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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>John and Sambhav,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You are absolutely correct. If you specify exhaust CFM that
exceeds OSA cfm, the OSA cfm is indeed increased to prevent negative
pressurization of the zone. This is true if the Exhaust Air Source is specified
as "Air Handler" (see screenshot). The other options are
"Infiltration" and "Balanced Infiltration". If either of
these latter two options are selected, the OSA cfm is not increased, but the
exhaust air is made up through outside air infiltration into the zone (note:
this is different than zonal infiltration, or space-to-space air transfer). I
personally have been unsuccessful using either the "Infiltration", or
"Balanced Infiltration" options because my unmet load hours tend to
skyrocket when either option is selected. Again, my interpretation is that
eQuest is making up the exhaust air with unconditioned outside air, which then dramatically
impacts the temperature of the space. If anyone has had any success using these
other methods, or some work-around to simulate space-to-space air transfer, I
would be very interested in hearing about it. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>As John has already stated, with any of the three options, eQuest
will account for fan power based on your input KW/cfm or a combination of Static
Pressure and Efficiency.<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>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;color:navy'>Seun
Odukomaiya, LEED AP - </span></b><i><span style='font-size:10.0pt;
color:navy'>Mechanical Engineer</span></i><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'>L’Acquis
Consulting Engineers</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:navy'>9229 Delegates Row,
Suite 550</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:3.0pt'><span style='font-size:9.0pt;
color:navy'>Indianapolis, IN 46240<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:navy'>voice: (317)
706-2075 Ext. 255<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:navy'>fax:
(317) 706-2076<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:navy'>email: <a
href="mailto:sodukomaiya@laceindy.com"><span style='color:blue'>sodukomaiya@laceindy.com</span></a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:navy'>web: <a
href="http://www.laceindy.com/"><span style='color:blue'>www.laceindy.com</span></a><o:p></o:p></span></p>
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style='font-size:18.0pt;font-family:Webdings;color:green'>P</span><b><span
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color:#1F497D'><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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>John
Aulbach<br>
<b>Sent:</b> Thursday, April 01, 2010 3:00 AM<br>
<b>To:</b> sambhav tiwari; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Air side HVAC<o:p></o:p></span></p>
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<p class=MsoNormal>Sambhav:<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>If you want Exhaust CFM Fan energy, then I believe you
need to specify Exhaust CFM.<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>OK, eQuesters, I think I have this straight. If you
specify an Exhaust CFM LESS THAN OSA CFM, nothing airwise changes, and Exhaust
CFM translates to an Exhaust fan HP. If Exaust CFM EXCEEDS OSA CFM, the
OSA CFM is increased to account for no negative airflow. And Exhaust CFM STILL
creates and Exhaust HP.<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>Comments from our studio audience, please..<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<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"'> sambhav tiwari
<tiwari.sambhav@gmail.com><br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Sent:</b> Wed, March 31, 2010 10:47:32 PM<br>
<b>Subject:</b> [Equest-users] Air side HVAC<br>
</span><br>
Hi All,<br>
In the AIR side HVAC under zone when we go to outdoor air tab there it asks
about exhaust fan cfm for each zone so do we have to specify it exhaust cfm
zonewise or the program assumes it that what ever is the fresh air cfm for each
conditioned zone same will be the exhaust cfm.<br>
<br>
Any response will be appreciable.<br>
<br>
Thanks<br>
Sambhav Tiwari.<o:p></o:p></p>
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