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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:12.0pt'>Joshua –<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>Confining my comments to eQUEST:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>There appears to be a quick shortcut we’ve tried on some models:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>eQUEST appears to create virtual materials with virtual R-vals to turn the UA product into the appropriate F-Perim product anticipated by ASHRAE.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>This step occurs when exiting the Wizard mode – ie pushing the “Finish” button.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>Floor slabs specified as slabs-on-grade will often have a virtual material in their layer definition – this virtual material’s resistance will vary, and I believe it may be varying based on the ratio of perimeter to surface area.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>If you’ve done all your zoning within the wizard, then it is possible to get eQUEST to automatically generate the different “virtual material” resistance factors for each of the different room’s slab surfaces, if you need to vary slab insulation, and if the slab insulation options available in the Wizard include the option you’re looking for.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>Assuming you’ve left wizard mode, you can save the project as a separate file name (so as not to over-write any detailed edit changes), re-enter Wizard mode, reselect the slab insulation you would like, and “Finish” the wizard. The virtual material resistances will have changed. Then these virtual resistances can be copied to the virtual materials you have in the “real” detailed data edit file.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>A caution – I haven’t validated that this produces the exact correct factors to translate eQUEST’s modeled area into the <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>Has anyone else on the list looked into this procedure?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><div><p class=MsoNormal style='line-height:150%;text-autospace:none'><b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>Aaron Dahlstrom , PE, LEED® AP</span></b><o:p></o:p></p><p class=MsoNormal style='line-height:150%;text-autospace:none'><b><span style='font-family:"AvantGarde Bk BT","sans-serif";color:#17365D'>In P</span></b><b><span style='font-family:"AvantGarde Bk BT","sans-serif";color:#619428'>o</span></b><b><span style='font-family:"AvantGarde Bk BT","sans-serif";color:#17365D'>sse</span></b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'> – </span><span style='font-size:8.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>A subsidiary of</span><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'> </span><b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:#CC0000'>AKF</span></b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>| 1500 Walnut Street, Suite 1414, Philadelphia, PA 19102 </span><o:p></o:p></p><p class=MsoNormal style='line-height:150%;text-autospace:none'><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>d: 215-282-6753| m: 267-507-5470| In Posse: 215-282-6800| AKF: 215-735-7290</span><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'>e: ADahlstrom@in-posse.com | in posse web: <a href="http://www.in-posse.com/">www.in-posse.com</a> | akf web: <a href="http://www.akfgroup.com/">www.akfgroup.com</a></span><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'> </span><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'> </span><o:p></o:p></p></div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Times New Roman","serif";color:gray'> </span><span style='font-size:12.0pt'><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@01CC62BF.562F7C90"><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. 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