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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010>Steven, Vikram, et. al., </SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010>Reid communictated with me in developing that
presentation, since I authored the spreadsheet tool. As the author of the
tool, I will vouch for the analytical approach, and the tool was peer reviewed
since it was funded by the California Commissioning
Collaborative.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010>As for tool useability, well, it is pretty useable but
not where I would like it to be. The tool (and others) is available
at:</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010><A
href="http://www.cacx.org/resources/rcxtools/spreadsheet_tools.html">http://www.cacx.org/resources/rcxtools/spreadsheet_tools.html</A></SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010>It was developed in Excel 2003; I am uncertain whether
there are any issues with other versions.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010>Yes, I believe the default DOE-2/eQuest VAV curves are
quite optimistic. Even the tool that comes out of my spreadsheet tool is
likely somewhat optimistic, even though it attempts to include fan, VFD, and
motor efficiencies at the various operating points. Pressure drops
relative to flow could be slightly better modeled for the portion of the system
with filters and coils, and that would further increase off-design
power.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010>How well a particular curve fits a particular system is
most significantly a function of </SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010>(1) whether and how the static pressure setpoint (to
which the VFD controls the fan speed) is reset.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010>(2) if the static pressure setpoint is not reset, where
the sensor is in the duct system, and how high the setpoint is relative to the
fan pressure rise.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010>This figure is related to what Reid showed in his
presentation, and relates some of these issues.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010></SPAN></FONT><FONT color=#0000ff size=2
face=Arial><SPAN class=859441223-05032010><FONT color=#0000ff size=2
face=Arial><SPAN class=859441223-05032010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010>--Bill</SPAN></FONT></DIV></SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010><IMG border=0 hspace=0 alt="" align=baseline
src="cid:859441223@05032010-0783"></SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010></SPAN></FONT><FONT color=#0000ff size=2
face=Arial><SPAN class=859441223-05032010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=859441223-05032010><FONT color=#000000 face=Tahoma>William E. Koran,
P.E.<FONT size=3 face="Times New Roman"> </FONT><BR>Senior Engineer</FONT><FONT
size=3><FONT color=#000000><FONT face="Times New Roman"> <BR></FONT><FONT
face=Tahoma>Q u E S T</FONT></FONT><FONT color=#000000 face="Times New Roman">
<BR></FONT></FONT><FONT color=#000000 size=1 face=Tahoma>Quantum Energy Services
and Technologies</FONT><FONT color=#000000><FONT size=3 face="Times New Roman">
<BR></FONT><FONT size=2 face=Tahoma>3945 Parker Road</FONT></FONT><FONT
color=#000000><FONT size=3 face="Times New Roman"> <BR></FONT><FONT size=2
face=Tahoma>West Linn, OR 97068</FONT></FONT><FONT color=#000000><FONT
size=3 face="Times New Roman"> <BR></FONT><FONT size=2 face=Tahoma>Voice:
503-557-7828</FONT></FONT><FONT color=#000000><FONT size=3
face="Times New Roman"> <BR></FONT><FONT size=2 face=Tahoma>Fax:
510-540-7268</FONT></FONT><FONT color=#000000><FONT size=3
face="Times New Roman"> <BR></FONT><FONT size=2 face=Tahoma>Web:</FONT><FONT
size=3 face="Times New Roman"> </FONT></FONT><A
title=blocked::http://www.quest-world.com/
href="blocked::http://www.quest-world.com/"><U
title=blocked::http://www.quest-world.com/></U><U
title=blocked::http://www.quest-world.com/><FONT
title=blocked::http://www.quest-world.com/ color=#0000ff size=2
face=Tahoma>www.quest-world.com</FONT></U></A></SPAN></FONT></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Steven
Savich<BR><B>Sent:</B> Friday, March 05, 2010 3:03 PM<BR><B>To:</B> 'Vikram
Sami'; 'eQUEST Users List'<BR><B>Subject:</B> Re: [Equest-users] More about
fans<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Vikram,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Reid Hart of PECI did a
presentation on this issue for the building simulation user's group a few months
ago, and discussed a spreadsheet tool to construct accurate DOE2 performance
curves for variable flow air and water systems. I believe the powerpoint
presentation is still archived on the BSUG yahoo site, and the spreadsheet is
downloadable from PECI's website. I haven't tried using this tool yet, so
I cannot vouch for its accuracy or useability.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Steven<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Bookman Old Style','serif'; COLOR: #1f497d">Steven Savich,
LEED AP</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; COLOR: #1f497d; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Bookman Old Style','serif'; COLOR: #1f497d; FONT-SIZE: 10pt">Systems
West Engineers</SPAN><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Bookman Old Style','serif'; COLOR: #1f497d; FONT-SIZE: 10pt">411
High Street</SPAN><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Bookman Old Style','serif'; COLOR: #1f497d; FONT-SIZE: 10pt">Eugene,
OR 97401-2427</SPAN><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Bookman Old Style','serif'; COLOR: #1f497d; FONT-SIZE: 10pt">(541)
342-7210</SPAN><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Bookman Old Style','serif'; COLOR: #1f497d; FONT-SIZE: 10pt">(541)
342-7220 (fax)</SPAN><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<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>Vikram
Sami<BR><B>Sent:</B> Friday, March 05, 2010 2:01 PM<BR><B>To:</B> eQUEST Users
List<BR><B>Subject:</B> [Equest-users] More about
fans<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN style="COLOR: #0000b4">Same model – different fan
question. Table G3.1.3.15 Gives you a part load performance table for VAV fan
systems. Based on that, I created a performance curve (linear) for my VAV fan
system that looks like this:<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0000b4"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0000b4"><IMG id=Picture_x0020_1
src="cid:859441223@05032010-077C" width=734 height=546><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0000b4"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0000b4"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0000b4">Problem is when I use this as
opposed to the default curve that came out of the wizard, the fan energy
doubles. The fan energy is still only 8% of the overall building load, so its
not alarming. Does this mean that the default curve was way to low? Is the
method above the way to model this performance curve?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0000b4"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0000b4">Thanks for your
help<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0000b4"><o:p> </o:p></SPAN></P>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
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