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<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Steve:</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>I received other responses suggesting the
same thing:</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>1. Use 2 stage absorption chiller with HIR of the turbine</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>2. Assign PLR curves of centrifugal chiller to corresponding
curves of absorption machine.</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;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 size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;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 size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;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 size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;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 size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;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 size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Varkie Thomas</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;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 size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>Thursday,
September 30, 2004</span></font><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> </span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>5:13 PM</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;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
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>Steam-Turbine
Drive</span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> Centrigugal Liquid Chillers</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;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 style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>----- Original Message ----- </span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='margin-left:.5in;background:#E4E4E4'><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:Varkie.Thomas@som.com" title="Varkie.Thomas@som.com">Varkie Thomas</a>
</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:BLDG-SIM@GARD.COM" title="BLDG-SIM@GARD.COM">BLDG-SIM@GARD.COM</a>
</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thursday,
September 30, 2004</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>12:58 PM</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> [BLDG-SIM] </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Steam-Turbine
Drive</span></font><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Centrigugal Liquid Chillers</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=navy
face="Times New Roman"><span style='font-size:12.0pt;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:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=navy
face="Times New Roman"><span style='font-size:12.0pt;color:navy'>Varkie Thomas</span></font></p>
</blockquote>
<pre style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> </span></font></pre></div>
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