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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Absorptance + transmittance + reflectance =
1<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Since it is an opaque structure,
transmittance = 0 and absorptance = 1 – reflectance = 1 – 0.3 = 0.7<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hope this helps.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>rakeshdesai@ecpl.co.in<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, January 20, 2012
1:06 AM<br>
<b><span style='font-weight:bold'>To:</span></b>
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Equest-users] Roof Reflectance</span></font><font
size=3 face="MS PGothic"><span style='font-size:12.0pt;font-family:"MS PGothic"'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-IN style='font-size:
11.0pt'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-IN style='font-size:
11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-IN style='font-size:
11.0pt'>As per Table G3.1</span>$B!>(B</font><span lang=EN-IN>5(c), the roof surface
should be modelled with a reflectance of 0.45 if the reflectance of the
Proposed roof is greater than 0.7 and its emittance is greater than 0.75.
Otherwise, the Proposed reflectance should be 0.3. The Baseline roof should be
modeled with a reflectivity of 0.3.<o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-IN style='font-size:
11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-IN style='font-size:
11.0pt'>In EQUEST, we can put Ext. Absorptance and not reflectance.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-IN style='font-size:
11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-IN style='font-size:
11.0pt'>What is the relation between reflectance and absorptance and for base
line reflectivity of 0.3, what absorptance value should I put?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-IN style='font-size:
11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=EN-IN style='font-size:
11.0pt'>Rakesh<o:p></o:p></span></font></p>
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