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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><pre>Dana,<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>What solution did you end up using to model the Multistack heat pump chiller coupled to a vertical bore field in eQuest?<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Any pointers would be greatly appreciated.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Thanks,<o:p></o:p></pre><pre>Steven<o:p></o:p></pre><pre><o:p> </o:p></pre><p class=MsoNormal><span style='font-family:"Bookman Old Style","serif"'>Steven Savich, LEED AP</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Bookman Old Style","serif"'>Systems West Engineers</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Bookman Old Style","serif"'>411 High Street</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Bookman Old Style","serif"'>Eugene, OR 97401-2427</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Bookman Old Style","serif"'>(541) 342-7210</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Bookman Old Style","serif"'>(541) 342-7220 (fax)</span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><pre><o:p> </o:p></pre><pre>Has anyone had any luck modeling a Multistack<o:p></o:p></pre><pre>(<a href="http://www.multistack.com/">http://www.multistack.com/</a>) unit in eQUEST?<o:p></o:p></pre><pre><o:p> </o:p></pre><pre> <o:p></o:p></pre><pre><o:p> </o:p></pre><pre>We have a project that uses a Multistack unit to provide hot and chilled<o:p></o:p></pre><pre>water to a project and is coupled to a vertical bore field. eQUEST does<o:p></o:p></pre><pre>not have the capability to model system directly, so I have been trying<o:p></o:p></pre><pre>to look into other methods, all which are falling short. So far I have<o:p></o:p></pre><pre>tried:<o:p></o:p></pre><pre><o:p> </o:p></pre><pre> <o:p></o:p></pre><pre><o:p> </o:p></pre><pre>* Using the "Loop-to-Loop Heat Pump" chiller; however, this<o:p></o:p></pre><pre>system does not work like the Multistack, as the Multistack does not<o:p></o:p></pre><pre>have internal heat exchange, has multiple compressor stages which are<o:p></o:p></pre><pre>all piped in parallel with the condenser water, and can only be<o:p></o:p></pre><pre>connected to a Lake/Well loop.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>* Using a separate chilled water loop and hot water loop, each<o:p></o:p></pre><pre>of which are connected to a WLHP loop with a vertical bore HX. This<o:p></o:p></pre><pre>would be perfect, as I can put as many chillers and boilers on the loops<o:p></o:p></pre><pre>as there are stages in the Multistack; however, eQUEST does not have a<o:p></o:p></pre><pre>heat-pump boiler, so the boiler cannot be connected to the vertical bore<o:p></o:p></pre><pre>field.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>* Using a dummy space/zone/system connected to a dummy heat<o:p></o:p></pre><pre>recovery chiller. The chiller would then reject heat to the hot water<o:p></o:p></pre><pre>loop that supplies the rest of the building. This would work, however<o:p></o:p></pre><pre>the chiller demand is driven by the cooling load of the dummy system and<o:p></o:p></pre><pre>it is impossible to create a dummy cooling load that would exactly match<o:p></o:p></pre><pre>the heating load required by the hot water loop.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>* And finally, using a domestic hot water loop because the<o:p></o:p></pre><pre>boiler type can be set to "heat pump", however, the heat cannot be<o:p></o:p></pre><pre>rejected to a condenser water loop.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre> <o:p></o:p></pre><pre><o:p> </o:p></pre><pre>So I guess the question I am asking is has anyone either successfully<o:p></o:p></pre><pre>modeled the Multistack unit OR modeled a heat pump boiler?<o:p></o:p></pre><pre><o:p> </o:p></pre><pre> <o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Thanks in advance.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre> <o:p></o:p></pre><pre><o:p> </o:p></pre><pre>-Dana<o:p></o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>Dana Troy<o:p></o:p></pre><pre>Energy Analyst<o:p></o:p></pre><pre>LEED(r) Accredited Professional<o:p></o:p></pre><pre><o:p> </o:p></pre><pre> <<a href="http://www.glumac.com/">http://www.glumac.com/</a>> <o:p></o:p></pre><pre><o:p> </o:p></pre><pre>________________________________<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>320 SW Washington, Suite 200<o:p></o:p></pre><pre>Portland, OR 97204-2640<o:p></o:p></pre><pre>T. 503.227.5280 F. 503.274.7674<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Thinking. Inside the building.<o:p></o:p></pre><pre>www.glumac.com <<a href="http://www.glumac.com/">http://www.glumac.com/</a>> <span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></pre></div></body></html>