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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'>Wow, that’s kind of alarming to hear. I always assumed the U-value was more important. I approximate the framing effect by first inputting the ASHRAE 90.1 assembly for a given wall/roof type, then reduce the R-value of the insulation (not the other values) until the U-value matches the value listed in Table A3.3 for the given amount of continuous insulation. Then I would add in the additional layers of construction (like brick veneer, block, etc..) that are in the actual design but not part of the basic ASHRAE tabulated assemblies. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:Magneto;color:#1F497D'>Matt Scott<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>N.E. Fisher & Associates, Inc.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>329 East Second St, 2<sup>nd </sup>Flr<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Boyertown, PA 19512<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>e: mscott@nefisher.com<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>p: 610-369-3190<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>f: 610-369-3194<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"'> hap-users-bounces@lists.onebuilding.org [mailto:hap-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Michael Hardy<br><b>Sent:</b> Friday, January 25, 2013 1:01 PM<br><b>To:</b> hap-users@lists.onebuilding.org<br><b>Subject:</b> [Hap-users] Wall Assembly - Steel Stud Framing<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The Wall Properties Input Screen calculates the overall R and U values for a sandwich assembly however it doesn’t have any way to factor in the “framing effect” of wall studs which can have a significant effect on average wall assembly R and U values.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>When I queried Carrier, part of Craig’s reply was for cooling design loads and energy modeling, “…U-value is not important, what is important is making sure the specific heat, density and weight of the composite insulation/stud layer is correct. Those values are used in the TFM equations not U-value.” <o:p></o:p></p><p class=MsoNormal><b><o:p> </o:p></b></p><p class=MsoNormal>Since this isn’t as simple as inputting an overall U-Value from ASHRAE, Has anyone come up with a way to effectively model steel stud framing that would pass a DOE review?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>Michael L. Hardy, PE, F.NSPE</span> <br><span style='font-family:"Tahoma","sans-serif"'>Black Oak Engineering, Inc.<br></span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black'>Cell 503.314.5244</span> <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>