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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Tom,<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'>You’ve stumbled onto one of the items that needs to be
updated in the next version of E-Quest. The F-factor is not the same as
the U-factor you’ve indicated on the attached document. The way to
correctly account for the heat loss through the slab perimeter is to correlate the
F factor to an equivalent U value for input into the program. Take a look
at the 2009 ASHRAE fundamentals Chapter 18.30-32 equations 35, 41, and 42 for
how to do this. Inputting the F-factor directly for the U value could
greatly skew the heat loss that occurs through the slab.<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'>Sincerely,<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:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Michael Daley, PE <br>
Mechanical<br>
</span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>HARGIS ENGINEERS</span></b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#1F497D'> <br>
600 Stewart Street <br>
Suite 1000 <br>
Seattle, WA 98101 <br>
<a href="http://www.hargis.biz"><span style='color:gray;text-decoration:none'>www.hargis.biz</span></a>
<br>
<br>
</span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:gray'>d | </span></b><span style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:gray'>206.436.0469</span><span style='font-size:
10.0pt;font-family:"Arial","sans-serif";color:#1F497D'> </span><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>c | </span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>206.914.5587
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'><br>
</span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:gray'>o | </span></b><span style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:gray'>206.448.3376 <b> f | </b>206.448.4450</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'> </span><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"'> Eckwahl, Tom
[mailto:TEckwahl@karpinskieng.com] <br>
<b>Sent:</b> Friday, February 26, 2010 10:29 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] F-Factor<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"'>What
is the consensus on where F Factor should be input? I have been putting
it under the underfloor material data (see attached).<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"'>Is
this 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 style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Thomas
N. Eckwahl<br>
Project Engineer, Mechanical</span><span lang=EN style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><span
lang=EN style='font-size:13.5pt;font-family:"Arial","sans-serif";color:red'>karpinski<br>
</span><span lang=EN style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>ENGINEERING</span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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