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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Most manufacturers will give you a “single chiller” performance curve for the two chillers in series. I typically just make custom chiller curves to represent series chillers as a single chiller. If a designer creates valving that allows water to NOT have to flow through both chillers during low load operation, this gets a little tricky, and I end up averaging the delta P across the chillers to represent partial operation thru both chillers and partial operation thru a single chiller. No easy way to do this.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:teal'>GHT Limited</span></b><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:teal'><br></span></b><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif"'><ns0:PersonName><span style='color:black'>James Hansen</span></ns0:PersonName></span></b><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>, PE, LEED AP<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Senior Associate</span></b><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:Street><ns0:address><span style='color:black'>1010 N. Glebe Rd, Suite 200</span></ns0:address></ns0:Street></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:place><ns0:City><span style='color:black'>Arlington</span></ns0:City><span style='color:black'>, </span><ns0:State><span style='color:black'>VA</span></ns0:State><span style='color:black'> </span><ns0:PostalCode><span style='color:black'>22201-4749</span></ns0:PostalCode></ns0:place></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-338-5754 (Cell)</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-243-1200 (Office)</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-276-1376 (Fax)</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:teal'><a href="http://www.ghtltd.com/"><span style='font-size:10.0pt'>www.ghtltd.com</span></a><o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#31849B'><o:p> </o:p></span></b></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Rob Hudson<br><b>Sent:</b> Friday, April 22, 2011 2:15 PM<br><b>To:</b> Pasha Korber-Gonzalez<br><b>Cc:</b> eQUEST Users List; Arunabha Sau<br><b>Subject:</b> Re: [Equest-users] Chillers in Series inputs<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I won't claim that this is correct whatsoever, but briefly looking at your set up, it is clear that the water isn't pulling extra load from the second chiller. I think you may want to set up a single chiller because I don't see a way to get the water to go through both chillers. You could also create your own custom curves so that you match the combined performance of the modeled chiller.<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Just a thought.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Rob<o:p></o:p></p><div><p class=MsoNormal>On Fri, Apr 22, 2011 at 1:55 PM, Pasha Korber-Gonzalez <<a href="mailto:pasha.pkconsulting@gmail.com">pasha.pkconsulting@gmail.com</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal>Hi,<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>I could use some guidance to make sure I'm assuming the correct inputs to set up chillers in series. This is the first time I'm trying to model this and I have it set up with a primary & secondary loop for a total delta T of 16 across 2 chillers. I'm getting a run error of the secondary loop having NO DESIGN FLOW/LOAD, but I'm not sure how to show that load on the secondary loop.....maybe I have the chillers listed backwards???<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Can anyone take a quick look at the setup in the Plant Module and let me know what I am missing on this? I couldn't find any info on chillers in series in the DOE-2 docs to guide me on the correct inputs and setup.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>.pd2 & inp files attached.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Thanks in advance for your keen eye and guidance on my model.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='color:#888888'>Pasha<o:p></o:p></span></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><br>_______________________________________________<br>Equest-users mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p></div><p class=MsoNormal><br><br><br>-- <br>Rob Hudson<o:p></o:p></p></div></div></body></html>