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<DIV dir=ltr align=left><SPAN class=907414614-05092008><FONT face=Arial
color=#0000ff size=2>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. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=907414614-05092008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=907414614-05092008><FONT face=Arial
color=#0000ff size=2>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.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=907414614-05092008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV><BR>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> 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<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: "
TimesNewRoman??="">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; 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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: "
TimesNewRoman??=""><o:p></o:p></SPAN></FONT></P></DIV>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d">Eric, <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; 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 face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; 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 face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d">Hope that
helps.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face=Cheltenham color=#a0002f size=4><SPAN
style="FONT-SIZE: 14pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"> </SPAN></FONT><FONT
face=Cheltenham color=#a0002f size=5><SPAN
style="FONT-SIZE: 18pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham">Dan Russell,
EIT <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Cheltenham color=#a0002f size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Cheltenham color=#a0002f size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"><IMG
id=Picture_x005f_x0020_1 height=174 alt=cid:image001.jpg@01C840A4.E711B250
src="cid:907414614@05092008-34AE" width=200></SPAN></FONT><FONT
color=#1f497d><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></FONT></P></DIV>
<P class=MsoNormal><FONT face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; 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></DIV></DIV>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN style="FONT-SIZE: 11pt">Sim
List,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt">
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 face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt">
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 face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt">Thanks<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: "
TimesNewRoman??=""><o:p> </o:p></SPAN></FONT></P>
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size=2><SPAN style="FONT-SIZE: 11pt"><A
href="http://console.mxlogic.com/redir/?bbBT6rTpdFLLLnuusdw0BJYLY2cEvYqsLxKVKVIwuwhbQAGn8lrxrW0E-l9QWIf8dOfgB0zM04SOqen6mjqaqtT4TSnDPqq9I5-Aq83iScDE4iZ9aCBQQg1oo0AK82hKvxYY1NJ4SyrjvvuKYYYrkV-8"><FONT
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