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<div><span class="774355121-08122008"><font face="Arial" color="#0000ff" size="2">Not really. Some curves are the function of temperature and/or other variables with dimension. Although the results of the performance curves are usually dimensionless, the coefficients
of the curves depends on the unit of the variables.</font></span></div>
<blockquote dir="ltr" style="MARGIN-RIGHT: 0px">
<div class="OutlookMessageHeader" dir="ltr" align="left"><font face="Tahoma" size="2">-----Original Message-----<br>
<b>From:</b> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org]<b>On Behalf Of
</b>Dan Russell<br>
<b>Sent:</b> Monday, December 08, 2008 3:42 PM<br>
<b>To:</b> Chien Si Harriman; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] chiller performance curves?<br>
<br>
</font></div>
<div class="Section1">
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Can someone confirm this?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 14pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"> </span><span style="FONT-SIZE: 18pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham">Dan Russell, EIT
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"><img id="Picture_x0020_1" height="174" alt="cid:image001.jpg@01C840A4.E711B250" src="cid:774355121@08122008-08ed" width="200"></span><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</span></b><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Chien Si Harriman<br>
<b>Sent:</b> Monday, December 08, 2008 1:08 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] chiller performance curves?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">Hi all-</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<div>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">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><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">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><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Has either DOE2 or EnergyPlus already solved this problem, and I don't need to even think about itanymore?</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Thanks,</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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