Emerson Liebert XDR, User Manual

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Mechanical Considerations
11
4.3 Airflow
The server fans draw air into the equipment enclosure. After heated the air, the server fans force the
air across the Liebert XDR’s two coils. The Liebert XDR has a low air-side pressure drop (similar to a
rack with perforated doors). The server fans within the rack create sufficient airflow to move the air.
Figure 10 Generic airflow diagram
Efficient cooling of rack equipment depends on proper use of blanking plates in any voids in the rack
and good cable management. Keep the Liebert XDR’s coils clear of any obstructions that may block
the airflow.
Each of the Liebert XDR’s coils removes approximately half the load. For even cooling in partially
filled racks, servers should be evenly spaced and blanking plates should be installed on unused rack
spaces to prevent recirculation of heated air.
NOTE
Air bypass and recirculation can severely reduce the cooling effectiveness of the Liebert XDR.
Blanking plates must be installed in any voids in the rack to prevent air bypass and air
recirculation. Contact the factory for further information. Refer to the user manual supplied
with the rack the Liebert XDR is mounted on.
Liebert XDR
Front
of
Rack
Rear
of
Rack
Refrigerant
Connections
Critical
Equipment
Enclosure /Rack
Shown from Side