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64 TRG-TRC013-EN
Questions for Period 1
1 The total pressure generated by the fan is made up of two components,
__________ pressure and __________ pressure.
2 The total pressure (P
t
) measured within a duct is 3.5 in. H
2
O [872 Pa] and the
static pressure (P
s
) is 3 in. H
2
O [747 Pa]. Assume the air is at standard
conditions, ρ = 0.0749 lb/ft
3
[1.204 kg/m
3
].
a What is the velocity pressure (P
v
)?
b What is the air velocity (V)?
c If the outlet area of the fan is 1.5 ft
2
[0.14 m
2
], what is the fan airflow?
3 Using the fan performance curve in Figure 91, answer the following
questions:
a What property is plotted on the horizontal axis labeled A?
b What property is plotted on the vertical axis labeled B?
c What property is represented by the curves labeled C?
d What property is represented by the curves labeled D?
4 Again using Figure 91, what condition is represented by the region to the
left of the curve labeled E?
Questions for Period 2
5 List the three primary types of centrifugal fans.
$
%
&
'
(
Figure 91
Quiz