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<p class=MsoNormal><font size=2 color=navy face="Arial Narrow"><span
lang=EN-CA style='font-size:10.0pt;font-family:"Arial Narrow";color:navy'>Liam,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face="Arial Narrow"><span
lang=EN-CA style='font-size:10.0pt;font-family:"Arial Narrow";color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face="Arial Narrow"><span
lang=EN-CA style='font-size:10.0pt;font-family:"Arial Narrow";color:navy'>The
radiation exchanges between surfaces separated by an air gap within a
construction are not explicitly modelled / simulated in ESP-r - rather the effective
thermal resistance of the air gap in the zone's construction file (.con) can be
adjusted to account for various gases and low-e coatings in a sealed glass unit.
Using WIS or LBNL's WINDOW, you can derive the effective gap resistance for a
given window from the entire unit U value, and individual glass pane thicknesses
and conductivities. You should also tweak values to account for framing effects
(both in .con and .tmc files).</span></font></p>
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lang=EN-CA style='font-size:10.0pt;font-family:"Arial Narrow";color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face="Arial Narrow"><span
lang=EN-CA style='font-size:10.0pt;font-family:"Arial Narrow";color:navy'>Hope
this helps,</span></font></p>
<p class=MsoNormal><font size=2 color=gray face="Arial Narrow"><span
style='font-size:10.0pt;font-family:"Arial Narrow";color:gray'>Denis Bourgeois</span></font></p>
<p class=MsoNormal><font size=2 color=navy face="Arial Narrow"><span
style='font-size:10.0pt;font-family:"Arial Narrow";color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Message d'origine-----<br>
<b><span style='font-weight:bold'>De :</span></b>
esp-r-bounces@lists.strath.ac.uk [mailto:esp-r-bounces@lists.strath.ac.uk] <b><span
style='font-weight:bold'>De la part de</span></b> Liam O'Brien<br>
<b><span style='font-weight:bold'>Envoyé :</span></b> March 12, 2008 5:51
PM<br>
<b><span style='font-weight:bold'>À :</span></b> esp-r@lists.strath.ac.uk<br>
<b><span style='font-weight:bold'>Objet :</span></b> [esp-r] Low-e
coatings</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:12.0pt;margin-left:
35.4pt'><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:
Tahoma'>Hello,<br>
<br>
I want to model a low-e coating on a new window construction. As far as I
can tell, materials (i.e. glass) are defined as homogeneous in the materials
library, and thus have a single emissivity value. However, clearly a
low-e coating will cause the glass to have two different emissivity
values. Could anyone share how they have modeled this?<br>
<br>
Also, it would be useful in future versions of ESP-r to have fill gases other
than air. I know the properties of the air can be changed, but it would
save a step to be able to choose argon or krypton, for example.<br>
<br>
Thanks!<br>
<br>
Liam O'Brien</span></font></p>
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