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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Well, I’m going over a year back into the archives, but
hopefully someone can help. I’m modeling a project with 500 Ton Carrier Evergreen
Water-Cooled Screw Chillers and would like to take advantage of the part-load
efficiency benefits. It appears that Dan Nall posted custom efficiency curves
for this specific equipment a while back, but when I use them in eQUEST my cooling
energy gets tripled (from 800 MWh to 2450 MWh) as compared to the default eQUEST
curves for Water-cooled Screw chillers. Does anyone have experience using
these curves effectively? Am I misinterpreting the curve data? Are they
intended for something other than eQUEST inputs? Or are the default eQUEST
curves unrealistically efficient?<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks for any input,<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dan Russell<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Engineering Incorporated<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>
<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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Dan Nall<br>
<b>Sent:</b> Tuesday, August 26, 2008 1:17 PM<br>
<b>To:</b> Kingsley,Michael L.; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Variable Speed Screw Chiller Curves<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>Try
these on for size;<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>"VFDSCrew
EIR fPLR" = CURVE-FIT <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>TYPE
= CUBIC<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>INPUT-TYPE
= DATA<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>INDEPENDENT
= ( 1, 0.75, 0.5, 0.25 )<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>DEPENDENT
= ( 1, 0.97307, 1.01436, 1.3616 )<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>..<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>"Carrier-EIR-fCHWT&CWT"
= CURVE-FIT <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>TYPE
= BI-QUADRATIC-T<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>INPUT-TYPE
= COEFFICIENTS<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>COEFFICIENTS
= ( 0.767051, -0.0236208, 0.0004375, 0.0024939, 0.0002337, <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>-0.000418
)<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>..<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>"Carrier-EIR-fPLR&dT"
= CURVE-FIT <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>TYPE
= BI-QUADRATIC-RATIO&DT<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>INPUT-TYPE
= COEFFICIENTS<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>COEFFICIENTS
= ( -0.0230025, 0.902964, 0.0935993, 0.00347819, <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>-2.45759e-005,
-0.00196462 )<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>..<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>"Carrier-CAP-fCHWT&CWT"
= CURVE-FIT <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>TYPE
= BI-QUADRATIC-T<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>INPUT-TYPE
= COEFFICIENTS<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>COEFFICIENTS
= ( 0.448509, 0.0185587, -0.00028125, 0.00306901, <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>-5.0201e-005,
0.000108475 )<o:p></o:p></span></p>
<p><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><br>
<br>
<br>
<o:p></o:p></span></p>
<blockquote style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:0in;margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:black'>-----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>
<br>
<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>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><span style='color:black'><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> </span><span
style='color:black'><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Thanks in
advance.</span><span style='color:black'><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> </span><span
style='color:black'><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:black'>Michael Kingsley<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:black'> <o:p></o:p></span></p>
</blockquote>
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