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XDF Components
10
3.1.5 Environmental 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 Air
Intake Vent for
Normal Operation
Condenser Coil
Backup Ventilation Intake
Vent (exhaust vent is on
rear)
RearFront
Condenser Fan
Evaporator Coil (behind
damper) extracts heat
from circulated air