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You can model the exhaust fans as the Return fan. Set the
MIN-OUTSIDE-AIR to 1. To model VAV you need to set a
MIN-CFM-SCHEDULE to match the behaviour of the fume hoods opening and
closing (it is tricky to determine exactly this behavior). This way
you can attempt to capture any heat recovery available.<br><br>
<br>
<blockquote type=cite class=cite cite>"urn:schemas-microsoft-com:office:office"
xmlns:w = "urn:schemas-microsoft-com:office:word" xmlns:st1 =
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<font face="arial" size=2>Unless you can predict exactly how the fume
cupbards will be utilised, is there a need to model them as VAV? I
used DOE-2.2 a couple of years ago to look at a similar arrangement and
we diversified the fume cupboards so that we effectively modelled a
constant exhaust rate. Set this up as a parameter and then run for
different values to see how sensitive performane is to fume cupboard use
/ diversity ...<br>
Graham<br>
</font>
<dl>
<dd>----- Original Message ----- <br>
<dd>From:</b> <a href="mailto:razerbegi@rmhgroup.com">Azerbegi, Renee</a>
<br>
<dd>To:</b> <a href="mailto:BLDG-SIM@gard.com">BLDG-SIM@gard.com</a> <br>
<dd>Sent:</b> Saturday, March 20, 2004 3:13 AM<br>
<dd>Subject:</b> [BLDG-SIM] VAV fume hood exhaust<br><br>
<dd><font face="arial" size=2 color="#0000FF">Has anyone modeled a VAV fume hood exhaust for a laboratory in eQuest? Since the laboratory requires 100% outside air, a return fan is not simulated obviously. The exhaust fan part on the air-handling unit fan page of eQuest doesn't seem to be able to be modeled. If I put the exhaust in each zone, then I can't specify that the fans are VAV. Please let me know if you have had luck with modeling this type of system in eQuest.<br>
<dd>Thanks,<br>
<dd>Renee<br>
</font>
<dd> <br>
<dd> <br>
<dd><font face="arial" size=2 color="#0000FF">Renee Azerbegi<br>
<dd>RMH Group<br>
<dd>Lakewood, Colorado<br>
<dd>303-239-0909<br>
</font>
<dd> <br>
<dd> <br>
<dd> <br><br>
</dl><br><br>
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Chris Jones, P.Eng.<br>
14 Oneida Avenue<br>
Toronto, ON M5J2E3<br>
Tel. 416 203-7465<br>
Fax. 416 946-1005</font><PRE>
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