How to use the internal and external circulation of the car?
When driving through dusty construction roads, you can smell the dirt when sitting in the car. What should you do if you want to keep the dust out of the car? What should I do if I drive out in the hot weather of 36℃ and the air conditioner in the car is adjusted to the lowest, but I still feel very hot? At this time, it is necessary to flexibly use the internal and external circulation of the car.
Although the function of internal and external circulation is negligible, how to use it in practice and what is the specific situation? The external circulation state is to suck the air outside the car into the car with a fan. In other words, the air passages outside and inside the car are round, and the wind from the fan sucks the airflow into the car to supplement the fresh air inside the car.
There is still wind when the fan is turned off, because the owner has set up external circulation. When driving in the city, the car will be full of exhaust fumes when it is congested. This is why an outer loop is used. In the state of internal circulation, the airflow channel inside and outside the car is closed. If the fan is not turned on, there will be no air flow.
The main purpose of internal circulation is to prevent external dust and harmful gases from entering the vehicle in time and effectively, such as blocking the harmful tail gas emitted by the preceding vehicle when passing through the smog, dust, odor area or crowded vehicles. Another function is insulation. Many models have automatic air conditioning, which can automatically adjust the internal and external circulation.
For example, in some Mercedes-Benz cars, the air conditioning system will automatically switch to the external circulation after switching to the internal circulation mode for 5 minutes. Generally, BMW air conditioners have preset external circulation, and then there are two gears of forced internal circulation and automatic circulation, which can meet the needs of different drivers and different weather conditions.
In fact, there is little knowledge in turning on the air conditioner. Proper use of air conditioning can not only cool or heat at the fastest speed, but also save fuel and alternate external circulation. If the external circulation can't be used all the time, turn off the air conditioner about one minute before turning off the engine, turn on the external circulation to reduce the internal humidity, and remove the evaporation box, which can effectively avoid the engine. It smells when the air conditioner is turned on. It is forbidden to use external circulation when the car is parked in the same place and too close to the opposite side.
Because it will suck a lot of carbon dioxide and carbon monoxide into the car, and its harm is the same as gas poisoning. When driving at high speed for a long time, if the internal circulation is maintained, it is easy to cause insufficient oxygen in the car.
Drivers are tired and traffic accidents happen from time to time. At this time, it is necessary to open the external circulation to supplement the fresh air in the car. Of course, when smoking, you must also open the external circulation to ensure that the smoke can be quickly discharged from the car. This is not only responsible for your own health, but also reduces the harm of second-hand smoke to your family in the car.
However, it is best not to smoke in the car. After all, the space is too small to release secondhand smoke in time. As for the long-term use of internal circulation, will it lead to turbid air and poor quality in the car? First of all, there are many gaps in the car body that are invisible to the naked eye, which makes it impossible to achieve real air tightness in the car, so it will not cause hypoxia! Automobile air conditioning can be divided into three modes: forced internal circulation, forced external circulation and automatic. Even if the internal circulation is switched, the external air circulation will only be stopped within 10 minutes.
The internal loop continues. When it exceeds 10 minute, the external circulation of 10% will be automatically maintained, which is the operation logic of automobile air conditioner. Car companies are completely designed in this way, the purpose is not to keep out the wind, and the quality of cars is getting worse and worse. Generally speaking, if you want to release fresh air, you must turn on the external circulation, and if you want to block dirty air, you must turn on the internal circulation, such as driving at high speed for a long time. It's better to turn on the external circulation. This can keep the air in the car fresh, and people are not prone to dizziness and chest tightness. When the air conditioner is turned on to blow hot/cold air, it is best to turn on the internal circulation to avoid exchange with outdoor air, and turn on the air conditioner at the air interface.