[Bldg-sim] 3D Modeling / Energy Analysis Compatibility

[Per Sahlin]

Warren,



Our approach to 3D IFC import is based on the observation that most 3D CAD
models have been - and in the future will be - formulated for other primary
purposes than thermal performance simulation. They are rarely appropriate as
is but an engineer needs to be able to control the mapping between model
spaces and thermal zones. Quite often a more or less manual selection will
be the most practical, e.g. the model may contain all the rooms of a
building and for the thermal model, you want to study perhaps a single floor
or a group of exceptional rooms.



Our thermal tool, IDA Indoor Climate and Energy 3.0, has it own 3D
geometrical modeler into which one may import an IFC 1.5.1 or 2.0 model as a
(3D) "background model". The user then instantiates the individual IFC
spaces or groups of spaces that he or she wishes to study. This has proven
to be a powerful time-saver and has been commercially available for about a
year.



Other information such as constructions may also be imported from the IFC
model, should they be present there. However, this is rarely the case in
today’s practice, where it seems that most 3D models are still defined for a
single purpose, such as making a visualization, rather than being a
generally applicable description of the building. We have seen some pretty
“interesting” 3D models from unaware CAD modelers.



There is a demo session showing a simple case of IFC import on
www.equa.se/ice



Best regards,



Per Sahlin





------------------------------------------
Per Sahlin,    EQUA Simulation AB
per.sahlin at equa.se
+46-8-27 27 67
+46 70 422 03 02 (mobile)
+46-8-27 40 32 (fax)
P.O. Box 1376
172 27 Sundbyberg, Sweden
http://www.equa.se
-----------------------------------------


-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com]On Behalf Of Warren A.
Campbell
Sent: Sunday, September 01, 2002 8:54 PM
To: Bldg-sim at gard.com
Subject: [Bldg-sim] 3D Modeling / Energy Analysis Compatibility


  Is anyone familiar with the progress the industry is making towards
integrating energy analysis software with some of the leading 3D CAD
programs (ArchiCAD, Revit)?

  Warren Campbell
  Millennium 3 Design Group
  (704) 333-1965.Ext 22

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