<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.msonormal0, li.msonormal0, div.msonormal0
{mso-style-name:msonormal;
mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.EmailStyle18
{mso-style-type:personal;
font-family:"Calibri",sans-serif;
color:windowtext;}
span.EmailStyle19
{mso-style-type:personal;
font-family:"Calibri",sans-serif;
color:windowtext;}
span.EmailStyle21
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>You can also use the approach in Ashrae Fundamentals Chap 18, p. 39, or from Ashrae 90.1-2010 Appendix C (C.6.10.1).<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Shaun Martin LEED-AP, BEMP<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Principal<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Shaun Martin Consulting<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>ph. 604-789-1095<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US>From:</span></b><span lang=EN-US> Equest-users <equest-users-bounces@lists.onebuilding.org> <b>On Behalf Of </b>Nathan Miller via Equest-users<br><b>Sent:</b> July 23, 2019 7:16 AM<br><b>To:</b> Konstantina Kalliakoudi <kalliakoudi.k@gmail.com><br><b>Cc:</b> equest-users@onebuilding.org<br><b>Subject:</b> Re: [Equest-users] Floors F- factor to Uvalue for equest input<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>You can search the archives for the thread titled “Slab on Grade Floor Heat Loss” but here is how I personally handle F-factor to U-factor conversions: <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><i><span lang=EN-US>In the past I’ve done a conversion of F-factor (perimeter based) slab-on-grade heat loss to U-factor (area) and input that in on a zone-by-zone basis if I really wanted to nail down SOG heat loss. <o:p></o:p></span></i></p><p class=MsoNormal><i><span lang=EN-US><o:p> </o:p></span></i></p><p class=MsoNormal><i><span lang=EN-US>Example- Space is 20’ x 30’, but the exposed perimeter is only two of the faces (20’ + 30’). Let’s say it is uninsulated SOG. <o:p></o:p></span></i></p><p class=MsoNormal><i><span lang=EN-US><o:p> </o:p></span></i></p><p class=MsoNormal><i><span lang=EN-US>F-factor from 90.1: F = 0.73 Btu/(hr*ft*F)<br><br>Perimeter based heat loss: 0.73 Btu/(hr*ft*F) * 50 ft = 36.5 BTU/(hr *F)<o:p></o:p></span></i></p><p class=MsoNormal><i><span lang=EN-US><o:p> </o:p></span></i></p><p class=MsoNormal><i><span lang=EN-US>Then we can back-calculate the U-factor to assume for the whole floor to equate to that heat loss: 36.5 BTU/(hr *F) = 600 SF * X BTU/(hr*SF*F) -> U = 0.0608 BTU/(hr*SF*F)<o:p></o:p></span></i></p><p class=MsoNormal><i><span lang=EN-US><o:p> </o:p></span></i></p><p class=MsoNormal><i><span lang=EN-US>You can create a custom floor construction for each space to provide the U-factor to produce equivalent heat loss that the F-factor calcs are telling you lose. For purely core zones (no exposed perimeter), I guess the F-factor calcs are telling us were not really losing heat through that slab (doesn’t’ seem right, but it probably is relatively small) .<o:p></o:p></span></i></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:1.0pt;margin-right:0cm;margin-bottom:4.0pt;margin-left:0cm'><b><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana",sans-serif;color:#632423'>Nathan Miller, PE, LEED AP BD+C – </span></b><i><span lang=EN-US style='font-size:8.0pt;font-family:"Verdana",sans-serif;color:black'>Mechanical Engineer/Senior Energy Analyst</span></i><b><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana",sans-serif;color:#632423'><o:p></o:p></span></b></p><p class=MsoNormal style='margin-top:3.0pt;line-height:115%'><b><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#632423'>RUSHING</span></b><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F'> </span><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black'>|</span><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F'> </span><b><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#632423'>O</span></b><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#A50021'> </span><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black'>206-285-7100 |</span><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F'> </span><b><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#632423'>C</span></b><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#A50021'> </span><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black'>207-650-3942</span><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F'><o:p></o:p></span></p><p class=MsoNormal style='line-height:115%'><b><span lang=EN-US style='font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#632423'><a href="http://www.rushingco.com/"><span style='color:#632423'>www.rushingco.com</span></a></span></b><b><span lang=EN-US style='font-size:9.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#632423'><o:p></o:p></span></b></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US>From:</span></b><span lang=EN-US> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>> <b>On Behalf Of </b>Konstantina Kalliakoudi via Equest-users<br><b>Sent:</b> Tuesday, July 23, 2019 7:18 AM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] Floors F- factor to Uvalue for equest input<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><div><div><p class=MsoNormal><span lang=EN-US>Dear equest users,<o:p></o:p></span></p><div><p class=MsoNormal><span lang=EN-US>I am using equest for LEED projects.<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US>In table 5.5-1of ASHRAE 90.1-2010 the F factor is given for floors.<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US>How can F- factor be used in order to get Uvalue, which is needed in equest for floors?<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US>Thank you<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div><div><div><p class=MsoNormal><span lang=EN-US>Konstantina Kalliakoudi<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US>Mechanical Engineer Μ.Sc.<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US><a href="http://www.khmoe.gr/" target="_blank">www.khmoe.gr</a><o:p></o:p></span></p></div></div></div></div></div></body></html>