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<p class="MsoNormal">For example, if you are using the default chiller water efficiency of 4.4 COP. You need to reduce that efficiency by 5% to account for piping loses. DES cooling eff.: 4.4 * 0.95 = 4.18 COP.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Christopher R Jones, P.Eng.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">T+ 1 416-644-0252<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><img width="60" height="29" style="width:.625in;height:.302in" id="_x0031_cc2331b-d8c3-424e-81de-2b17716d444e.png_x003f_ver_x003d_1495657656000" src="cid:image002.png@01D42FC8.6F990150"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>From:</b> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>equest user via Equest-users<br>
<b>Sent:</b> Thursday, August 09, 2018 5:56 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Modelling losses in chillers<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:#254061">Hola Modelers,</span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:#254061"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:#254061">Its time that I need some help!!</span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:#254061">My building includes chilled water district cooling system in which I have received a review comment which is as follows:</span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:#254061"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><i><span style="font-size:12.0pt;color:#254061">“If following Option 2 of the district thermal guidelines the Proposed model must reflect a virtual plant with the same average efficiencies of the entire upstream
district energy system based on actual loading (average efficiencies can be determined using either the Monitoring or Modeling methods described in Appendix C). Alternatively, the default plant efficiency values outlined in Section 2.4.1.2.3 of the guidelines
(4.4 COP for DES cooling plant and 70% for DES heating plant) may be may be used to reflect the district energy plants in the Proposed model</span></i><i><span style="font-size:12.0pt;color:red">. In addition, thermal distribution losses must be accounted
for in the Proposed model based on the losses determined in the actual design or the default values outlined in Section 2.4.1.2.3 of the guidelines may be used (5% for chilled water district cooling, 10% for hot water district heating, 15% for closed steam
loop, or 25% for open steam loop)</span></i><i><span style="font-size:12.0pt;color:#254061">”</span></i><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><i><span style="font-size:12.0pt;color:red"> </span></i><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:#254061">Can anyone help me on how should I account 5 % losses mentioned in the comment (highlighted in red)?? </span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:red"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:#254061">Waiting for the reply.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:#254061"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:#254061">Thanks</span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;color:#254061">Vishal</span><o:p></o:p></p>
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