<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7651.59">
<TITLE>eQuest - ERV and Preconditioning</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/rtf format -->
<P><FONT SIZE=2 FACE="Arial">Our team is modeling various energy recovery and preconditioning schemes for a 100%OA hospital campus. The simulation results for both our CV and VAV systems are unexpected as we change between different energy recovery/preconditioning strategies. I would REALLY appreciate any insight you could provide toward explaining the results below. </FONT></P>
<P><FONT SIZE=2 FACE="Arial">Our energy recovery schemes are "Sensible HX" (runaround coil or air-to-air plate & frame HX) with "Mixed Air Reset" temperature control accomplished by the "Modulate HX" strategy. The preconditioner is indirect evaporation operating together with the main coil (and all other default settings).</FONT></P>
<P><FONT SIZE=2 FACE="Arial">1) Runs without energy recovery or preconditioning are outperforming runs that include these strategies overall.</FONT>
</P>
<P><FONT SIZE=2 FACE="Arial">2) Energy recovery is increasing fan energy (expected - though perhaps not as big a difference was expected), increasing cooling energy slightly (unexpected with mixed air reset control), and decreasing heating energy (expected). The fan energy increase offsets any or all improvements on the heating side.</FONT></P>
<P><FONT SIZE=2 FACE="Arial">3) Indirect evap preconditioning is only slightly improving or in some cases increasing cooling energy (unexpected) and increasing heating energy (unexpected).</FONT></P>
<P><FONT SIZE=2 FACE="Arial">Thank you for your help! We are working hard to issue some results regarding these strategies soon.</FONT>
</P>
<P><FONT SIZE=2 FACE="Arial">Taylor</FONT>
<BR><FONT SIZE=2 FACE="Arial">________________________________________________________</FONT>
<BR><FONT SIZE=2 FACE="Arial">Taylor Keep</FONT>
<BR><FONT SIZE=2 FACE="Arial">Mechanical, LEED® AP</FONT>
<BR><FONT SIZE=2 FACE="Arial"><U> </U></FONT>
<BR><FONT SIZE=2 FACE="Arial">Arup </FONT>
<BR><FONT SIZE=2 FACE="Arial">901 Market Street Suite 260</FONT>
<BR><FONT SIZE=2 FACE="Arial">San Francisco, CA 94103</FONT>
<BR><FONT SIZE=2 FACE="Arial">tel: 415 946 0279</FONT>
<BR><FONT SIZE=2 FACE="Arial">fax: 415 957 9096</FONT>
<BR><FONT SIZE=2 FACE="Arial">taylor.keep@arup.com</FONT>
<BR><A HREF="file://www.arup.com"><U><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">www.arup.com</FONT></U></A>
</P>
<BR>
<pre>____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses
</pre><PRE>
===========================
You received this e-mail because you are subscribed
to the BLDG-SIM@GARD.COM mailing list. To unsubscribe
from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE@GARD.COM
</PRE></BODY>
</HTML>