What does the car's internal circulation mean?
2 Answers
The internal circulation of a car refers to the process where the air inside the vehicle is heated or cooled and then recirculated back into the cabin. Below is a related introduction about internal circulation: 1. Principle: Car air conditioning systems generally have an electric or manual switch for internal and external circulation. When external circulation is used, the air conditioning draws air from outside the car, while internal circulation reuses the air inside the vehicle. If the air conditioning internal/external circulation switch is a mechanical lever instead of a button, the lever can be placed in the middle position between internal and external circulation, allowing an appropriate amount of outdoor air to enter. This improves air quality while enhancing the air conditioning effect. 2. Advantages: Internal circulation primarily helps to promptly and effectively prevent external dust and harmful gases from entering the cabin, such as when driving through areas with smoke, dust, unpleasant odors, or in heavy traffic, blocking harmful exhaust emissions from vehicles ahead. Internal circulation can improve the cooling and heating efficiency of the air conditioning system and provides better insulation.
The interior recirculation is activated by pressing the button with the car icon on the AC panel, which stops the AC system from drawing air from outside and instead recirculates the air inside the car. After driving for ten years, I've found this feature most practical in traffic jams to avoid inhaling exhaust fumes from the car ahead, and also in quickly cooling down the car after it's been baking in the summer sun. However, don't keep it on all the time—prolonged lack of fresh air can cause dizziness. I usually switch back to exterior circulation after half an hour to get some fresh air. It's also useful in winter for defogging when paired with warm air, but remember to switch to exterior circulation when fogging is severe for faster dehumidification.
