This is the approach i previously took. i got review comments back and wanted to double check to make sure before i resubmitted. <br><br>thanks,<br><br><div class="gmail_quote">On Fri, Nov 12, 2010 at 10:00 AM, Bishop, Bill <span dir="ltr"><<a href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a>></span> wrote:<br>
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<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Rob,</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Generally, I combine all the spaces served
by a single VAV box into one thermal zone for modeling purposes. The ASHRAE
90.1 User’s Manual, p.G-19 has reasonable guidance on defining “thermal
blocks”. Where HVAC zones have been designed, zones can be combined into
thermal blocks for modeling purposes when all these conditions are met
(paraphrasing here):</span></font></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"><span>1.)<font face="Times New Roman" size="1"><span style="font: 7pt "Times New Roman";"> </span></font></span></span></font><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">The spaces have the same load and schedule characteristics.</span></font></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"><span>2.)<font face="Times New Roman" size="1"><span style="font: 7pt "Times New Roman";"> </span></font></span></span></font><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Exterior zones with glazing must have the <span>same,</span>
or similar orientation.</span></font></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"><span>3.)<font face="Times New Roman" size="1"><span style="font: 7pt "Times New Roman";"> </span></font></span></span></font><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Zones must be served by the same HVAC system or by the same kind of
HVAC system.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Chances are that the zones/spaces served
by a single VAV box will meet these criteria in a properly designed HVAC
system.</span></font></p>
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<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Regards,</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Bill</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
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<p class="MsoNormal"><b><font color="black" face="Franklin Gothic Medium Cond" size="2"><span style="font-size: 10pt; font-family: "Franklin Gothic Medium Cond"; color: black; font-weight: bold;">William</span></font></b><b><font color="black" face="Franklin Gothic Medium Cond" size="2"><span style="font-size: 10pt; font-family: "Franklin Gothic Medium Cond"; color: black; font-weight: bold;"> Bishop, PE</span></font></b><b><font color="black" face="Franklin Gothic Medium Cond" size="2"><span style="font-size: 10pt; font-family: "Franklin Gothic Medium Cond"; color: black; font-weight: bold;">, BEMP, LEED<sup>®</sup>
AP </span></font></b><b><font color="#006600" face="Franklin Gothic Medium Cond" size="2"><span style="font-size: 10pt; font-family: "Franklin Gothic Medium Cond"; color: rgb(0, 102, 0); font-weight: bold;">|</span></font></b><b><font color="black" face="Franklin Gothic Medium Cond" size="2"><span style="font-size: 10pt; font-family: "Franklin Gothic Medium Cond"; color: black; font-weight: bold;"> </span></font></b><b><font color="black" face="Franklin Gothic Medium Cond" size="2"><span style="font-size: 10pt; font-family: "Franklin Gothic Medium Cond"; color: black; font-weight: bold;">Pathfinder
Engineers & Architects LLP</span></font></b><b><font color="black" face="Franklin Gothic Medium Cond" size="2"><span style="font-size: 10pt; font-family: "Franklin Gothic Medium Cond"; color: black; font-weight: bold;"></span></font></b></p>
<p class="MsoNormal"><font color="black" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: black;">Mechanical Engineer</span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="1"><span style="font-size: 5pt; font-family: Arial; color: black;"> </span></font></p>
<p class="MsoNormal"><span style="margin-left: 367px; margin-top: 17px; width: 60px; min-height: 58px;"><img src="cid:image001.jpg@01CB8250.14D26B40" width="60" height="58"></span><font color="navy" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: navy;">134 South Fitzhugh Street</span></font><font color="navy" size="1"><span style="font-size: 9pt; color: navy;"><span> </span></span></font><font color="navy" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: navy;">Rochester</span></font><font color="navy" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: navy;">, NY 14608</span></font><font color="navy" size="1"><span style="font-size: 9pt; color: navy;"><br>
</span></font><font color="navy" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: navy;">T: (585) 325-6004 </span></font><font color="black" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: black;">Ext. 114</span></font><font color="navy"><span style="color: navy;"><span> </span></span></font><font color="navy" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: navy;">F: (585) 325-6005</span></font><font color="black" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: black;"></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: black;"><a href="mailto:wbishop@pathfinder-ea.com" target="_blank">wbishop@pathfinder-ea.com</a><span> </span></span></font><font color="black" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: black;"><a href="http://www.pathfinder-ea.com/" target="_blank">www.pathfinder-ea.com</a></span></font></p>
<p class="MsoNormal"><font color="green" face="Webdings" size="5"><span style="font-size: 18pt; font-family: Webdings; color: green;">P</span></font><font color="green"><span style="color: green;"><span> </span></span></font><font color="green" size="1"><span style="font-size: 7.5pt; color: green;">Sustainability
– the forest AND the trees.</span></font><font color="green" face="Webdings" size="5"><span style="font-size: 18pt; font-family: Webdings; color: green;"> P<span> </span></span></font><font color="green"><span style="color: green;"></span></font></p>
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<p class="MsoNormal"><b><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma;">
<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>] <b><span style="font-weight: bold;">On Behalf Of </span></b>Rob Hudson<br>
<b><span style="font-weight: bold;">Sent:</span></b> Friday, November 12, 2010
9:22 AM<br>
<b><span style="font-weight: bold;">To:</span></b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> [Bldg-sim] Thermal Zones</span></font></p>
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<p class="MsoNormal"><font face="Times New Roman" size="3"><span style="font-size: 12pt;">Hypothetically speaking, if i have a proposed design of a packaged VAV
system where each VAV serves a range from 1 to 3 rooms, does my baseline design
make the rooms serves by each VAV box a thermal zone or is each and every room
its own thermal zone?<br>
<br>
So if i have 10 VAV boxes each serving 3 rooms, is it 10 thermal zones or 30
thermal zones?<br clear="all">
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-- <br>
Rob Hudson</span></font></p>
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</blockquote></div><br><br clear="all"><br>-- <br>Rob Hudson<br>