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9.1 Air circulation
Air is the main component of an HVAC circuit.
9.2 Capturing the outdoor air
The outdoor air enters the cabin through an air inlet
between the windscreen and the bonnet, in a part of
the bodywork known as the water separator that acts
as a seal between the air conditioning system and
the bodywork.
The air inlet is protected by a vent grill that prevents
foreign bodies - leaves, insects, debris or even small
animals - from entering the system.
The air inlet is located in a zone that is insensitive to
dynamic pressure. The cross section must be large
enough to avoid excessive loss of head. The hot air
that is warmed by the bonnet or comes from the
engine compartment must not be drawn in, and the
path of the air must not disrupt the air flow at the
blower inlet.
9. The Heating
Ventilation and
Air Conditioning
unit (HVAC)
20
9.3 Extracting the air
from the cabin
The air inside the cabin must be renewed. Once
it has been captured and treated, the air must be
expelled by extractors.
Outdoor air inlet
Air circulation in the cabin
Air circulation and extraction
Air re-circulation