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</o:shapelayout></xml><![endif]--></head><body lang=DE-CH link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Dear Dimitrios<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>you can set both internal and external values via the "convection coefficients". A file (.htc) is generated with the general form of<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-US>HC_CTL for zone box2<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-US>*Date,Wed Jun 11 11:22:28 2008<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-US> 1 # number control intervals<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-US> 6 # number of surfaces<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-US># (<span style='color:blue'>front</span> Wall-2 Wall-4 Top-5 Base-6 back)<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-US> 0.00 24.00 # start and end time of interval<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-US> 1 # fixed coef. calculation control type<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-US>*Doc,User supplied hc values<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-US> <span style='color:blue'>90.000</span>,-1.0000,-1.0000,-1.0000,-1.0000,-1.0000 </span><span lang=EN-US style='font-family:"Arial","sans-serif";color:red'>values internal (-1.0=default algorithm, i.e. Alamdari-Hammond)</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-US> <span style='color:blue'>90.000</span>,-1.0000,-1.0000,-1.0000,-1.0000,-1.0000 </span><span lang=EN-US style='font-family:"Arial","sans-serif";color:red'>values external</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>In above example (if I remember correctly), surface one of the zone gets fixed values inside and out of 90 W/(m2 K). <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Best<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Achim<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=DE style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:DE-CH'>Von:</span></b><span lang=DE style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:DE-CH'> esp-r-bounces@lists.strath.ac.uk [mailto:esp-r-bounces@lists.strath.ac.uk] <b>Im Auftrag von </b>Dimitrios Sfakianakis<br><b>Gesendet:</b> Montag, 9. Januar 2012 20:28<br><b>An:</b> 'esp-r@lists.strath.ac.uk'<br><b>Betreff:</b> [esp-r] External convection coefficient<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB>Dear all,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Wishing you all a happy new year!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>I am trying to model a surface that is in contact with water. As far as I know, the main heat transfer mechanism in this case is convection (forced or natural depending on the state of the water) and the heat exchange between water and the surface depends on the area of the surface, the temperature difference and the convection coefficient (I know that the calculation of the coefficient is tricky and depends on many variables). My question is, is there an in-built facility that allows the user to change the convection coefficient for an external surface? From what I have seen so far, the user can alter the internal convection coefficient of a surface from “Zone composition -> Convection coefficients”. I know that superimposing a new convection coefficient won’t solve my problem, however I believe it is a good place to start.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:EN-GB'>Kind regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:EN-GB'>-<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:EN-GB'>Dimitrios Sfakianakis<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p></div></div></body></html>