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<DIV><FONT color=#0000ff face=Calibri><SPAN
class=352484616-29042010>ClimateMaster has a plug-in for eQUEST that you could
look at to evaluate real vs defaults.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Calibri><SPAN class=352484616-29042010><A
href="http://www.climatemaster.com/index/equest_download?highlight=eQUEST">http://www.climatemaster.com/index/equest_download?highlight=eQUEST</A></SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN
class=352484616-29042010></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN
class=352484616-29042010></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff size=2 face=Arial></FONT> </DIV>
<DIV><FONT color=#0000ff size=2 face=Arial></FONT> </DIV>
<DIV><BR></DIV>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
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<FONT size=2 face=Tahoma><B>From:</B> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Dan
Russell<BR><B>Sent:</B> Thursday, April 29, 2010 12:35 PM<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] Geothermal
Well Field Modeling<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal>Hi All – I am wondering if anyone has much experience with
the geothermal well field capabilities of eQUEST, in particular with vertical
well fields. I am concerned about the accuracy of the calculation
methodology for the vertical well fields, primarily due to a large discrepancy
we are getting between the eQUEST results and the results of a separate
geothermal well field software produced by Gaia Geothermal. Here are the
parameters:<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Vertical well field<o:p></o:p></P>
<P class=MsoNormal>Ground conditions & well field dimensions are identical
in both eQUEST and Gaia simulations.<o:p></o:p></P>
<P class=MsoNormal>Equest model has four 4x5 rectangular well fields (80 bore
holes total) with 200 ft bore depth. Plant report PS-C shows that the
fourth well field has no load, thus using at most 60 of the 200 ft wells.
<o:p></o:p></P>
<P class=MsoNormal>Gaia software inputs load data from the DOE2 report SS-I for
each zone along with the matching heat pump size (specific to manufacturer)
selected for the project for the zone. This software uses its knowledge of
the heat pump performance to generate the required well-field size and
depth. The result is 120 well fields of 250 ft bore depth or 80 well
fields of 350 ft bore depth. <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I would expect some discrepancy between different software,
but in this case the eQUEST simulation is using only about 50% of the required
well-field size calculated by the Gaia software. The Gaia calculation is
coming out much larger than what the owner and design-build contractor had
planned for.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>How reliable is the eQUEST simulation on vertical
well-fields? <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I believe the primary difference is that Gaia software uses
“real” manufacturer performance data for heap pump models specified and eQUEST
uses PVVT system with default GSHP performance curves. Could this
difference really make such huge impact on the results?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Thanks in advance for any insight.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Garamond','serif'; COLOR: #960028; FONT-SIZE: 14pt">Dan
Russell<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Garamond','serif'; COLOR: #c00000; FONT-SIZE: 14pt"><IMG
id=Picture_x0020_1 alt="EI Signature" src="cid:352484616@29042010-0104"
width=197 height=140></SPAN><SPAN
style="FONT-FAMILY: 'Garamond','serif'; COLOR: #ca0002; FONT-SIZE: 14pt"><o:p></o:p></SPAN></P>
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