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<p class=MsoNormal><span style='color:#1F497D'>I can probably fill in a little
on the eQuest side of the coin:<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'>My general understanding is that
you should be able to use either Trace or eQuest to model process efficiency
which varies with the ground loop temperature.<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 approached this once in
eQuest, and based on that experience and as I think others have brought up, you’re
restricted to using a CW loop of the lake/well type, which means you must
define for the program what the temperature behavior of the GLHX is over the
year (as a schedule). <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'>Once the groundwater temps are
dealt with, from there you can either use the default loop-to-loop chiller curves
in the eQuest library, or define your own. The three curves separately
define the following:<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![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'>Effects of part load
on the EIR (EIR-fPLR)<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![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'>Effects of
temperatures on the capacity (CAP-fT)<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Effects of
temperatures on the EIR (EIR-fT)<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'>Unlike centrifugal chillers,
finding the manufacturers data necessary to make your own custom curves in
DOE2/eQuest is not a trial by fire – all the data for the above curves
may be found on a single spec sheet without conversions, depending on who your
WWHP manf is... There are some restrictions regarding pump quantities and
behavior of the “loop-to-loop chiller” system – I’d
advise you to carefully review the DOE2 dictionary entry and diagrams for “Loop-to-Loop
Heat-Pump” to get an sense of how the equipment behaves and how you may need
to react accordingly to match your proposed design.<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’d also refer you to not
miss a recent writeup/report posted to eQuest-users by Dana Troy detailing a
strategy/feasibility study to approach multi-stack heatpumps in eQuest…
something I could’ve used in the afore-mentioned project.<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 of luck!<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'>~Nicks<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@01CBD2A4.D7AE8780"
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<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>Smith &
Boucher Engineers</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><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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Alex Chapin<br>
<b>Sent:</b> Tuesday, February 22, 2011 2:00 PM<br>
<b>To:</b> John.S.Eurek@usace.army.mil; trace-users@lists.onebuilding.org;
bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Water to Water Heat Pumps (UNCLASSIFIED)<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>In TRACE:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The help file (press F1 on any screen in TRACE) and
User’s Manual are pretty helpful with how to model geothermal heat pumps,
I would suggest reading through those first. In terms of modeling the
appropriate ground loop temperatures and associated WWHP efficiency, there are
a couple of ways of doing it (see help file and User’s manual for
specifics). Just keep in mind that when you create a new WWHP in the Cooling
Equipment library and define the Full Load Energy Rate and the Design Entering
Condenser Water Temperature, you need to base them on the worst case entering
loop temperatures over the year. TRACE assumes you enter the efficiency at the
hottest and coldest entering condenser temperatures for Cooling and Heating
efficiency respectively and then uses the Power Consumed and Ambient Modification
Unloading Curves to adjust the efficiency for air-side load and change in
entering loop temperature.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>In eQUEST:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m a little rusty on eQUEST, but this is how I
remember it. You can enter the ground and well properties for your site and
system which will be the basis of entering loop temperature for the equipment
as a function of the load on the equipment over the year. eQUEST wants the
equipment efficiency at ARI conditions and then you enter the unloading curves
(see help/Documentation for more info on this). The concept here is similar to
TRACE but from what I remember it is more detailed.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Alex
Chapin, E.I.T., LEED AP BD+C</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Energy
Engineer</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>2rw
Consultants</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>T:
434-296-2116 ext. 305</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>F:
434-977-1862<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:18.0pt;font-family:Webdings;
color:green'>P</span><span lang=EN-GB style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#006600'> </span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:green'>Please consider the environment before printing this e-mail -
Thanks!</span></b><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoPlainText>Message: 1<o:p></o:p></p>
<p class=MsoPlainText>Date: Tue, 22 Feb 2011 10:37:34 -0600<o:p></o:p></p>
<p class=MsoPlainText>From: "Eurek, John S NWO" <<a
href="mailto:John.S.Eurek@usace.army.mil">John.S.Eurek@usace.army.mil</a>><o:p></o:p></p>
<p class=MsoPlainText>To: <<a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a>><o:p></o:p></p>
<p class=MsoPlainText>Subject: [Trace-users] Water to Water Heat Pumps
(UNCLASSIFIED)<o:p></o:p></p>
<p class=MsoPlainText>Message-ID:<o:p></o:p></p>
<p class=MsoPlainText> <<a
href="mailto:57E9627AE82514439A8F543A61BFDD6807D574F1@NWO-ML3OMA.nwo.ds.usace.army.mil">57E9627AE82514439A8F543A61BFDD6807D574F1@NWO-ML3OMA.nwo.ds.usace.army.mil</a>><o:p></o:p></p>
<p class=MsoPlainText> <o:p></o:p></p>
<p class=MsoPlainText>Content-Type: text/plain;
charset="us-ascii"<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Classification: UNCLASSIFIED<o:p></o:p></p>
<p class=MsoPlainText>Caveats: NONE<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>The EER of WWHP can vary from 11.8 to 23.3 depending on
the water temperature returning from the well field. Can Trace model
this?<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>We are designing a lot of geo-thermal heat-pumps. If we
can't model the benefit of the well-field accurately, we can't model the energy
use.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>John Eurek PE, LEED AP<o:p></o:p></p>
<p class=MsoPlainText>Mechanical Engineer,<o:p></o:p></p>
<p class=MsoPlainText>US Army Corps of Engineers<o:p></o:p></p>
<p class=MsoPlainText>Omaha District CENWO-ED-DA<o:p></o:p></p>
<p class=MsoPlainText>1616 Capitol Avenue<o:p></o:p></p>
<p class=MsoPlainText>Omaha, NE 68102<o:p></o:p></p>
<p class=MsoPlainText>Phone: (402) 995-2134<o:p></o:p></p>
<p class=MsoPlainText>email: <a href="mailto:john.s.eurek@usace.army.mil">john.s.eurek@usace.army.mil</a><o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Classification: UNCLASSIFIED<o:p></o:p></p>
<p class=MsoPlainText>Caveats: NONE<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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