Emerson user manual Environmental Control, Heat Removal-Self-Contained, Air Cooled XDF

XDF Components

3.1.5Environmental Control

The XDF supplies cooling air—68°F to 77°F (20-25°C)—to electronic equipment in the rack-mount equipment compartment.

In normal operation, six fans at the right front corner of the XDF circulate cooling air through the equipment compartment. The laterally circulating air absorbs heat generated by the electronic equip- ment and transfers the heat to an evaporator coil at the right rear of the XDF. The heat is removed differently in the self-contained, air cooled and water/glycol cooled units.

Heat Removal—Self-Contained, Air Cooled XDF

Heat removed from the self-contained, air cooled XDF cabinet is transferred to condenser coils at the top of the XDF, in a section separated from the equipment compartment. The condenser fan on top of the self-contained, air cooled XDF draws ambient air through the condenser coils and exhausts the heat-laden air into the room.

Heat Removal—Water/Glycol Cooled XDF

The water/glycol cooled XDF transfers the heat captured by the evaporator coil to a brazed plate con- denser at the top of the unit, also separate from the equipment compartment. That heat is then car- ried away by the cooling water or glycol to a condenser or drycooler.

Figure 7 Cooling system components—self-contained, air cooled models

Condenser Fan Condenser Coil

Condenser Air

Intake Vent for

Normal Operation

Backup Ventilation Intake Vent (exhaust vent is on rear)

Evaporator Coil (behind damper) extracts heat from circulated air

Front Rear

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