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<DIV dir=ltr align=left><SPAN class=632142119-04022009><FONT face=Arial
color=#0000ff size=2>Thanks Matt,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=632142119-04022009><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=632142119-04022009><FONT face=Arial
size=2><FONT color=#0000ff>I was confused by the line right after the lines you
quoted for me, on page 7: <FONT face="Times New Roman"
size=3>"</FONT></FONT><FONT color=#0000ff><FONT size=3><FONT
face="Times New Roman">The DES central plant itself shall always be modeled as a
total, entire unit."<SPAN class=632142119-04022009>
</SPAN></FONT></FONT></FONT></FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><SPAN class=632142119-04022009><FONT face=Arial color=#0000ff
size=2>Unfortunately I don't think we have a part load curve for the CUP
yet. Do you have a sense of how off my energy use will be? I'm
guessing the default PL curve for Electric Centrifugal Chiller is on the
conservative side...</FONT></SPAN></DIV>
<DIV><SPAN class=632142119-04022009><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=632142119-04022009><FONT face=Arial color=#0000ff
size=2>Best,<BR>Linda</FONT></SPAN></DIV>
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Linda Lam, LEED® AP
WSP Flack + Kurtz
405 Howard Street, Suite 500
San Francisco, CA 94105
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<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> Matthew Dubrovich
[mailto:mdubrovich@emcengineers.com] <BR><B>Sent:</B> Wednesday, February 04,
2009 11:13 AM<BR><B>To:</B> Lam, Linda;
equest-users@lists.onebuilding.org<BR><B>Subject:</B> RE: [Equest-users]
District Heating and District Cooling<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Linda,
<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Page
7 of the LEED document instructs you to “use a virtual heating plant with the
same seasonal heating efficiency of the entire upstream DES heating system” and
goes on to say that it is permissible to model part load conditions. There
is similar wording for the CHW plant. You don’t need to use the actual
capacities of the plants or the attached loads, just the actual efficiencies
(and an estimate of the part load curve possibly). Which is much simpler
than trying to account for everything else attached to the
plant.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
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<DIV>
<P class=MsoNormal><B><I><SPAN
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Dubrovich, </SPAN></I></B><I><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'BankGothic Md BT','sans-serif'">P.E.<o:p></o:p></SPAN></I></P>
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AP</SPAN><SPAN
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Engineer</SPAN><SPAN
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<P class=MsoNormal><SPAN
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<P class=MsoNormal><SPAN
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Engineers, Inc.<o:p></o:p></SPAN></P>
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<DIV>
<DIV
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<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Lam,
Linda<BR><B>Sent:</B> Wednesday, February 04, 2009 9:19 AM<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] District
Heating and District Cooling<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">All,</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">I am trying to model
a building that will have chilled water and hot water supplied by a Central
Utility Plant. According to the attached "Required Treatment of District
Thermal Energy in LEED-NC version 2.2 (May 28,2008)", there will be 4 models
required. The first set of 2 with purchased CHW and HW. The second
set of 2 with the entire CUP modeled in the Proposed case and a boiler/chiller
plant autosized for the Baseline case. </SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">If that reasoning is
correct, then how do I account for the energy used by the other buildings using
the CUP? Do I add it on as Process Energy on my Chilled Water and Hot
Water loops? How do I calculate the load on the Condenser Water loop? What
if I don't know what the loads in the other buildings
are?</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Thank you in
advance!</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Linda</SPAN><o:p></o:p></P></DIV>
<DIV>
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