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<P>As one would expect, they are distinctive positive displacement curves, relatively linear for part load, but with large COP increases at reduced temperature differential between CHW and CW. They are very different from teh variable speed centrifugal curves.</P>
<P>I don't know of anyone but Carrier that is offering a packaged variable speed screw chiller.<BR><BR>-----Original Message----- <BR>From: Steven Gates <STVGATES@PACBELL.NET><BR>Sent: Aug 26, 2008 5:05 PM <BR>To: 'Demba Ndiaye' <DEMBA.NDIAYE@SETTY.COM>, 'Dan Nall' <DANNALL@MINDSPRING.COM>, "'Kingsley,Michael L.'" <MICHAEL.L.KINGSLEY@SAIC.COM>, bldg-sim@lists.onebuilding.org <BR>Subject: RE: [Bldg-sim] Variable Speed Screw Chiller Curves <BR><BR><ZZZHTML xmlns="http://www.w3.org/TR/REC-html40" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:ns0="http://schemas.microsoft.com/office/2004/12/omml"><ZZZHEAD><ZZZMETA CONTENT="text/html; charset=us-ascii" HTTP-EQUIV="Content-Type"><ZZZMETA content="Microsoft Word 11 (filtered medium)" name="Generator"><ZZZ!--[IF !mso]>
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<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">They are based on published data from one of the major chiller manufacturers. While specific to that manufacturer, they are believed to be representative of that class of chillers.<?xml:namespace prefix = o /><o:p></o:p></SPAN></FONT></P>
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<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org] <B><SPAN style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Demba Ndiaye<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, August 26, 2008 12:31 PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Dan Nall; Kingsley,Michael L.; bldg-sim@lists.onebuilding.org<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [Bldg-sim] Variable Speed Screw Chiller Curves</SPAN></FONT><o:p></o:p></P></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri color=#1f497d size=2><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: Calibri">Can you please share with us the source of these curves?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri color=#1f497d size=2><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: Calibri"><o:p> </o:p></SPAN></FONT></P>
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<P class=MsoNormal><FONT face=Arial color=#1f497d size=2><SPAN style="FONT-SIZE: 10pt; COLOR: #1f497d; FONT-FAMILY: Arial">______________</SPAN></FONT><FONT color=#1f497d><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></FONT></P></DIV>
<P class=MsoNormal><FONT face=Arial color=#1f497d size=2><SPAN style="FONT-SIZE: 10pt; COLOR: #1f497d; FONT-FAMILY: Arial">Demba Ndiaye</SPAN></FONT><FONT face=Calibri color=#1f497d size=2><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: Calibri"><o:p></o:p></SPAN></FONT></P>
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<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org] <B><SPAN style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Dan Nall<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, August 26, 2008 3:17 PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Kingsley,Michael L.; bldg-sim@lists.onebuilding.org<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [Bldg-sim] Variable Speed Screw Chiller Curves<o:p></o:p></SPAN></FONT></P></DIV></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=1><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: Arial">Try these on for size;<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">"VFDSCrew EIR fPLR" = CURVE-FIT <o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">TYPE = CUBIC<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">INPUT-TYPE = DATA<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">INDEPENDENT = ( 1, 0.75, 0.5, 0.25 )<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">DEPENDENT = ( 1, 0.97307, 1.01436, 1.3616 )<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">..<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">"Carrier-EIR-fCHWT&CWT" = CURVE-FIT <o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">TYPE = BI-QUADRATIC-T<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">INPUT-TYPE = COEFFICIENTS<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">COEFFICIENTS = ( 0.767051, -0.0236208, 0.0004375, 0.0024939, 0.0002337, <o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">-0.000418 )<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">..<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">"Carrier-EIR-fPLR&dT" = CURVE-FIT <o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">TYPE = BI-QUADRATIC-RATIO&DT<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">INPUT-TYPE = COEFFICIENTS<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">COEFFICIENTS = ( -0.0230025, 0.902964, 0.0935993, 0.00347819, <o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">-2.45759e-005, -0.00196462 )<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">..<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">"Carrier-CAP-fCHWT&CWT" = CURVE-FIT <o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">TYPE = BI-QUADRATIC-T<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">INPUT-TYPE = COEFFICIENTS<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">COEFFICIENTS = ( 0.448509, 0.0185587, -0.00028125, 0.00306901, <o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">-5.0201e-005, 0.000108475 )<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Arial color=black size=1><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: Arial"><BR><BR><BR> <o:p></o:p></SPAN></FONT></P>
<BLOCKQUOTE style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; MARGIN-TOP: 5pt; PADDING-LEFT: 4pt; MARGIN-BOTTOM: 5pt; PADDING-BOTTOM: 0in; MARGIN-LEFT: 0in; BORDER-LEFT: blue 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium none">
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face=Arial color=black size=1><SPAN style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: Arial">-----Original Message----- <BR>From: "Kingsley, Michael L." <BR>Sent: Aug 26, 2008 2:15 PM <BR>To: bldg-sim@lists.onebuilding.org <BR>Subject: [Bldg-sim] Variable Speed Screw Chiller Curves <BR><BR><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Does anyone have DOE-2 performance curves for a variable speed screw chiller (I believe the Carrier Evergreen 23XRV is the only one now) that they would be willing to share?</SPAN></FONT><FONT color=black><SPAN style="COLOR: black"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial"> </SPAN></FONT><FONT color=black><SPAN style="COLOR: black"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Thanks in advance.</SPAN></FONT><FONT color=black><SPAN style="COLOR: black"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial"> </SPAN></FONT><FONT color=black><SPAN style="COLOR: black"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><FONT face="Times New Roman" color=black size=3><SPAN style="FONT-SIZE: 12pt; COLOR: black">Michael Kingsley<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><FONT face="Times New Roman" color=black size=3><SPAN style="FONT-SIZE: 12pt; COLOR: black"> <o:p></o:p></SPAN></FONT></P></BLOCKQUOTE></DIV></DIV></ZZZBODY></ZZZHTML></BLOCKQUOTE></BODY>