I believe everyone is familiar with air conditioning. With the development of economy and the improvement of people's living standards, every household has installed air conditioning. In hot summer, we need to use air conditioning to cool down, which can make us feel cool; The temperature is relatively low in winter. Turning on the air conditioner can improve the indoor temperature and make people feel warm. What's the difference between cooling and heating?
From the working principle of the air conditioner, when the air conditioner cools, the compressor compresses the vaporized refrigerant in the pipeline by relying on the power of the motor. At this time, the temperature of the compressed gas rises, and the high-temperature refrigerant will raise the temperature of the condenser of the outdoor unit.
At this time, the condenser is blown by the fan of the outdoor unit to dissipate heat, and the temperature of the condenser begins to drop. The heat contained in the refrigerant is radiated into the outdoor air, and the refrigerant itself is cooled into liquid and enters the indoor unit through the pipeline.
The indoor unit has a component called expansion valve, which is a device that can rapidly expand the volume of refrigerant. When the refrigerant passes through the expansion valve, the volume of the refrigerant expands rapidly. At this time, the temperature of the refrigerant will also drop, which will reduce the temperature of the evaporator.
The fan of the indoor unit blows out the air through the evaporator, and the air is quickly cooled by the cold evaporator, so we will feel the cool air from the air conditioner. At the same time, the evaporator absorbs the indoor heat, the temperature rises, the refrigerant changes from liquid to gas, and then is sent to the outdoor unit to continue compression, which goes back and forth.
From the above process, it can be seen that the working principle of air conditioning refrigeration is to 'transport' indoor heat to the outdoor through refrigerant. On the contrary, the heating process is to 'transport' outdoor heat to the indoor. This transport process is the famous' reverse Carnot cycle '.
Of course, for heating, sometimes in order to make up for the problem of low outdoor temperature and insufficient handling heat, electric heating wires will be installed inside the air conditioner for auxiliary heating, plus the external heat from 'handling', so as to enhance the heating effect.
If the indoor temperature is 20 ℃ and the refrigeration is turned on for 26 ℃, the blown air is cold air. However, the air conditioner will stop working for a period of time because the sensing system of the air conditioner has tested that the indoor temperature is lower than 26 ℃; If the indoor temperature is 20 ℃ and the heating is 26 ℃, the wind blown out is hot air. The air conditioning induction system will stop working after the indoor temperature reaches 26 ℃.
To put it bluntly, no matter what the room temperature is, as long as the air conditioner is in the cooling mode and in the working state, the wind blown out is cold air, and the air conditioner is in the heating mode and in the working state, the wind blown out is hot air. The temperature of the blowing air is determined by the operation mode of the air conditioner. The indoor temperature and setting procedure determine the operation mode of the air conditioner, not the direct blowing temperature.