Emerson XDR user manual Airflow, Generic airflow diagram

Mechanical Considerations

4.3Airflow

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

Enclosure /Rack

Shown from Side

Refrigerant

Connections

Liebert XDR

Critical

Equipment

Front

of

Rack

Rear

of

Rack

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.

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.

11