<html> <head> <meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <meta name=Generator content="Microsoft Word 10 (filtered)"> <style>  </style> </head> <body lang=FR link=blue vlink=purple> <div class=Section1> Hi Evan,   As with Achim, I don't understand what you mean by modelling a curtainwall with equivalent areas of glass and aluminium. Achim's numbers are quite fine, although performance can vary widely for both vision and spandrel panels - for a quick check on curtain wall performance (U) based on design options (namely size), you can look up FRAMEplus Online from Enermodal Engineering: http://p10a.enermodal.com/WebFPlus/SpandrelPage.aspx   There's a good eSim paper on the significance of curtain wall design options and energy performance (if that's what you're interested in): http://www.esim.ca/2002/documents/Proceedings/Session%203a-5.pdf   <div> - Denis </div>   -----Message d'origine----- De : esp-r-bounces@lists.strath.ac.uk [mailto:esp-r-bounces@lists.strath.ac.uk] De la part de Geissler Achim Envoyé : June 10, 2008 4:36 AM À : Evan Sterling; esp-r@lists.strath.ac.uk Objet : [esp-r] Re: Modelling curtain-wall vs. modelling windows   Hi Evan,   I am not quite sure what you mean by “equivalent areas” with “aluminum”, however here some rough guidelines (“European Standard” Curtain Walling):   Glass U-value 1.4 => typical curtain wall U-value for Glass + corresponding frame area approx. 1.7 to 2.0 Center of Panel U-value 0.35 => typical curtain wall U-value for Panel + corresponding frame approx 0.7 (all in W/(m2 K)). Here, “Panel” as in “spandrel panel” or the like.   For radiation properties: Find out what coating is to be used for the glass and best use Window5.   Regards, Achim   <div>   </div> <div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'> <div> <div class=MsoNormal align=center style='margin-left:35.4pt;text-align:center'> <hr size=2 width="100%" align=center> </div> From: esp-r-bounces@lists.strath.ac.uk [mailto:esp-r-bounces@lists.strath.ac.uk] On Behalf Of Evan Sterling Sent: Monday, June 09, 2008 7:16 PM To: esp-r@lists.strath.ac.uk Subject: [esp-r] Modelling curtain-wall vs. modelling windows </div>   I am trying to model a building with some curtain-wall sections, but the specifications I have only provide thermal performance data on the glass itself, not the entire unit with aluminum framing, silicone glazing, etc. My one idea is to model the curtainwall with equivalent areas of glass and aluminum, but this doesn't seem terribly accurate. Is there a better option? Thanks, Evan Sterling Mathematics & Engineering Queen's University Kingston, Ontario </div> </div> </body> </html>