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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='color:#1F497D'>Aaron, <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>It seems like the reviewers are just looking for SOME documentation of how you established the U-Values for glazing. This is a LEED reviewer comment from a recent project I was working on. Note that this was a LEED-NC v2.2 job, hence the reference to ASHRAE 90.1-2004:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin:2.25pt'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:red'>“Please provide additional information to confirm that the framed assembly U-value was used for the Proposed Case windows (e.g. showing that the whole window assembly has been tested by NFRC, or verifying that LBNL Window5 calculations have been provided for the whole assembly, or verifying that the frame effects are captured within the energy modeling software), or revise the model referencing ASHRAE 90.1-2004 Table A8.2 if needed.”<o:p></o:p></span></b></p><p class=MsoNormal style='margin:2.25pt'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:red'><o:p> </o:p></span></b></p><p class=MsoNormal><span style='color:#1F497D'>For this particular project, there was no NFRC or Window5 data available, so we responded by giving them results both for the case where we entered the center-of-glass U-value and defined the frame effect in eQUEST, and then also the results for using the terrible default window assembly U-values from 90.1 Appendix A. It made about a 5% swing in the energy consumption, so obviously we hope they COG + frame effect results. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal style='margin-top:1.0pt'><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#632423'>Nathan Miller, PE, LEED<sup>®</sup>AP<o:p></o:p></span></b></p><p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:black'>Senior Energy Engineer/Mechanical Engineer<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:black'><o:p> </o:p></span></i></p><p class=MsoNormal style='line-height:115%'><b><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#632423'>D</span></b><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#BFAB7F'> </span><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:black'>206-788-4577</span><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#BFAB7F'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="http://www.rushingco.com/"><b><i><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:#632423'>www.rushingco.com</span></i></b></a><o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><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>Dahlstrom, Aaron<br><b>Sent:</b> Friday, December 16, 2011 6:56 AM<br><b>To:</b> Bldg-sim2 (Bldg-sim@lists.onebuilding.org)<br><b>Subject:</b> [Bldg-sim] window opinions?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt'>Folks:<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 quick survey:<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'>Are people using the NRFC standard rating conditions (including standard window unit sizes per <a href="http://www.nfrc.org/documents/1997_NFRC100.pdf">http://www.nfrc.org/documents/1997_NFRC100.pdf</a> Table 1 p15) for assembly u-factors for windows in the Proposed Case?<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'>I know the ASHRAE 5.8.2.4 references the NRFC 100 test, but I’m debating whether I should request custom calculations for my project’s windows at their actual size, or accept manufacturer’s standard literature based on the NRFC 100 rating sizes.<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'>I know I can explicitly define the frame and glazing, which I prefer to do, but sometimes it isn’t an option.<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'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><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";color:#17365D'>In P</span></b><b><span style='font-family:"AvantGarde Bk BT";color:#619428'>o</span></b><b><span style='font-family:"AvantGarde Bk BT";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: 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