<div>Hi Otto, </div><div> </div><div><font face="tahoma,sans-serif">As per 90.1-2007 Addendum W, " Where attributes make a building eligible for more than one <i>baseline </i>system type, use the predominant condition to determine the system type for the entire building except as noted</font><font size="1" face="TimesNewRomanPSMT"><font size="1" face="TimesNewRomanPSMT"><font size="2" face="tahoma,sans-serif">
</font><font size="2" face="tahoma,sans-serif">in Exception a to Section G3.1.1.</font></font></font>" Since your lab < 20,000ft2, my understanding is that you can use system 5. <br clear="all"></div><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>
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<br><br><div class="gmail_quote">On Mon, Oct 3, 2011 at 2:30 PM, Otto Schwieterman <span dir="ltr"><<a href="mailto:oschwieterman@fhai.com" target="_blank">oschwieterman@fhai.com</a>></span> wrote:<br><blockquote style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;" class="gmail_quote">
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<p class="MsoNormal">I am modeling a school that is 150,700 SF. There is a
welding lab in the school and it falls within the exceptions of ASHRAE 90.1
2007: G3.1.1 Exception b. (“Peak thermal loads that differ by 10 btuh/sf
or more from the average of the other spaces served by the system…”).
The welding lab is 3,500 SF and I would use System 3 (PSZ-AC) for this space.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">When I refer to Table G3.1.1A, one of the notes reads “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.”
Does this allow me to use System 5 (Packaged VAV with Reheat) instead of System
7 (VAV with Reheat) since the predominant condition serves 147,200 SF
(150,700-3,500)? <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">This is a LEED project and I would obviously rather use
system 5 than system 7 as my baseline HVAC system.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Otto<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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