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<p class=MsoNormal><span style='color:#1F497D'>Hey Seth:<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'>Check with the title 24 folk in
CA. I believe they have/had tables and <a
href="http://www.buildex.com/smartwall/tables/tpocmw.html">http://www.buildex.com/smartwall/tables/tpocmw.html</a>
buildex has some tables showing differing constructions HC.<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Andy Hoover<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Principal<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The BEST Consultant, Inc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Cell: 678-793-1159<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Office: 678-200-7648<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Fax: 678-827-0574<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Email:
andyhoover@thebestconsultant.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Web: www.thebestconsultant.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Times New Roman","serif";
font-variant:small-caps;color:#1F497D'>LEGAL DISCLAIMER<br>
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<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>Seth P.
Spangler<br>
<b>Sent:</b> Wednesday, March 24, 2010 9:44 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] ASHRAE 90.1 "HC" heat capacity<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hello,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>ASHRAE
defines a mass wall as a wall having a heat capacity (HC) of greater than 7
BTU/ft<sup>2</sup> * F but I have been unable to find this property listed in
tables of building materials. I am trying to calculate the heat capacity of a
CMU wall and would like to confirm that my calculation methodology is correct.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Per
ASHRAE 1997 Fundamentals:<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>8”
concrete block – two cores filled with concrete (normal weight) – ~130 lb/ft<sup>3</sup><o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thickness
.67 ft<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Specific
Heat ~ 0.22 BTU/lb * F<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Therefore
NC =(130 lb/ft<sup>3</sup> )*(.67 ft)*(0.22 BTU/lb * F)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>NC=19.16<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Using
this methodology even a 4” brick wall has a HC greater than 7 (7.5 to be
exact).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks
in advance.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif"'>Seth
Spangler, LEED® AP <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif"'>Project Engineer<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Georgia","serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif"'>RMF
Engineering, Inc <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif"'>Ph:
(843) 971-9639 ext:1497</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif"'>Fax:
(843) 971-9641 <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif"'>sspangle@rmf.com</span><o:p></o:p></p>
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