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<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff
size=2>All:</FONT></SPAN></DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff size=2>I have
run a Base Case and a Parametric run for a Central Plant serving an office
complex. Everything in both runs is the same, EXCEPT that the Base run has a
10°F differential temperature and the Parametric run has a 15°F differential
temperature. The CHW pump is variable speed.</FONT></SPAN></DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff size=2>As
expected, electric energy is saved (about 40,000 kWh/year for a 600 ton
plant). However, about 15,000 kWh is saved at the Chilled Water pump, and
22,000 kWh is saved at the chiller.</FONT></SPAN></DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff size=2>I
changed the Loop Design DT to 15°F and the CHW Coil Design Delta T to
15°F.</FONT></SPAN></DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff size=2>Why is
my chiller energy reducing?</FONT></SPAN></DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff
size=2>Thanks.</FONT></SPAN></DIV>
<DIV><SPAN class=930022000-31102008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=930022000-31102008>
<DIV align=left>
<DIV align=left><FONT color=#0000ff>John R. Aulbach, PE, CEM</FONT></DIV>
<DIV align=left><FONT face=Arial size=2><EM>Project Manager</EM></FONT></DIV>
<DIV align=left><FONT face=Arial size=2><FONT color=#0000ff>Nexant,
Inc</FONT>.</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>701 West Kimberly Ave., Suite
245</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Placentia, CA 92870-6342
USA</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Phone: 714-524-4402</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Fax: 714-524-4407</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>email: <A
title=mailto:jaulbach@nexant.com
href="mailto:jaulbach@nexant.com">jaulbach@nexant.com</A></FONT></DIV>
<DIV> </DIV></DIV></SPAN></DIV></BODY></HTML>