<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><p style="margin: 0;"><br></p><div style="margin: 0;">Hi Fiona,</div><div style="margin: 0;"><br></div><div style="margin: 0;">I kown that you mentioned.</div><div style="margin: 0;"><br></div><div style="margin: 0;">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 style="font-family: Calibri, sans-serif; font-size: 14.6667px;">water-cooled</span> chillers with 222 tons were modeled.And the cooling efficiency for the both chillers is 0.634 kW/ton.</div><div style="margin: 0;"><br></div><div style="margin: 0;">And why in CI project,I should model the chiller efficiency as 0.576kW/ton?</div><div style="margin: 0;"><br></div><div style="margin: 0;">The credit indicates that <span style="font-family: Calibri, sans-serif; font-size: 14.6667px;">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 </span><b style="font-family: Calibri, sans-serif; font-size: 14.6667px;">whole-building (Base building)</b><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;"> capacity,but not based on the Base building peak load!</span></div><div style="margin: 0;"><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;"><br></span></div><div style="margin: 0;"><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;">My understanding is shown as following£º</span></div><div style="margin: 0;"><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;"><br></span></div><div style="margin: 0;"><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;">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></div><div style="margin: 0;"><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;"><br></span></div><p style="margin: 0;"><br></p><div style="position:relative;zoom:1"></div><div id="divNeteaseMailCard"></div><p style="margin: 0;"><br></p><p>At 2020-11-18 11:07:30, "Xiang, Yun (Fiona)" <Fiona.Xiang@atkinsglobal.com> wrote:</p><blockquote id="isReplyContent" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">



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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi Yongqing,<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">If your project is CI project, the reviewer is right.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">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).<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="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">
</span><i><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:#58595B">LEED AP BD+C  WELL AP</span></i><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><br>
</span><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:#58595B">Senior Project Engineer</span><span style="font-size:11.0pt;font-family:"Arial",sans-serif">
<br>
</span><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:#58595B">Asia Pacific</span><span style="font-size:11.0pt;font-family:"Arial",sans-serif">
<br>
</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">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:#58595B">(86) 21 6080 2362</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">    
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:#58595B">(86) 180 1853 6552</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">    
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Unit 2204-2210, Ciro's Plaza, No.388 West Nanjing Road, Shanghai, China <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users <equest-users-bounces@lists.onebuilding.org>
<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 <equest-users@lists.onebuilding.org><br>
<b>Subject:</b> [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 class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">Hi,everyone<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:<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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<i><span lang="EN-US" 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 lang="EN-US" 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"><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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