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<title>OA ratio stuck at 1</title>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Patrick,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><br>
The return fan for each system has only been half defined, so eQUEST is punishing
you by running at 100% OA. All systems have either 0.9 or 1.0 degree specified
for the return fan temperature rise with no corresponding kW/CFM. If you have
return fans, enter the corresponding kW/CFM. If not, “restore default” on the return
fan rise. Either one should put the needle back on the record. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>On a related note, a temperature rise has been specified for the
supply fans, too, but the corresponding power was left at the default. This is
not causing the OA problem since both power and rise have been provided, but it
would be worthwhile to specify the supply power and let the rise default, or
simply restore default on the supply rise, too. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks,<o:p></o:p></span></p>
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<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"'> Patrick O'Donnell
[mailto:pco@MichaelsEngineering.com] <br>
<b>Sent:</b> Friday, February 26, 2010 4:53 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] OA ratio stuck at 1<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p><span style='font-family:"Calibri","sans-serif"'>Hi all,</span><o:p></o:p></p>
<p><span style='font-family:"Calibri","sans-serif"'>I have modeled a simple PSZ
with one</span> <span style='font-family:"Calibri","sans-serif"'>system per
zone. Problem is that my OA damper is</span> <span style='font-family:
"Calibri","sans-serif"'>“stuck” open (just like the real world hehe or closed
sometimes!). i.e. no matter what I do I cannot bring in less than 100%</span> <span
style='font-family:"Calibri","sans-serif"'>OA at the system level. My</span>
<span style='font-family:"Calibri","sans-serif"'>“Outside Air Ratio” is shown
as 1 in the detailed report for each zone and I don’t know why and I cannot
change it.</span><o:p></o:p></p>
<p><span style='font-family:"Calibri","sans-serif"'>I have tried messing with
OA ratio, restoring the defaults,</span> <span style='font-family:"Calibri","sans-serif"'>eliminating</span>
<span style='font-family:"Calibri","sans-serif"'>the economizer all together,
setting OA to zero at system and zone level but nothing seems to change the
Outside Air Ratio of 1 or the</span> <span style='font-family:"Calibri","sans-serif"'>hourly
reports</span> <span style='font-family:"Calibri","sans-serif"'>showing 100%
OA.</span><o:p></o:p></p>
<p><span style='font-family:"Calibri","sans-serif"'>With this scenario, one
system per zone,</span> <span style='font-family:"Calibri","sans-serif"'>my
system and zone level are essentially the same. </span> <span
style='font-family:"Calibri","sans-serif"'>I can adjust my zone-level OA</span>
<span style='font-family:"Calibri","sans-serif"'>down but for example the
hourly reports show</span> <span style='font-family:"Calibri","sans-serif"'>SA
CFM at 1500 and Ratio of OA to SA is .9999 for a particular zone and that
zone’s</span> <span style='font-family:"Calibri","sans-serif"'>SA is 1500 CFM
which</span> <span style='font-family:"Calibri","sans-serif"'>has be all OA
then, right?</span><o:p></o:p></p>
<p><span style='font-family:"Calibri","sans-serif"'>Has anyone encountered this
issue??</span> <span style='font-family:"Calibri","sans-serif"'>I have attached
.pd2 and input file for viewing. If anyone can tell me how I can turn off
100% OA I would be glad to know. </span> <span style='font-family:
"Calibri","sans-serif"'>Any other assistance or ideas are appreciated.
Thanks,</span> <o:p></o:p></p>
<p><span style='font-family:"Calibri","sans-serif"'>-Patrick</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><<Base1.inp>>
<<Base1.pd2>> </span><o:p></o:p></p>
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