<p>It's true wind does dominate external convection.</p>
<p>Cibse guide A will give you all the numbers that you're looking for </p>
<p>Chris</p>
<div class="gmail_quote">On 11 Feb 2012 22:40, "Paul Hay" <<a href="mailto:phcjam@yahoo.com">phcjam@yahoo.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div style="font-size:12pt;font-family:times new roman,new york,times,serif"><div><span>I've only seen </span>reference values of interior convection coefficients for tilted surfaces, not exterior coefficients: which are available for summer & winter conditions, due to the difference in wind velocity.<br>
</div><div> </div><div>Paul Hay MBA, BA(Arch)<br>Managing Partner<br>PAUL HAY Capital Projects<br><br><span style="font-style:italic">Caribbean Capital Project Management & Planning</span><br><br><img alt=""><br><br>P.O.Box 3367<br>
Constant Springs, Kgn. 8<br>Jamaica, W.I.<br><br></div><div><font><span style="font-size:9.0pt" lang="EN-US">tel: <a href="tel:1%20%28876%29%20756-0631" value="+18767560631" target="_blank">1 (876) 756-0631</a></span></font></div>
<div><font><span style="font-size:9.0pt" lang="EN-US">cel: <a href="tel:1%20%28876%29%20324-4274" value="+18763244274" target="_blank">1 (876) 324-4274</a></span></font></div><div><font><span style="font-size:9.0pt" lang="EN-US">fax: 1 (876)
 756-0631</span></font></div><div><font><span style="font-size:9.0pt" lang="EN-US">  </span></font></div><div><font><span style="font-size:9.0pt" lang="EN-US">e-mail: <a href="mailto:paul.hay@phcjam.com" target="_blank">paul.hay@phcjam.com</a></span></font></div>
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<div><font><span style="font-size:9.0pt" lang="EN-US"><br></span></font></div><div>  <br></div><br><br>  <div style="font-family:times new roman,new york,times,serif;font-size:12pt"> <div style="font-family:times new roman,new york,times,serif;font-size:12pt">
 <div dir="ltr"> <font face="Arial"> ----- Forwarded Message -----<br>  <b><span style="font-weight:bold">From:</span></b> leen peeters <<a href="mailto:l.f.r.peeters@gmail.com" target="_blank">l.f.r.peeters@gmail.com</a>><br>
 <b><span style="font-weight:bold">To:</span></b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a> <br> <b><span style="font-weight:bold">Sent:</span></b> Saturday, February 11, 2012 2:59 PM<br>
 <b><span style="font-weight:bold">Subject:</span></b> [Bldg-sim] exterior convection coefficient for tilted roof<br> </font> </div> <br>
<div><div>Dear,</div>
<div> </div>
<div>can anyone point me to some reference values for exterior convection coefficients for tilted surfaces like a roof?</div>
<div> </div>
<div>Thanks</div>
<div> </div>
<div>Leen</div>
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