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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi Yongqing,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Based on the information that I¡¯ve seen, you are right. The total building load is used to determine type and quantity of chillers,
but the efficiency (COP or kW/ton) is based on the size of each chiller not the total building load. I would suggest requesting a call with reviewer to discuss (this is allowed). Sometimes they bring in other people who didn¡¯t do the review when you challenge
them on something like this. My guess is that the specific reviewer that provided this comment is mistaken and interpreted this wrong, but that if the GBCI Energy heads got involved that they would agree with you.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Good luck.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:13.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US">Alex Chapin</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US"> EIT, BEMP,
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Yongqing [mailto:zhaoyongqing1987@126.com]
<br>
<b>Sent:</b> Tuesday, November 17, 2020 11:25 PM<br>
<b>To:</b> equest-users <equest-users@lists.onebuilding.org><br>
<b>Subject:</b> Re: [Equest-users] LEED baseline chiller COP shoulbe determined by building peak load or single chiller capacity<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">Hi Fiona,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">I kown that you mentioned.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">The total capacity of my base building is 444 tons(data from energy model result for LEED CS).And in my enegy mode for LEED cs ,two </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">water-cooled</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"> chillers
with 222 tons were modeled.And the cooling efficiency for the both chillers is 0.634 kW/ton.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">And why in CI project,I should model the chiller efficiency as 0.576kW/ton?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">The credit indicates that </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">the Baseline Case water side equipment (i.e. chillers,
pumps, etc.) type, size and related controls such as COP, secondary pump control, etc., must be determined based on the <b>whole-building (Base building)</b> capacity,but not based on the Base building peak load!</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">My understanding is shown as following</span><span lang="ZH-CN" style="font-size:11.0pt;color:black">£º</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">For example, if my base building peak load is 400 tons,and my project peak load is 200 tons.We shoulde use the 400 tons to determined the number of chillers ,that
is 2 chillers.And then the capacity for each chiller is 200 tons.Finally according to Table 6.8.1C, the cooling efficiency of each chiller should be 0.637. </span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">At 2020-11-18 11:07:30, "Xiang, Yun (Fiona)" <<a href="mailto:Fiona.Xiang@atkinsglobal.com">Fiona.Xiang@atkinsglobal.com</a>> wrote:<o:p></o:p></span></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in" id="isReplyContent">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Hi Yongqing,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">If your project is CI project, the reviewer is right.
</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">For CI project, the Baseline Case water side equipment (i.e. chillers, pumps, etc.) type, size and related controls such as COP, secondary pump control, etc., must
be determined based on the <b>whole-building (Base building)</b> capacity, not only your project.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">For example, If the base building has total cooling capacity of 1000 tons, and your project only has cooling capacity of 100 tons. Then the Baseline case should
be modeled as two water-cooled centrifugal chillers with 0.576 kW/ton (500tons).</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:#00A2DB">Fiona Xiang</span><span style="font-size:11.0pt;font-family:"Arial",sans-serif">
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</span><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:#58595B">Energy & Sustainability / Engineering, Design & Project Management</span><span style="font-size:11.0pt;font-family:"Arial",sans-serif">
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>>
<b>On Behalf Of </b>Yongqing via Equest-users<br>
<b>Sent:</b> Wednesday, November 18, 2020 10:49<br>
<b>To:</b> equest-users <<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>><br>
<b>Subject:</b> [Equest-users] LEED baseline chiller COP shoulbe determined by building peak load or single chiller capacity</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">Hi,everyone</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">Recently, I was working on a LEED project,And the reviewer gave below comments:</span><span style="color:black"><o:p></o:p></span></p>
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<i><span style="font-size:7.0pt;font-family:"Arial",sans-serif;color:#464748">The MEPC Water-Side HVAC tab indicates that the Baseline Case has been modeled with the two-water cooled centrifugal chillers with each chiller cooling efficiency - kW per ton of
0.634 (full load), which appears to be inappropriate. Note that the Baseline Case water side equipment (i.e. chillers, pumps, etc.) type, size and related controls such as COP, secondary pump control, etc., must be determined based on the whole-building capacity.
Based on the base building information provided, it is likely that the Baseline Case should be modeled with two water-cooled centrifugal chillers per ASHRAE 90.1-2010 Table G<a href="https://urldefense.com/v3/__http:/3.1.3.7__;!!OepYZ6Q!sfr3WuMPL4_O2ncZ60QOq9V2x-x4GqZUWFyin9fICi_fyB99XjcgcktttHWe-RBPvLs$">3.1.3.7</a>
with each chiller cooling efficiency kW per ton of 0.576 (full load) and 0.549 (part load; if following path A).</span></i><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<i><span style="font-size:7.0pt;font-family:"Arial",sans-serif;color:#464748">Update the Baseline Case energy model and ensure that the Baseline Case chiller type and associated controls are modeled following the requirements of ASHRAE 90.1-2010 Appendix G
(based on the base building peak load).</span></i><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">He(She) said LEED baseline chiller cop shoulde be based on building peak load,rather than single chiller capacity.For example,two chillers were modeled in my baseline case,and the capacity
for each chiller is 160tons,and I use the capacity of 160tons to determine the COP, kW per ton of 0.634.And according to comments, I should determined the COP based on 320 tons,that is kW per ton of 0.576.<o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">Which is right?<o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">Thank you!<o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">Yongqing<o:p></o:p></span></p>
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