Is it better to use internal circulation or external circulation for air conditioning?

Let's talk about the difference between internal circulation and external circulation.

External circulation-supplement fresh air

Internal circulation blocks dirty gas.

In the external circulation state, the air outside the car is sucked into the car by the fan, that is to say, the air passages inside and outside the car are circulating, and the air of the fan comes from outside the car. Even if the fan is not turned on, the airflow will still be sucked into the car during driving to replenish the fresh air in the car.

In the state of internal circulation, the airflow channels inside and outside the car are closed, so there is no airflow circulation without turning on the fan, and the airflow inhaled when turning on the fan only comes from the car, forming airflow circulation inside the car. Internal circulation is mainly to prevent dust and harmful gases from entering the car in foggy days, such as when driving through areas with dust and odor or when vehicles are dense and compact, to block the harmful exhaust gas of the preceding car.

Generally, when we turn on the air conditioning system of cold air or warm air, we can turn on the internal circulation first to make the temperature in the car drop or rise rapidly; After the temperature is stable, properly switch to the external circulation to exchange air with the outside of the vehicle.

However, there are two extreme situations here, outdoor exposure and extreme cold. Here's a brief introduction: If your car is exposed to the sun outdoors for a long time, it's like taking a sauna in the car. After getting on the bus, it is best to open the external circulation for ventilation and heat dissipation, and at the same time, you can open the window and skylight to speed up heat dissipation, so that the temperature inside the car is basically balanced after 3-5 minutes. Then close the window, turn on the refrigeration, and turn on /[/K0.

In the extremely cold winter, the heating is not in a hurry. When the engine temperature reaches the normal position, the heating internal circulation can be turned on to quickly raise the temperature.

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