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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><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">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 style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>EIR based on PLR, but with AHRI condenser relief<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>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='font-family:"Arial","sans-serif";color:teal'>GHT Limited<br></span></b><b><span style='font-family:"Arial","sans-serif"'><ns0:PersonName><span style='color:black'>James Hansen</span></ns0:PersonName></span></b><b><span style='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='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><o:p></o:p></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='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='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='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='color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:teal'><a href="http://www.ghtltd.com/"><span style='font-size:10.0pt;color:blue'>www.ghtltd.com</span></a><o:p></o:p></span></p><p class=MsoNormal><b><span style='color:#31849B'><o:p> </o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>