What is the function of turning on the car's internal circulation?
2 Answers
The fan inside the car has two usage states: external circulation and internal circulation, which are switched by a toggle switch. The function of internal circulation is to maintain warmth. The specific details are as follows: 1. External circulation: In the external circulation state, the fan draws air from outside the car into the interior, creating a flow of air between the outside and inside of the car. The air blown by the fan comes from outside the car. Even if the fan is not turned on, there is still airflow entering the car while driving, replenishing fresh air inside. Sometimes, you may feel there is still airflow even when the fan is turned off, which is because the owner has set the system to external circulation. When driving in the city and encountering traffic congestion, the car may be filled with exhaust fumes, which is caused by using external circulation. 2. Internal circulation: In the internal circulation state, the airflow passage between the inside and outside of the car is closed. Without the fan, there is no airflow circulation, and when the fan is turned on, the airflow drawn in comes only from inside the car, creating an internal airflow circulation within the vehicle. Internal circulation primarily serves to promptly and effectively prevent external dust and harmful gases from entering the car, such as when driving through areas with smoke, dust, unpleasant odors, or when vehicles are driving closely together, blocking harmful exhaust emissions from the vehicle ahead. Another function is to maintain warmth.
I often use the recirculation function when commuting to and from work. Its main purpose is to prevent outside air from entering the car, allowing only the air inside to circulate. This helps avoid inhaling exhaust fumes, smoke, or unpleasant odors during city traffic jams, especially in congested areas where it makes breathing feel cleaner. Additionally, the air conditioning operates more efficiently, cooling faster since it doesn't have to process hot outside air, saving fuel and electricity costs. I've also noticed that interior noise is reduced, making music sound clearer. However, it's important not to keep it on for too long, as the air can become stuffy and stale. Periodically switching back to fresh air mode for ventilation is advisable. This feature has proven very practical for my daily commute.
