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<p class=MsoNormal><span style='color:#0000B4'>Nick,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'>The way I would approach this:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='color:#0000B4'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#0000B4'>Establish what the
minimum flow rate for each hood is (as a percentage of maximum). Most chemical
hoods have a minimum required cfm rate even when closed that flows through the
reagent shelf below to keep it ventilated. <o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='color:#0000B4'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#0000B4'>Establish a
diversity schedule for the hoods<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='color:#0000B4'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#0000B4'>In eQUEST v3.63 and
above you can specify airflow tracking for exhaust air streams on a thermal
zone basis – there’s a good help section on what the different
tracking options do. It’s my understanding that this was put in
specifically for fumehoods. Set your max flow rate here and set up a fraction
schedule to determine flow rate. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'>One thing you might want to
check up on is the fumehood density. If the lab is very fumehood intensive,
then it might make sense to go with the VAV hoods. However, if it’s a ventilation
driven lab (as opposed to an exhaust driven lab), you might as well have
constant volume hoods. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'>For instance, if your EHS
requires 6 air changes per hour in a 10 foot high 10,000ft2 lab, your supply
cfm = 10,000 cfm. Lets say you have 10 x 6’ wide fumehoods with 800cfm at
max sash height (18”). That would give you 8,000 cfm. So having VAV controls
on the hoods is not going to reduce your airflow unless you ramp down to below
5ACH during unoccupied hours. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#0000B4'>Hope this helps<o:p></o:p></span></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto'><b><span style='font-size:
12.0pt;font-family:"Garamond","serif";color:black'>Vikram Sami,</span></b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#0000B4'> </span><span
style='font-size:12.0pt;font-family:"Garamond","serif";color:black'>LEED AP</span><span
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</span><span style='font-size:12.0pt;font-family:"Garamond","serif";color:black'>Direct
Phone 404-253-1466 | Direct Fax 404-253-1366</span><span style='font-size:12.0pt;
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<p class=MsoNormal><span style='color:#0000B4'><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>Kugler,
Nicholas<br>
<b>Sent:</b> Monday, December 07, 2009 7:42 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Chemistry Laboratory Model<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am about to begin an energy model for a large university
lab project that includes about 150 VAV chemical fume hoods. The building
systems will include a true VAV exhaust system, not a bypass system. Please
advise how this can be modeled using eQuest. Thank you in advance.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b>Nick Kugler, LEED AP<o:p></o:p></b></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;color:#333333'>Mechanical
Engineering<o:p></o:p></span></i></p>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>874 Dixon Boulevard<o:p></o:p></span></p>
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