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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.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></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)? <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></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.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Otto<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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