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<TITLE>RE: [BLDG-SIM] Cool Roof simulation</TITLE>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial"> </FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">John,</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Did you try changing the absor</FONT><FONT SIZE=2 FACE="Arial">p</FONT><FONT SIZE=2 FACE="Arial">tance? Actually</FONT> <FONT SIZE=2 FACE="Arial">desired</FONT> <FONT SIZE=2 FACE="Arial">emissivity in roof</FONT><FONT SIZE=2 FACE="Arial">s</FONT><FONT SIZE=2 FACE="Arial"> works kind of reverse to windows. A cool roof should have high emissivity numbers (allowing it to radiate heat and not convert that heat to a temperature rise). A common misconception is that energy star roofs are Low-E. Low-E roofs should actually heat up more than a high-E roof.</FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Try changing the</FONT> <FONT SIZE=2 FACE="Arial">absorptance numbers and see if that affects your simulation.</FONT> </SPAN>
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<P><SPAN LANG="en-us"><B><FONT COLOR="#000000" FACE="Garamond">Vikram Sami,</FONT></B> <FONT COLOR="#000000" FACE="Garamond">LEED AP</FONT><B></B></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">-----Original Message-----</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">From: BLDG-SIM@GARD.COM [</FONT></SPAN><A HREF="mailto:BLDG-SIM@GARD.COM"><SPAN LANG="en-us"><U><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">mailto:BLDG-SIM@GARD.COM</FONT></U></SPAN></A><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">] On Behalf Of Aulbach, John</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Sent: Monday, October 16, 2006 4:24 PM</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">To: BLDG-SIM@GARD.COM</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Subject: [BLDG-SIM] Cool Roof simulation</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial"> </FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Hello All:</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">I am looking for a fairly straight forward to model a "Cool Roof" in eQuest.</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">My general understanding would be to do a Parametric Run, changing the outside emissivity from, say 0.75 to 0.3. But I am getting VERY little energy benefit.</FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">My building is a 140,000 sf office, 2-story (70,000 sf roof). It has a CW VAV system with HW reheat, and return air is through ceiling plenums.</FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">I am only seeing about a 50,000 kWh saving out of 11,000,000 kWh HVAC usage.</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Any experience, suggestions?</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">John R. Aulbach, PE, CEM</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Project Manager</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Nexant, Inc.</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">100 North Barranca, Suite 820</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">West Covina, CA 91791 USA</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Phone: 626-430-9054</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Fax: 626-430-9060</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">email: jaulbach@nexant.com</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial"> </FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">==================</FONT></SPAN>
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