Inner or outer circulation? It's the bigger thing, so let's explain it from a fart perspective. Use it right, don't smell the fart, use it wrong is nothing more than being smoked, the reason why it is not a big deal is because I have not heard that several people are smoked by the fart.
High-speed does not open the external circulation is certainly wrong, but some of the knowledge and skills used in air conditioning, there are really many old drivers do not know, we also expand this problem, such as: how to operate the fog removal in the car? Do I need to open the A/C button for warm air in winter? I understand it after reading it.
First, open the inner cycle or the outer cycle, see whether the "fart" is in the car or outside the car.
The concept of internal and external circulation is easy to understand, in fact, the icon on the button has been drawn very clearly, and the inner cycle is "closing the window" and isolating the outside world, relatively closed. The air outside can't come in, and the air inside the car can't go out. The outer loop is the opposite, that is, "opening the window". Outside air can come in, and the air inside the car can also be discharged.
Want to know when to open the outer loop, when to open the inner loop, it is very simple, you look for where the "fart" is? Fart in the car, do you have to open the window for ventilation? That's right, the outer loop! Unless you're going to filter out this fart with your own respiratory system. If the fart is on the outside, then use the inner loop, and no one wants to open the window to smell the fart, right?
Pretty easy to understand, right? But that's not all, you still have to know, what is a "fart"! This is just a metaphor, in fact, this refers to unclean, polluted air. In other words, you have to look inside the car, outside the car, where the air is clean.
1, in general, the natural air is fresher and cleaner, so we drive, most of the time should use external circulation. After all, the people in the car are breathing, the carbon dioxide concentration will increase, and there will be a feeling of suffocation without ventilation for a long time, which may even lead to dizziness, fatigue, and mental atrophy, increasing the probability of accidents.
2. What if it is a smog day? Or you pass by a chemical plant, a crematorium, there is a smell in the air, it is obviously fart outside, there is something inside the car, switch the inner cycle, and then close the car window, the sunroof.
3, parking, traffic jam switching short time to switch the internal cycle, but also because there is a "fart" outside, that is, other people's car exhaust. There are many vehicles, all idling and waiting, and the exhaust gas is more concentrated. Many models have also added similar functions, parking automatic switching internal circulation, when encountered, you do not compete with the system.
4, if the inside and outside are farts, the smog outside is serious, and the co-driver in the car also takes off his shoes... The lesser of two evils is the case, and at this time it is still the outer circle. Many high-end models have an on-board PM2.5 filtration system, even if not, the air coming in from the outside is also going to enter the air conditioning filter, and more or less will have a certain filtration effect. As long as the outside is not a gas, the external circulation is better.
5, stop and turn on the air conditioner to sleep, open the internal cycle or the outer cycle? Do you know why it's bold? If you make a mistake, you will really be killed. Ten years ago, Beidaihe almost every year because there was no room, sleeping in the car to sleep in the past! The internal circulation must not work, the concentration of carbon dioxide increases, and the external circulation is not necessarily fine. If in a relatively closed place like the garage, the air circulation is poor, even if it is an external circulation, you are sucking in your own car exhaust. Parking is used in ventilated areas with external circulation.
Second, open the inner cycle or the outer cycle, see if you want to be cold or hot
It's easy to divide it according to air quality, but there is another factor that affects our judgment, and that is temperature. There is air conditioning in the car, it is cold outside, the inside of the car is warm, the air is hot, on the contrary, in the summer, we are cool inside the car and hot outside. If the external circulation is open, the suitable temperature inside the car that makes us feel comfortable will be lost with the air circulation, and the increase in energy consumption will also affect the experience. Therefore, the internal and external circulation should also consider the temperature factor. To put it simply, if you want to maintain the temperature difference between the inside and outside of the car, open the internal circulation, and want to be closer to the temperature outside the car, open the outer circulation.
1, spring and autumn temperature is suitable, you can completely open the window, high-speed window to increase the wind resistance, external circulation ventilation is also a good choice. As long as the outdoor air is fine, there is no need to switch.
2, open the warm air in winter, open the air conditioner in the summer, and open the external circulation all the time to increase energy consumption, so the internal circulation is the mainstay, and occasionally open the external circulation ventilation for a while. The time is not too long, the space in the car is small, and there is a two or three minutes of air that can be circulated once. If it is an automatic air conditioner, don't switch the manual mode, it will switch the internal and external circulation by itself.
3, just get on the car in the summer, even if the outside of the car is more than 30 degrees, it is cooler than the inside of the car, so don't worry about opening the air conditioner, open the window for ventilation first, let the hot air exposed in the car dissipate, and then open the air conditioner consistent with the outside. Not only for fuel saving, the car is exposed to the sun, formaldehyde will volatilize, and the formaldehyde content of this part of the air is very high.
Third, the window defogging
It's listed because a lot of people are doing it wrong. Automatic air conditioners generally have a front window defogging key, when fogging, press it, that is, three or five seconds, the fog will disappear. But...... Just ask you if you are cold? Summer is fine, it is raining outside, open the cold wind does not feel how uncomfortable, if it is autumn rain, it would not be warm, and then a cold wind ... What's even more tragic is that you don't dare to close it, and the window is immediately foggy before closing, which will even affect driving safety. Do you think that's all there is to it in the rain? Actually, you are mistaken.
There are at least three ways to remove fog, press the window defogging key, or manual air conditioning to open the cold air, the maximum air volume blows the front window, all belong to the "cold air defogging". The fastest onset, immediate results, but the disadvantage is... cold.
You open the windows to make the storm a little more intense, the temperature inside and out of the car is the same, and the windows don't fog. The principle of fogging everyone should understand, saying that it is fog, in fact, it is a small droplet of condensed water. The relatively hot water vapor in the car encountered condensation caused by cold glass condensation. So, if you open the outer circulation, ventilation, or simply open the window, the temperature inside and outside the car is the same, and there is no fog. However, this disadvantage is that it is cold and slow.
The third method is to use "warm air to remove fog", the principle of fogging is understood - hot water vapor meets cold car windows, so if you want to remove fog, you either make the air in front of the window cold, or make the window hot. The latter is the principle of using warm air to remove fog. The operation is also very simple, since you feel cold, you open the warm air and it is finished. Do not use the defog key, directly open the warm wind blowing window, and open A/ C, although the window fog will become larger in a short period of time (because the first heating is still the air, the hotter air encounters the cold window, the fog will be thicker) but wait a little while, and the temperature of the window glass also rises, the fog is naturally eliminated, and you are also comfortable. The disadvantage is that it is slow, and there is a period of dense fog during this period, if the road conditions allow, you can find a place to park and wait for a while.
Fourth, about the A/C key
This button is the switch button of the air conditioning compressor, the summer to open the air conditioning will be turned on automatically, if manually turned off, it will not be cool, but become ventilation. Summer refrigeration needless to say, the question is, does the winter heating need to be turned on?
Many old drivers say that the opening of the warm air is to use the residual heat of the engine, without opening the A/C key, it is also reasonable, because the compressor cannot be opened, and it does not affect the blowing of the warm air. However, the correct way to use it is still recommended that you drive, whether it is a fuel car, a hybrid car or a pure tram.
Because the air conditioner has a dehumidification function in addition to the refrigeration function, opening A/C can effectively avoid fogging in the window. Why do you press the window defogging button and the A/C lights up automatically? Just said warm air defogging, why let you turn on A/C? It is to use the dehumidification function of the compressor.
A lot of people get it wrong because it's a bit counterintuitive. I want to turn on the warm air, and the A/C is cooled, isn't it the pool inlet pipe and the drain pipe that are open at the same time? In fact, it is not, just like your faucet, if you want to produce hot air, the air conditioner cannot enter the car. And the refrigeration and temperature difference are related, the outside is already very cold, even if you turn on the cold air, the power is very small. Now most of the models are variable displacement compressors, to put it bluntly, it is a frequency conversion air conditioner, and the power of the dehumidifier is only open A/C, which is almost negligible. Even the old-fashioned fixed displacement compressor is on and off, and the energy consumption will not be much higher.
Finally, turn on the air conditioner, it is best to switch to ventilation a few minutes before parking, because I see that there are bloggers who are wrong, and here is a special correction. This point is beyond doubt, many car manuals have emphasized, can effectively avoid air conditioning odor. The blogger said it would take a few minutes to blow dry, but that's not the case. Opening the wind is not to dry the water droplets in the air conditioning pipeline, the water droplets are formed after you turn off the air conditioning, the water vapor in the air meets the condensation of the cold pipeline. Ventilation only reduces the humidity in the pipeline, while increasing the temperature, the temperature in the pipeline is consistent with the outside temperature, even if there is a small amount of water vapor will not condense. In fact, the time to change the ventilation does not need to be too long, after entering the community, turn off A/C to ventilation, and you park the car this kung fu is enough.