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<DIV dir=ltr align=left><SPAN class=427434114-24102007><FONT face=Arial
color=#0000ff size=2>It sounds like you may not have specified a pump for your
chilled water loop. Check the loop and see if you have a pump assigned to it.
You'll need to be mindful of your pump energy to make sure you're not
overshooting what your actual system configuration will use.</FONT></SPAN></DIV>
<DIV> </DIV><!-- Converted from text/rtf format -->
<P><SPAN lang=en-us><FONT face=Arial size=2>Mark Nieman, PE, CEM</FONT></SPAN>
<BR><SPAN lang=en-us><FONT face=Arial size=2>Sr. Energy Engineer</FONT></SPAN>
<BR><SPAN lang=en-us><FONT face=Arial size=2>McKinstry Essention</FONT></SPAN>
<BR><SPAN lang=en-us><FONT face=Arial size=1>Direct: (206)
832-8152</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Arial size=1>Cell: (206)
510-4760</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Arial size=1>FAX: (206)
832-8552</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Arial size=1><A
href="http://www.mckinstry.com/">http://www.mckinstry.com</A></FONT></SPAN>
<BR><SPAN lang=en-us><I><FONT face=Arial size=1>"For The Life Of Your
Building"</FONT></I></SPAN> </P>
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<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>nicole chen<BR><B>Sent:</B>
Wednesday, October 24, 2007 7:37 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] how to simulate a four pipe
system with heat pump chiller providing cooling in summer and heating in
winter<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Dear all</DIV>
<DIV> </DIV>
<DIV>I am trying to simulate a four pipe system with heat pump chillers
providing cooling in summer and heating in winter and purchased steam as
supplemental heating source.I planed to build two loops for the project. One for
chilled water , another for hot water. But heat pump chillers can only be
attached to chilled water loop or two pipe loop , not hot water loop. So I built
one chilled water loop for cooling and one two pipe loop for heating . But
there is always a error message " the chilled water loop has zero flow rate". It
seemed a two pipe loop can not be build together with other type of loop ,such
as chilled water loop or hot water loop. I have no idea of it . I want to know
how to simulate such a system. Thank you in advance. <BR>-- <BR>Yours<BR>Nicole
Chen </DIV>
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