Valeooscope - Air Conditioning - AC System Thermal comfort l

The air extractors are made up of rubber membranes

that act as valves. They open to let the air out of

the cabin, then close again when the vehicle is at a

standstill to prevent the outdoor humidity from ente-

ring the cabin.

Air extractors can be located:

At the rear of the vehicle (behind the bumpers)

In the wheel arches

In the bodywork at the rear (in the quarter lights)

In the centre pillar (on some 3 door hatchback

applications)

9.4. Re-circulating the air

We have already seen that the air inside the cabin

must be renewed. However, under certain condi-

tions it may be important to isolate the cabin from

any ingress of air from the outside. This is what the

re-circulation system does.

The re-circulation status can be fully open, fully

closed or a mix between fresh and internal cabin air.

But the re-circulation can only be used for a limited

length of time, or the windows may mist up and the

occupants may suffer from a dry throat and eyes.

On automatic A/C systems the re-circulation flap is

controlled by an actuator.

For maximum comfort the re-circulation function

can be combined with an Air Quality Sensor.

The re-circulation actuation must be very reactive to

avoid pollution entering the cabin.

The recycling function

is located just after the HVAC air inlet

Re-circulation consists of reusing the air inside the

cabin while preventing any outside air from entering

the cabin.

The role of the re-circulation system is to:

Allow the occupants to isolate themselves from

the outside when in polluted environments

Quickly converge towards conditions of thermal

comfort when starting the system (this last feature

is generally not known by end users)

The re-circulation flap

Air exhausters