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<DIV dir=ltr align=left><SPAN class=348512819-08042005><FONT face=Arial
color=#0000ff size=2>Peter,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=348512819-08042005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=348512819-08042005><FONT face=Arial
color=#0000ff size=2>I don't have VisualDOE, but in eQuest at the zone level you
can set a min. flow schedule. You could use this to emulate the 2-position flow
you desire. During the day the min. flow would be 1 (full design) and at night
it would be 0.4. The SA flow rate should only go higher than the min. flow if
the load requires it, doubtful for the labs under either condition. If memory
serves me those commands are also available in 2.1E. With this and a VFD fan you
can simulate variable position hoods and even cover a mix of CAV and VAV
labs.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=348512819-08042005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=348512819-08042005><FONT face=Arial
color=#0000ff size=2>Peter</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> postman@gard.com [mailto:postman@gard.com]
<B>On Behalf Of </B>Peter Simmonds<BR><B>Sent:</B> Friday, April 08, 2005 9:25
AM<BR><B>To:</B> BLDG-SIM@GARD.COM<BR><B>Subject:</B> [BLDG-SIM] Variable flow
laboratory exhaust systems.<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">OK , its Friday so I am allowed to
ask for advice and guidance.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Firstly I am using VisualDoe, I am
modeling the energy performance of a 200,000 sf building which has 60,000 sf of
laboratories. The labs all have fume hoods so the supply air is balanced to the
exhaust air (100% OA).. Now I have the following problem: a fan system is either
on or off, therefore the lab fans are on 24 hours a day. I would like to reduce
the exhaust flow during unoccupied periods to exhaust air from the fume hoods at
their minimum flow of 40%. Reducing the flow would also reduce the make up of
outside air to balance the flow and obviously reduce energy
consumption.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Am I missing something here or does
anyone have a magic trick that will allow me to accomplish my goal. Simply said
HELP<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Peter Simmonds
Ph.D.</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Associate</SPAN></FONT><BR><FONT
face=Arial color=gray size=1><SPAN
style="FONT-SIZE: 7.5pt; COLOR: gray; FONT-FAMILY: Arial">IBE Consulting
Engineers</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><st1:Street w:st="on"><st1:address
style="BACKGROUND-POSITION: left bottom; BACKGROUND-IMAGE: url(res://ietag.dll/#34/#1001); BACKGROUND-REPEAT: repeat-x"
tabIndex=0 w:st="on"><FONT face=Arial color=gray size=1><SPAN
style="FONT-SIZE: 7.5pt; COLOR: gray; FONT-FAMILY: Arial">14130 Riverside Drive
Suite 201</SPAN></FONT></st1:address></st1:Street><o:p></o:p></P>
<P class=MsoNormal><st1:City
style="BACKGROUND-POSITION: left bottom; BACKGROUND-IMAGE: url(res://ietag.dll/#34/#1001); BACKGROUND-REPEAT: repeat-x"
tabIndex=0 w:st="on"><st1:place
style="BACKGROUND-POSITION: left bottom; BACKGROUND-IMAGE: url(res://ietag.dll/#34/#1001); BACKGROUND-REPEAT: repeat-x"
tabIndex=0 w:st="on"><FONT face=Arial color=gray size=1><SPAN
style="FONT-SIZE: 7.5pt; COLOR: gray; FONT-FAMILY: Arial">Sherman</SPAN></FONT></st1:place></st1:City><FONT
face=Arial color=gray size=1><SPAN
style="FONT-SIZE: 7.5pt; COLOR: gray; FONT-FAMILY: Arial"> Oaks, CA
91423<BR>p: (818) 377-8220<BR>f: (818)
377-8230<BR>m: (818) 219-1284<BR><A title=http://www.ibece.com/
href="BLOCKED::http://www.ibece.com/"><FONT title=http://www.ibece.com/
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<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV><PRE>
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