Valeooscope - Air Conditioning System Thermal comfort loop

9. The Heating Ventilation and Air Conditioning unit (HVAC)

9.6 Filtering particles suspended in the air

The air conditioning system is exposed to large quantities of exhaust gases, soot, dust particles, pollen and allergens. Pollutants and particles must be trapped before air enters the cabin. < 1 µm > 10 µm - 1 µm The largest particles (leaves, insects, etc.) are captured by the air inlet grille, which has a mesh measuring a few millimeters and acts as a preliminary filter. The smaller the particle size the higher the risk for the occupants, particles smaller than 2.5µm are the most dangerous. A cabin filter is built into the air conditioning system to trap those particles. > 10 µm - Heavy dust / Sand - Pollen - Dust - Diesel particles - Ashes - Bacterias - Smoke / Smog / Soot - Allergens - Gaseous contaminants

The cabin air filter functions :

1. Car occupant’s protection g Cleans the air from particles, gas, allergens, pollution 2. A/C system optimum functionality g Prevents from contamination of the heating and A/C system g Ensures maximum performances to the system g Prevents the soiling of the windows for a better visibility

PROTECTS AGAINST

harmful particles (pollen, dust, spores, ashes, bacteria, soot,...)

harmful gases (ozone, nitrogen dioxide, toluene, butane, sulfur dioxide,...)

unpleasant odours

entrance of the inhalation allergen into the cabin (allergen neutralization)

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