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<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">I’m wrestling with an energy model for a lab building and have a quick question about fumehood exhaust. </FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">ASHRAE 90.1 says the following about fume hood exhaust</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=2 FACE="TT118Co00">6.5.7.2</FONT></SPAN><SPAN LANG="en-us"><B></B></SPAN><SPAN LANG="en-us"><B></B></SPAN><SPAN LANG="en-us"><B> <FONT SIZE=2 FACE="Times New Roman">Fume Hoods.</FONT></B></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT SIZE=2 FACE="Times New Roman">Buildings with fume hood systems</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">having a total exhaust rate greater than 15,000 cfm shall</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">include at least one of the following features:</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">(a) Variable air volume hood exhaust and room supply systems</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">capable of reducing exhaust and makeup air volume</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">to 50% or less of design values.</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">(b) Direct makeup (auxiliary) air supply equal to at least 75%</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">of the exhaust rate, heated no warmer than 2°F below</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">room setpoint, cooled to no cooler than 3°F above room</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">setpoint, no humidification added, and no simultaneous</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">heating and cooling used for dehumidification control.</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">(c) Heat recovery systems to precondition makeup air from</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">fume hood exhaust in accordance with 6.5.6.1 (Exhaust</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT SIZE=2 FACE="Times New Roman">Air Energy Recovery) without using any exception.</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> </FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">My question is this:</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">If the lab is equipped with snorkels, does this count towards this calculation, or is this strictly for fumehoods? (My guess is the term “fume hood systems” includes snorkels. </FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">My other question is this:</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">We are currently doing heat recovery (so we have criterion (c) covered). If we are using constant volume hoods with off peak hour setback, can we take credit for that, or do we need to reflect that in both the base model and the designed building? In reality since this is a teaching lab the hoods will be open most of the time, and the difference in performance with a VAV fumehood and a CAV hood with setback would be nonexistent.</FONT></SPAN><SPAN LANG="en-us"> </SPAN></P>
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