Environmental Engineering Reference
In-Depth Information
Table 3: Relationship between inlet air velocity
and heat dissipation of the heat exchanger [21].
v
c,in
(m/s)
Q
(kW)
8
41.5
9
49
10
56.5
11
62.5
12
64
13
64
14
64
15
64
16
64
17
64
18
64
19
64
20
64
21
64
22
64
23
64
24
64
25
64
Table 4: Parameters of the air and liquid side fi n pairs [ 21 ].
Types of the air side fi n pairs
Types of the liquid side fi n pairs
Parameter
cc1
cc2
cc3
cc4
cc5
ch1
ch2
ch3
ch4
ch5
Fin height,
12
9.5
6.5
4.7
3.2
3.2
4.7
6.5
9.5
12
L
c
(mm)
Fin height,
0.15
0.2
0.3
0.3
0.3
0.3
0.3
0.3
0.2
0.15
d
c (mm)
Fin interval,
m
c (mm)
1.4
1.7
1.7
2.0
4.2
4.2
2.0
1.4
1.7
1.4
The optimization procedure is shown in Fig. 8. The computational procedure is
as follows. Firstly, choose an air and liquid side fi n pair. Secondly, read the wind
velocity and rated heat dissipating capacity of the heat exchanger and then calcu-
late the heat exchanger thickness
c
to satisfy these conditions using an iterative
method. Finally, calculate the weight of the heat exchanger core unit, pressure
drop on the liquid side and other parameters like heat exchanger effi ciency and so
forth until all the calculation completes.
4.2.3 Interpretation of the optimization computing result
4.2.3.1 Wind condition numbers corresponding to the calculated heat exchanger
thicknesses larger than 0.2 m based on various fi n pair collocations
After choosing any air and liquid side fi n pair, 18 heat exchanger thicknesses can
be obtained corresponding to 18 wind conditions in order to match the cooling
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