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<p class=MsoNormal><span style='color:#1F497D'>Kendra,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'> You
are right. The user-guide specifies on page G-27:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>Systems 3 and 4 are <span style='color:red'>single
zone</span><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>packages with either gas or heat pump<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>heating. Whether the baseline building<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>system has an economizer depends on the<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>area served by the system, whether the<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>zone served is a perimeter or an interior<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>zone, and climate. Table G3.1.2.6A gives<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>the floor area served by the system, above<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>which an economizer is needed. For the<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>purposes of defining interior and<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>perimeter zones, any thermal zone that<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>has more than half of its floor area located<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>more than 15 ft from an exterior wall is to<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;
font-family:"Garamond","serif"'>be considered an interior zone, otherwise,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Garamond","serif"'>it
is a perimeter zone.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Garamond","serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Thanks!<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Eric<o:p></o:p></span></p>
<p class=MsoNormal><span style='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"'> Kendra Tupper
[mailto:ktupper@rmi.org] <br>
<b>Sent:</b> Friday, September 05, 2008 7:34 AM<br>
<b>To:</b> Dan Russell; Eric Youngson; bldg-sim@lists.onebuilding.org<br>
<b>Cc:</b> bldg-rate@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Bldg-sim] PSZ-AC<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>I agree with Dan. The 90.1 User’s Manual is a bit more
clear on this subject, and references that a PSZ unit is created for each
thermal zone.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<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>Dan Russell<br>
<b>Sent:</b> Thursday, September 04, 2008 4:12 PM<br>
<b>To:</b> Eric Youngson; bldg-sim@lists.onebuilding.org<br>
<b>Cc:</b> bldg-rate@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] PSZ-AC</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Eric, <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I understand System 3 (PSZ-AC)
to be a standard packaged rooftop that may serve multiple “spaces”,
but only serves a single “thermal zone”. In other words,
there is only one thermostat that controls the entire unit.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Your baseline should have a
separate PSZ-AC for each thermal zone depicted by your HVAC drawings.
Note that adjacent thermal zones with similar load characteristics (light/equip
gain, people count, exterior exposure, etc.) may be lumped into a single
thermal zone for modeling purposes (i.e. less zones = simpler model).<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Hope that helps.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:Cheltenham;
color:#A0002F'> </span><span style='font-size:18.0pt;font-family:Cheltenham;
color:#A0002F'>Dan Russell, EIT <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:Cheltenham;
color:#A0002F'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:Cheltenham;
color:#A0002F'><img width=200 height=174 id="Picture_x005f_x0020_1"
src="cid:image001.jpg@01C90F3F.FBC75230"
alt="cid:image001.jpg@01C840A4.E711B250"></span><span style='color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='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>Eric Youngson<br>
<b>Sent:</b> Thursday, September 04, 2008 3:33 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Cc:</b> bldg-rate@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] PSZ-AC<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Sim List,<o:p></o:p></p>
<p class=MsoNormal>
ASHRAE system 3 is, Packaged Single Zone Air Conditioner (PSZ-AC). The
description of PSZ-AC says, “Packaged rooftop air conditioner”. I
assume that this means a single unit serving multiple zones. This doesn’t
seem to make sense since the name contains the phrase ‘single zone’.<o:p></o:p></p>
<p class=MsoNormal>
I have a building with baseline system 3, PSZ-AC and I’m not sure how to
apply this system. The proposed building has a variety of systems. Should I
have a system per zone or a single unit for the building?<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 style='margin-bottom:12.0pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
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mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><a href="http://www.pae-engineers.com/"><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";text-decoration:
none'><img border=0 width=62 height=62 id="_x0000_i1025"
src="cid:image002.jpg@01C90F3F.FBC75230"
alt="http://www.pae-engineers.com/images/PAElogobug.gif"></span></a><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
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column;mso-height-rule:exactly'><b><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif";color:black'>Eric Youngson </span></b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
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"Verdana","sans-serif";color:black'>503.226.2921 Main<br>
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503.226.2930 Fax<br>
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