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Heat Transfer
book

Heat Transfer

by Younes Shabany
December 2009
Intermediate to advanced content levelIntermediate to advanced
523 pages
18h 30m
English
CRC Press
Content preview from Heat Transfer
Forced Convection Heat Transfer: Internal Flows 275
P
P
D
D
N
N
2
1
2
1
5
2
1
3
2
1
=
ρ
ρ
,
(11.78)
SPLSPL
N
N
21
2
1
5
2
1
2
10=+
log.
ρ
ρ
(11.79)
The following observations can be made:
The fan ow rate is independent of density while its pressure rise is propor-•
tional to it. Air density decreases with altitude and therefore the performance
curve of a fan will be different at various altitudes. Figure 11.13 compares
performance curves of a typical fan at different altitudes. It must be noted
that this is true for constant speed fans such as the AC fans. For the constant
voltage DC fans, a reduction in air density may cause an increase
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Publisher Resources

ISBN: 9781439814680