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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Raj,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>You can simulate a ground loop as a
lake/well loop by applying a temperature schedule to the lake/well loop. Your
annual schedule will have 12 weekly schedules set for each month of the year.
Then each weekly schedule will have a daily schedule. Each daily schedule
will have all 24 hours at the same temperature. I typically make weekly
(monthly) schedules that follow the anticipated loop temperatures (heating
design temp in March and cooling design temp in September and average ground
temperature in shoulder months). Your geothermal sizing software can give
you this temperature profile for your particular situation. If you don’t
do this, then the program assumes you have water available at the average
ground temperature all year from the lake/well loop.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>The bigger issue is that the loop-to-loop
heat pump library part load curves are not correct and WAY overestimate
cooling/heating savings. For example, using the same size/efficiency
water-source chiller will use ~5 times more cooling energy than a loop-to-loop
heat pump, mostly independent, of the condenser temperatures. Try it out
and let me know if you see the same thing in your model as it probably depends
on how much simultaneous heat/cool you have. You need to develop your own
equipment part load curves/curves that are a stronger function of condenser
temperature and not rely on the ones provided with eQUEST for loop-to-loop heat
pumps connected to a geothermal field.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Best of luck… -Jon<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
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<p class=section1 style='margin:0in;margin-bottom:.0001pt'><strong><b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>Jon Evans, PE, LEED AP</span></font></b></strong><strong><b><font
color=black face="Times New Roman"><span style='color:black'><o:p></o:p></span></font></b></strong></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><i><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;font-style:normal'>Senior Mechanical Engineer | <st1:PersonName
w:st="on">jevans@sustaineng.com</st1:PersonName></span></font></i></em><em><i><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;font-style:
normal'><o:p></o:p></span></font></i></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><i><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;font-style:normal'>Sustainable Engineering Group LLC<o:p></o:p></span></font></i></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><st1:Street w:st="on"><st1:address
w:st="on"><em><i><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black;font-style:normal'>901 Deming Way, Suite
201</span></font></i></em></st1:address></st1:Street><em><i><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;font-style:normal'> | <st1:place w:st="on"><st1:City w:st="on">Madison</st1:City>,
<st1:State w:st="on">Wisconsin</st1:State> <st1:PostalCode w:st="on">53717</st1:PostalCode></st1:place></span></font></i></em><em><i><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;font-style:normal'><o:p></o:p></span></font></i></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><i><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;font-style:normal'>608.836.4488 ext. 13 | Fax: 608.836.4477<o:p></o:p></span></font></i></em></p>
<p class=MsoNormal><em><i><font size=2 color="#000066" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#000066;font-style:normal'><a
href="http://www.sustaineng.com/"><font color=black><span style='color:black'>www.sustaineng.com</span></font></a></span></font></i></em><font
color="#000066"><span style='color:#000066'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
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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'> Kris Raj
[mailto:kris_raj@rocketmail.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Saturday, April 09, 2011
6:13 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Bldg-sim<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-sim] Central Ground
Source Heat Pump</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hello,<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>I am trying to
simulate a ground source heat pump system where the ground loop is attached to
a central water source four pipe heat pump system. The heat pump provides
both chilled and hot water simultaneously to the air handling units in the
building as required.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>The chiller type
loop to loop heat pump serves my purpose well. However the condenser loop
of this system can only be connected to a lake/Well. I need to connect this
system to a closed ground loop which I am unable to do so.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>The chiller type
Heat Pump allows connection to the ground loop. But, unfortunately this is only
a two pipe system and does not allow simultaneous heating and cooling.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>Could any one one
please advice me on how to model this.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>raj<o:p></o:p></span></font></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>
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