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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hello –<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I forwarded this email to colleagues working in LBNL’s Cool Roof
group (Jonathan Slack (<a href="mailto:JLSlack@lbl.gov">JLSlack@lbl.gov</a>)
and Haley Gilbert (<a href="mailto:hegilbert@lbl.gov">hegilbert@lbl.gov</a> )),
and got this response back from them:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>***<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal>“By reducing the emissivity, he's reducing the ability of
the roofing material to emit thermal IR and thereby drop it's temperature.
Hence, the roofing material is increasing in temperature, thus increasing heat
flow into the structure, thus increasing demand on the cooling system. The most
effective cool roofs are both high in reflectivity and high in thermal
emittance. Haley and I have all sort of nice graphics on this if your
collaborator would be interested in seeing them.<br>
<br>
Bottom line for his model - increase reflectance, increase emissivity. Luckily,
all the real world cool roof materials actually do have high emissivities. An
example of a poor cool roof material would be polished copper - even though
it's reflectance is high, it's low emissivity dooms it to poor performance in a
hot climate.”<br>
<br>
<span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>***<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Robin Mitchell<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Windows & Daylighting Group<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Lawrence Berkeley National Laboratory<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>John Aulbach<br>
<b>Sent:</b> Monday, October 11, 2010 12:01 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] "Horses mouth" question.<o:p></o:p></span></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<div>
<p class=MsoNormal>All:<o:p></o:p></p>
</div>
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<p class=MsoNormal><br>
Question on Cool Roof and the way to simulate them in eQuest.<o:p></o:p></p>
</div>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>My boss came to me with a cool roof and asked me to do a
quick eQuest on it. I did a 25,000 sf single story office in Los Angeles, saw
the roof outside emissivity was 0.9. I changed it to 0.5 and the electric
usage went UP. I change it again to 0.12 and the electric usage went up AGAIN.
The HVAC is a standard single zone pacakge unit with furnace heat.<o:p></o:p></p>
</div>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>Am I seeing reality or what am I missing?<o:p></o:p></p>
</div>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>Thanks.<o:p></o:p></p>
</div>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>John
R. Aulbach, PE, CEM</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Senior
Energy Engineer</span><o:p></o:p></p>
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color:#17365D'>
<hr size=2 width="30%" noshade style='color:#17365D' align=left>
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<p class=MsoNormal><b><span style='font-family:"Calibri","sans-serif";
font-variant:small-caps;color:navy'>Partner</span></b><b><span
style='font-family:"Calibri","sans-serif";font-variant:small-caps;color:green'>
</span></b><b><span style='font-family:"Calibri","sans-serif";font-variant:
small-caps;color:#006600'>Energy</span></b><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>1990
E. Grand Avenue, El Segundo, CA 90245<br>
W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745</span><o:p></o:p></p>
<p class=MsoNormal><a href="http://www.ptrenergy.com/" target="_blank"><span
style='font-family:"Calibri","sans-serif";color:purple'>www.ptrenergy.com</span></a><span
style='font-family:"Calibri","sans-serif";color:#1F497D'> </span><a
href="mailto:%7C%20jaulbach@ptrenergy.com" target="_blank"><span
style='font-family:"Calibri","sans-serif"'>| jaulbach@ptrenergy.com</span></a><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'> </span><o:p></o:p></p>
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