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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-family:"Calibri","sans-serif";color:#1F497D'>Sounds like the same 2 curve names I received from Trane when I asked for them recently – I did a Google search and found something James Hirsch Associates prepared for California at:<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.energy.ca.gov/title24/2005standards/archive/documents/measures/20/20_2002-03_CONDENSER.PDF">http://www.energy.ca.gov/title24/2005standards/archive/documents/measures/20/20_2002-03_CONDENSER.PDF</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>The text that made me assume that “condenser relief” was synonymous with “condenser reset” was contained on the first page within the “Description” section.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'> </span><b><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>Jeremy R. Poling, PE, LEED AP+BDC</span></b><span style='font-family:"Calibri","sans-serif";color:#1F497D'><br><br></span><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><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>Paul Diglio<br><b>Sent:</b> Monday, March 14, 2011 10:32 AM<br><b>To:</b> James Hansen; equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] which chiller curve(s) to modify?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-size:10.0pt'>Jim:<br><br>What do you mean by condenser relief?<br><br>Paul Diglio<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p><div><div class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><hr size=1 width="100%" align=center></span></div><p class=MsoNormal style='margin-bottom:12.0pt'><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"'> James Hansen <JHANSEN@ghtltd.com><br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Sent:</b> Mon, March 14, 2011 11:23:04 AM<br><b>Subject:</b> [Equest-users] which chiller curve(s) to modify?</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p><div><p class=MsoNormal>I know there was a recent discussion about chiller curves, but I can’t seem to access <a href="http://www.gard.com" target="_blank">www.gard.com</a> right now, so I thought would send out this email since I don’t remember it being discussed.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>I have two different curves for a standard water-cooled 200-ton screw chiller:<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoListParagraph>1)<span style='font-size:7.0pt;font-family:"Times New Roman","serif"'> </span>EIR based on PLR, but with AHRI condenser relief<o:p></o:p></p><p class=MsoListParagraph>2)<span style='font-size:7.0pt;font-family:"Times New Roman","serif"'> </span>EIR based on PLR, with NO condenser relief, and varying return chilled water temperature (from design at 100% to only about a 2 degree delta between supply and return at the 20% load range)<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Which curves should I modify with custom curves? I am so confused.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>The f(PLR) curve says it should be the EIR vs PLR with no condenser water reset. That one’s the easy one. I already set that one up, and it’s about $1000 cheaper a year than the default curve, so I know it’s at least in the right range.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>But the f(t evap leaving, t cond entering) says it’s a quadratic curve, but since there are two variables, shouldn’t it be bi-quadratic like the Cooling Capacity curve as a function of entering CW and leaving CHW?<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>When you all get chiller PLR curves with condenser relief, which curve(s) do you modify and to what extent?<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Thanks!<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><b><span style='color:teal'>GHT Limited<br></span><span style='color:black'>James Hansen, PE, LEED AP</span></b><o:p></o:p></p><p class=MsoNormal><b><span style='font-size:10.0pt;color:black'>Senior Associate</span></b><o:p></o:p></p><p class=MsoNormal><span style='font-size:7.5pt;color:black'>1010 N. Glebe Rd, Suite 200</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:7.5pt;color:black'>Arlington, VA 22201-4749</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:7.5pt;color:black'>703-338-5754 (Cell)</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:7.5pt;color:black'>703-243-1200 (Office)</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:7.5pt;color:black'>703-276-1376 (Fax)</span><o:p></o:p></p><p class=MsoNormal><span style='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><b><span style='color:#31849B'> </span></b><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p></div></div></div></div></div></body></html>