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<DIV><SPAN class=116121418-30082004><FONT face=Arial size=2>Below I have
inserted part of the eQuest help screen for the minimum OA
schedule:</FONT></SPAN></DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff
size=2>Minimum Outside Air Schedule</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff
size=2>Specifies the ratio of minimum outside air flow to Supply Air Flow for
each hour.</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff size=2>If the
value in the schedule is a fraction, <STRONG>this specifies the minimum outside
air damper position as a ratio of the design supply air flow rate</STRONG>. In
addition, this enables the economizer. </FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff size=2>Since
the OA damper position is based on the system design flow, this definition
explains why a schedule specifying 1.00 24/7 converts the VAV to a constant
volume system. I don't know if this would work but if I was you, I would
first try to set the min OA ratio at 1.00 with the min OA method at "Fraction of
Hourly Flow" and eliminate the OA schedule altogether. Please let me know
what you find.</FONT></SPAN></DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff size=2>Thanks
and Good Luck,</FONT></SPAN></DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff size=2>Sheila
Sagerer</FONT></SPAN></DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff size=2>Energy
Engineer, LEED AP</FONT></SPAN></DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff size=2>Energy
Opportunities, Inc</FONT></SPAN></DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff size=2>Phone:
717-880-9069</FONT></SPAN></DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff size=2>Fax:
717-291-9497</FONT></SPAN></DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=116121418-30082004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> postman@gard.com
[mailto:postman@gard.com]<B>On Behalf Of </B>Joe Hager<BR><B>Sent:</B> Monday,
August 30, 2004 12:16 PM<BR><B>To:</B> BLDG-SIM@gard.com<BR><B>Subject:</B>
[BLDG-SIM] Modeling 100% OA VAV systems in eQuest<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>I recently encountered this same issue. I
found out if I switched the system type to a Powered Induction Unit that
the model would have variable flow. Another place to look at is your
thermostat type, some systems default to either proportional or reverse
action which effects how VAV boxes respond to heating and cooling
loads.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Joe Hager<BR>DMI<BR>450 Lexington St.<BR>Newton,
MA 02466<BR>voice: 617-527-1525 ext. 102<BR>fax:
617-527-6606</FONT> </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=keirh@bluestoneenergy.com
href="mailto:keirh@bluestoneenergy.com">Keir Howell</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=BLDG-SIM@gard.com
href="mailto:BLDG-SIM@gard.com">BLDG-SIM@gard.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, August 30, 2004 11:25
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [BLDG-SIM] Modeling 100% OA
VAV systems in eQuest</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2>Hello. Whenever
I try to model a VAV system with 100% OA in eQuest, I end up with a constant
volume system. It seems to be multiplying the Minimum OA Ratio (which I have
set at 1.00) by the design air flow, rather than the hourly air flow, even
though I have set the Minimum OA Method to "Fraction of Hourly Flow". As far
as I know, I have not set any other variables (such as zonal settings) that
might override the system settings. Please help. Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Keir Howell<BR>Bluestone Energy Services,
Inc.<BR>phone: 781-356-8865<BR>fax:
781-356-8864</FONT></DIV><PRE>==================
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