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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>It’s the differential between the
entering condenser water temperature and the leaving chilled water temperature.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Savings for chillers with VFDs are dependent
on the pressure rise the impellor must overcome. Maximum savings accrue
if the dT is low when the load is low. If the cooling tower is running
warm when the load is low, then the impellor may have to run at close to full
speed to produce the required pressure rise and avoid surge. The dT term
takes that effect into account.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;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>David S Eldridge<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, April 01, 2008 2:12
PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] VSD
Chiller Curves</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><a
href="http://doe2.com/download/DOE-22/DOE22Vol6-NewFeatures_44e2.pdf">http://doe2.com/download/DOE-22/DOE22Vol6-NewFeatures_44e2.pdf</a>,
printed page 74 (PDF page 79).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;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>Chien Si Harriman<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, April 01, 2008 3:17
PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-sim] VSD Chiller
Curves<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi there-</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Curious if anyone out there knows anything about the chiller
EIR-fPLR curve that is inserted by default in eQuest, when a user selects a
variable frequency drive compressor? Most of the time, the EIR-fPLR curve
is a quadratic curve based only on the PLR, but this curve is biquadratic, with
another term called dt. Can anyone enlighten me on which dt they are
talking about here? I can't find it in the documentation.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Sincerely,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p style='mso-element:frame'><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'><a href="http://www.iesve.com/"><span
style='text-decoration:none'><img border=0 width=64 height=64
id="_x0000_i1025" src="cid:image001.jpg@01C8941D.C93F7240" name=graphics1></span></a><o:p></o:p></span></font></b></p>
</td>
<td width=236 valign=top style='width:177.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt'>
<p style='mso-element:frame'><b><font size=4 color=navy face=Arial><span
style='font-size:13.0pt;font-family:Arial;color:navy;font-weight:bold'>Chien
Si Harriman <br>
</span></font></b><b><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy;font-weight:bold'>West
Coast Technical Manager </span></font></b><o:p></o:p></p>
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<p style='mso-element:frame'><font size=1 color=navy face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:navy'>T: +1 415 533
9886 <br>
F: +1 617 459 5828<br>
</span></font><a href="http://www.iesve.com/"><font size=1 color=navy
face=Arial><span style='font-size:8.0pt;font-family:Arial;color:navy'>http://www.iesve.com
</span></font></a><o:p></o:p></p>
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<p style='mso-element:frame'><font size=1 color=navy face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:navy'>**Design, Simulate +
Innovate with the <Virtual Environment>**</span></font><o:p></o:p></p>
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