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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Yes – good point Brian about LAKE/WELL loops not supported in DOE-2.3. Note that you can still add a GROUND-LOOP-HX of TYPE: LAKE/WELL to a WLHP loop in DOE-2.3.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span 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 style="font-size:10.0pt;font-family:"Arial",sans-serif">William Bishop</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif">, PE, CEM, LEED AP, ASHRAE (BEMP, BEAP, CDP)</span><br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif">Associate Principal | Project Executive | Sustainability & Energy<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt"><a href="https://www.imegcorp.com/"><span style="color:windowtext;mso-ligatures:none;text-decoration:none"><img border="0" width="126" height="30" style="width:1.3125in;height:.3125in" id="Picture_x0020_325557504" src="cid:image001.png@01DC734D.CD9E1E40" alt="now IMEG"></span></a><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif">IMEG</span></b><span 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 style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none"> Brian Fountain <Brian.Fountain@sa-footprint.com>
<br>
<b>Sent:</b> Monday, December 22, 2025 2:08 PM<br>
<b>To:</b> Bill Bishop <William.J.Bishop@imegcorp.com>; Jeff Ross-Bain <jeff@rbgb.com><br>
<b>Cc:</b> 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"><o:p> </o:p></p>
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<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif">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>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none">From:</span></b><span 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>Bill Bishop via Equest-users<br>
<b>Sent:</b> December 22, 2025 1:35 PM<br>
<b>To:</b> Jeff Ross-Bain <<a href="mailto:jeff@rbgb.com">jeff@rbgb.com</a>>; <a href="mailto:equest-users@lists.onebuilding.org">
equest-users@lists.onebuilding.org</a><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"><span lang="EN-CA"><o:p> </o:p></span></p>
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<p class="MsoNormal"><strong><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none">CAUTION: This message originated from outside Smith + Andersen</span></strong><span 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 style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi Jeff,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span 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 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 style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none">From:</span></b><span 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"><o:p> </o:p></p>
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</span></strong><span style="font-size:10.0pt;color:black;background:#FFFF99;mso-ligatures:none">Treat links and attachments with caution.</span><span style="mso-ligatures:none"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Dear eQUEST Brain Trust:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span 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 style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span 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 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 style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span 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 style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span 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 style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span 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 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 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 style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span 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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