<html><head></head><body style="background-color: rgb(255, 255, 255); line-height: initial;"> <div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">DOE-2.3 (eQUEST 3.70) does serial chillers. DOE-2.2 does not and as you observed the WSE will only work when it can take all the load. Have not tried. The DOE-2.3 WSE in series.</div> <div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br style="display:initial"></div> <div style="font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"></div> <table width="100%" style="background-color:white;border-spacing:0px;"> <tbody><tr><td colspan="2" style="font-size: initial; text-align: initial; background-color: rgb(255, 255, 255);"> <div style="border-style: solid none none; border-top-color: rgb(181, 196, 223); border-top-width: 1pt; padding: 3pt 0in 0in; font-family: Tahoma, 'BB Alpha Sans', 'Slate Pro'; font-size: 10pt;"> <div><b>From: </b>jordan jackson</div><div><b>Sent: </b>Wednesday, April 8, 2015 6:31 PM</div><div><b>To: </b>Michael Busman; equest-users@lists.onebuilding.org</div><div><b>Subject: </b>Re: [Equest-users] Centrifugal Chiller Curves</div></div></td></tr></tbody></table><div style="border-style: solid none none; border-top-color: rgb(186, 188, 209); border-top-width: 1pt; font-size: initial; text-align: initial; background-color: rgb(255, 255, 255);"></div><br><div id="_originalContent" style=""><div dir="ltr"><div>Michael, </div><div> </div><div>Thanks for the spreadsheet. That is definitely more elaborate than the one I put together. </div><div> </div><div>I was able to successfully model air-cooled screws using the spreadsheet I attached, but the issue I'm running into with the water-cooled centrifugals is that the capacity provided by the rep does not change as a result of entering condenser water temperature. KW changes, but tonnage does not. This creates an unrealistic curve for CAPFT and EIRFT. </div><div> </div><div>I'm at the mercy of the reps to provide this data and so far I have struck out. I was just curious if there was something I'm missing. Does something need to be held constant that will allow the capacity to change based on entering condenser water temperature and leaving chilled water temperature?</div><div> </div><div>On a similarly frustrating note... I'm trying to come up with a workaround to model series chillers in eQuest with free cooling on the upstream chiller. From reading the DOE manual it seems waterside economizer won't do what I need it to since I can't be in WSE and supplementing with the downstream chiller. I considered combining performance of the two chillers into one machine, but I haven't totally figured out how that will work. </div><div> </div><div>Any ideas are welcome. </div><div> </div><div>Thanks, </div><div> </div><div>Jordan Jackson.</div><div> </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Apr 7, 2015 at 8:44 AM, Michael Busman <span dir="ltr"><<a href="mailto:mbusman@opterraenergy.com" target="_blank">mbusman@opterraenergy.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt">Jordan,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt">Many, many years ago I used to do a lot of modeling in VisualDOE. I don’t do much in eQUEST or other simulation program anymore.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt">Anyway, I’ve attached a spreadsheet I put together way back when that is based on calculation methodology that was published by Pacific Gas & Electric. If you
look through the tabs you’ll see that I have some sample data that is used to calculate the curve coefficients. Originally it was based on a constant speed chiller, however, a few years ago I added a tab for a variable speed chiller.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt">Don’t expect the manufacturers’ reps to produce the curves for you but they should be able to generate the data you need. Key to this for reasons I don’t recall
is that the reps need to generate at least 10 data points of full load data at different chilled and condenser water temperatures in order to map the chiller. You will also need several part load data points at different water temps also. If you give the
reps the blank data sheet they should be able to run their software to generate the data you need.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt">Browse through the spreadsheet tabs and hopefully it will make sense to you. Any questions, I’ll do my best to answer you, however, please remember that it’s
been a long time since I’ve developed custom curves.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt">My best,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt">Mike<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt">Mike Busman, C.E.M.<u></u><u></u></span></b></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:10pt">Lead Project Engineer<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt"><u></u> <u></u></span></p>
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<p class="MsoNormal"><span style="color:rgb(31,73,125);font-family:"Calibri",sans-serif;font-size:11pt"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;font-size:11pt">From:</span></b><span style="font-family:"Calibri",sans-serif;font-size:11pt"> Equest-users [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>jordan jackson<br>
<b>Sent:</b> Monday, April 06, 2015 3:55 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Centrifugal Chiller Curves<u></u><u></u></span></p><div><div class="h5">
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<p class="MsoNormal">I have been using eQuest to evaluate chiller performance for retrofit projects. I have not had a problem modeling air-cooled, but I can't seem to get the data from the reps that I would like for water-cooled centrifugal projects. I have
settled on using standard curves for CAPFT and EIRFT and using a cubic curve with coefficients created through a curve fit in excel for EIRFPLR.
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<p class="MsoNormal">The manufacturers reps aren't able to produce a capacity or EIR curve as a function of temperature (entering condenser water temp). Has this been everyone's experience with this.
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<p class="MsoNormal">I'm attaching the excel file I created to calculate all of this.
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<p class="MsoNormal">Any feedback is appreciated. I'm just concerned about the data I'm reporting to the client without touching those curves.
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<p class="MsoNormal">Thanks, <u></u><u></u></p>
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<p class="MsoNormal">Jordan Jackson. <u></u><u></u></p>
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