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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Note that Bill’s solution is for 2.3 where the loop type “well” has been removed as a requirement for the loop-to-loop heat pump … and has been removed
from the DOE-2.3 entirely.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none"> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Bill Bishop via Equest-users<br>
<b>Sent:</b> December 22, 2025 1:35 PM<br>
<b>To:</b> Jeff Ross-Bain <jeff@rbgb.com>; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Chilled Water Heat Pump Modeling<o:p></o:p></span></p>
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<p class="MsoNormal"><strong><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none">CAUTION: This message originated from outside Smith + Andersen</span></strong><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi Jeff,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">For the CW-LOOP of your LOOP-TO-LOOP-HP chiller(s), use a WLHP loop. Assuming your HP chiller is water-cooled, you then connect boilers and heat-rejection to the
loop. If the HP chiller is air-cooled, you can’t use the LOOP-TO-LOOP-HP type.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">You may choose to model the preheat and reheat coils as separate HW loops. If you model them as additional primary HW loops, you would serve them with the boilers
per the design. Or you can model secondary HW loops off of the LOOP-TO-LOOP-HP HW loop.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:8.0pt"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">William Bishop</span></b><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif">, PE, CEM, LEED AP, ASHRAE (BEMP,
BEAP, CDP)</span><span lang="EN-US"><br>
</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif">Associate Principal | Project Executive | Sustainability & Energy<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif">IMEG</span></b><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif"> | <b>formerly Pathfinder
</b>(585) 698-1956 | phone<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none"> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>>
<b>On Behalf Of </b>Jeff Ross-Bain via Equest-users<br>
<b>Sent:</b> Monday, December 22, 2025 9:19 AM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Chilled Water Heat Pump Modeling<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Dear eQUEST Brain Trust:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">I am trying to model a chilled water heat pump using the “loop to loop” approach and have reached a point where I know not where to go…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">The rules call for the heat pump condenser to be linked to a Lake/Well loop. The system also has boilers attached to the system preheat coil and to the zone reheat coils, in a sort of supplemental
format for when the HP chiller cannot meet set points.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">I can create all the loops, with associated pumps, yet the lake/well loop requires a heat source. I cannot determine how to do that (after hours and hours!), or if I am missing something.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Does anyone know of a procedure for modeling this situation (besides the eQUEST help pages)? I wonder if the boilers may be part of the issue.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Many thanks to everyone and wish you all the happiest of holidays.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Century Gothic",sans-serif;color:#006E78">Jeff Ross-Bain, PE, LEED Fellow, WELL AP, BCxP, BEMP, HBDP</span></b><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Century Gothic",sans-serif;color:#006E78;mso-ligatures:none"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053">President<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053">Atlanta: 404-220-8955<o:p></o:p></span></b></p>
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