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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Aaron,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Uninsulated assemblies are discussed in the User’s Manual for ASHRAE Standard 90.1. Page G-14 of 90.1-2010 User’s Manual suggests:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>“It is acceptable to model [projecting balconies] as having the depth of the exterior wall they penetrate. For example, if the wall between the intermediate floor slabs has a total depth of 8 in. (203mm), then these assemblies can be modeled as being 8 in. (203 mm) thick. If the concrete slab that forms the projecting balcony or intermediate floor slab for a particular floor is 9 in. (229 mm) thick, then this section of the all would be modeled in the proposed design as a 9 in. (229 mm) high uninsulated concrete wall that is 8 in. (203 mm) thick.”<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Bill<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><img width=496 height=123 id="Picture_x0020_1" src="cid:image001.jpg@01CC2CDB.409AD290" alt="Signature in jpg form"><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Brian Fountain<br><b>Sent:</b> Friday, June 17, 2011 10:39 AM<br><b>To:</b> Aaron Smith<br><b>Cc:</b> bldg-sim@lists.onebuilding.org<br><b>Subject:</b> Re: [Bldg-sim] Balcony Heat Loss<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The accepted workaround is to add another wall type that is comprised of 12" of just concrete (U = 5.5 W/sq-m C) and has a height equal to your slab thickness -- say 6". So the area would be the wall length x the slab thickness.<br><br>Not sure if this is clear -- it is better described on page 7-9 of the EE4 modelling guide.<br><br>Brian<br><br>On 6/17/2011 10:20 AM, Aaron Smith wrote: <o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hello,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>When performing energy modeling to determine compliance with the Canadian Energy Code (MNECB), penetrations through the building envelope must be taken into account when calculating wall R-values if their area exceeds 2% of envelope area. I’m working on a LEED project and trying to calculate the wall R-value of a Hotel taking into account heat losses from the balconies which are extensions of the floor slab (balcony penetrations exceed 2% of envelope area).</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I realize this is a rather complex heat transfer problem but hope there may be an easy approximation. My first thought was to treat them like a parallel path heat transfer problem: 1/Req = %slab/Rslab + %wall/Rwall but I’m thinking that may not be fair (perhaps this would be used if you had concrete studs in the wall). My other thought is to treat the slab penetrations as a separate wall type (uninsulated concrete wall) – this would have a reduced affect on the overall wall R-value. </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Does anyone have thoughts on this?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Aaron</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:27.0pt'><strong>Aaron Smith, </strong><em><span style='color:gray'>P.Eng</span> </em><o:p></o:p></p><p class=MsoNormal style='margin-left:27.0pt'><i><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:gray'>LEED® AP BD+C,</span></i><i><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'> M-ASHRAE, Mechanical Engineer</span></i><o:p></o:p></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Verdana","sans-serif"'><img width=170 height=35 id="_x0000_i1025" src="cid:image002.jpg@01CC2CDB.409AD290"></span><o:p></o:p></p><p class=MsoNormal style='text-indent:27.0pt'><span lang=FR style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'>t: (902) 422-7393</span><o:p></o:p></p><p class=MsoNormal style='text-indent:27.0pt'><span lang=FR style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'>f: (902) 423-4945</span><o:p></o:p></p><p class=MsoNormal style='text-indent:27.0pt'><span lang=FR style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'>e:</span><span lang=FR style='font-size:9.0pt;font-family:"Verdana","sans-serif"'> </span><span style='font-size:9.0pt;font-family:"Verdana","sans-serif"'><a href="mailto:asmith@mreng.ca"><span lang=FR>asmith@mreng.ca</span></a></span><o:p></o:p></p><p class=MsoNormal><span lang=FR> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:6.0pt;font-family:"Verdana","sans-serif";color:#777777'>The electronic message contained herein is private and confidential, intended only for the recipient(s) specified. 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