Thanks David for taking out time to reply, will go through your suggestions and follow up for any further queries.<br><br>On Thursday, March 25, 2021, David Eldridge <<a href="mailto:DEldridge@grummanbutkus.com">DEldridge@grummanbutkus.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="#0563C1" vlink="#954F72" style="word-wrap:break-word">
<div>
<p class="MsoNormal">Here’s another paper on the topic, the paper is old the methods should hold up if you make your own spreadsheet.<u></u><u></u></p>
<p class="MsoNormal"><a href="http://www.taylor-engineering.com/wp-content/uploads/2020/04/ASHRAE_Symposium_AC-02-9-1_Electric_Chiller_Model.pdf" target="_blank">Tools and Techniques to Calibrate Electric Chiller Component Models (taylor-engineering.com)</a><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">David<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b><span style="color:#1f497d">David S. Eldridge, Jr.</span></b><b><span style="color:#244061">, P</span></b><b><span style="color:#1f497d">.</span></b><b><span style="color:#244061">E</span></b><b><span style="color:#1f497d">.</span></b><b><span style="color:#244061">,
BEMP, BEAP, HBDP, GGA</span></b><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">Associate</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:4.0pt;color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#365f91">Direct: (847) 316-92</span><span style="color:#1f497d">24</span><span style="color:#365f91"> | Mobile: (</span><span style="color:#1f497d">773</span><span style="color:#365f91">)
</span><span style="color:#1f497d">490</span><span style="color:#365f91">-</span><span style="color:#1f497d">5038</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><b><span style="color:#244061">Grumman/Butkus Associates</span></b><span style="color:gray">
</span><span style="color:#365f91">| <a href="https://www.google.com/maps/search/820+Davis+Street,+Suite+300+%7C+Evanston,+IL+60201?entry=gmail&source=g">820 Davis Street, Suite 300 | Evanston, IL 60201</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:gray">Energy Efficiency Consultants and Sustainable Design Engineers</span><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u><span style="font-size:9.0pt;color:gray"><a href="http://grummanbutkus.com/" target="_blank"><span style="color:gray">grummanbutkus.com</span></a></span></u><span style="font-size:9.0pt;color:gray"> |
<u><a href="http://grummanbutkus.com/blog" target="_blank"><span style="color:gray">Blog</span></a></u> |
<u><a href="https://www.facebook.com/pages/GrummanButkus-Associates/1385285015032526" target="_blank"><span style="color:gray">Facebook</span></a></u> |
<u><a href="https://twitter.com/grummanbutkus" target="_blank"><span style="color:gray">Twitter</span></a><u></u><u></u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.<wbr>onebuilding.org</a>>
<b>On Behalf Of </b>Rushi Quest via Equest-users<br>
<b>Sent:</b> Wednesday, March 24, 2021 12:36 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.<wbr>onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Baseline chiller unusual part load COP<u></u><u></u></p>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Hi everyone,<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">I am working on a office building project (e-quest 3.65-7175) in which baseline case is modelled following ASHRAE-90.1-2010 standard.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Two centrifugal type chillers of 690TR each are assigned to the chilled water loop with full load COP value entered as 6.16 in chiller input tabs.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">As I was analysing the hourly reports for chiller, it was observed that chiller COP values (based on corrected EIR values in hourly report) are quite high ranging from 11 to around 25 at part load values in the range of 50% to 0.1%.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">This seems very unusual considering that as per chiller manufacturer part load datapoints the part load COP values starts decreasing below 35-30% part load; whereas using e-quest default chiller curves, the chiller COP value seems to go
on increasing even at lower part load values.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Has anyone observed this before, or am I going wrong somewhere?<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Also due to above issue, when part load data points provided by chiller manufacturer are entered in proposed model and default e-quest performance curves are used in baseline model, expected energy savings under space cooling consumption
are not achieved during comparison.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">I have attached screen-shots showing e-quest default curve coefficients (EIR-FT, EIR,-fPLR & Cap-FT curves) for centrifugal chiller and a sample manufacturer's part load details for reference.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Do I need to change the default curve coefficients from e-quest to get more accurate results? If so, please kindly let me know the changes to be made or the process for finding correct part load curve coefficients for chiller.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Thanks in advance.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
</div>
</blockquote>