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<DIV dir=ltr align=left><SPAN class=308451921-23012007><FONT
face="Lucida Console" color=#0000ff size=2>Hi John,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=308451921-23012007><FONT
face="Lucida Console" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=308451921-23012007><FONT
face="Lucida Console" color=#0000ff size=2>Isn't it "simply" a matter of the
derating coil heat transfer and pumping efficiencies, based on the percentage of
glycol concentration? Of course, deriving the derating factors is the not
so simple part... and probably the general solution would be to define a
parametric relationship between the glycol concentration and the coil and
pumping efficiencies.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=308451921-23012007><FONT
face="Lucida Console" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=308451921-23012007><FONT
face="Lucida Console" color=#0000ff size=2>Glycol manufacturer's data should
have plenty of info on the derating factors, perhaps even a parametric equation
that can be utilized in BDL.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=308451921-23012007><FONT
face="Lucida Console" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=308451921-23012007><FONT
face="Lucida Console" color=#0000ff size=2>Well that was the easy part... hope
it helps!</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=308451921-23012007><FONT
face="Lucida Console" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=308451921-23012007><FONT
face="Lucida Console" color=#0000ff size=2>Brandon Nichols,
PE<BR>Mechanical<BR>HARGIS ENGINEERS<BR>600 Stewart St<BR>Suite 1000<BR>Seattle,
WA 98101<BR>d | 206.436.0400 c | 206.228.8707<BR>o | 206.448.3376 f |
206.448.4450<BR><A
href="http://www.hargis.biz">www.hargis.biz</A><BR></FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> bldg-sim@gard.com
[mailto:bldg-sim@gard.com] <B>On Behalf Of </B>Aulbach, John<BR><B>Sent:</B>
Tuesday, January 23, 2007 11:12 AM<BR><B>To:</B>
bldg-sim@gard.com<BR><B>Subject:</B> [bldg-sim] Glycol Chillers/Pacakge
units..<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007><FONT face=Arial
color=#0000ff size=2>Hi Folks:</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007><FONT face=Arial
color=#0000ff size=2>I am running into a few office/data center buildings where
the main office areas are cooled by conventional chillers and the data
center/server areas are conditioned by either Liebert type package units or 40%
glycol-to-water mix chillers (colder climates that still need servers cooled).
Naturally, both units will be on the same electric meter.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007><FONT face=Arial
color=#0000ff size=2>The standard DOE-2 does not model glycol cooling, and
a commercial building does not need the refrigeration version of eQuest.
Usually, I know the kw/ton (or the moral equivalent) of the glycol cooling
source. But glycol/water does not have the same heat absorption properties as
straight shot water to follow the load.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007><FONT face=Arial
color=#0000ff size=2>I am trying to insure I am showing the correct energy
used by these units, as I believe the LEED now includes the process loads
within the Base and Proposed models to certify the level of LEED
obtained.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007><FONT face=Arial
color=#0000ff size=2>Does anyone have any "tricks" they have
used?</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=004200419-23012007>
<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>100 North Barranca, Suite
820</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>West Covina, CA 91791 USA</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Phone: 626-430-9054</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Fax: 626-430-9060</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><PRE>
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