<html> <head> <meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <meta name=Generator content="Microsoft Word 11 (filtered)"> <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> 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='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </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>