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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Has anyone had any luck modeling a Multistack (http://www.multistack.com/)
unit in eQUEST?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>We have a project that uses a Multistack unit to provide hot and
chilled water to a project and is coupled to a vertical bore field. eQUEST does
not have the capability to model system directly, so I have been trying to look
into other methods, all which are falling short. So far I have tried:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo4'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Using the "Loop-to-Loop Heat Pump" chiller; however,
this system does not work like the Multistack, as the Multistack does not have
internal heat exchange, has multiple compressor stages which are all piped in
parallel with the condenser water, and can only be connected to a Lake/Well
loop.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo4'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Using a separate chilled water loop and hot water loop, each of
which are connected to a WLHP loop with a vertical bore HX. This would be
perfect, as I can put as many chillers and boilers on the loops as there are
stages in the Multistack; however, eQUEST does not have a heat-pump boiler, so the
boiler cannot be connected to the vertical bore field.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo4'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Using a dummy space/zone/system connected to a dummy heat
recovery chiller. The chiller would then reject heat to the hot water loop that
supplies the rest of the building. This would work, however the chiller demand
is driven by the cooling load of the dummy system and it is impossible to
create a dummy cooling load that would exactly match the heating load required
by the hot water loop.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l2 level1 lfo4'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>And finally, using a domestic hot water loop because the boiler
type can be set to "heat pump", however, the heat cannot be rejected
to a condenser water loop.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>So I guess the question I am asking is has anyone either successfully
modeled the Multistack unit OR modeled a heat pump boiler?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks in advance.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>-Dana<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><br>
</span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Dana Troy</span></b><span style='color:#1F497D'><br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Energy Analyst</span><span style='color:#1F497D'><br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>LEED<sup>®</sup> Accredited Professional</span><span
style='color:#1F497D'><br>
<br>
</span><a href="http://www.glumac.com/"><span style='text-decoration:none'><img
border=0 width=339 height=37 id="Picture_x0020_1"
src="cid:image001.gif@01CA19A6.A02D7680"
alt="http://www.glumac.com/glumacsig.gif"></span></a><span style='color:#1F497D'><o:p></o:p></span></p>
<div>
<div>
<div class=MsoNormal><span style='color:#1F497D'>
<hr size=2 width=330 style='width:247.5pt' noshade style='color:#9ACB33'
align=left>
</span></div>
</div>
</div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>320 SW Washington, Suite 200</span><span style='color:#1F497D'><br>
</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Portland, OR 97204-2640</span><span style='color:#1F497D'><br>
</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>T. 503.227.5280 F. 503.274.7674<br>
<br>
</span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#333333'>Thinking. Inside the building.</span></b><span style='font-size:
9.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#333333'><a href="http://www.glumac.com/">www.glumac.com</a></span><span
style='color:#1F497D'> <br>
<img border=0 width=309 height=23 id="Picture_x0020_3"
src="cid:image002.gif@01CA19A6.A02D7680"
alt="http://www.glumac.com/consider.gif"></span><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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