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aTCA-80606PA
8 Thermal
8.1 System Airflow Path
The 6 slots ATCA Shelf provides an airflow using two Fan Trays at right and
left sides of the Shelf. Each Fan Tray has 6 fans moving air from the right side
to the left side of the Shelf in a push-pull arrangement. This arrangement
provides excellent airflow as well as fault tolerance in the unlikely event of a
fan failure.
Figure 10: General airflow path for the 6U 6 slot ATCA Shelf
8.2 Cooling Capacity
The maximum system airflow (all fans at full speed) is 387.3 CFM.
The maximum air distribution is measured with front and RTM test boards.
Front board impedance = 37 Pa pressure drop at 50 m³/h (30 CFM).
The maximum average per slot cooling capacity is:
•
Front slot: 340 W with ∆T = 12 K
•
Rear slot:
35 W with ∆T = 12 K
8.2.1 Front Board Air Distribution
The airflow is measured with impedance boards acc. to the PICMG 3.0 R3.0
specification.
•
Front board pressure drop: 37 Pa at 0.85 m³/min
