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<DIV dir=ltr align=left><SPAN class=234153317-14112008><FONT face=Arial
color=#0000ff size=2>Dear Dan,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=234153317-14112008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=234153317-14112008><FONT face=Arial
color=#0000ff size=2>There's only one "fanwall" manufacturer (Mammoth), so I'd
start with them. However, physics is physics, and motor efficiencies are
known from each motor manufacturer. Thus, knowing which motor mfr is used
will help, as will the fan curve for all those small backward inclined, airfoil
fans.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=234153317-14112008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=234153317-14112008><FONT face=Arial
color=#0000ff size=2>As you may know, plug fans such as are used by fanwalls
have (generally) poor documentation regarding their performance inside a
cabinet. The wall spacing and direction of discharge (axial vs.
radial) affect performance significantly. Here again, I'd start by
talking to the manufacturing source. The local sales rep may not have the
info, but Mammoth is pretty good at their tech support.
</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=234153317-14112008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=234153317-14112008><FONT face=Arial
color=#0000ff size=2>Finally, I suspect that the differences in performance from
a single fan application will be rather small and a specific single fan
application might actually give BETTER performance than a fanwall,
depending on how close you are to the curve "sweet spot" for your specific
application. Benefits from a fanwall are more likely (in my opinion) to be
related to space requirements, redundancy, and sound.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=234153317-14112008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=234153317-14112008><FONT face=Arial
color=#0000ff size=2>Good luck (and please share your
findings!)</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV class=Section1>
<P class=MsoNormal style="TEXT-ALIGN: center" align=center><B
style="mso-bidi-font-weight: normal"><FONT size=4>The Building Performance
Team<BR></FONT></B><B style="mso-bidi-font-weight: normal">James V. Dirkes II,
P.E., LEED AP<BR></B>1631 Acacia Drive NW<BR>Grand Rapids, MI 49504<BR>616
450 8653<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<DIV> </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-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Dan
Russell<BR><B>Sent:</B> Friday, November 14, 2008 11:05 AM<BR><B>To:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> [Bldg-sim] Fanwall Air
Handlers<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal>Has anyone had experience with modeling fanwall air handlers
and their proposed efficiency benefits? The primary efficiency claim is
that they have superior part-load performance due to the ability of their
smaller motors to operate in a range from 60 – 120 Hz optimizing the operation
efficiency. Does anyone have or know where to get data to build a
part-load curve for this type of fan operation?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Thanks,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"> </SPAN><SPAN
style="FONT-SIZE: 18pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham">Dan Russell,
EIT <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"><IMG
id=Picture_x0020_1 height=174 alt=cid:image001.jpg@01C840A4.E711B250
src="cid:234153317@14112008-2405" width=200></SPAN><o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV></BODY></HTML>