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<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=185390923-12072007>Hi Aleka,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=185390923-12072007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=185390923-12072007>A different sort of question comes to mind. Once
heated to 180F, what is the fluid return temperature? If above 110F it
seems like it will heat the geothermal loop from the boiler. Another
possibility is to select the fan-coils units to work using the 110F
supply. Otherwise, the fan-coil/boiler loop may need to be completely
separate.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=185390923-12072007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=185390923-12072007>Good luck,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=185390923-12072007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=185390923-12072007>Michael Haughey</SPAN></FONT></DIV>
<DIV> </DIV>
<DIV align=left><FONT face="Monotype Corsiva">Silvertip Integrated Engineering
Consultants</FONT></DIV>
<DIV align=left><FONT face="Monotype Corsiva">303-650-1080</FONT></DIV>
<DIV align=left><FONT face="Monotype Corsiva">Cell:
303-903-4722</FONT></DIV>
<DIV align=left><FONT face="Monotype Corsiva">Fax:
303-430-1402</FONT></DIV>
<DIV align=left><FONT
face="Monotype Corsiva">mhaughey@earthlink.net</FONT></DIV>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Aleka Pappas<BR><B>Sent:</B>
Thursday, July 12, 2007 10:55 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] central heat pumps and
circulation loops<BR></FONT><BR></DIV>
<DIV></DIV>Hi all,<BR>I'm trying to model a central ground water source heat
pump serving hot & cold water loops for a radiant heating & cooling
system in eQuest. The 110 F hot water loop from the heat pump (loop to
loop HP type chiller) serves the radiant system directly, and has a secondary
loop with a boiler attached to it to bring the temperature up from 110 F to 180
F to serve some fan coil units. <BR>I'm having a hard time configuring the
loops and plant equipment to even approximate this system. Has anyone
tried to model something like this in eQuest? From what I understanding,
you can't put a boiler on a secondary loop, and I'm hitting a wall with
that. If I put the boiler and the HP on the same primary loop, I get
errors that tell me 180 F is too high a temperature for a GSHP water loop.
The closest I seem to be able to get is to model the system with two separate HW
loops - one for the fan coils with only a boiler and one for the radiant system
with the HP. But, then I can't use the heat pump to preheat for the FCU
loop with this model. <BR><BR>Any
thoughts?<BR><BR>Thanks,<BR>Aleka<BR><PRE>
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