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<DIV><FONT face=Arial size=2>Peter S,</FONT></DIV>
<DIV><FONT face=Arial size=2>The only thing I would add to what has been said is
stating the obvious, that fume hood exhaust diversifies across a building and
through the day so a single system OA schedule is likely sufficient rather than
attempting something zone by zone. Where we had a case of VAV fume hoods,
we assumed an average use (50%) and then ran sensitivity studies to bound the
likely performance ... At the time this worked for us.</FONT></DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Graham</FONT></DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=peter.alspach@arup.com href="mailto:peter.alspach@arup.com">Peter
Alspach</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>Cc:</B> <A title=bldg-sim@gard.com
href="mailto:bldg-sim@gard.com)">Building Sim Email (bldg-sim@gard.com)</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, April 09, 2005 5:43
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [BLDG-SIM] Variable flow
laboratory exhaust systems.</DIV>
<DIV><BR></DIV>
<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>
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