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26 TRG-TRC013-EN
notes
period one
Fan Performance
Similar to both the centrifugal and fixed-pitch vaneaxial fans, the intersection of
the system resistance curve and the blade pitch curve establishes the airflow
and total pressure at which this fan and this system will balance.
While the system design conditions are typically stated in terms of static
pressure, the VPVA fan manufacturer provides conversion factors that enable
the system designer to establish the fan – system balance point in terms of total
pressure.
surge region
surge region
airflow
airflow
total pressure
total pressure
design system
resistance curve
design system
design system
resistance curve
resistance curve
50%
50%
70%
70%
80%
80%
85%
85%
50º
50º
40º
40º
35º
35º
30º
30º
20º
20º
15º
15º
55º
55º
45º
45º
25º
25º
bl
ade
pi
t
c
h
(
an
gl
e)
bl
ade
pi
t
c
h
(
angl
e)
Figure 37