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<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>
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<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>
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src="cid:image001.jpg@01C90EA8.D9316F40"
alt="cid:image001.jpg@01C840A4.E711B250"></span><span style='color:#1F497D'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<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>
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<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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