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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;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></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Dan Russell<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, September 04, 2008
4:12 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Eric Youngson;
bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Cc:</span></b>
bldg-rate@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] PSZ-AC</span></font><font
size=3 face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'>Eric, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;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></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;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></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'>Hope that helps.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=4 color="#a0002f" face=Cheltenham><span
style='font-size:14.0pt;font-family:Cheltenham;color:#A0002F'> </span></font><font
size=5 color="#a0002f" face=Cheltenham><span style='font-size:18.0pt;
font-family:Cheltenham;color:#A0002F'>Dan Russell, EIT <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#a0002f" face=Cheltenham><span
style='font-size:10.0pt;font-family:Cheltenham;color:#A0002F'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#a0002f" face=Cheltenham><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@01C90EAA.B1F85180"
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Eric Youngson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, September 04, 2008
3:33 PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Cc:</span></b>
bldg-rate@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-sim] PSZ-AC<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Sim
List,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>
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></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>
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></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Thanks<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p> </o:p></span></font></p>
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