<!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 6.5.7638.1">
<TITLE>eQUEST v.3.6 - Hot Water Loop Heating Capacity Different from Plant Size</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/rtf format -->
<P><FONT SIZE=2 FACE="Arial">Hello all, I am simulating an H-shaped, 13 story, 600,000 square foot, 50+ year old office building in Seattle, WA with the core zones served by a dual-duct system and the perimeter zones served by a 4-pipe fan coil system. The systems run 24 hours a day with no setback. eQUEST reports an air handler summary heating design load of 39.6 Btuh/sf which appears within reason for this type of setup.</FONT></P>
<P><FONT SIZE=2 FACE="Arial">My concern is the discrepancy between Hot Water Loop Heating Capacity in the PV-A report vs. the Hot Water Loop Peak Net Load in the PS-D report. The PV-A Circulation Loop Heating Capacity number is -23.700 MBTU/HR, which corresponds with the 39.6 Btuh/sf reported under the Air-Side HVAC Summary sheet. In the PS-D report, the Hot Water Loop Peak Net Load is -8774.2 KBTU/HR, which is 37% of the value in PV-A. The PS-C, Equipment Loads and Energy Use report also agrees with PS-D, showing the boiler peak Heat Load at -8774.2 KBTU/HR, with hours of operation showing up in all part load ranges, totaling 8,595 hours of operation per year (due to the reheat system and 24 hour operation).</FONT></P>
<P><FONT SIZE=2 FACE="Arial">Am I understanding correctly that the -23.7 MBTU/HR is a peak connected load (sum of the air handler/zone heating coils), but that the hot water boiler plant will see only a peak of -8774.2 KBTU/HR because of diversity? Any insight would be much appreciate.</FONT></P>
<P><FONT SIZE=2 FACE="Arial">Mark Nieman, PE, CEM</FONT>
<BR><FONT SIZE=2 FACE="Arial">Sr. Energy Engineer</FONT>
<BR><FONT SIZE=2 FACE="Arial">McKinstry Essention</FONT>
<BR><FONT SIZE=1 FACE="Arial">Direct: (206) 832-8152</FONT>
<BR><FONT SIZE=1 FACE="Arial">Cell: (206) 510-4760</FONT>
<BR><FONT SIZE=1 FACE="Arial">FAX: (206) 832-8552</FONT>
<BR><A HREF="http://www.mckinstry.com"><U><FONT COLOR="#0000FF" SIZE=1 FACE="Arial">http://www.mckinstry.com</FONT></U></A>
<BR><I><FONT SIZE=1 FACE="Arial">"For The Life Of Your Building"</FONT></I>
</P>
<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>