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<DIV><SPAN class=040445318-09082011><FONT color=#0000ff
face=Calibri>Rohini/Bob/Lance,</FONT></SPAN></DIV>
<DIV><SPAN class=040445318-09082011><FONT color=#0000ff
face=Calibri></FONT></SPAN> </DIV>
<DIV><SPAN class=040445318-09082011><FONT color=#0000ff face=Calibri>Thanks for
your help,</FONT></SPAN></DIV>
<DIV><SPAN class=040445318-09082011><FONT color=#0000ff face=Calibri>Much
appreciated.</FONT></SPAN></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial></FONT> </DIV>
<DIV><FONT color=#0000ff face=Calibri></FONT><FONT color=#0000ff
face=Calibri></FONT><FONT color=#0000ff face=Calibri></FONT><BR> </DIV>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> Lance Brown
[mailto:lance@andelmanlelek.com] <BR><B>Sent:</B> Tuesday, August 09, 2011 1:36
PM<BR><B>To:</B> equest-users@lists.onebuilding.org<BR><B>Cc:</B> Umesh
Atre<BR><B>Subject:</B> RE: [Equest-users] CHW delta T in
eQUEST<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Since
you didn’t change the CHW supply temperature, the drop in chiller load is a
result of warmer return water returning to the chiller and improving the rate of
heat transfer to the evaporator. The drop in heat rejection is a direct result
of the reduced chiller load.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Depending
on your HVAC system parameters, you may have seen an increase in fan energy to
account for the less efficient heat transfer taking place at the cooling
coils.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
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<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Umesh
Atre<BR><B>Sent:</B> Tuesday, August 09, 2011 11:39 AM<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] CHW delta T
in eQUEST<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'">I am trying
to determine the effect of increasing the chilled water delta T on the energy
consumption in an office building. I set up 2 models,
</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'">one with 10
deg delta T, and the other increased to 15 deg on the chilled water loop (elec.
centrifugal chiller was used). All other parameters are same in both
models.</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'">The results
show a drop of ~14% in pump energy, but they also show a reduction on both
the cooling (~6%) and heat rejection (~3%). </SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'">Why does the increase in
chilled water delta T show savings on these 2 other end-uses?
</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'">Thanks for
any help</SPAN><o:p></o:p></P></DIV>
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