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<DIV dir=ltr align=left><SPAN class=234033502-14102010><FONT color=#0000ff
size=2 face=Arial>The physics that says energy use of a fan or pump is
proportional to the cube of the speed <U>is for a fixed system</U>. Most
building systems are not fixed, since there are dampers or valves that regulate
flow to satisfy a setpoint, and the speed is varied to maintain a static
pressure (air systems) or differential pressure (fluid systems). A system
with perfect pressure setpoint reset--which is all but impossible for a system
serving multiple zones--can approach the cube "law." I'm not up-to-speed
on current eQuest defaults. But for most systems, earlier default DOE-2
curves were not conservative, but were optimistic at lower flows, partly because
of the fixed pressure the system is serving, and also because of the VFD/motor
efficiencies start to drop at low flows. There has been a number of ASHRAE
papers on system correlations. One study you may wish to review is
</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=234033502-14102010><FONT color=#0000ff
size=2 face=Arial><A
href="http://www.energy.ca.gov/2003publications/CEC-500-2003-082/CEC-500-2003-082-A-21.PDF">http://www.energy.ca.gov/2003publications/CEC-500-2003-082/CEC-500-2003-082-A-21.PDF</A></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=234033502-14102010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=234033502-14102010><FONT color=#0000ff
size=2 face=Arial>Start with Figure 9 on page 14. </FONT></SPAN></DIV>
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class=234033502-14102010></SPAN><SPAN class=234033502-14102010><FONT
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<DIV dir=ltr align=left><SPAN class=234033502-14102010><FONT color=#0000ff
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<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>Erik
Kolderup<BR><B>Sent:</B> Wednesday, October 13, 2010 2:37 PM<BR><B>To:</B>
'James Hansen'; 'Clifford McDonald';
equest-users@lists.onebuilding.org<BR><B>Subject:</B> Re: [Equest-users] Default
Performance Curves<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">The
DOE2 EIR-FPLR curves include PLR in the value. In other words, you might expect
the <SPAN class=234033502-14102010><FONT color=#0000ff size=2
face=Arial> </FONT></SPAN>value of the curve to be (EIR at current
load)/(EIR at full load), but it’s actually PLR*(EIR at current load)/(EIR at
full load). So if you have a piece of equipment that has constant efficiency
across the full load range, then the curve will be a straight line between (0,0)
and (1,1). You have to look pretty closely at the background docs, such as the
DOE2.1A Engineer’s Manual, to see that.<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">-Erik
<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><B><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Erik
Kolderup, PE, LEED AP<o:p></o:p></SPAN></B></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Kolderup
Consulting | 415.531.5198 | <A
href="mailto:erik@kolderupconsulting.com">erik@kolderupconsulting.com</A><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"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
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<DIV>
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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"> James Hansen
[mailto:JHANSEN@ghtltd.com] <BR><B>Sent:</B> Wednesday, October 13, 2010 1:50
PM<BR><B>To:</B> Clifford McDonald;
equest-users@lists.onebuilding.org<BR><B>Subject:</B> Re: [Equest-users] Default
Performance Curves<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Someone
will be able to explain this better than me, but eQuest curves are not
intuitive. I wish they were, but they aren’t.<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">As
an example: when you enter a chiller EIR curve as a function of PLR, you
would think this would be really easy, right? 0.1, 0.2, 0.3 etc as the
PLR, and then the corresponding EIR (KW consumed vs current tonnage). But
that’s not the case….you end up basically having to square the EIR to get proper
outputs. Perhaps the same thing needs to be done here?
<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">Again,
someone will chime in with the real reasoning for this, as I’ve seen it
discussed before.<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><B><SPAN
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Limited<BR></SPAN></B><B><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 11pt"><ns0:PersonName><SPAN
style="COLOR: black">James Hansen</SPAN></ns0:PersonName></SPAN></B><B><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: black; FONT-SIZE: 11pt">, PE,
LEED AP<o:p></o:p></SPAN></B></P>
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<P class=MsoNormal><B><SPAN
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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>Clifford
McDonald<BR><B>Sent:</B> Wednesday, October 13, 2010 4:29 PM<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] Default
Performance Curves<o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Hello,<o:p></o:p></P>
<DIV>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<DIV>
<P class=MsoNormal>I'm fairly new to eQuest, but I was looking at the default
performance curves for VSDs on fans and pumps (EIR as a function of PLR), and
with the exception of the cooling tower fan (htrej-Fan-Pwr-fSpeed) which is a
cubic equation, they are all quadratic equations. Why would this be when,
in theory, energy use should vary with the cube of motor speed with a VSD?
Why would it be quadratic for supply fans and chilled water pumps but
cubic for cooling tower fans? Is there anywhere I can go to get more
information on these default values?<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<DIV>
<P class=MsoNormal>Thanks for the help...<o:p></o:p></P></DIV>
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