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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'>In eQUEST a curve that references temperatures
or other dimensioned variables must be fit using English units. We plan to
address this at some point in the future.<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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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<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>Dan Russell<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, December 08, 2008
1:42 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Chien Si Harriman;
bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] chiller
performance 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=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>It is my
understanding that the chiller curve data are dimensionless ratios, so the
curve-fits should work regardless of units-system. The raw data would be
different, but the curve coefficients should be identical.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Can someone confirm
this?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=4 color="#a0002f" face=Cheltenham><span
style='font-size:14.0pt;font-family:Cheltenham;color:#A0002F'> </span></font><font
size=5 color="#a0002f" face=Cheltenham><span style='font-size:18.0pt;
font-family:Cheltenham;color:#A0002F'>Dan Russell, EIT <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#a0002f" face=Cheltenham><span
style='font-size:10.0pt;font-family:Cheltenham;color:#A0002F'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#a0002f" face=Cheltenham><span
style='font-size:10.0pt;font-family:Cheltenham;color:#A0002F'><img width=200
height=174 id="Picture_x005f_x0020_1" src="cid:image001.jpg@01C9593C.00CE26F0"
alt="cid:image001.jpg@01C840A4.E711B250"></span></font><font size=2
color="#1f497d" face=Calibri><span style='font-size:11.0pt;font-family:Calibri;
color:#1F497D'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><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>Chien Si Harriman<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, December 08, 2008
1:08 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] chiller
performance 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 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Hi all-</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>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Sort of technical question here that requires some knowledge
of the inner workings of either EnergyPlus or DOE2/eQuest...hoping there is
someone out there who knows the answers to this. What does either an
EnergyPlus or DOE2 user have to do when dealing with different units,
particularly when it comes to the curve fits? Obviously, the same
coefficients do not apply for both units. Do the default curve
coefficients for the chiller, for example, have both IP and metric
equivalents? </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>
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<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Does anyone know how this works? Has anyone bumped
into a regression model that can take raw data in metric units, and create a
set of coefficients in one set of units (let's say IP for starters), and then
use those newly-created coefficients, generate an new set of raw data, and
then create a new regression to produce a new set of coefficients in
converted units (Metric, in this case?) </span></font><o:p></o:p></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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<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Has either DOE2 or EnergyPlus already solved this problem,
and I don't need to even think about itanymore?</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'>Thanks,</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>
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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 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 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 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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