The working principle of steam compression refrigeration system of automobile air conditioning
The working principle of steam compression refrigeration system of automobile air conditioning mainly includes four basic processes: compression process, condensation process, expansion process and evaporation process.
compression process : The compressor inhales the low temperature and low pressure gaseous refrigerant on the low pressure side of the evaporator, compresses it into high temperature and high pressure gaseous refrigerant, and then sends it to the condenser for cooling. This process increases the temperature and pressure of the refrigerant .
condensation process : the high-temperature and high-pressure gaseous refrigerant is dissipated by the fan and the wind generated by the vehicle in the condenser, and condensed into liquid refrigerant at medium temperature and high pressure. The role of the condenser is to transfer the heat of the refrigerant to the external environment to cool it .
expansion process : When the liquid refrigerant passes through the expansion valve or throttle tube, the pressure and temperature drop sharply and become low temperature and low pressure wet vapor. This process causes part of the refrigerant to evaporate, forming a gas-liquid mixture ready to absorb heat .
evaporation process : the gas-liquid mixture of refrigerant enters the evaporator, absorbs the heat in the carriage, and evaporates into low-temperature and low-pressure gaseous refrigerant. The evaporator is an efficient heat exchanger, which takes away the heat absorbed by the refrigerant in the evaporation process from the carriage through the internal pipe, so as to achieve the cooling effect .
The components of an automobile air conditioning steam compression refrigeration system include a compressor, a condenser, an expansion valve (or throttle tube), an evaporator and corresponding control elements. Together, these components form a closed circulation system in which the refrigerant flows continuously, completing the transition from gas to liquid to gas .
The application scenario of steam compression refrigeration system of automobile air conditioning is mainly the internal air conditioning system of automobile. Through this system, the car air conditioning can effectively reduce the temperature in the carriage and provide a comfortable driving environment.
automobile air conditioning steam compression refrigeration system is a device which uses refrigerant to circulate in the system for heat exchange, mainly used to reduce the temperature in the car. The system mainly consists of the following parts: compressor, condenser, expansion valve, evaporator and the pipes and valves connecting these parts.
Working principle
compression process : The compressor inhales the low temperature and low pressure gaseous refrigerant in the evaporator, compresses it into high temperature and high pressure gaseous refrigerant, and then sends it to the condenser for cooling.
condensation process : high temperature and high pressure gaseous refrigerant in the condenser to cooling medium (usually air or water) to release heat, condensing into a liquid refrigerant.
expansion process : When the liquid refrigerant passes through the expansion valve, the pressure and temperature decrease and become low temperature and low pressure wet vapor.
evaporation process : low temperature and low pressure wet vapor into the evaporator, absorbs the heat in the car, evaporates into gaseous refrigerant, and then is inhaled again by the compressor to complete a refrigeration cycle .
refrigerant
A common refrigerant is R-134a (tetrafluoroethane), which absorbs a lot of heat when it is converted from liquid to gas in the evaporator, resulting in cooling .
Historical background and technological development
The basic principle of the automobile air conditioning refrigeration system is similar to that of the household air conditioning, which uses the change of the state of the refrigerant to achieve refrigeration. With the development of technology, modern automotive air conditioning systems are also equipped with a variety of sensors and control systems to achieve more precise temperature control and more efficient energy utilization .
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