1, internal loop
Internal circulation is to circulate the air in the car when it is closed. This icon is a circular arrow in a closed car.
2. External circulation
External circulation is to let the air outside the car flow into the car. The icon is a convertible with an air arrow pointing inward.
Compared with the internal circulation, the biggest feature of the external circulation of automobile air conditioner is that it can keep the air inside the car fresh (especially where the air outside the car is better). Because the external circulation is that the blower sucks air from the outside of the car and blows it into the car. Because of this feature, the refrigeration effect of external circulation is not obvious.
Extended data:
recycle
The new car you just bought must open the external attack cycle as much as possible to keep the air circulation inside and outside the car, so that the harmful gases in the car can be volatilized and released as soon as possible. In addition, when driving at high speed for a long time, if the internal circulation is maintained all the time, it is easy to cause insufficient oxygen in the car, which will lead to fatigue driving and traffic accidents.
At this time, it is necessary to open the external circulation to supplement the fresh air in the car. When smoking, you must also open the external circulation, so as to ensure that the smoke can be quickly discharged from the car. This is not only responsible for your own health, but also can make the family in the car less endangered by second-hand smoke. However, it is best not to smoke in the car. After all, the space is too small to release secondhand smoke in time.
We are basically in the state of internal circulation in daily driving, but we should pay special attention to these situations. When there is a traffic jam, the internal circulation must be turned on, because the more congested the air is, the greater the tail gas density is. At this time, internal circulation can effectively prevent exhaust gas from entering the car and avoid causing harm to us.
When you encounter sandstorms and dust on the road, you must turn on the internal circulation, which can not only prevent dust from entering the car, but also reduce the impact of sandstorms on air conditioning filter elements.