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<div class=Section1>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Dear Trnsys users<o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>In the supporting documents of ground source heat exchanger (type 919) I
could not find a clear cut definition about some parameters; for instance number
of boreholes in series and number of radial regions.<o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I want to raise it through an example:<o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I have 30 boreholes, in each borehole 1 U-tube. I want to link each 5 boreholes
series together. Therefore, there are 6 parallel loops where each parallel loop
includes 5 boreholes. Total flow rate is 30000 kg/hr. <o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I was wondering if you could give me your comment whether the following
parameters are correct. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<table class=MsoTableGrid border=1 cellspacing=0 cellpadding=0
style='margin-left:41.4pt;border-collapse:collapse;border:none'>
<tr>
<td width=130 valign=top style='width:97.45pt;border:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><b><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-weight:bold'>Parameter/Input
number<o:p></o:p></span></font></b></p>
</td>
<td width=203 valign=top style='width:152.45pt;border:solid windowtext 1.0pt;
border-left:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><b><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-weight:bold'>Description<o:p></o:p></span></font></b></p>
</td>
<td width=87 valign=top style='width:65.1pt;border:solid windowtext 1.0pt;
border-left:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><b><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-weight:bold'>Value<o:p></o:p></span></font></b></p>
</td>
</tr>
<tr>
<td width=130 valign=top style='width:97.45pt;border:solid windowtext 1.0pt;
border-top:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Par-4<o:p></o:p></span></font></p>
</td>
<td width=203 valign=top style='width:152.45pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Number of boreholes<o:p></o:p></span></font></p>
</td>
<td width=87 valign=top style='width:65.1pt;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>30<o:p></o:p></span></font></p>
</td>
</tr>
<tr>
<td width=130 valign=top style='width:97.45pt;border:solid windowtext 1.0pt;
border-top:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Par-6<o:p></o:p></span></font></p>
</td>
<td width=203 valign=top style='width:152.45pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>No. of boreholes in
series<o:p></o:p></span></font></p>
</td>
<td width=87 valign=top style='width:65.1pt;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>5<o:p></o:p></span></font></p>
</td>
</tr>
<tr>
<td width=130 valign=top style='width:97.45pt;border:solid windowtext 1.0pt;
border-top:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Par-7<o:p></o:p></span></font></p>
</td>
<td width=203 valign=top style='width:152.45pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Number of radial
regions<o:p></o:p></span></font></p>
</td>
<td width=87 valign=top style='width:65.1pt;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>5<o:p></o:p></span></font></p>
</td>
</tr>
<tr>
<td width=130 valign=top style='width:97.45pt;border:solid windowtext 1.0pt;
border-top:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Par-8<o:p></o:p></span></font></p>
</td>
<td width=203 valign=top style='width:152.45pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Number of vertical
regions<o:p></o:p></span></font></p>
</td>
<td width=87 valign=top style='width:65.1pt;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>10<o:p></o:p></span></font></p>
</td>
</tr>
<tr>
<td width=130 valign=top style='width:97.45pt;border:solid windowtext 1.0pt;
border-top:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Par-11<o:p></o:p></span></font></p>
</td>
<td width=203 valign=top style='width:152.45pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Negative of
u-tubes/bore<o:p></o:p></span></font></p>
</td>
<td width=87 valign=top style='width:65.1pt;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>-1<o:p></o:p></span></font></p>
</td>
</tr>
<tr>
<td width=130 valign=top style='width:97.45pt;border:solid windowtext 1.0pt;
border-top:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Par-19<o:p></o:p></span></font></p>
</td>
<td width=203 valign=top style='width:152.45pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Reference borehole flow
rate<o:p></o:p></span></font></p>
</td>
<td width=87 valign=top style='width:65.1pt;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>5000<o:p></o:p></span></font></p>
</td>
</tr>
<tr>
<td width=130 valign=top style='width:97.45pt;border:solid windowtext 1.0pt;
border-top:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>In-2<o:p></o:p></span></font></p>
</td>
<td width=203 valign=top style='width:152.45pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Inlet flow rate (total)<o:p></o:p></span></font></p>
</td>
<td width=87 valign=top style='width:65.1pt;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>30000<o:p></o:p></span></font></p>
</td>
</tr>
<tr>
<td width=130 valign=top style='width:97.45pt;border:solid windowtext 1.0pt;
border-top:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</td>
<td width=203 valign=top style='width:152.45pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</td>
<td width=87 valign=top style='width:65.1pt;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</td>
</tr>
</table>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Beside, if it is correct (my understanding on loops arrangement) , it
seems that changing the arrangement (changing number of series boreholes) does
not seriously change the heat exchanger output. Have you ever have such results.
I made different arrangement 2 parallel loop with 15 series borehole, 10
parallel loops with 3 series borehole,…) but the outlet temperature of
the heat exchanger was not significantly different. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Any comment based on your experiences on using this component would be
highly appreciated. <o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thanks for your time spending on this issue.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Regards<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Mehdi<o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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