<div>Hi zhiren, </div>
<div> </div>
<div>Please note ASHRAE has published addendum for your option 1. According to Addendum W to 90.1-2007: <br></div>
<div>" <font face="TimesNewRomanPSMT"><font face="TimesNewRomanPSMT">Where attributes make a building eligible for more than one </font></font><i><font face="TimesNewRomanPS-ItalicMT"><font face="TimesNewRomanPS-ItalicMT">baseline </font></font></i><font face="TimesNewRomanPSMT"><font face="TimesNewRomanPSMT">system type, use the predominant condition to determine the system type for the entire building except as noted in Exception a to Section G3.1.1." </font></font></div>
<div> </div>
<div>So there is no conflict between the two options. </div>
<div> </div>
<div>-- <br>
<div><font face="comic sans ms,sans-serif">Regards, </font></div>
<div><font face="comic sans ms,sans-serif"></font> </div>
<div><font face="comic sans ms,sans-serif">Cheney</font></div>
<div><font face="comic sans ms,sans-serif"></font> </div>
<div><font face="comic sans ms,sans-serif">LinkedIN @ </font><a href="http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b" target="_blank"><font face="comic sans ms,sans-serif">http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b</font></a><font face="comic sans ms,sans-serif"> </font></div>
<br><br></div>
<div class="gmail_quote">On Tue, Dec 14, 2010 at 6:19 PM, zhiren zhou <span dir="ltr"><<a href="mailto:zhouzr@cabr-sh.com">zhouzr@cabr-sh.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span lang="EN-US">Dear all:</span></p>
<p class="MsoNormal"><span lang="EN-US"> My project is a 84- floor super-high building with 27 floors for office and 47 floors for residential(hotel and apartment) and others for retail and equipment floors. When I select baseline HVAC system I’m confused as both the two option below sounds rational:</span></p>
<p style="MARGIN-LEFT: 39pt"><span lang="EN-US"><span>1)<span style="FONT: 7pt 'Times New Roman'"> </span></span></span><span lang="EN-US">The Note under TABLE G3.1.1A- Baseline HVAC System Types in Page 181 of ASHRAE 90.1 tells that : “Where attributes make a building eligible for more than one baseline system type, use the predominant condition to determine the system type for the entire building.”</span></p>
<p style="MARGIN-LEFT: 39pt"><span lang="EN-US"><span>2)<span style="FONT: 7pt 'Times New Roman'"> </span></span></span><span lang="EN-US">The explanation in Page G-23 of ASHRAE 90.1 MANUAL tells that : “If a building has both residential and nonresidential spaces with their total conditioned floor area both greater than 20,000 ft², for instance a residential tower with retail and restaurants at the base, then the HVAC system type is determined separately for the residential and nonresidential portions.”</span></p>
<p style="MARGIN-LEFT: 21pt" class="MsoNormal"><span lang="EN-US">So if I follow option 1 I should select PTAC for the whole building which I think unsuitable. else if I follow option 2 I should select PTAC for residential and VAV for office and others. </span></p>
<p style="MARGIN-LEFT: 21pt" class="MsoNormal"><span lang="EN-US">Which option should I follow?</span></p>
<p style="MARGIN-LEFT: 21pt" class="MsoNormal"><span lang="EN-US">Could anyone tell me? Thanks</span></p>
<p style="MARGIN-LEFT: 21pt" class="MsoNormal"><span lang="EN-US"> </span></p><font color="#888888">
<p style="MARGIN-LEFT: 21pt" class="MsoNormal"><span lang="EN-US"> Zhiren ZHOU</span></p>
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