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<DIV><FONT face=Arial size=2>Varkie and Konstantine,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I am not sure this example goes far enough, for a
couple of reasons. Note, however, that I am not an expert on steam
turbines, and that last time I looked at this issue was over 10 years ago.
Hopefully, other people can contribute better information:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>1) It is my understanding that the
efficiency of a steam turbine degrades markedly when you throttle the
steam to unload the turbine. If so, then the part-load performance of a
steam-turbine centrifugal will degrade significantly during most hours of
operation, and custom temperature and PLR curves must be used to model this
effect. Default DOE-2 curves would not suffice.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>2) What pressure steam is available? If
150 psig, then the maximum thermodynamic efficiency of the turbine is less than
10% (I don't recall the exact figure anymore), and the mechanical efficiency is
only about half of that. And at 50% part load, the efficiency is
considerably less than at full load. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>3) On an annual basis, a 150 psig steam
turbine would be less than 5% efficient. Coupled with a chiller COP = 5,
the annual COP of the combination would be less than 0.25. In
comparison, a single-stage absorption chiller has a COP of about 0.7, and a
two-stage absorption chiller has a COP of about 1.2. So, unless there is a
use for the waste heat, this type of chiller will consume quite a bit of energy,
and I don't see how it could be cost effective.</FONT></DIV>
<DIV><FONT face=Arial size=2> </FONT>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Before analyzing this problem any
further using an energy simulation program, I suggest researching the
performance of a steam turbine at the available steam pressure, and then doing
some back-of-the-envelope calculations to determine whether the effort of a
detailed analysis is worth it. If the detailed analysis is justified,
DOE-2 does have a steam turbine electric generator algorithm. You might
start with the performance curves contained in that algorithm.</SPAN></P></DIV>
<BLOCKQUOTE dir=ltr
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=babetsk@jbb.com href="mailto:babetsk@jbb.com">Konstantine Babets</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=BLDG-SIM@GARD.COM
href="mailto:BLDG-SIM@GARD.COM">BLDG-SIM@GARD.COM</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, October 01, 2004 8:51
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [BLDG-SIM] Steam-Turbine Drive
Centrigugal LiquidChillers</DIV>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial
size=2></FONT><BR></DIV><FONT face=Arial size=2>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Varkie,</SPAN><o:p></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> <o:p></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">From my experience in modeling
similar plant combinations in NYC and using Con-Ed steam and
electric rates you mentioned, for a typical office building you will see a
benefit in using steam-turbine chillers (either option 2 and 3, depending on
your electrical load factor and refrigeration full load hours). Of course,
assuming that in all the cases you use reasonably efficient refrigeration
machines.</SPAN><o:p></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> <o:p></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Here is how you do it in
Doe2.1:</SPAN><o:p></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> <o:p></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">INPUT
PLANT..<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">ELEC-DRIVE=PLANT-EQUIPMENT<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>TYPE=HERM-CENT-CHLR<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>SIZE=24<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>INSTALLED-NUMBER=1<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>MAX-NUMBER-AVAIL=1
..<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">STEAM-CHILLER =
PLANT-EQUIPMENT<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">TYPE =
ABSOR2-CHLR<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">SIZE =
24<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">MAX-NUMBER-AVAIL=1
..<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">..<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"> <o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">EQUIPMENT-QUAD<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">ABSOR2-CAP-FT=CCAPT3<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">ABSOR2-HIR-FT=EIRT3<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">ABSOR2-HIR-FPLR=EIRPLR3<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">..<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"> <o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">.<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">.<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">.<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"> <o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Then in PLANT PARAMETRS
you specify <o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"> <o:p></o:p></SPAN></P>
<DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">ABSOR2-HIR
= ?</SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"></SPAN> </DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT
face=Arial>Hope this helps.</FONT></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT
face=Arial>Please let me know if you have further
questions</FONT></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT
face=Arial>Konstantin Babets</FONT></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT
face=Arial>Jaros Baum and Bolles</FONT></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT
face=Arial>(212) 530 9455</FONT></SPAN></FONT><FONT size=2></DIV></FONT>
<BLOCKQUOTE dir=ltr
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=Varkie.Thomas@som.com href="mailto:Varkie.Thomas@som.com">Varkie
Thomas</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=BLDG-SIM@GARD.COM
href="mailto:BLDG-SIM@GARD.COM">BLDG-SIM@GARD.COM</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, October 01, 2004 10:40
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [BLDG-SIM] Steam-Turbine Drive
Centrigugal LiquidChillers</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">Steve:</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">I received other responses suggesting
the same thing:</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">1. Use 2 stage absorption
chiller with HIR of the turbine</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">2. Assign PLR curves of
centrifugal chiller to corresponding curves of absorption
machine.</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">I assume this will produce reasonably
accurate steam consumption of the steam-turbine. I need a sample DOE2
Plant “inp” or “bdl” statements showing how to do this. The chillers
in question are </SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy">York</SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy"> model YST. </SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy">York</SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy"> will provide the performance data. The location
is NYC and the utility rates are ConEd Steam Service Classification 2 (lower
rates in summer) and ConEd Electric Service Classification 9 Rate II -
General Large Time of Use </SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"><A
href="http://q050-www5.coned.com/es/tariffs/ps.asp?URL=tariffs.htm&s=tariffs">http://q050-www5.coned.com/es/tariffs/ps.asp?URL=tariffs.htm&s=tariffs</A></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">Since there are several buildings in
NYC that use a hybrid plant of steam-turbine and electric-motor drive
chillers, I assume studies have already been done justifying this
combination. So far I have found the ASHRAE Sept 2003 article:
Advances in Steam Cooling by Ian Spanswick</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">I would like to compare the following
alternative options: (1) two 2000-ton electric-drive chillers, (2) two
2000-ton steam-drive chillers and (3) one 2000-ton electric-drive chiller
and one 2000-ton steam-drive chiller sequenced to “start first” based on
ConEd year-round steam and electric rates. This would be for (A) a
building that operates 24 hours per day such as a hospital, and (B) an
office building that operates 7 AM – 6 PM, Mon-Fri. I would also like
to see a life cycle cost analysis of the alternative options. Have
such studies been done for buildings located in cities with district steam
(NYC, </SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy">Boston</SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy">, </SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy">Philadelphia</SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy">, </SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy">Minneapolis</SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy">)?</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">The Trane TRACE700 program (which we
also use in this office along with Carrier’s HAP program) models
steam-turbine chillers. However the building in question has already
been modeled in detail with DOE2.1E using electric chillers. I prefer
to use DOE2.1E directly (we also have eQUEST and EnergyPro in the office)
for LEED certification and to show Code compliance. The building
description language (bdl) provides flexibility and it can be read like a
specification for others to review. Does this program have a
future? How many A-E design firms are using EnergyPlus on large
commercial building projects?</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy">Varkie Thomas</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">-----Original
Message-----<BR><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B>
postman@gard.com [mailto:postman@gard.com] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of
</SPAN></B>stvgates@pacbell.net<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> </SPAN></FONT><FONT face=Tahoma
size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Thursday,
September 30, 2004</SPAN></FONT><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> </SPAN></FONT><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">5:13
PM</SPAN></FONT><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> BLDG-SIM@GARD.COM<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> [BLDG-SIM] </SPAN></FONT><FONT
face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Steam-Turbine
Drive</SPAN></FONT><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> Centrigugal Liquid
Chillers</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">You would need to model it as an
absorption chiller. The chiller's heat input ratio and performance
curves would need to reflect the combination of the steam turbine and the
chiller compressor.</SPAN></FONT></P></DIV>
<BLOCKQUOTE
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<DIV>
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<P class=MsoNormal
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face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A
title=Varkie.Thomas@som.com href="mailto:Varkie.Thomas@som.com">Varkie
Thomas</A> </SPAN></FONT></P></DIV>
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<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><B><FONT face=Arial
size=2><SPAN
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face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A
title=BLDG-SIM@GARD.COM
href="mailto:BLDG-SIM@GARD.COM">BLDG-SIM@GARD.COM</A>
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<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><B><FONT face=Arial
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Sent:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">
</SPAN></FONT><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thursday, September 30,
2004</SPAN></FONT><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">12:58
PM</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><B><FONT face=Arial
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Subject:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">
[BLDG-SIM] </SPAN></FONT><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Steam-Turbine
Drive</SPAN></FONT><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> Centrigugal Liquid
Chillers</SPAN></FONT></P></DIV>
<DIV>
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size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
color=navy size=3><SPAN style="FONT-SIZE: 12pt; COLOR: navy">Has anyone
modeled steam turbine drive centrifugal chillers with DOE2.1E? Is it
possible to add this equipment to DOE2, given the part load performance
data?</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
color=navy size=3><SPAN style="FONT-SIZE: 12pt; COLOR: navy">Varkie
Thomas</SPAN></FONT></P></BLOCKQUOTE><PRE style="MARGIN-LEFT: 0.5in"><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt"> </SPAN></FONT></PRE></DIV><PRE>==================
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