3 airflow impedance, 4 airflow paths, Airflow impedance – Kontron AM4220 User Manual
Page 44: Airflow paths
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4.2.3
Airflow Impedance
In order to determine the cooling requirements of the AM4220, the airflow impedance of the module has
been determined via simulation. No card guides or struts have been used for the simulations because the
resulting airflow impedance depends on individual configuration of the AMC carrier or MicroTCA system.
Figure 4-3:AM4220 Impedance Curve
4.2.4
Airflow Paths
The area between the front panel and the AMC Card-edge connector is divided into five zones, one I/O zone
and four uniform thermal zones, A, B, C, and D. The PICMG AMC.0 Specification states that the uniformity of
the airflow paths' resistance should provide an impedance on the A, B, C, and D zones that is within ± 25% of
the average value of the four thermal zones.
Figure 4-4:Thermal Zones of the AM4220
0,0000
0,0500
0,1000
0,1500
0,2000
0,2500
0
100
200
300
400
500
600
700
800
FLOW (LFM)
P
R
E
S
S
U
R
E
DR
O
P
(
In
ch
H2
O
)
0
10
20
30
40
50
60
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
FLOW (m/s)
PR
E
SSU
R
E
D
R
O
P
(
P
a
)