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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'>Be careful when entering the outside air CFM via a
percentage of the system because for LEED the outside air must be the same for
the baseline and the proposed model. If the baseline model requires more supply
air than the proposed model the outside airflows will be different between the
two models.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'>Otto <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'>I have also noticed that you have to be careful about how
you specify OA for induction systems. If I enter zone-level OA cfm and also
enter system-level SUPPLY-FLOW, I end up with NO outside air even though the
MIN-OUTSIDE-AIR is set to 1.00. The problem goes away if I enter a system
MIN-AIR-SCH (whether or not I have the SUPPLY-FLOW entered) or if I leave the
SUPPLY-FLOW blank (default).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'>To get a better idea of what the OA is actually doing, I
create an Hourly Report Block and select the following options under the
“HVAC System” variable type:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'>“Ratio of outside air to total supply air” <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'>“Total system supply air flow rate”<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'>There are a ton of other variables available in the hourly
reports that you can use to troubleshoot your models.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color=black face="Franklin Gothic Medium"><span
style='font-size:10.0pt;font-family:"Franklin Gothic Medium";color:black;
font-weight:bold'>William Bishop, EIT, LEED<sup>®</sup> AP </span></font></b><b><font
size=2 color="#006600" face="Franklin Gothic Medium"><span style='font-size:
10.0pt;font-family:"Franklin Gothic Medium";color:#006600;font-weight:bold'>|</span></font></b><b><font
size=2 color=black face="Franklin Gothic Medium"><span style='font-size:10.0pt;
font-family:"Franklin Gothic Medium";color:black;font-weight:bold'> Pathfinder
Engineers & Architects LLP</span></font></b><b><font size=2 color=black
face="Franklin Gothic Medium"><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium";
color:black;font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
9.0pt;color:black'>Mechanical Engineer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
5.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><st1:address w:st="on"><st1:address w:st="on"><st1:Street
w:st="on"><font size=1 color=navy face=Arial><span style='font-size:9.0pt;
color:navy'>134 South Fitzhugh Street</span></font></st1:Street></st1:address><font
size=1 color=navy><span style='font-size:9.0pt;color:navy'><br>
</span></font><st1:place w:st="on"><st1:City w:st="on"><font size=1
color=navy><span style='font-size:9.0pt;color:navy'>Rochester</span></font></st1:City><font
size=1 color=navy><span style='font-size:9.0pt;color:navy'>, <st1:State
w:st="on">NY</st1:State> <st1:PostalCode w:st="on">14608</st1:PostalCode></span></font></st1:place></st1:address><font
size=1 color=navy><span style='font-size:9.0pt;color:navy'><br>
</span></font><font size=1 color=navy><span style='font-size:9.0pt;color:navy'>T:
(585) 325-6004 </span></font><font size=1 color=black><span style='font-size:
9.0pt;color:black'>Ext. 114</span></font><font size=1 color=navy><span
style='font-size:9.0pt;color:navy'><br>
</span></font><font size=1 color=navy><span style='font-size:9.0pt;color:navy'>F:
(585) 325-6005</span></font><font size=1 color=black><span style='font-size:
9.0pt;color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
9.0pt;color:black'>wbishop@pathfinder-ea.com<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
9.0pt;color:black'>www.pathfinder-ea.com</span></font><font size=3 color=navy
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman";
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=5 color=green face=Webdings><span
style='font-size:18.0pt;font-family:Webdings;color:green'>P</span></font><font
color=green><span style='color:green'> </span></font><font size=1 color=green><span
style='font-size:7.5pt;color:green'>Please strive to live sustainably.</span></font><font
color=green><span style='color:green'><o:p></o:p></span></font></p>
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face=Arial><span style='font-size:10.5pt'>
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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'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Verena Kindl<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, September 11, 2009
9:13 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:place w:st="on"><st1:City
w:st="on">Bouchard</st1:City>, <st1:country-region w:st="on">Jordan</st1:country-region></st1:place>;
<st1:PersonName w:st="on">equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users]
outside air ratio</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><o:p> </o:p></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;color:navy'>Thank you, but i already thought about that
and i have nothing specified there. But now I tried to specify the flow to each
zone instead of doing it for the whole system and then the outdoor air ratio is
calculated correctly. Of course I considered the induction ratio so I specified
for each zone 1962 cfm supply flow (induction ratio of 2) then I get an outdoor
air ratio of 1 and 918 cfm OA per zone. Do you think I can do that? It is
strange so as the other way should work as well. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;color:navy'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=2
face=Arial><span lang=DE style='font-size:10.5pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-GB
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>Von:</span></font></b><font
size=2 face=Tahoma><span lang=EN-GB style='font-size:10.0pt;font-family:Tahoma'>
<st1:place w:st="on"><st1:City w:st="on">Bouchard</st1:City>, <st1:country-region
w:st="on">Jordan</st1:country-region></st1:place>
[mailto:Jordan.Bouchard@stantec.c</span></font><font size=2 face=Tahoma><span
lang=DE style='font-size:10.0pt;font-family:Tahoma'>om] <br>
<b><span style='font-weight:bold'>Gesendet:</span></b> Freitag, 11. September
2009 15:08<br>
<b><span style='font-weight:bold'>An:</span></b> Verena Kindl; <st1:PersonName
w:st="on">equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Betreff:</span></b> RE: [Equest-users] outside
air ratio</span></font><span lang=DE><o:p></o:p></span></p>
<p class=MsoNormal><span lang=DE><o:p> </o:p></span></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.5pt;color:black'>Hi Verena,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><o:p> </o:p></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.5pt;color:black'>Check your zone level OA values. If you want to specify
100% OA at the system level you have to clear the zone level inputs as they
will override the system level OA inputs.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.5pt;color:black'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><o:p> </o:p></font></p>
<p class=MsoNormal><b><font size=1 color=black face=Arial><span
style='font-size:9.0pt;color:black;font-weight:bold'>Jordan Bouchard, LEED® AP</span></font></b><font
size=1 color=black><span style='font-size:9.0pt;color:black'><br>
Mechanical Engineer In Training<br>
Stantec Consulting Ltd.<br>
</span></font><font size=1 color=gray><span style='font-size:9.0pt;color:gray'>Ph: (416)
596-6686<br>
Fx: (416) 596-6680<br>
Jordan.Bouchard@stantec.com </span></font><font size=1 color=black><span
style='font-size:9.0pt;color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=4 color=black face="Arial Narrow"><span
style='font-size:13.0pt;font-family:"Arial Narrow";color:black'><a
href="http://www.stantec.com" title="http://www.stantec.com/"><b><font
color="#993333" title="http://www.stantec.com/"><span
title="http://www.stantec.com/"><span style='color:#993333;font-weight:bold'>stantec</span></span></font></b><font
color="#003f6e" title="http://www.stantec.com/"><span
title="http://www.stantec.com/"><span style='color:#003F6E'>.com</span></span></font></a>
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
9.0pt;color:black'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
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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'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Verena Kindl<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, September 11, 2009
8:57 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [Equest-users] outside
air ratio</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><o:p> </o:p></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=DE
style='font-size:10.0pt;color:navy'>Hi all,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=DE
style='font-size:10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;color:navy'>I have an induction unit for the whole
building, supplying 204000 cfm outside air to the building. So I specify the
supply flow of the system (204000 cfm) and set the min outside air ratio =1. In
the SV-A report it shows on the system level 0 outside air and therefore no
cooling/heating capacity and for the zone it shows about 800-1100 cfm outside
air. Only if I do not specify the supply flow on the system level then I also
get an outside air ratio of 1 for the system level. Why is it not possible to
tell equest that the 204000 cfm it supplies is only outside air. I have not
specified an economizer so it should be outside air all the time ??<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;color:navy'>Have a nice weekend.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><o:p> </o:p></font></p>
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