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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'>Dan,<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'>I think I misspoke in my reply below.<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'>I believe the standard version of
eQUEST/DOE-2 allows you to input curve fit DATA using either English or metric;
if metric independent temperatures are used, the Building Design Language
processor should convert the metric temperatures to English before doing the
curve fit. The coefficients generated would then expect hourly
temperature in English. However, if you do a curve fit independently of
BDL using metric temperatures, and simply give the program the COEFFICIENTS
rather than the DATA, then the curve would expect metric temperatures, and the
hourly curve algorithm would feed it English; resulting in a severe error.<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'>So, as long as you generate the curve
using BDL, I believe you can use either English or metric units. It
should be easy enough to test to confirm. Just input the same curve with
both English and metric temperatures (specifying METRIC input), and see if you
get the same coefficients. If this is not the case, please let me know.<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'>The refrigeration version of the program
has a curve-fit routine that allows either English or metric curve coefficients
to be used; there is a keyword that allows you to specify which values you are
using. So the library could have curves of both types in it. On an
hourly basis, if the curve is metric, the program converts the input
temperatures from English to metric, feeds them into the curve, and converts
the output from metric back to English (if the output has dimensional
units). Hopefully, we will port that algorithm over to the standard
version 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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Steve<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>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
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'> Steven Gates
[mailto:stvgates@pacbell.net] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, December 08, 2008
1:51 PM<br>
<b><span style='font-weight:bold'>To:</span></b> 'Dan Russell'; '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=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>
<div>
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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_x005f_x005f_x0020_1"
src="cid:image001.jpg@01C95948.CE0DFB70"
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>
</div>
<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>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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>
</div>
<div>
<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>
</div>
<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>
<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'>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>
</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=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=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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