What does the car air conditioner's internal and external circulation mean?
1 Answers
Introduction to the meaning of car air conditioner's internal and external circulation: 1. Internal circulation: It means allowing air to circulate only inside the car, driven by the blower to cycle the air within the vehicle. 2. External circulation: It connects the inside of the car with the outside. While driving, airflow automatically draws in outside air due to wind pressure. When stationary, outside air can still enter the blower through the air ducts and be blown into the car. Below are the situations when to use internal and external circulation: Using external circulation: 1. For a newly purchased car, it is essential to open the external circulation as much as possible to maintain air flow between the inside and outside of the car. This helps in quickly releasing harmful gases from the car. 2. During long highway drives, keeping the internal circulation on for too long can lead to insufficient oxygen inside the car, causing driver fatigue and potential traffic accidents. In such cases, opening the external circulation is necessary to replenish fresh air inside the car. 3. When smoking, always open the external circulation to ensure smoke is quickly expelled from the car. Using internal circulation: 1. During traffic jams, always turn on the internal circulation because the more congested the traffic, the higher the density of exhaust fumes in the air. The internal circulation effectively prevents outside exhaust from entering the car, avoiding harm. 2. In dusty or sandy weather conditions, use the internal circulation to prevent outside dust from entering the car and to reduce the impact of sand on the air filter.
