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<p class="MsoNormal">“Secondary pump” to me infers a circulating pump on a secondary loop, as opposed to primary equipment or primary loop pumps.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Further recommended reading:<o:p></o:p></p>
<p class="MsoNormal"><a href="mk:@MSITStore:C:\Users\sesa399002\Documents\eQUEST%203-65-7175%20Data\Help\DOE23\DOE-2.chm::/Docs/volume3topics.htm">Volume 3: Topics</a><span class="d2hbreadcrumbslinkseparator"> >
</span><a href="mk:@MSITStore:C:\Users\sesa399002\Documents\eQUEST%203-65-7175%20Data\Help\DOE23\DOE-2.chm::/Docs/centralplantcomponents1.htm">Central Plant Components</a> > CIRCULATION-LOOP<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">“Riding the pump curve” infers different things depending on context you haven’t provided yet<o:p></o:p></p>
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<span style="color:windowtext">If flow is supposed to be <b>constant</b>, “riding the pump curve” simply means the pump’s performance and power input will be read off of the associated pump curves based on the (static) head/flow requirements. Power input shouldn’t
vary much in your simulation while operating (cycling aside), though in the real world you can find issues including blocked strainers, stuck/broken valves, corroding coils/piping, and other system changes over time resulting in long term variances from the
designed or as-constructed head pressure.</span><span style="font-family:"Arial",sans-serif"><o:p></o:p></span></li><li class="MsoListParagraph" style="color:#3A7A46;margin-left:0in;mso-list:l0 level1 lfo1">
<span style="color:windowtext">If flow is supposed to be<b> variable</b>, then as flow varies the pump will maintain a single speed (rpm) and draws more/less power as the pressure/head requirement varies further from its design selection point (where the system
curve intersects with the pump curve). There are limits to this degree of variable flow operation with respect to a given pump/impeller intended for single speed operation – some pumps by design can work with a larger range of duty conditions, and other cannot.
If flow ranges too far off of the selection you end up with unstable operation and cavitation (vacuum pockets creating boiling fluid – sounds like you’re pumping gravel) – not good for system longevity, and the efficiency of the pump can tank to boot! … This
however is why we have and employ options including VSD’s, multi-speed pumps, and staging between multiple pumps.
</span><span style="font-family:"Arial",sans-serif"><o:p></o:p></span></li><li class="MsoListParagraph" style="color:#3A7A46;margin-left:0in;mso-list:l0 level1 lfo1">
<span style="color:windowtext">For either case, you can achieve “riding the curve” in eQuest/doe2 by specifying ONE-SPEED-PUMP for the pump’s CAP-CTRL. Pay mind to the line mentioning that you won’t achieve variable flow operation in the loop if you don’t
have one or more 2-way valves specified on the airside tab:</span><span style="font-family:"Arial",sans-serif"><o:p></o:p></span></li></ul>
<p class="MsoListParagraph"><img border="0" width="859" height="364" style="width:8.9479in;height:3.7916in" id="Picture_x0020_3" src="cid:image003.png@01D546FD.D00A3DE0"><span style="font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">I hope this is helpful!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">~Nick<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#3A7A46"><o:p> </o:p></span></p>
<p class="MsoNormal"><img border="0" width="726" height="9" style="width:7.5625in;height:.0937in" id="Picture_x0020_1" src="cid:image001.png@01D546FC.D8016290" alt="cid:image005.png@01D515A3.47EDD880"><span style="font-family:"Arial",sans-serif;color:#3A7A46"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Senior Energy Engineer</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Regional Energy Engineering Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy Performance Contracting
</span><span style="font-size:9.0pt;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#57B069">D </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#57B069">M </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#57B069">F </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#57B069">E </span><span style="font-size:9.0pt;color:#1F497D">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469">913 . 564 . 6361<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469">785 . 410 . 3317<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469">913 . 564 . 6380<o:p></o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"><a href="mailto:nicholas.caton@se.com"><span style="font-family:"Calibri",sans-serif;color:#626469">nicholas.caton@se.com</span></a></span></u><span style="font-size:9.0pt;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469">15200 Santa Fe Trail Drive<br>
Suite 204<br>
Lenexa, KS 66219<br>
United States</span><span style="font-size:9.0pt;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-line-height-alt:4.0pt"><span style="color:#3A7A46"><img border="0" width="722" height="49" style="width:7.5208in;height:.5104in" id="Picture_x0020_2" src="cid:image002.png@01D546FC.D8016290" alt="cid:image006.png@01D515A3.47EDD880"><o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Sambhav Tiwari via Equest-users<br>
<b>Sent:</b> Tuesday, July 30, 2019 4:21 AM<br>
<b>To:</b> equest-users <equest-users@lists.onebuilding.org><br>
<b>Subject:</b> [Equest-users] (no subject)<o:p></o:p></p>
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<p> <o:p></o:p></p>
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<p class="MsoNormal">Dear Users, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">What is meaning of " secondary pump riding pump curve and how to model it.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Regards<o:p></o:p></p>
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<p class="MsoNormal">Sambhav<o:p></o:p></p>
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<p class="MsoNormal"><br>
______________________________________________________________________<br>
This email has been scanned by the Symantec Email Security.cloud service.<br>
______________________________________________________________________<o:p></o:p></p>
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