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When driving in rainy weather, fog often appears on the window glass, which brings great interference to the driver's vision and increases the safety hazard of driving. To solve this problem, many drivers will consider using the vehicle's air conditioning system to defog. However, a common question when using air conditioners to defog is whether to choose between internal or external circulation. This question is not a simple yes or no question, it involves the principle of air movement and humidity control, which needs to be decided on a case-by-case basis.
First of all, we need to understand the basic difference between the inner loop and the outer loop. The internal circulation is when the air conditioning system draws air from the interior of the vehicle and circulates it, while the external circulation allows the outside air to enter the vehicle and mix with the air inside the vehicle before treatment. On rainy days, due to the high humidity of the outside air, if the external circulation is turned on, more moisture may be brought into the car, which will aggravate the fogging of the window glass. Therefore, from this point of view, the inner circulation seems to be a better option because it is able to avoid external moisture from entering the car.
However, it's not that simple. If the humidity of the air in the car is also high, it may not be possible to completely solve the problem by relying on internal circulation alone. Because the internal circulation only circulates the air inside the car, if the air inside the car is inherently humid, then the fog will still form quickly. In this case, turning on the external circulation to allow relatively dry air from the outside to enter the car may be more effective in reducing the humidity of the air inside the car, thereby reducing fogging on the windows.
In addition to the choice of internal and external circulation, the temperature and air volume settings of the air conditioner are also very crucial. Generally speaking, setting the air conditioner temperature to a suitable range and increasing the air volume will blow the fog off the windows more quickly. This is because fog is caused by the difference in temperature and humidity between the inside and outside of the vehicle, and increasing the air volume and adjusting the temperature can help balance these differences.
In addition, it is worth mentioning that some vehicles are equipped with a special defogging function, which is usually achieved by directing air to the window glass. When using this function, the driver can choose the internal and external circulation according to the actual situation to achieve the best defogging effect.
To sum up, when driving in rainy days to remove fog, you should decide whether to open the internal circulation or the external circulation according to the air humidity and temperature inside and outside the car and the specific configuration of the vehicle. In general, if the outside air humidity is high, you can try to use internal circulation to avoid external moisture entering the car; If the humidity of the air inside the car is also high, or if you want to remove the fog faster, consider switching to the outer circulation to let the outside dry air into the car. At the same time, reasonable adjustment of the temperature and air volume settings of the air conditioner, as well as the use of the vehicle's defogging function, can also effectively improve the defogging effect.
In practice, the driver also needs to pay attention to the following points: first, when driving in rainy days, keep the windows clean at all times to avoid the dirt in the rain from adhering to the glass and affecting the vision; Secondly, it is necessary to regularly check the air conditioning system of the vehicle to ensure its normal operation and avoid affecting the defogging effect due to system failure; Finally, in the process of driving, we should always pay attention to the road conditions and our own state to avoid safety accidents caused by poor vision or improper operation.
In conclusion, driving in rainy weather defogging is a task that requires a combination of factors. Drivers need to flexibly select the internal and external circulation mode, adjust the air conditioning settings, and effectively remove fog from the windows according to the specific configuration of the vehicle. By using the air conditioning system scientifically and rationally and maintaining good driving habits, we can ensure that we have a clear line of sight and a safe driving environment when driving in rainy weather.