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<P CLASS="641222e3-2192-4970-a597-448ed82b4871"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>My general rule of thumb is that if I want to show a quick comparison of standard technology, for example variable speed chiller vs constant speed chiller, or the chiller is basically a place holder in the model and not important for whatever I am looking at, or I can’t get the info from the manufacturer, I use default curves. If I want to compare a turbocore machine vs variable speed screw vs variable speed centrifugal, or Carrier model XXX vs York model XXX, I use custom curves. If you want to use custom curves and haven’t done it before, I would recommend downloading the chiller curve document written by Steve Gates and my spreadsheet from the following link:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="http://www.esimforums.com/equest/viewtopic.php?f=13&t=116&start=0&view=viewpoll">http://www.esimforums.com/equest/viewtopic.php?f=13&t=116&start=0&view=viewpoll</a><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Jeremy<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Myriad Web Pro";color:gray'>___________________________________________</span></b><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#5F5F5F'>Jeremy McClanathan</span></b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:gray'>,</span><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray'> P.E., BEMP, HFDP,</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:gray'> </span><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray'>LEED<sup>®</sup> AP BD+C </span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='line-height:9.0pt'><b><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:#5F5F5F'><img alt="CDi_Engineers_logo_color.jpg" border=0 height=15 id="Picture_x0020_8" src="cid:image001.jpg@01CC79E5.8B306CA0" width=98></span></b><b><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:olive'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray'>4200 194th St SW, Ste 200, Lynnwood, WA 98036</span><b><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:olive'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray'>P 425-672-1071 | F 425-778-8769 </span><span style='font-family:"Verdana","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:13.5pt;font-family:Webdings;color:#99CC00'>P</span><span lang=EN-GB style='font-family:Webdings;color:#99CC00'> </span><i><span lang=EN-GB style='font-size:7.0pt;font-family:"Verdana","sans-serif";color:#99CC00'>Please consider the environment before printing this email.</span></i><span style='color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='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"'> Christian Stalberg [mailto:cstalberg@naturalintelligence.us] <br><b>Sent:</b> Friday, September 23, 2011 6:16 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] built-in chiller curves vs. custom<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>I have a 725 ton chiller with full load efficiency (primary efficiency = .546 kw/ton) <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>and part load efficiency (NPLV = .464 kw/ton). What are peoples experience in <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>choosing whether to utilize eQUEST’s own built-in chiller curves versus creating <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>their own custom curves? Are there any rules of thumb as to when the later is <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>appropriate (because otherwise you are not getting the energy savings under<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>part load conditions)?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Thanks!<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></P>
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