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<div class=Section1>
<p class=MsoNormal><span style='color:#1F497D'>Thanks to all for your
responses. As an update, my models are now coming more into line, in fact they
are appearing to match very closely with the 20% rule-of-thumb that Anthony has
seen in his experience. The primary contributors to the eQUEST model becoming more
accurate were:<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo5'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>The Previous Years
of Operation field was set to “0”, so I changed it to be “20”.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo5'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>I loaded in some
typical ClimateMaster performance curves in lieu of using the default eQUEST
curves.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I now have an eQUEST model that
is utilizing an 80-bore hole well field with bore lengths approximately 20% shallower
than what is being calculated by the Gaia GLD software.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Thanks again for all the input.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Garamond","serif";
color:#960028'>Dan Russell<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Garamond","serif";
color:#C00000'><img width=197 height=140 id="_x0000_i1027"
src="cid:image001.png@01CAEAAE.7E061F60" alt="EI Signature"></span><span
style='font-size:14.0pt;font-family:"Garamond","serif";color:#CA0002'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Anthony Hardman
[mailto:Anthony@geoenergyservices.com] <br>
<b>Sent:</b> Thursday, April 29, 2010 1:57 PM<br>
<b>To:</b> Dan Russell; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Equest-users] Geothermal Well Field Modeling<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Dan, not sure if you got all
your questions answered? <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I typically see about a 20%
smaller GHEX with eQUEST when compared to GLD. I also believe it is the
most accurate tool between the two for a couple of reasons. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='margin-left:.25in;text-indent:-.25in;
mso-list:l0 level1 lfo2'><![if !supportLists]><span style='color:#1F497D'><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>eQ models the heat
transfer on an hourly basis. GLD does not. If you look at the Zone
Manager, GLD takes the monthly peak and cumulative loads and arbitrarily
assigns those loads into one 12 hour block and three 4 hour blocks, and then
uses that profile for the entire month. <o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:.25in;text-indent:-.25in;
mso-list:l0 level1 lfo2'><![if !supportLists]><span style='color:#1F497D'><span
style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>After talking to
Gaia “support,” I’m not correct that their equipment libraries interface
correctly with GHEX sizing algorithms (and that’s probably more than I should
say about that). <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Some other thoughts:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>4 subfields will
always have more capacity than a single field of equivalent bore length.
So that accounts for some of your error, maybe 10%.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>You can select
“real” manufacturer performance data within the eQuest wizard by clicking the
“Select from GSHP Library” command(see screenshot). Since ClimateMaster
developed the add-on, you’re limited to their equipment choices of
course. I never use the default performance curves, I simply choose the
closest CM unit. <o:p></o:p></span></p>
<p class=MsoListParagraph><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Although the totals
are the same, I use report SS-D (not SS-l) for these comparisons. <o:p></o:p></span></p>
<p class=MsoListParagraph><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Make sure you’re
setting your “Years of Previous Operation” to 20 so that you account for long
term temperature creep. Just because the GHEX works in year 1 doesn’t
mean it’ll work in year 20.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><b><span style='color:#1F497D'>Anthony Hardman<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='color:black'>Building Energy Analyst<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'>LEED AP<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:14.0pt;color:#9BBB59'>Geo-Energy
Services<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'>14250 E Easter Pl, STE C<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'>Centennial, CO 80112<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'>303-531-5292 v<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'>303-805-3563 f<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'>720-273-9973 c<o:p></o:p></span></p>
<p class=MsoNormal><u><span style='font-size:12.0pt;color:#0070C0'><a
href="http://www.geoenergyservices.com">www.GeoEnergyServices.com</a><o:p></o:p></span></u></p>
<p class=MsoNormal><u><span style='font-size:12.0pt;color:#0070C0'><o:p><span
style='text-decoration:none'> </span></o:p></span></u></p>
<p class=MsoNormal><span style='font-size:12.0pt;color:#0070C0'><img border=0
width=720 height=518 id="Picture_x0020_3"
src="cid:image002.png@01CAEAAE.7E061F60"><u><o:p></o:p></u></span></p>
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
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 10:35 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Geothermal Well Field Modeling<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<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-size:14.0pt;font-family:"Garamond","serif";
color:#960028'>Dan Russell<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Garamond","serif";
color:#C00000'><img border=0 width=197 height=140 id="Picture_x0020_1"
src="cid:image001.png@01CAEAAE.7E061F60" alt="EI Signature"></span><span
style='font-size:14.0pt;font-family:"Garamond","serif";color:#CA0002'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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