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<p class=MsoNormal>eQuesters<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I'm having some difficulty with properly modeling exhaust
fans in for LEED and I'm hoping someone can provide me with some guidance. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Here's my problem: I can enter the exhaust volumes and
associated KW/cfm for each zone where necessary, but some of the spaces have design
exhaust volumes greater than design supply air volumes (negative pressure
rooms). If I select "infiltration" or "balanced
infiltration" as the source of exhaust makeup for these zones, then the
unmet hours for that zone become very high. If I select "air handler"
as the source of makeup air, then eQuest increases the design supply air volume
to match the exhaust air volume for that zone. This is problematic because the
SV-A reports now have values that do not match my mechanical schedules.
Additionally, the energy consumption associated with those systems increases as
a result of the increased supply air volume. All in all, it's just not an
accurate representation of the design. Most of these zones are expected to make
up the air through zonal air transfer (something I realize eQuest is unable to
do).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>At this point, I'm considering adding the exhaust energy as
a direct load to my meter along with appropriate usage schedules, and
associating it to "ventilation fans". I believe the net effect on
energy consumption and peak demand should be the same as if the exhaust fans
were explicitly modeled. However, I'm curious as to any dynamic system or
thermal effects that I may be circumventing by not explicitly modeling the
exhaust fans for each zone. My gut feeling is that there shouldn't be much of
an effect, but I'm just not sure. I'm also concerned that by modeling exhaust
energy as a direct load, rather than explicitly, the SV-A reports won't show
any exhaust volumes and thereby call attention as to the validity of the model.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>At this point, I would like the guidance of some of the
members on this forum that have more experience with these issues. Is this even
an acceptable way to account for exhaust fan energy for LEED? I'm open to any
suggestions from anyone who has run into these issues and/or may have
experience in how to deal with it.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks in advance<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b><span style='color:#17365D'>Seun Odukomaiya, EIT, LEED AP</span></b><span
style='font-size:10.0pt;color:#17365D'> |<i> Mechanical Engineer</i> | </span><b><span
style='color:#17365D'>L’Acquis Consulting Engineers</span></b><b><span
style='font-size:10.0pt;color:#17365D'> </span></b><span style='font-size:10.0pt;
color:#17365D'>|(317) 706-2075 Ext. 255 | </span><span style='color:#17365D'><a
href="http://www.laceindy.com/"><span style='color:#17365D'>www.lacquis.com</span></a></span><span
style='font-size:10.0pt'> | <span style='color:#17365D'>To transmit large
files, please use:</span> <span style='color:#17365D'><a
href="http://lacquis.leapfile.net/" target="_blank"><span style='color:#17365D'>http://lacquis.leapfile.net</span></a></span><span
style='color:navy'><o:p></o:p></span></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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