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<DIV dir=ltr align=left><SPAN class=159002015-24102007><FONT face=Arial
color=#0000ff size=2>Not sure how eQuest would handle this but could you not
create an electric boiler that is essentially the electric chiller acting as a
heater (COP of 3 versus 1) to simulate that and have a single heating piping
loop. Secondary boiler would be the purchased steam. Custom boiler curves to
simulate the electric chiller as a heater/heat pump over a range of
temperatures. Just a thought.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=159002015-24102007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=159002015-24102007><!-- Converted from text/rtf format -->
<P><SPAN lang=en-us><FONT face=Tahoma size=2>Regards,</FONT></SPAN> </P>
<P><SPAN lang=en-us><FONT face=Tahoma size=2>Kevin<B></B></FONT></SPAN>
<BR><SPAN lang=en-us><B><FONT face=Tahoma
size=2>_________________________________________</FONT></B></SPAN> </P>
<P><SPAN lang=en-us><B><FONT face=Verdana size=2>Kevin L. Wyman,
P.E.</FONT></B></SPAN> <BR><SPAN lang=en-us><FONT face=Verdana size=2>LEED
AP</FONT><B></B></SPAN> </P>
<P><SPAN lang=en-us><FONT face=Verdana size=2>On-site Power Product Management
</FONT></SPAN><BR><SPAN lang=en-us><FONT face=Verdana size=2>UTC
Power</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Verdana size=2>195
Governor's Highway</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Verdana
size=2>So. Windsor, CT 06074</FONT></SPAN> <BR><SPAN lang=en-us><FONT
face=Verdana size=2>860-727-7020 (V)</FONT></SPAN> <BR><SPAN lang=en-us><FONT
face=Verdana size=2>860-660-0723 (F)</FONT></SPAN> <BR><SPAN lang=en-us><FONT
face=Verdana size=2>860-882-9595 (M)</FONT></SPAN> <BR><SPAN lang=en-us><FONT
face=Verdana size=2>kevin.wyman@utcpower.com</FONT></SPAN> </P>
<P><SPAN lang=en-us><I><FONT face=Verdana color=#808080 size=1>"Fuel Cells,
Microturbines and Reciprocating Engines for combined cooling, heating and power
solutions"</FONT></I></SPAN> </P></SPAN></DIV><BR>
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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>Mark Nieman<BR><B>Sent:</B>
Wednesday, October 24, 2007 10:43 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 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>
<DIV> </DIV><BR>
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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><PRE>
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