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<p class="MsoNormal">Just to share one more fundamental approach that requires a little extra setup, but offers some unique flexibilities that I’ve had repeat success with:
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Considering various limitations/restrictions inherent to DOE2 heat pump chillers, you can also effectively model (real-world) 2-pipe system in the energy model as a 4 pipe system. You would define the exact same pump/loop properties for
both the heating and cooling loops, then just make an effort to schedule each loop in a fashion that will prevent simultaneous operation.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Commonly when emulating 2-pipe systems, a set of snap schedules is an “ideal” control approach which is fine for getting through prescriptive/performance modeling efforts, however out in the real-world I have much more commonly encountered
manual (not automated by temperature) heating/cooling season switchover processes. Those are more accurately modeled with calendar schedules to align with typical/historical changeover dates, and that may be easier than snap schedules ultimately if you need
to define a “no heat no cool” period where neither boilers or chillers are operated.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Sorry for digressing! Back to the modeling approach: You can alternatively/additionally schedule when heating/cooling is available from the airside systems). From there it can sometimes be easier to define waterside equipment effectively
matching your real-world machine’s cooling & heating performance characteristics, separately.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This can all be a little more work than necessary for a given model/application, so I wouldn’t call it my “Plan A,” but could be a useful strategy to keep in mind and try out sometime if you have the opportunity.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">~Nick<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E. (US), BEMP</span></b><b><span style="font-family:"Arial",sans-serif;color:#3A7A46"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b>From:</b> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Brian Fountain via Equest-users<br>
<b>Sent:</b> Monday, January 23, 2023 2:06 AM<br>
<b>To:</b> Omer Moltay <omoltay@mimtarch.com><br>
<b>Cc:</b> Haberl, Jeff via Equest-users <equest-users@lists.onebuilding.org><br>
<b>Subject:</b> Re: [Equest-users] 2 Pipe Loops<o:p></o:p></p>
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<p><span style="color:red">[External email: Use caution with links and attachments]</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Omer<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">It seems to me that a loop-to-loop heat pump would better represent the system you are describing. It can feed hot water and chilled water loops rather than requiring a 2-pipe loop to dictate whether it is
in heating or cooling mode. Further, it can respond to the higher of the heating or cooling loop loads.<o:p></o:p></p>
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<p class="MsoNormal">Brian<o:p></o:p></p>
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<p class="MsoNormal">On Jan 22, 2023, at 9:58 AM, Omer Moltay via Equest-users <<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>> wrote:
<o:p></o:p></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<p>Dear All,<o:p></o:p></p>
<p>I am using two different 2 pipe loops for both HW and CHW produced by a ground coupled heat pump. Each of these loops is only in heating or cooling mode throughout the year. This is necessary as eQuest requires a 2 pipe loop for modeling a chiller heat pump
(although the CHW 2 pipe loop might also have been a cooling loop - but the result does not change).<o:p></o:p></p>
<p>Attached is a simple model that features what I have just described. The simulation run always gives the error that there is zero design flow in the loops, whatever I try (I have tried using secondary loops as well but did not work).<o:p></o:p></p>
<p>It would help me a lot if anyone could point out what could be wrong with this set-up?<o:p></o:p></p>
<p>Best,<o:p></o:p></p>
<p>Ömer Moltay, LEED AP BD+C, ASHRAE BEMP, ASHRAE CPMP <br>
Mimta EcoYapi, LEED Proven Provider <br>
Hekimsuyu Cad. 559. Sk. <br>
No:39 34255 Kucukkoy Istanbul Turkey <br>
Tel: 90-212-617-2296 <br>
Fax: 90-212-617-2297 <br>
Mobile: 90-533-957-1394 <br>
<a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.eco-yapi.com%2F&data=05%7C01%7CNicholas.Caton%40se.com%7C9ff45d8e280243545a0b08dafc9b5bce%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C638100041442756574%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=Qfbszh4q0K%2B7yxgivrR1Oy%2BmGDRRLjJmFK8%2BoGtecsg%3D&reserved=0" target="_blank">www.eco-yapi.com</a>
<o:p></o:p></p>
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<pre><br>Equest-users mailing list<br><a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.onebuilding.org%2Flistinfo.cgi%2Fequest-users-onebuilding.org&data=05%7C01%7CNicholas.Caton%40se.com%7C9ff45d8e280243545a0b08dafc9b5bce%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C638100041442756574%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=vrqyR3tgW7b5hAuj40C%2BxnI6dFhqF3BfVEGYSrt8qXM%3D&reserved=0">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></pre>
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