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<DIV><FONT face=Arial size=2>Chien Si, others,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The problem is more complicated than what you're
asking, because EnergyPlus and DOE-2 do not necessarily express their
curves using the same equation formulation. When I worked a few years back
in translating DOE-2 inputs to EnergyPlus, I (or others in the then
LBNL team!) had to reformulate many of the equations and coefficients, and
in some cases, redo the curve fit from scratch. As several people have
already pointed out, even if the equation is the same, the coefficients are
unit-specific and hence differ between IP and SI. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Joe Huang</FONT></DIV>
<DIV><FONT face=Arial size=2>White Box Technologies</FONT></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=chien.harriman@iesve.com href="mailto:chien.harriman@iesve.com">Chien
Si Harriman</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=bldg-sim@lists.onebuilding.org
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, December 08, 2008 12:08
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Bldg-sim] chiller performance
curves?</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial color=#000000 size=2>Hi all-</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>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? </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>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?) </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Has either DOE2 or EnergyPlus already solved this
problem, and I don't need to even think about itanymore?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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