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<p class=MsoNormal><span style='color:#1F497D'>I am going to touch on a couple
issues that haven’t been mentioned yet. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>First let me start off by saying
that 3<sup>rd</sup> party software representatives replying to this thread
saying their software works great makes me cringe a little bit, so any
recommendations in that regards should be taken with a grain of salt. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The underlying issue here is
whether or not BIM models should even be linked to energy models at all. I have
done extensive research on the topic you have brought up and ultimately come to
the conclusion that at this point in time BIM models and their relative
analytical loads model should be independent of any energy modeling that needs
to be done either for code compliance, LEED documentation, LCC etc. (Just
one thing. The integration of heating and cooling loads inside BIM models is
absolutely amazing and the parametric workflow in Revit works flawlessly such
as auto resizing of outlets, terminals and equipment so I don’t want to
confuse the two here)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The issue is this. The typical
workflow of energy modeling is that architects define the geometry,
programmatic layout and material selection at which point the building is
handed over to the engineers who design the system and usually also perform the
energy modeling do the complexity of modeling MEP building energy and water
systems. The problem with this workflow is that the geometry, program and
materials are constantly changing and the links from BIM to GBXML or IFC and
then to the energy modeling software is not parametric. Changes that are made
architecturally are not easily integrated into a pre-existing energy model.
Things get deleted and move around and your systems will need to be re-defined
and that’s even if the software supports GBXML
“re-importing”.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The other issue is defining the
zones themselves. This is almost entirely controlled by the architect. In Revit
room bounding objects are controlled by the architect. The ability to merge
rooms in into one thermal zone is an extra step. In fact the whole creation of
spaces and zones is a step that has to be taken, which really means if you are
going to have to fiddle with room bounding objects like walls and ceiling and
the splitting of perimeter zones with space partitions why not do it from
scratch. The geometry portion of an energy model is the quickest step anyway,
(usually). <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Then there is the issue of
whether or not the software you have used for years can accept GBXML or IFC and
if so how clean does It get imported? So you may be forced to learn new
software (IES or TAS) which may not even model some important systems like the
water-side components or CHP and power generation as accurately as your tried
and true DOE based software, E+, etc. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I am leaving out a lot here, but
you get the point. This isn’t cut and dry and you may find its best to
stick with HAP or whatever you are comfortable using until these issues can get
resolved to ultimately provide a more flexible and parametric workflow. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>On the positive side, GBS is a
great tool though if you want rough estimates (SD) on energy use without the
detail that other software provides. It is quick to set up and test ECM
scenarios. IES also has similar “SD” level tools in their
IES-Toolkits which offer good early level analysis components.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt;line-height:15.0pt'><span
style='font-size:8.0pt;font-family:"Arial Black","sans-serif";color:#1F497D'>Alan
Jackson, LEED AP<br>
KlingStubbins</span><span style='color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Bonafe, Wes<br>
<b>Sent:</b> Thursday, October 08, 2009 8:38 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] BIM<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Is anyone aware of a good way to get REVIT to report or
assist in reporting building energy use? We currently use HAP however are
not opposed to purchasing new software.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks;<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Wes<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Wes
Bonafe, P.E.</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
Chief Mechanical/Plumbing Engineer<br>
Vice President<br>
LEED Accredited Professional<br>
<br>
<b>MOSELEY ARCHITECTS</b> <br>
Architecture. Engineering. Interiors. Planning<br>
3200 Norfolk Street<br>
Richmond, VA 23230<br>
804.794.7555<br>
FAX 804.355.5690<br>
<a href="http://www.moseleyarchitects.com">www.moseleyarchitects.com</a><br>
<a href="http://www.moseleyprojects.com">www.moseleyprojects.com</a></span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";
color:green'><br>
Please consider the environment before printing this e-mail.</span><o:p></o:p></p>
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