What do the inner circulation and outer circulation of car air conditioning mean?
3 Answers
The meanings of the inner circulation and outer circulation of car air conditioning are: 1. Inner circulation allows air to circulate only inside the car, driven by the blower to cycle the air within the vehicle; 2. Outer circulation connects the inside of the car with the outside. While the car is moving, airflow uses wind pressure to automatically draw air into the car, and when stationary, outside air can also enter the blower through the air ducts, then blown into the car. Car air conditioning is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car cabin to an optimal state, providing a comfortable riding environment for passengers and reducing travel fatigue. Whether to use inner circulation or outer circulation in car air conditioning depends on different situations: 1. When the outside air quality is poor, to prevent harmful gases from entering the cabin, it is necessary to set it to inner circulation; 2. During long-distance high-speed driving, to prevent the reduction of oxygen levels inside the car, it is advisable to alternate between inner and outer circulation.
The car's air conditioning recirculation mode refers to the system using only the air inside your car to circulate, without drawing in fresh air from outside. I use this function every day during my commute, especially in traffic jams or areas with severe air pollution, such as city centers, to avoid inhaling exhaust fumes and dust. It also cools the car faster, making it much more comfortable in the summer. However, remember not to keep it on all the time, as prolonged use can increase the carbon dioxide concentration inside the car, making you feel drowsy. The fresh air mode, on the other hand, draws in outside air, which is most effective for defogging, especially during rain or winter. It can clear fogged-up windows in seconds and helps maintain fresh air quality, preventing odors from accumulating. I often switch between recirculation and fresh air modes depending on road conditions to ensure a safer and more comfortable drive. In short, both modes have their uses, and the key is to use them flexibly.
As a commuter who drives to work, I'm particularly environmentally conscious and often think about how to save fuel. The recirculation mode seals the air inside the car for cooling or heating, with the advantage of not requiring the engine to additionally cool the hot air coming from outside, which can save a significant amount of fuel consumption and is more environmentally friendly. The fresh air mode is different—it draws in fresh air from outside, which is healthier but consumes more energy. My experience is to use the fresh air mode in suburban areas with good air quality to breathe fresh air, and switch to recirculation in polluted areas to avoid contamination. Additionally, prolonged use of recirculation may cause the car interior to become dry or develop odors, so I regularly open the windows or use the fresh air mode to ventilate. A handy tip is to use recirculation first in high summer temperatures to cool down faster, while in winter, use the fresh air mode more often to defrost. Simply put, the choice depends on the environment and needs, learning to balance energy savings with health.
