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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Good morning Gentlemen,<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'>Actually, the C-factor for below grade walls is the value of
conductance for a given thickness of material and is basically the inverse of an
R-value for a given thickness i.e. R=1/C. For the concrete in a below grade
(BG) wall, the overall C in the baseline BG wall should be 1.140 - see Table 4
in Chapter 26 of <i>2009 ASHRAE Fundamentals Handbook</i>.<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'>The wall assembly in the software should include the exterior soil,
the concrete (with total C=1.140), and the interior airfilm.<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'>I hope this helps. Have a nice day.<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;color:#76923C'>Sheila Sagerer<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#76923C'>Energy
Engineer, EIT, LEED AP<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#76923C'>Energy
Opportunities, Inc, a 7group company<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#76923C'>Phone:
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<p class=MsoNormal><span style='font-size:10.0pt;color:#76923C'>www.sevengroup.com<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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>Nick Caton<br>
<b>Sent:</b> Thursday, April 15, 2010 10:02 AM<br>
<b>To:</b> sambhav tiwari; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] U Value<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Sambhav,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Don’t
have my copies of 90.1 handy.. but I think I can guide your questions –
do ask again if I’m missing the mark.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2;
text-autospace:none'><![if !supportLists]><span style='font-size:10.0pt'><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>While
your units look about right for a U-value (Btu/h·ft2·°F), baseline underground
walls, in 90.1-2004, are defined with a C-factor, not a U-factor.
Appendix A section for underground walls explains how it’s different from
U-factor (I think C basically excludes air films), and has a table you can
reference to find a C-value from chapter 5. Between that table and the relevant
appendix A text section, you can build a custom construction to match the
C-value specified.</span><span style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>I
don’t think there’s any specific guidance regarding
wall/floor/partition construction absorptance values in 90.1. It’s
one of those things that fall generally into “match the proposed.”
90.1 does specify “solar reflectances” for roofs only, and we
handle those (somewhat indirectly) through the absorptance inputs for roof
constructions.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.25in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Hope
this helps,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>~Nick<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>
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color:#1F497D'><img width=119 height=37 id="Picture_x0020_1"
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<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'>PROJECT ENGINEER</span><span style='font-size:7.5pt;color:#CC9900'><o:p></o:p></span></p>
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color:#2D4D5E'>Check out our new web-site @ </span></i><span style='font-size:
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<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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>sambhav
tiwari<br>
<b>Sent:</b> Thursday, April 15, 2010 6:55 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] U Value<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi All,<br>
What
should be U value for below grade walls for basline is it 1.14
btu/hrsqft2F. and how much should i consider absoptamce fro base line below
grade walls.<br>
<br>
I look forward for your response.<br>
<br>
Thanks<br>
Sambhav Tiwari.<o:p></o:p></p>
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