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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Karen,<o:p></o:p></span></font></p>
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10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I suspect the problem is with how the
geothermal loop is being sized. Is the loop size based on the heating load?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Sincerely,<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Keith Swartz, PE, LEED® AP<o:p></o:p></span></font></p>
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w:insAuthor="Keith Swartz" w:insDate="2008-05-12T08:30:00Z"
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w:endInsDate="2008-05-12T08:30:00Z"><st1:Street w:st="on"><st1:address w:st="on"><font
color=navy><span style='color:navy'>455 Science Drive</span></font></st1:address></st1:Street></ns0:address></ns0:Street><font
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w:insDate="2008-05-12T08:30:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2008-05-12T08:30:00Z"><font color=navy><span style='color:navy'>Madison</span></font></ns0:City><font
color=navy><span style='color:navy'>, </span></font><ns0:State
w:insAuthor="Keith Swartz" w:insDate="2008-05-12T08:30:00Z"
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color=navy><span style='color:navy'>WI</span></font></ns0:State><font
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w:insAuthor="Keith Swartz" w:insDate="2008-05-12T08:30:00Z"
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color=navy><span style='color:navy'>53711</span></font></ns0:PostalCode></ns0:place><font
color=navy><span style='color:navy'><o:p></o:p></span></font></span></font></p>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Phone: 608-238-8276 ext. 123<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Fax: 608-238-0523<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a href="http://www.ecw.org/">www.ecw.org</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The Energy Center of Wisconsin is an
independent, nonprofit organization that seeks solutions to energy challenges.</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Karen Walkerman
[mailto:kwalkerman@gmail.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, May 11, 2008 8:58 AM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-sim] geothermal and
cooling tower WSHP</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Hi All,<br>
<br>
I'm working on a system where a geothermal loop and a cooling tower both supply
cooling to a WSHP loop. I am trying to control the loop so that cooling
load goes first to the geothermal loop and second to the cooling tower as the
ground loop will not be sufficient to provide cooling year-round.<br>
<br>
I have run up against some funny things.<br>
<br>
1. If I let the program auto-size the cooling tower and use it's default
control, I get a negative number for heat rejection energy (the cooling tower
is given a capacity of -10 MBTU/hr with fan energy listed at -41 kw)<br>
<br>
2. If I size the cooling tower according to design at 4.2 MBTU/hr, the
entire program shuts down<br>
<br>
3. If I try to run the model without the cooling tower, the entire
program shuts down<br>
<br>
Any thoughts?<br>
<br>
Thank You,<br>
<br>
--<br>
Karen<o:p></o:p></span></font></p>
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