A/C is not needed to turn on the air conditioner. Please refer to the paper in Refrigeration and Air Conditioning. According to the analysis of the heating mode of automobile air conditioning, traditional automobile heating air conditioning mostly adopts water heating system.
That is, let the engine coolant flow into the heat exchanger, and then use the blower to blow the heated air into the compartment.
The reason is the same as the hair dryer. The hair dryer is "gurgling", in which the heating wire heats up first.
When the air passes by, the air is also hot. Just blow it out.
The heat of car heating and air conditioning is equivalent to hot coolant, and the engine burned, right?
In this process, A/C didn't actually play a role.
This key we often talk about is actually used to control the compressor of air conditioner and to cool it.
There is also a paper "Detailed explanation of the structure and working principle of automobile air-conditioning compressor (I)" in the magazine of Automobile Repair and Maintenance.
Air-conditioning compressor promotes the circulation of refrigerant in the system, thus achieving the purpose of air-conditioning refrigeration.
Therefore, it is not necessary to turn on the warm air when turning on the air conditioner in winter, and it may cost oil to turn it on.
Why can I still blow warm air when I turn on the air conditioner? At this time, some friends will ask, since the air conditioner is used for refrigeration, why is the wind still warm when I turn on the air conditioner?
The temperature adjustment of automobile air conditioner is mixed, which is explained in the maintenance manual of Dongfeng Citroen Seine River.
The automobile air conditioner is adjusted according to the temperature and flow rate, and the required temperature is obtained by driving the air mixing door by stepping motor to mix hot and cold air.
Warm air is provided by the coolant exchanger of the engine, cold air is provided by the evaporator of the refrigeration system, and the airflow is blown by the blower anyway.
That's what the dialect says: you turn on the air conditioner, and at the same time, there is an A/C on. In the air conditioning system, there are both warm air and cold air.
It's just that the temperature of the air entering the carriage is the result of neutralization, and how many degrees the air conditioner is turned on is only a few degrees.
It's a bit like: cold water mixed with hot water becomes warm water, something like this.
What's the use of turning on the air conditioner when heating? It is not easy to fog when the air conditioner is turned on. "Isn't it stupid to listen to this?" I want to be hot and mixed with cold. What am I doing? "
That's not true. It's not useless to turn on the air conditioner when blowing warm air. Turning on the air conditioner in winter can keep the car dry, and the window won't fog, will it?
As we know, the fog on the window is actually the fog formed after the water vapor in the air inside the car meets the cold glass and liquefies.
There is also a paper in Science and Fortune magazine, "Talking about the Use and Maintenance of Automobile Air Conditioning and Refrigeration System", which says.
In addition to the refrigeration function, the automobile air conditioning refrigeration system also plays the role of dehumidification, and also helps to remove the visual obstacles such as frost and condensed water mist on the inner surface of the window.
In principle, there is a link in the process of air conditioning refrigeration that the evaporator absorbs heat to reduce the ambient temperature.
When the air touches the cold evaporator, it will adhere to the evaporator and condense into water droplets, and the humidity in the air will decrease.
Just like our air conditioner, it can dehumidify.
Speaking of which, friends may understand that you think the windows are foggy in winter. Press the defogging button, and you will find that the air conditioner automatically lights up or turns on. That's the reason.
In fact, many friends have not carefully thought about this realization principle. In fact, it is like this:
When the wind blows, the water droplets on the glass are heated first, making them evaporate into gas, but the gas, water, is still there, right?
Another dehumidification of A/C is equivalent to that the water on the glass turns into water vapor, and the water vapor is pumped away by A/C, thus achieving the purpose that our front windshield looks clear.
So you shouldn't think it's stupid to mix hot and cold. It's too expensive or stupid to add a quota, right?
Turning on the air conditioner occasionally can ensure the normal operation of the air conditioning system. In addition, turning on the air conditioner occasionally has a certain maintenance effect on the air conditioning system.
In addition to refrigerant, there is refrigerant oil in the compressor, which is used to lubricate the internal parts of the compressor, just like engine oil.
There is a paper in Refrigeration and Air Conditioning (Sichuan) magazine, which mentioned the analysis and elimination of common faults of automobile air conditioning compressor.
Starting the compressor occasionally can drive the refrigerating machine oil to lubricate the relevant shaft seal through the circulation of refrigerant, so as to prevent the seal from drying up and avoid the phenomenon of "cold welding" in each rotating part.
It's welding, not sweating.
When the compressor does not run for a long time, corrosion spots are easy to form on the mating surface of the rotating parts, which affects the accuracy and surface quality of the rotating parts.
To be honest, if the air conditioner is not turned on for a long time, it may cause additional wear and even failure of the compressor when restarting.
Therefore, it is best to start the air conditioning compressor once every two weeks for at least 5 minutes at a time.
I'm just saying it's best not to open it. It won't explode.
Generally speaking, there is no need to turn on the air conditioner button in winter, because there is no need to turn on the air conditioner button for heating.
However, if the temperature difference between the inside and outside of the car is large in rainy days, it is possible to prevent fog by turning on the air conditioner just after defogging.
Then, driving every two weeks also has a certain maintenance effect, which is better for your car.