What is the difference between the internal and external air circulation modes in Tesla's air conditioning system?
3 Answers
Tesla's air conditioning system has two air circulation modes: internal and external. The differences between them are: 1. Different states: In the internal circulation mode, the airflow channel between the inside and outside of the car is closed, and there is no air circulation without the fan; In the external circulation mode, the fan draws air from outside the car into the interior. 2. Different functions: The internal circulation mode mainly prevents external dust and harmful gases from entering the car in a timely and effective manner; The external circulation mode allows you to breathe fresh air from outside the car. 3. Different usage scenarios: When driving in the city, especially during rush hour traffic jams or in tunnels, it is recommended to use the internal circulation mode; When driving on highways, the external circulation mode should be used.
I think understanding the difference between recirculation and fresh air modes is crucial when using the air conditioning in a Tesla. Recirculation mode closes the windows and only circulates the air inside the car, essentially breathing the same air you exhale. This is particularly useful in summer to cool down the cabin quickly, or when passing through tunnels or areas with poor air quality, as it keeps pollutants out. However, prolonged use can make the air feel stuffy and stale. Fresh air mode, on the other hand, opens a vent at the front of the car to draw in outside air, which is then purified through a high-efficiency particulate air (HEPA) filter before being blown into the cabin. Tesla's 'Bioweapon Defense Mode' essentially maximizes the fresh air mode's power, ensuring clean air regardless of how polluted the outside air is. So, in general, use recirculation mode when stuck in traffic, passing through tunnels, or when you first get in the car to cool it down quickly. On highways or when the cabin feels stuffy after prolonged use, switch to fresh air mode or auto mode to improve air circulation.
When you actually drive a Tesla, you'll notice a significant difference between the effects of air recirculation and fresh air mode. The recirculation mode is a closed-loop system that completely isolates the outside air. In this mode, the air conditioning cools most efficiently, especially when you get into a car that's been baking in the summer sun—set the temperature to the lowest, turn on recirculation, and cool air rushes in immediately. However, the downside is that prolonged use traps moisture and carbon dioxide from breathing inside the car, leading to foggy windshields and stuffy air. Fresh air mode is much more comfortable, as it continuously brings in outside air, effectively like driving with windows down for ventilation while the AC still works normally. But if you encounter dusty construction sites or heavy traffic with exhaust fumes, it's better to switch back to recirculation. Another tip: Always use recirculation during automatic car washes or when idling for long periods (like waiting for someone), otherwise exhaust fumes can seep in from the front of the car, which smells awful.
