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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>See attached.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><div><div><p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>Timothy Howe, MS, LEED® AP</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><br>Mechanical Engineer<br>Stantec<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>61 Commercial Street<br>Rochester NY 14614<br>Ph: (585) 413-5347<br>Fx: (585) 272-1814<br>Cell: (585) 330-8681<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:13.0pt;font-family:"Arial Narrow","sans-serif";color:blue'><a href="http://www.stantec.com"><b><span style='color:#993333;text-decoration:none'>stantec</span></b><span style='color:#003F6E;text-decoration:none'>.com</span></a> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='font-size:13.5pt;font-family:Webdings;color:#008040'>ü</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:blue'> </span><span style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif";color:#008040'>Please consider the environment before printing this email.</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:blue'> <o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><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>Talbert, Joshua<br><b>Sent:</b> Wednesday, August 24, 2011 10:49 AM<br><b>To:</b> bldg-sim@lists.onebuilding.org<br><b>Cc:</b> Neuburger, Bill<br><b>Subject:</b> [Bldg-sim] F-Factor<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Hello Bldg Sim Folks,<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Could anyone comment on how they “translate” the F-factor requirement for on grade slabs into a U-value / material for a floor construction in Energy+ or eQuest<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>My method has always been to create a fictional material with negligible thickness that approximates the equivalent R-value for the whole floor area of the zone based on the edge requirement. This results in me creating a separate one of these fictional materials for each zone. This is because even though a zone might have the same F-factor requirement the difference in perimeter to floor area ratio effects the actual heat flux through the floor, or so I think.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Here is an example of how I have modeled this, see attached picture for a layout:<o:p></o:p></p><p class=MsoNormal><img border=0 width=411 height=483 id="Picture_x0020_1" src="cid:image001.png@01CC624D.5809E8B0"><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>F-Factor = 0.64 (equivalent to R-10 insulation for 48” and for an “Unheated Slab” per ASHRAE 90.1 Table A6.3)<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Zone 1<o:p></o:p></p><p class=MsoNormal>Area = 25 sqft<o:p></o:p></p><p class=MsoNormal>Edge Perimeter = 10 ft<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Zone 2<o:p></o:p></p><p class=MsoNormal>Area = 375 sqft<o:p></o:p></p><p class=MsoNormal>Edge Perimeter = 70 ft<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Perimeter * F factor = Area * U value equivalent<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Zone 1 equivalent U = 0.256<o:p></o:p></p><p class=MsoNormal>Zone 2 equivalent U = 0.119<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>This process has made sense to me, but in reviewing this technique with a colleague we wondered what does everyone else do. Am I under/over predicting slab loss for certain zones with this method? Your comments and insight are always appreciated.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Josh<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:Papyrus;color:#003366'>Joshua W. Talbert </span><span style='font-size:10.0pt;font-family:"Times New Roman","serif";color:#003366'>P.E., LEED-AP</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:Papyrus;color:#003366'>Mechanical Engineer</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:16.0pt;font-family:"Arial","sans-serif";color:#003366'>Hallam</span><b><span style='font-size:16.0pt;font-family:"Arial Black","sans-serif";color:#CC3300'>///</span></b><span style='font-size:16.0pt;font-family:"Arial","sans-serif";color:#003366'>ICS</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#003366'>38 Eastwood Dr. Suite 200</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#003366'>S. Burlington, VT 05403</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#003366'>P: (802) 658-4891</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#003366'>F: (802) 658-1457</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#003366'> </span><o:p></o:p></p></div><p class=MsoNormal> <o:p></o:p></p></div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><div class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><hr size=2 width="100%" align=center></span></div><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'><br><br>CONFIDENTIALITY NOTICE:<br>The information contained in this transmission, as well as any accompanying documents, constitutes confidential and/or legally privileged information which is the property of Hallam-ICS. The information is intended solely for the individual entity named on this transmittal sheet. If you are not the designated recipient, you are hereby notified that any disclosure, copying, distribution or taking any action in reliance on this information is strictly prohibited. If you received this in error, please contact the sender and delete the material from any computer. Opinions, conclusions and the information in this message that do not relate to the official business of my firm shall be understood as neither given nor endorsed by it.</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p></div></body></html>