How does evaporator-for-light-vehicles dehumidify?

The dehumidification process in an evaporator for light vehicles is an integral part of the air conditioning (A/C) system. Here's how the evaporator contributes to dehumidifying the air inside a vehicle:

Warm Air Entry:

The process begins with warm air from the vehicle's interior being drawn into the A/C system. This warm air typically contains moisture (water vapor) in the form of humidity.

Evaporator Coil Operation:

The warm air is directed over the evaporator coils, which are kept at a lower temperature. The evaporator is located inside the vehicle, often near the dashboard.

Cooling of Air:

As the warm air passes over the cold surface of the evaporator coils, the refrigerant inside the coils absorbs heat from the air. This heat absorption causes the air temperature to drop significantly.

Condensation of Moisture:

Simultaneously, the drop in temperature of the evaporator coils causes moisture (water vapor) in the warm air to condense into liquid water. The water droplets form on the cold surface of the coils.

Water Removal:

The condensed water is collected on the evaporator coils and typically drains away. In some systems, a drain pan or a system of channels is designed to collect and direct the water out of the vehicle, preventing it from entering the interior.

Dehumidified Air Exit:

The air that has been cooled and dehumidified by the evaporator is then directed back into the vehicle's interior through the HVAC (Heating, Ventilation, and Air Conditioning) system ducts.

Improved Comfort:

The dehumidified air provides improved comfort to the occupants by reducing the feeling of stickiness that is associated with high humidity. It also helps prevent fogging on windows.

Continuous Cycle:

The entire process is cyclical and repeats as long as the A/C system is operational. The refrigerant circulates through the A/C system, cycling between the compressor, condenser, expansion valve (or orifice tube), and evaporator.

Humidity Control:

The evaporator, by removing moisture from the air, contributes to controlling the humidity levels inside the vehicle. This is particularly important for creating a comfortable and pleasant environment for occupants.

In summary, the dehumidification process in an evaporator for light vehicles occurs as warm air is cooled by passing over the cold evaporator coils. The cooling causes the moisture in the air to condense into liquid water, which is then removed from the system. The result is dehumidified air that contributes to a more comfortable and enjoyable driving experience.