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<DIV dir=ltr align=left><SPAN class=446233314-26052010><FONT color=#0000ff
size=2 face=Arial>If you are entering the min. OSA intake through the air
handler or system level then you need to zero out the OSA items in the zone
level to get the system OSA control to work, the only exception to this is
if you are doing something with demand control ventilation. This will
bring in the min. OSA through the air handler whenever the the air handler fan
is on, unless you set up a schedule to vary the min. % amount of outside
air that is to be brought in through the air handler at different times.
Anything that you set up for OSA at the zone level will override what you put in
through the system. The eQUEST program is set up to automatically do this
override If your air handler was set up to cycle off at night when
unoccupied or you had some schedule to vary the outside air intake through the
air handler, then the amount of OSA with the system method would be reduced
at times. While, unless you set up some schedule, the zone level OSA
method would continue to bring in OSA, thus increasing the heating gas
consumption. While there are many factors on a program this complex
that could be causing this gas increase to happen, I would guess that it is this
or something related to this, as I have experienced this in the
past.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=446233314-26052010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=446233314-26052010>
<DIV align=left>
<DIV align=left><STRONG><EM><FONT color=#0000ff size=6
face="Bradley Hand ITC">David A. Bastow </FONT></EM></STRONG></DIV>
<DIV align=left><STRONG><EM><FONT face="Rockwell Extra Bold">McClure
Engineering, Inc. </FONT></EM></STRONG></DIV></DIV></SPAN></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of
</B>Tomlinson, Scott<BR><B>Sent:</B> Wednesday, May 26, 2010 7:35
AM<BR><B>To:</B> equest-users@lists.onebuilding.org<BR><B>Subject:</B>
[Equest-users] eQuest - outside air heating issues<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal>Hello all,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I have a question regarding outside air input. For my
design building I enter my outside air at the system level, as the minimum
outside air ratio, which I get from my equipment schedules. 90.1 requires
that the outside airflow be the same. To do this I take my summary report
from my design building and enter the values from that report into the baseline
model zones. When I run my baseline model the outside airflow rates from
the summary report match those of my design model, and my unmet heating hours
are good in both models, but the heating gas consumption in my baseline building
triples. The result is I am getting great, but unrealistic, energy
savings.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Does anyone know why this is happening? Why would
entering the OA at the zone level cause such increased heating for the save
total CFM entered at the system level? How are you folks typically
handling your outside ventilation air.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Any help would be greatly appreciated, thank
you.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
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<P class=MsoNormal><B><SPAN
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PE, LEED-AP</SPAN></B><SPAN
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<P class=MsoNormal><B><SPAN
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Maini & McKee Associates, Inc.</SPAN></B><SPAN
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Massachusetts Avenue, Cambridge, MA 02138</SPAN><SPAN
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