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<p class="MsoNormal">I had e-mailed the posters off-list, but here is the reply in case it is useful to anyone else.<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I’m not sure that would work for determining when one chiller would be on as the load rises, and two chillers would be on as the load falls. The program still only makes the decision based on load without knowing
if the load was increasing or decreasing at any time unless that’s been added since I looked.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Also the pumping for one vs. two chillers might be important.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If the purpose of the study is to determine the optimal staging, I do think a spreadsheet might be more flexible for your scenario. Use eQUEST to provide the load and building temperature conditions at each hour,
and use your own logic to stage chillers and calculate the energy usage. This will be based on an ideal case of known conditions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">However with six chillers of two different types in the plant, the ability to model the proposed sequence is going to exceed the accuracy of the assumptions used to calculate the loads and system response. For
an Appendix G type analysis the eQUEST staging might suffice unless the two chiller types are very different, or unless this is an existing building with monitored chiller plant data that you are trying to match.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">David<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">(Also testing my new e-mail address ;)…old one will continue to forward though.)<span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;color:black"> </span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="color:#244061">Grumman/Butkus Associates</span></b><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Howe, Timothy<br>
<b>Sent:</b> Tuesday, May 08, 2012 10:29 AM<br>
<b>To:</b> Janne Kairento; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Chiller Staging<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue">Quick thought here. Why not create a custom set of chiller curves which directly models your different stages and associated chiller efficiencies and model as one
large chiller.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Timothy Howe, MS, LEED® AP BD+C</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><br>
Mechanical Engineer<br>
Stantec<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:Webdings;color:#008040">ü</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:blue"> </span><span style="font-size:10.0pt;font-family:"Arial Narrow","sans-serif";color:#008040">Please
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Janne Kairento<br>
<b>Sent:</b> Tuesday, May 08, 2012 11:26 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Chiller Staging<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have building with 6 chillers (2 different capacities) and I would like to model them with 14 stages of operation. How can I independently control the increment (add chiller) and decrement (stop lag chiller) of an individual chiller
stage. I was using equipment control, however, the saw tooth approach does not account for the overlap of plant stages. Thank you for your time.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:#0066CC">Janne Kairento LEED AP, EIT</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#0066CC">Designer</span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:#0066CC">B2Q Associates, Inc.</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#0066CC">146 Main Street</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#0066CC">North Andover, MA 01845</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#0066CC">Office: 978.208.0609 x209</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#0066CC"><a href="http://www.b2qassociates.com/">www.b2qassociates.com</a><o:p></o:p></span></p>
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