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<p class=MsoNormal><span style='color:black'>You may want to run an eQuest
report on the chiller to see how the efficiency is varying throughout the year.
Output the load and the power at each hour and you should get a better idea of
whether the curves are working or not, or if the default curves are reasonable
for your specific equipment.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>David<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><a
href="http://www.grummanbutkus.com">http://www.grummanbutkus.com</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'>
<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 Russell<br>
<b>Sent:</b> Wednesday, December 02, 2009 10:35 AM<br>
<b>To:</b> Dan Nall; 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 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 style='margin-bottom:12.0pt'><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>
<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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