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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks Bill,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I think you are right. I will have to use exception “a”
from G3.1.1 in order to use system 5. The academic portion of the building has
a VRF system with the outside air conditioned by hot water from a natural gas
condensing boiler. I am going to separate the spaces that have outside air
(classrooms, offices, corridors……) and spaces that has no direct
outside air (restrooms, technology rooms…..) in the model so I can use
system 5 and 6 if the areas that are conditioned with only electric is over
20,000 SF. This should work because the spaces that have outside are conditioned
with natural gas/electric and many of the other areas are conditioned with only
electric.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Bishop, Bill
[mailto:wbishop@pathfinder-ea.com] <br>
<b>Sent:</b> Tuesday, October 04, 2011 8:41 AM<br>
<b>To:</b> Otto Schwieterman; Cheney<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Bldg-sim] ASHRAE 90.1 2007 Baseline System Selection<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Otto,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>My interpretation is that you determine your baseline system
first “based on usage, number of floors, conditioned floor area and
heating source”, unless G3.1.1 exception a. applies. If, for example,
your school has 20,500 ft<sup>2</sup> of classrooms with electric heating and
the rest of the school is gas, you could justify using both System 5 and System
6, instead of applying System 7 to the whole school. The note to Table G3.1.1A
only mentions exception a., so I don’t think you can subtract areas from
other exceptions to G3.1.1 from the baseline system type determination. If
you’re hoping to use System 5, carefully double-check the conditioned
floor area.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Bill<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=486 height=116 id="Picture_x0020_1"
src="cid:image001.jpg@01CC8272.7E194650" alt="Senior Energy Engineer"><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Otto
Schwieterman<br>
<b>Sent:</b> Tuesday, October 04, 2011 7:34 AM<br>
<b>To:</b> Cheney<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] ASHRAE 90.1 2007 Baseline System Selection<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks Cheney.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Has anyone attempted to do this on a LEED project? Did the
reviewer accept this and were there any comments?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Cheney [mailto:chenyu73@gmail.com]
<br>
<b>Sent:</b> Monday, October 03, 2011 7:59 PM<br>
<b>To:</b> Otto Schwieterman<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] ASHRAE 90.1 2007 Baseline System Selection<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>Hi Otto, <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-family:"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</span><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> in Exception a to
Section G3.1.1.</span>" Since your lab < 20,000ft2, my
understanding is that you can use system 5. <br clear=all>
<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-family:"Comic Sans MS"'>Regards, </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-family:"Comic Sans MS"'>Cheney</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-family:"Comic Sans MS"'>LinkedIN @ </span><a
href="http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b" target="_blank"><span
style='font-family:"Comic Sans MS"'>http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b</span></a><span
style='font-family:"Comic Sans MS"'> </span><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
<div>
<p class=MsoNormal>On Mon, Oct 3, 2011 at 2:30 PM, Otto Schwieterman <<a
href="mailto:oschwieterman@fhai.com" target="_blank">oschwieterman@fhai.com</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>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 style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>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 style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>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 style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks,<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Otto<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
</div>
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