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<TITLE>Re: [Bldg-sim] Baseline Modeling for LEED</TITLE>
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<FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Under current LEED EAc1/ASHRAE 90.1: Use the same ventilation rate in both base and design cases, with a few limited exceptions (read the CIRs about lab air change rates, etc.)<BR>
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This will likely evolve for LEED 2012.<BR>
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Chris Schaffner, PE<BR>
Vice-Chair EA TAG <BR>
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On 11/19/09 5:19 PM, "Vikram Sami" <<a href="VSami@lasarchitect.com">VSami@lasarchitect.com</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><SPAN STYLE='font-size:11pt'><FONT COLOR="#0000B4"><FONT FACE="Calibri, Verdana, Helvetica, Arial">I always assumed that if you went to 30% extra, you kept the baseline at 100%, and the designed building at 130%, but after reading this, it does seem to make sense that you would increase both occurrences. <BR>
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Can anyone from the EA Tag chime in?<BR>
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</FONT></SPAN><FONT FACE="Garamond"><SPAN STYLE='font-size:12pt'><B>Vikram Sami,</B></SPAN></FONT><SPAN STYLE='font-size:12pt'><FONT COLOR="#0000B4"><FONT FACE="Times New Roman"> </FONT></FONT><FONT FACE="Garamond">LEED AP</FONT><FONT COLOR="#0000B4"><FONT FACE="Times New Roman"> <BR>
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</FONT></SPAN><FONT SIZE="2"><FONT FACE="Tahoma, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:10pt'><B>From:</B> <a href="bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a> [<a href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a>] <B>On Behalf Of </B>Nathan Miller<BR>
<B>Sent:</B> Thursday, November 19, 2009 4:42 PM<BR>
<B>To:</B> 'Rimes, Christie'; 'Steven Rutter'; <a href="bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><BR>
<B>Subject:</B> Re: [Bldg-sim] Baseline Modeling for LEED<BR>
</SPAN></FONT></FONT><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'> <BR>
<FONT COLOR="#1F497D">I disagree, I believe the models should be same-same on ventilation rates. See section 90.1 (2004) Section G3.1.2.5. It states:<BR>
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“Minimum outdoor air ventilation rates should be the same for the proposed and baseline building designs.”<BR>
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In my projects (including those that include 30% additional outside air), I have always used the same outdoor air flow rates, unless I was taking credit for demand control ventilation in the proposed case (see the exception allowed in that same ASHRAE section). <BR>
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</FONT></SPAN></FONT><SPAN STYLE='font-size:11pt'><FONT FACE="Verdana, Helvetica, Arial"><BR>
</FONT></SPAN><FONT FACE="Verdana, Helvetica, Arial"><FONT COLOR="#1F497D"><SPAN STYLE='font-size:12pt'>Nathan Miller<BR>
</SPAN></FONT></FONT><FONT COLOR="#1F497D"><FONT SIZE="2"><FONT FACE="Times New Roman"><SPAN STYLE='font-size:10pt'><I>Senior Energy Engineer/Mechanical Engineer<BR>
</I>direct: 206.788.4577<BR>
fax: 206.285.7111 <BR>
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</FONT></SPAN><FONT SIZE="2"><FONT FACE="Tahoma, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:10pt'><B>From:</B> <a href="bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a> [<a href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a>] <B>On Behalf Of </B>Rimes, Christie<BR>
<B>Sent:</B> Thursday, November 19, 2009 1:32 PM<BR>
<B>To:</B> Steven Rutter; <a href="bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><BR>
<B>Subject:</B> Re: [Bldg-sim] Baseline Modeling for LEED<BR>
</SPAN></FONT></FONT><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'> <BR>
<FONT COLOR="#1F497D">In my experience you do not increase the baseline energy model as you are being awarded (gaining that point) when you achieve the ventilation credit. There are a few similar situations in LEED where by achieving one credit will prevent you from achieving another but this happens to everyone so it works out to be somewhat fair. <BR>
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</FONT><FONT COLOR="#1F497D"><FONT FACE="Calibri, Verdana, Helvetica, Arial"><IMG src="cid:3341561507_2922116" ><BR>
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</FONT></SPAN><FONT SIZE="2"><FONT FACE="Tahoma, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:10pt'><B>From:</B> <a href="bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a> [<a href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a>] <B>On Behalf Of </B>Steven Rutter<BR>
<B>Sent:</B> Thursday, November 19, 2009 1:25 PM<BR>
<B>To:</B> <a href="bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><BR>
<B>Subject:</B> [Bldg-sim] Baseline Modeling for LEED<BR>
</SPAN></FONT></FONT><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'> <BR>
All,<BR>
There is a credit in LEED (EQc2.0) that involves increasing the required ventilation rate by 30%. In trying to achieve this credit, the amount of energy would have to increase to condition that additional 30% OSA. Does anyone know if you are supposed to increase the baseline energy model’s ventilation rate so it has the same ventilation rate as the proposed building? Thank you in advance for your help.<BR>
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</SPAN></FONT><SPAN STYLE='font-size:11pt'><FONT COLOR="#808080"><FONT FACE="Tahoma, Verdana, Helvetica, Arial"><B>Steven Rutter, LEED</B></FONT></FONT></SPAN><FONT COLOR="#808080"><FONT FACE="Tahoma, Verdana, Helvetica, Arial"><B><FONT SIZE="1"><SPAN STYLE='font-size:9pt'>®</SPAN></FONT><SPAN STYLE='font-size:11pt'> AP, EIT<BR>
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