex multi-use facility, detailing it up in Autodesk Building
Systems 2006 using the espace feature, exporting to gbXML and running
the output through Greenbuilding studio (GBS), I can tell you the
resulting model did not meet my expectations for simplicity of analysis.
Many of the most fundamental issues were in the AutoCAD to gbXML export
process, however there are other issues related to the differences
between the model created by GBS and a comparable one resulting from the
eQuest design development wizard. 
 
Models prepared by the alternate paths are not interchangeable; the GBS
model can only be edited going forward by the detailed editor. If you're
an expert at the detailed editor and manipulating .inp and other files
with a text editor, you may not find this disadvantageous.  However we
found that going back over the model and establishing all of the shell,
space, polygon, zone, system, schedule and many other relationships that
would otherwise have been set up by the eQuest wizard cost more time
going forward than was saved up-front -- for example, using the eQuest
DD wizard to add windows, doors, or skylights and set up daylighting is
more efficient than doing it in detailed edit mode, but wizard editing
is unavailable to the GBS model.  And I might add that adding windows
and doors in the eQuest DD wizard is also much easier than doing it in
ABS.
 
Perhaps GBS interoperability improvements have been made in the interim;
John Kennedy at Greenbuilding studio may be able provide current status,
There may also have been improvements to the gbXML export in ABS/ADT
2007 and Revit or the soon-to-be released ABS 2008, however I haven't
been keeping up since we're standardized on ABS 2006 for at least a
couple of years.   
 
I think the gbXML interoperability process shows great progress and
promise, and I hope the implementation kinks we observed last summer
either have been or are the process of being worked out soon.  
 
 
Brandon Nichols
 


  _____  

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of
Sangeetha Divakar
Sent: Wednesday, March 21, 2007 10:36 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Green Building Studio


Hi,
Has anybody had experience using Green Building Studio for energy
analysis. Can you please clarify on the reliability of a GBXML
translation of a BIM model. Is the process as easy as it seems? It is a
huge leap forward to have a BIM model coverted into an input file for
energy analysis in literally minutes.  Although, there must be some
advantages in having an energy analyst do take offs from a design
instead of depending entirely on a program that translates the BIM
model. Any inputs that will help me understand GBXML better will be
greatly appreciated.
Thanks a lot
Sangeetha Divakar

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