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<p class=MsoNormal><span style='color:#1F497D'>My practice with all load
calculation/energy modeling software has been:<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'>All floors/roofs: Top of surface<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Exterior glazing/walls: Outermost
surface<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Interior walls/partitions:
Center of construction<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 know this is the advice
offered by IES-VE’s support staff, but that doesn’t mean all modeling
engines behave the same. As you may gather, I’ve always assumed
energy modeling and HVAC load calculation models “subtract out” the
thickness of constructions from calculated space volumes. I don’t
know whether this is a “universal standard practice” between
software packages / modeling engines.<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'>Since I would ultimately much
rather slightly oversize than undersize an HVAC system, I’m of the
mindset that the potential for a little extra surface area / conditioned space
would if anything bump my results in a desired, conservative direction regarding
space loads. If absolute accuracy is your goal, then in lieu of a “universal
standard,” I’d imagine you would have to ask the developers/users
of the specific program you’re using at the moment to determine its true
behavior in this regard.<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'>~Nick<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'><img width=119 height=37
id="_x0000_i1026" src="cid:image002.jpg@01CA32D8.02BE9690"
alt="cid:489575314@22072009-0ABB"></span><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</span><span
style='font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west
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<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913
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<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913
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<p class=MsoNormal><i><span style='font-size:10.0pt;color:#2D4D5E'>Check out
our new web-site @ </span></i><span style='color:#1F497D'><a
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style='font-size:10.0pt;color:blue'> </span></u><span style='color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<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>Ryan Del
Balso<br>
<b>Sent:</b> Friday, September 11, 2009 11:50 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Where should you choose your wall location
forsimulations, inside, outside or center of wall<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Are there standard practice recommendations for where to
place your wall for a simulation? Knowing every wall has thickness, but
the simulation engines are generally just using no thickness walls with a
calculated U/R value, where should you define your walls for the simulation?
Should they be defined at the exterior face of the wall, the interior face or
the center of the wall. It seems the exterior face can greatly increase
the zone volume, thus incorrectly determining the energy usage, but the
interior face underestimates the exterior exposure of the wall. The
center of wall seems a good compromise, but is difficult to identify and
draw. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>For interior walls/zone delineation the same question
applies. From an energy standpoint is it better to place the zone
boundary on the face of the higher load zone or the lower load zone or split
the difference?<o:p></o:p></p>
<p class=MsoNormal>Thanks for any advice or direction to standard practices.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:2.25pt;
mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
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<p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:2.25pt;
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