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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><h5><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;font-weight:normal'>The keyword</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> “SERIES-SETPT-RAT</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;font-weight:normal'>“ to setup chillers in series is still listed as future in the help files. <o:p></o:p></span></h5><h5><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;font-weight:normal'>Could that be why you’re running into trouble? <o:p></o:p></span></h5><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>Anthony Hardman, PE<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>LEED AP BD&C</span></b><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#0F243E'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>Building Performance Analyst<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#00B050'>THE GREEN ENGINEER, LLP</span></b><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#00B050'><o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#00B050'>Sustainable Design Consulting – Energy Modeling – LEED Project Management </span></b><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:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>50 Beharrell St<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>Concord, MA 01742<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>O: 978/610-2801<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>C: 720/840-7862<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'><a href="http://www.GreenEngineer.com"><span style='color:#0F243E;text-decoration:none'>www.GreenEngineer.com</span></a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>www.linkedin.com/in/ahardman81<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'>http://twitter.com/#!/a_Hardman<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#0F243E'><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: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>Pasha Korber-Gonzalez<br><b>Sent:</b> Friday, April 22, 2011 2:04 PM<br><b>To:</b> James Hansen<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><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Thanks Rob & James for your prompt input to my dilemma....after I sent the email to the list, I went back in my plants to try and make sense why the secondary wasn't seeing a load--so for a random test I switched the assignement of the two chillers (just reversed which loops they are on.) and then ran the sim without errors. That was the good news. I don't have my head around the logic of why that worked on the first try, but maybe I was having some dislexia-input moments and spec'd my chiller conditions backwards (i.e. high chiller & low chiller in the series).<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Since it has ran I noticed an immediate reduction in chiller energy use, but I haven't yet verified if the reduction is realistic and if there are any other QC error type things to verify that this approach is indeed modeling the chiller temps in series. I don't think I will mess with custom chiller curves at this point because this project model is only SD. Therefore I won't be held to any compliance reviews and strict performance results...at least not at this point in time.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>I'll try to send feedback when I can verify that this is a valid input option for chillers in series, or if it holds no water at all...<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Cheers,<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Pasha<o:p></o:p></p></div><div><p class=MsoNormal>On Fri, Apr 22, 2011 at 12:18 PM, James Hansen <<a href="mailto:JHANSEN@ghtltd.com">JHANSEN@ghtltd.com</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;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.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:11.0pt;color:teal'>GHT Limited<br></span></b><b><span style='font-size:11.0pt;color:black'>James Hansen, PE, LEED AP</span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;color:black'>Senior Associate</span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:7.5pt;color:black'>1010 N. Glebe Rd, Suite 200</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:7.5pt;color:black'>Arlington, VA 22201-4749</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:7.5pt;color:black'><a href="tel:703-338-5754" target="_blank">703-338-5754</a> (Cell)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:7.5pt;color:black'><a href="tel:703-243-1200" target="_blank">703-243-1200</a> (Office)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:7.5pt;color:black'><a href="tel:703-276-1376" target="_blank">703-276-1376</a> (Fax)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:teal'><a href="http://www.ghtltd.com/" target="_blank"><span style='font-size:10.0pt'>www.ghtltd.com</span></a></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:11.0pt;color:#31849B'> </span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <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</span><o:p></o:p></p></div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>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 style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Just a thought.<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>Rob<o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On Fri, Apr 22, 2011 at 1:55 PM, Pasha Korber-Gonzalez <<a href="mailto:pasha.pkconsulting@gmail.com" target="_blank">pasha.pkconsulting@gmail.com</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi,<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>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 style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>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 style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>.pd2 & inp files attached.<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks in advance for your keen eye and guidance on my model.<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='color:#888888'>Pasha</span><o:p></o:p></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><br>_______________________________________________<br>Equest-users mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">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" target="_blank">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><br><br><br>-- <br>Rob Hudson<o:p></o:p></p></div></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>