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<p class=MsoNormal><span style='color:#1F497D'>Paul,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'> Thanks
for the heads-up. This is good insight! In fact this is exactly why I am
questioning my interpretation of Appx G. I have only combined common spaces
such as corridors & restrooms, however I believe I should take a closer
look to make sure that these zones have similar exposure on their exterior
surfaces.<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'>Thanks again!<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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Paul Riemer<br>
<b>Sent:</b> Friday, September 05, 2008 8:15 AM<br>
<b>To:</b> 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:blue'>I would be leery about combining zones as the baseline cooling
efficiency, fan power, and economizer should be set by each unit's
tonnage, cfm, and sf respectively. Further it is not your design cfm
& tonnage but rather the baseline autosized cfm & tonnage. </span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Also be sure you know your
software because some programs will allow you to but more
than one zone on a "single zone system" and then model no
control or reheat on the secondary zones, either of which be outside the
intent of Appendix G's system 3.</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<blockquote style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<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 style='margin-bottom:12.0pt'><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>Kendra
Tupper<br>
<b>Sent:</b> Friday, September 05, 2008 9:34 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</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p></o:p></span></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@01C90F40.40684A70"
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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