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<DIV><FONT face=Arial size=2><SPAN class=334513902-28082007>In my quest to make
my HVAC models more realistic I am looking for some measured part load data for
VAV fans with variable speed drives. The theoretical part load curves I
have show a rapid fall in fan power as flowrate decreases. (something like
a power of 2.5 curve)</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=334513902-28082007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=334513902-28082007>A common design in
Australia uses a variable speed drive to maintain a minimum supply duct
static pressure (typically 200 to 300 Pa). This puts a floor under the
part load curve at low flowrates.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=334513902-28082007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=334513902-28082007>The other factor I'm
interested in is how the efficiency of the fan, motor and VSD change with
reducing flow-rate.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=334513902-28082007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=334513902-28082007>Can anyone point me
to published data from real VAV installations?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=334513902-28082007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=334513902-28082007>Thanks in
advance,</SPAN></FONT></DIV>
<DIV><B><SPAN
style="FONT-SIZE: 10pt; COLOR: #e64f0b; FONT-FAMILY: Arial"></SPAN></B> </DIV>
<DIV><B><SPAN style="FONT-SIZE: 10pt; COLOR: #e64f0b; FONT-FAMILY: Arial">Steve
Moller</SPAN></B><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial"><BR></SPAN><SPAN
class=helvetica><SPAN
style="FONT-SIZE: 8.5pt; COLOR: #4c1879; FONT-FAMILY: Arial">Senior ESD
Engineer</SPAN></SPAN><SPAN
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<P style="MARGIN: 0cm 0cm 0pt"><SPAN class=GramE><SPAN
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