Kontron AT8060 - Manual (Page 128)

Thermal Considerations
113 AT8060
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6.1.3 Airflow blockers
It is highly recommended to use airflow blockers (ATCA slot) and AMC airflow blocker in the AT8060 (or any
empty AMC slot) to block any slot open to exterior air. Failure to do so, would go against forced air principles
applied on ATCA components, reducing system's cooling efficiency. Additionally, airflow blockers offer a
higher impedance to forced air than typical board, who tend to let more air into slots filled with AT8060 or
other ATCA boards.
6.1.4 System Airflow
The airflow impedance (pressure) curve gives multiple information and tips about thermal operational range
of the system carrying the AT8060. Once volumetric airflow capability of your chassis is known, the PQ curve
can help determine the ambient (room) temperature setpoint that should be used for optimal operation. If
you are using various models of ATCA blades into the same chassis, it is possible to find the best thermal fit.
Having the volumetric airflow value for each chassis slot, it is then possible to decide the layout using the
pressure curves.
Table 6-2:Pressure curve AT8060 with AM4320 in bay AMC
Figure 6-1:Pressure Curve in Imperial
Test Poin Airflow (CFM) Pressure drop
(in H2O) Airflow (m³/h) Pressure Drop
(Pa)
1 17.84 0,071 30.48 17.75
2 22.39 0.102 38.03 25.38
3 25.30 0.123 42.98 30.56
4 31.64 0.174 53.75 43.27
5 39.95 0.257 67.87 63.92
6 49.98 0.377 84.92 93.99