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<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 lfo1;
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 (</span><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif"'>Btu/h·ft2·°F</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>), 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 lfo1'><![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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=119 height=37 id="Picture_x0020_1"
src="cid:image001.jpg@01CADC78.20167790" alt="cid:489575314@22072009-0ABB"></span><b><span
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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>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>25501 west valley parkway<o:p></o:p></span></p>
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color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>direct 913 344.0036<o:p></o:p></span></p>
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color:#2D4D5E'>fax 913 345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Check out our new web-site @ </span></i><span style='font-size:
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href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt;color:blue'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue'> </span></u><span
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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>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>
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<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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