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<p class=MsoNormal><span style='color:#1F497D'>Hi Ross,<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'>Rest assured, thermal mass properties
of defined envelope/partition/floor constructions *are* indeed tied up in those
construction definitions. If you’re taking the time to define your envelope
construction layers, then you’ve already done a pretty good job of accounting
for critical areas of the building’s thermal mass.<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'>Thermal mass inside spaces (i.e.
furniture) is definitely one of those variables you shouldn’t have to
think about (beyond the defaults) for most projects, but it can grow into a
pretty big deal in extreme cases. The loads for a “greenroom”
style enclosed pool might fluctuate pretty wildly, requiring much larger heating/cooling
equipment to avoid unmet hours, if it weren’t for the body of water
acting as a thermal “battery,” tempering the temperature swings.
Other examples where thermal mass could be critical to the model’s
behavior would include aquariums, south-facing sunrooms, envelopes in arid
climates with crazy diurnal (night/day) temperature swings like Arizona, and in
earth-shelter (“half-buried”) buildings/homes where the concept can
be taken to extremes as an energy saving feature (<a
href="http://earthshelters.com/free/chapter-1/">http://earthshelters.com/free/chapter-1/</a>).<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'>In short: for most models, the
interior furniture custom weighting factor is not a huge deal, but in select
cases it can be. I would leave it at defaults and keep it in the back of
your head as a potential area to troubleshoot/consider should you come across
unmet hours or otherwise inexplicable space load behavior.<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 border=0 width=119
height=37 id="_x0000_i1030" src="cid:image005.jpg@01CC21CB.B5D2F1C0"
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, P.E.</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<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>Smith &
Boucher Engineers</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
valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913
344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913
345.0617<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><a href="www.smithboucher.com"
title="blocked::www.smithboucher.com"><span style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
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>
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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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Ross
Farris<br>
<b>Sent:</b> Thursday, June 02, 2011 4:48 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Internal Loads: Internal Mass<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Howdy Y’all,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Wondering if anyone out there has attempted to look at the
change in simulation results if you start changing the internal mass properties
under the internal loads tab in version 3.64. I have always left these as
default because it seems fishy to me and I don’t trust it. It would seem
that the floor weight should be accounted for when defining the construction
properties. Not sure why there would be two places to input this information. I
know that the density of furniture COULD have an effect on the HVAC equipment’s
ability to maintain the desired conditions in certain building types, but I
don’t know how much the impact would be in the modeling world.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I know this is a feature that Energy Plus is attempting to
perfect as well, but quite frankly it all seems a bit bogus to me. In theory
this could make our models much more accurate if we spent the time to dial
everything in properly, but there are so many other features in eQUEST to worry
about that I don’t want to waste my time with these categories if they
don’t make the simulations more accurate. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Any feedback from others experience would be appreciated. <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><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Ross
Farris</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Energy
Analyst</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
<br>
</span><a href="http://www.glumac.com/"><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";text-decoration:none'><img border=0
width=343 height=41 id="Picture_x0020_1"
src="cid:image006.gif@01CC21CB.B5D2F1C0"
alt="http://www.glumac.com/glumacsig.gif"></span></a><span style='font-size:
12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:.5in'><span style='font-size:9.0pt;
font-family:"Arial","sans-serif"'>150 California Street, 3rd Floor</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>San
Francisco, CA 94111</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>T.
415.398.7667 ext.4083 F. 415.398.0596<br>
</span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#333333'>Thinking. Inside the building.<o:p></o:p></span></b></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#1F497D'> </span><a
href="http://twitter.com/GlumacEngineers" target="_blank"><span
style='text-decoration:none'><img border=0 width=22 height=22
id="Picture_x0020_3" src="cid:image007.png@01CC21CB.B5D2F1C0"
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style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#333333'><a
href="http://www.glumac.com/">www.glumac.com</a></span><span style='font-size:
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</span><a href="http://www.glumac.com/"><span style='font-size:12.0pt;
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width=309 height=23 id="Picture_x0020_5"
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