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<font face="Calibri">I just spent a while digging through all the
latest docs on modeling labs for a LEED analysis (90.1-2004,
90.1-2007, addenda, & Labs 21). This is my interpretation:<br>
</font>
<ul>
<li>If the <i>building</i> has fume hood exhaust over 15,000 cfm,
the Baseline system is VAV, and exhaust is turned down to at
least 50% for unoccupied hours. I am modeling the unoccupied
turn down rate the same in the Baseline as in the Proposed
models, because how low it can go at night depends on the type
of lab (ie: the project doesn't get more credit for turning down
to 20%). This is from Labs 21, and 90.1 (2004 or 2007) section
6.5.7.2.<br>
</li>
<li>A project can claim energy savings for demand controlled fume
hoods during occupied hours if the controls are automatic
(Labs21 has some schedules for guidance in modeling this).</li>
<li>Energy recovery is not modeled in the Baseline (see 90.1-2007
G3.1.2.10 Exception h).</li>
</ul>
Let me know if you have a different interpretation....I don't think
all these issues are laid out in detail for modelers yet.<br>
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<font color="#006600" face="Calibri"><b>Aleka Pappas</b></font><font
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<div class="moz-signature"><font face="Calibri"><small><font
color="#333399"><big><font color="#006600"><small>Building
Energy
Engineer</small></font></big></font></small></font>
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<pre class="moz-signature" cols="72"><font color="#333399" face="Calibri"><font color="#000066"><b>ENERMODAL ENGINEERING, INC.
</b><i>Inspiring energy and resource efficient buildings.</i><b>
</b><b><a class="moz-txt-link-abbreviated" href="http://www.enermodal.com/">www.enermodal.com</a></b>
</font><font color="#000066">1325 E. 16th Ave.
Denver, CO 80218
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Office: 303.861.2070/ Direct: 720.221.1082</font></font></pre>
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<br>
On 8/31/2010 12:35 PM, varun kulkarni wrote:
<blockquote
cite="mid:AANLkTinndohmsWvLHR72+ZZ4rkZ=gE1bkOUmhdh5kXeb@mail.gmail.com"
type="cite">
<div>I think it also depends on the software you are using to
model a fume hood. Because if exhaust is specified more than the
supply due to the hood, the software may disregard the lower
supply and equate the higher value of exhaust to the supply. I
am also trying to model a VAV exhaust fume hood and facing a
lot of problems doing it. So you have to figure out a way to
control you exhaust by altering your VAV supply.</div>
<div>If you know some other way, please let me know also :)<br>
<br>
</div>
<div class="gmail_quote">On Tue, Aug 31, 2010 at 2:23 PM, Sami,
Vikram <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:Vikram.Sami@perkinswill.com">Vikram.Sami@perkinswill.com</a>></span>
wrote:<br>
<blockquote style="border-left: 1px solid rgb(204, 204, 204);
margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"
class="gmail_quote">I think that depends on the total volume
of exhaust. I don't have it in front of me, but I think if
your exhaust is more than a certain amount you have to have
either energy recovery to fifty percent or vav flow.<br>
<br>
Sent from a mobile device<br>
<br>
-----Original Message-----<br>
From: Peter Simmonds [mailto:<a moz-do-not-send="true"
href="mailto:peter.simmonds@ibece.net">peter.simmonds@ibece.net</a>]<br>
Sent: Tuesday, August 31, 2010 12:09 PM Central Standard
Time<br>
To: <a moz-do-not-send="true"
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
Subject: [Bldg-sim] Modeling fume hood exhausts<br>
<br>
Can anyone tell me when modeling a lab system with fume hoods
as to whether the baseline systems are to be modeled as
constant volume?<br>
<br>
(subsequent alternatives will have variable volume fume
hoods).<br>
<br>
<br>
<br>
Peter Simmonds,Ph.D.<br>
Senior Associate<br>
<br>
IBE Consulting Engineers<br>
14130 Riverside Drive, Suite 201<br>
Sherman Oaks, CA 91423<br>
p: (818) 377-8220 x246 f: (818) 377-8230<br>
<br>
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-- <br>
<p style="margin: 0in 0in 0pt;"><a moz-do-not-send="true"
name="SafeHtmlFilter__MailAutoSig"><span><font size="3"><font
face="Calibri">Thanks and Best Regards,</font></font></span></a></p>
<p style="margin: 0in 0in 0pt;"><span><span><font size="3"
face="Calibri"> </font></span></span></p>
<p style="margin: 0in 0in 0pt;"><span><span><font size="3"><font
face="Calibri">Sincerely,</font></font></span></span></p>
<p style="margin: 0in 0in 0pt;"><span><span><font size="3"><font
face="Calibri">Varun Kulkarni , M.S. , EIT</font></font></span></span></p>
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