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<p class=MsoNormal><span style='color:#1F497D'>Colleen,<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'>If you’re in the boat of
not having the borefield built or designed yet to reference from, you can get a
good estimation of a system that would work for your site by investing some
time into learning and using the free program GS2000 – check out my other
posting I made this afternoon “</span>RE: [Equest-users] Hybrid GSHP<span
style='color:#1F497D'>.”<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'>That said, eQuest can still trip
up even if you’ve entered all properties of your well field accurately in
the wizards. Here are some tips assuming you’ve done that:<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Recognize to start that
no GLHX should be operating at -31F. You can go below freezing (using
antifreeze!!!), but start with a design temperature range in mind that meets
both the minimum/maximum recommended by your heatpump manufacturer (it’s
in their spec sheets). Even better – figure out what COP / EER
values you want your system to operate at in the winter/summer respectively,
and use those same spec sheets to read off what minimum/maximum temperatures
make sense to be sure you’re in that range or better.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Once you know what
range is desired, you can try to assess what, entered or defaulted incorrectly,
is causing such an extreme temperature outside of your target temperature
range. Some things may include:<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo1'><![if !supportLists]><span style='font-family:"Courier New";
color:#1F497D'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>A loop head that
doesn’t make sense<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo1'><![if !supportLists]><span style='font-family:"Courier New";
color:#1F497D'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>A pump whose GPM has
been defined (or auto-sized) to something way too low (or zero), causing the
fluid in the field to move slowly and get so cold<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo1'><![if !supportLists]><span style='font-family:"Courier New";
color:#1F497D'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Mistakenly entered
GLHX borefield/ground properties can certainly have a great effect –
perhaps you meant for your bores to be 400ft deep but accidentally entered 40?
Give these properties a once-over to be sure nothing’s amiss.<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo1'><![if !supportLists]><span style='font-family:"Courier New";
color:#1F497D'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Double check the
operating parameters of any associated equipment to be sure everything is running
that should be at the time your extreme case happens… maybe eQuest is
appropriately set to auto-size all of your terminal heatpumps correctly, but
for some reason they aren’t running when they should be putting heat into
the loop?<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo1'><![if !supportLists]><span style='font-family:"Courier New";
color:#1F497D'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Make sure everything
that should be is assigned to the loop<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo1'><![if !supportLists]><span style='font-family:"Courier New";
color:#1F497D'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Is there any
intended source of auxiliary electric/gas heat at the units that isn’t
firing up, causing your GLHX to shoulder 100% of the heating demand?<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'>Hassan is correct in that the
GLHX (well field) itself will not be auto-sized by eQuest – in other
words it won’t know that your 5 x 10 vertical well borefield of 25’
spacing and 300’ depth really needs to be 5 x 20 and have a depth of 500’.
To be fair, eQuest does I believe have the capacity auto-size some elements
like circ-pump size based on your GLHX inputs. <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'>eQuest has a capacity to model thermal
behavior of GLHX’s for certain kinds of systems, to a limited degree of
control over the GLHX parameters. From an accuracy/flexibility standpoint
however, I think you’re better off picking up something like GS2000 to design,
model and re-design a GLHX, then export it’s thermal behavior (in the
form of monthly temperature averages) into eQuest by means of creating a custom
temperature schedule for a well-type loop, to which your heatpumps and other associated
equipment would be attached and accounted for. GS2000 itself is not
without design limitations (“free” always has a cost), but once you
understand it you’ll also feel like designing GLHX’s with eQuest is
like hammering nails with a screwdriver (frustrating, time consuming, ultimately
painful)!<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'>Best wishes,<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'>~Nick<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='color:#1F497D'><img width=119 height=37
id="Picture_x0020_1" src="cid:image001.jpg@01CA4770.F65A9040"
alt="cid:489575314@22072009-0ABB"></span><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</span><span
style='font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west
valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913
344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913
345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;color:#2D4D5E'>Check out
our new web-site @ </span></i><span style='color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;color:blue'> </span></u><span style='color:#1F497D'><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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Zareh,
Hassan<br>
<b>Sent:</b> Wednesday, October 07, 2009 2:28 PM<br>
<b>To:</b> Colleen Nelson; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Ground-loop HX Error<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:black'>Colleen,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'>eQuest doesn’t auto size the
GSHX. You should define the specification of the borefield.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>Hassan<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<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>Colleen
Nelson<br>
<b>Sent:</b> Wednesday, October 07, 2009 3:16 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Ground-loop HX Error</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I receive the following error message when attempting to run
simulation:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>
Ground-loop HX: GLHX (VertWell-CM) is undersized for the load and is
producing an extreme temperature of -31F.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I allowed eQUEST to auto-size the GSHP equipment.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Any help is appreciated.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Colleen Nelson, LEED-AP<o:p></o:p></p>
<p class=MsoNormal>Mechanical Engineering<o:p></o:p></p>
<p class=MsoNormal>Michaud Cooley Erickson<o:p></o:p></p>
<p class=MsoNormal>612.673.6995<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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