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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>1. In my perfect world preliminary energy models get built
during SD phase to assist the entire team with design decisions. What I normally
encounter is either a model done after the building design is set but the MEP
systems are still in flux or worse projects that were completing CDs and decide
they need to run energy models to get LEED certification. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>2. I think the complexity of the model depends on the
stage of a project. Models started in SD are usually very generic and not
very details. As the design progresses so does the detail of the model.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>3. I use Trane Trace<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>4. It depends on the stage of the project it is started in and
how much duplication of spaces can occur for a large building.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>5. I have found that the baseline model can be built very
quickly as long as you already have library members that cover the ASHRAE standards.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>6. I have had run times of several minutes to several
hours depending on the size of the building and whether or not full year
weather is required. I have found out that Trace runs 5 to 7 times slower
when using full year weather. Because of this when doing LEED models I
use part-year weather data until I get to the end and start working on data
that will be sent to USGBC.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>7. I use basic information, overall square footages,
window percentages, etc and the same type of generic information for the
building systems as well. I have had it vary wildly, but this is a
function of models that start in SD phase have a lot of stuff change between
the initial SD models and the final models.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>John Mathews, PE, LEED AP<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Senior Mechanical Engineer<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Project Manager<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Apogee Consulting Group, PA<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'><a href="http://www.acg-pa.com/">http://www.acg-pa.com</a><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<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"'>
trace-users-bounces@lists.onebuilding.org
[mailto:trace-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Sherie
E. Hensley<br>
<b>Sent:</b> Wednesday, April 01, 2009 1:47 PM<br>
<b>To:</b> trace-users@lists.onebuilding.org<br>
<b>Subject:</b> [Trace-users] How long it takes for energy modeling? HME<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<div>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I have done
several energy models over the last few years using Trane Trace. I have
heard others (typically from those who don't have experience with energy
modeling) say "it only takes a day" to create an
energy model and get results. <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I am trying
to get a better understanding of how long it takes others to complete an energy
model. I realize there are many factors involved and length of time can
vary drastically given the complexity of the project.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>For an xxx
sq ft project with xxx systems:<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>1.
What phase are you starting the energy model - SD, DD, CD?<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>2.
What information are you starting with - load results from another program,
rules of thumb for system sizing, etc?<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>3.
What program are you using?<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>4. How
long does it take to build the proposed model?<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>5. How
long does it take to build the baseline model (per ASHRAE 90.1-2004, Appendix
G)?<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>6. How
long does it take to calculate the results from the energy simulation program?<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>7. If
you have started a projected in the SD phase, how detailed is the input information
you use? How do the results compare to the energy model developed in CD -
within 10%?<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Any
information you can provide would be helpful.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks,<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Sherie
Hensley</span><o:p></o:p></p>
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