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<TITLE>RE: [Bldg-sim] LEED modeling requirements for existing buildings</TITLE>
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<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Mark,</FONT><FONT FACE="Times New Roman"> </FONT>
<BR><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Under ASHRAE 90.1 Appendix G, Table G3.1, Section 5, "Baseline Building Performance" column, requirement (f) (take a breath…) it states that "For existing building envelopes, the baseline building design shall reflect existing conditions prior to any revisions that are part of the scope of work being evaluated". So the rotation doesn't apply to you. Also, I interpret that to mean the windows don't need to be redistributed either. Hope that helps!</FONT></P>
<P><B><I><FONT COLOR="#000080" FACE="Garamond">Eric O'Neill</FONT></I></B>
<BR><FONT COLOR="#808080" SIZE=2 FACE="Garamond">Mechanical Engineer</FONT>
<BR><FONT COLOR="#808080" SIZE=2 FACE="Garamond">Energy Division - Michaels Engineering</FONT>
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<P><FONT COLOR="#808080" SIZE=1 FACE="Arial">811 Monitor St. Ste 100</FONT>
<BR><FONT COLOR="#808080" SIZE=1 FACE="Arial">La Crosse, WI 54603</FONT>
<BR><FONT COLOR="#808080" SIZE=1 FACE="Arial">v: 608-785-1900 x521</FONT>
<BR><FONT COLOR="#808080" SIZE=1 FACE="Arial">f: 608-784-2270</FONT>
<BR><FONT COLOR="#808080" SIZE=1 FACE="Arial">elo@michaelsengineering.com</FONT>
<BR><A HREF="http://www.michaelsengineering.com"><U></U><U><FONT COLOR="#0000FF" SIZE=1 FACE="Arial">http://www.michaelsengineering.com</FONT></U></A>
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<P><B><FONT SIZE=2 FACE="Tahoma">From:</FONT></B><FONT SIZE=2 FACE="Tahoma"> Mark Sorensen [</FONT><A HREF="mailto:DEnergyServices@comcast.net"><U><FONT COLOR="#0000FF" SIZE=2 FACE="Tahoma">mailto:DEnergyServices@comcast.net</FONT></U></A><FONT SIZE=2 FACE="Tahoma">]<BR>
</FONT><B><FONT SIZE=2 FACE="Tahoma">Sent:</FONT></B><FONT SIZE=2 FACE="Tahoma"> Thursday, August 14, 2008 10:40 AM<BR>
</FONT><B><FONT SIZE=2 FACE="Tahoma">To:</FONT></B><FONT SIZE=2 FACE="Tahoma"> bldg-sim@lists.onebuilding.org<BR>
</FONT><B><FONT SIZE=2 FACE="Tahoma">Subject:</FONT></B><FONT SIZE=2 FACE="Tahoma"> [Bldg-sim] LEED modeling requirements for existing buildings<BR>
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<BR><FONT SIZE=2 FACE="Arial">When modeling an existing building, is required to calculate the proposed building window to wall ratio and equally redistribute the glass area to the baseline building and prepare models for the four rotation exposures? My take is that for a proposed existing building, there is not an opportunity to position the building to the most advantageous exposure and you could end up being penalized if the baseline energy use is averaged for all rotations but I have not been able to find any reference in LEED or ASHRAE to support this. I’m not sure what to think about equal redistribution of the glass areas.</FONT> </P>
<P><FONT FACE="Times New Roman">Mark Sorensen</FONT>
<BR><FONT FACE="Times New Roman">Diversified Energy Services</FONT>
<BR><FONT FACE="Times New Roman">5890 E. Pontaluna Rd.</FONT>
<BR><FONT FACE="Times New Roman">Fruitport, MI 49415</FONT>
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