The four processes of the refrigeration cycle of an automotive air conditioner. Indicates the chang

1. Compression process. Gaseous refrigerants at low temperatures and low pressures.

It is sucked in by the compressor and compressed into a refrigerant gas at high temperature and pressure. The main function of this process is compression and pressurization, which consumes mechanical work.

As compensation. During the compression process, the state of the refrigerant does not change, while the temperature and pressure continue to rise, forming a superheated gas.

2. Condensation process. The refrigerant gas is discharged from the compressor and enters the condenser.

This process is characterized by a change in the state of the refrigerant, i.e. a gradual transition from a gaseous to a liquid state with constant pressure and temperature. The condensed refrigerant liquid is in a state of high temperature and high pressure.

3. Throttling and expansion process. The refrigerant liquid at high temperature and pressure passes through the expansion valve.

After throttling and depressurization, it enters the evaporator.

The function of the process is to cool down the refrigerant, adjust the flow, and control the refrigeration capacity, which is characterized by the fact that when the refrigerant passes through the expansion valve, the pressure and temperature drop sharply, and the liquid becomes a low-temperature and low-pressure liquid from a high-temperature and high-pressure liquid.

4. Evaporation process. The refrigerant liquid enters the evaporator after being cooled and depressurized by the expansion valve, and is sucked in by the compressor from the evaporator outlet after endothermic refrigeration. This process is characterized by a change in the state of the refrigerant from a liquid state to a gaseous state, where the pressure does not change.

After throttling, the low-temperature and low-pressure liquid refrigerant continuously absorbs the latent heat of gasification in the evaporator, that is, absorbs the heat and becomes a low-temperature and low-pressure gas, which is sucked in by the compressor and then compressed.

The refrigeration process of an automotive air conditioner.

Car air conditioners are the same as other air conditioners and refrigeration. Bringing the temperature down artificially (or transferring the temperature from a higher object to a lower object) is called "artificial refrigeration", or "refrigeration" for short. Vapor compression recirculating refrigeration (air conditioning) systems are completed through four processes.

That is: throttling process - evaporation process - compression process - condensation process. Throttling, through a throttling device, that is, a throttle valve (also known as a regulating valve or expansion valve, usually called an expansion valve or orifice tube in an automobile air conditioner).

The high-pressure liquid of the refrigerant passes through the narrow channel of the valve to throttle the flow rate and pressure and become a low-pressure liquid into the evaporator, at this time, the flow rate and pressure of the refrigerant have changed, but the form has not changed. Evaporation, through a heat exchange device, i.e. an evaporator. The phenomenon of boiling (vaporization) occurs when a low-pressure liquid is heat exchanged with the heat in the outside world (cab) (i.e., heat transfer, but actually heat absorption).

As a result, the temperature of the space is constantly reduced. Boiling (vaporization) produces a low-pressure refrigerant gas, which changes the form of the refrigerant, but the pressure does not change. compression, through a gas compression device, i.e. a refrigeration compressor.

The low-pressure and low-temperature refrigerant gas is sucked in by the compressor, compressed, and discharged into high-pressure and high-temperature gas. Condensation, through a heat exchanger, i.e. a condenser (also known as a radiator). The high-pressure, high-temperature refrigerant gas condenses (cools) into a high-pressure liquid by transferring heat to the outside world (actually exothermic) and thus changing the form of the refrigerant, but the pressure does not change.

The entire refrigeration process is carried out by the four units to form a recirculating system, which is connected by pipes, and the refrigerant is repeatedly circulated in this system, so that the temperature is continuously reduced. In order for the refrigeration to proceed properly, a reservoir dryer (usually called a filter drier or bottle dried) is added between the condenser and the expansion valve. Dry and filter water and impurities from the refrigerant and store the refrigerant needed for the refrigeration cycle.

In addition, there are some accessories, such as electronic fans for cooling condensers and blowers for evaporators, which are essential. Some also add a gas-liquid (oil) separator between the evaporator and the compressor on the low-pressure side. In order to make the air conditioning system operate safely and automatically, the system is equipped with pressure controllers (pressure switches) on the high and low pressure sides; A temperature controller (temperature sensor or sensor) is installed on the evaporator on the low pressure side; The entire electrical system is controlled by a computer or controller to achieve automatic operation.

1. The compressor compresses the gas into liquid, (high temperature, high pressure) 2, the high temperature liquid enters the condenser for heat dissipation (normal temperature, high pressure) 3, the liquid enters the evaporator and becomes gas refrigeration (low temperature and low pressure) 4, and the gas is sucked into the compressor.

Summary. Hello, I am your exclusive technician, attentive, careful, dedicated to answering your car questions, for you to find the corresponding problem solutions and solutions! First, automobile air conditioning and refrigeration is to exchange the liquid and gaseous states of the refrigerant.

It is divided into four processes, compression process, condensation process, junction expansion process, and evaporation process.

Second, if the car air conditioner is not refrigerated, first check whether the refrigerant pressure is normal, and if it is normal, check whether the compressor plug voltage is normal.

What is Automotive Refrigeration? What are the four processes of the refrigeration cycle process?

Hello, this question can give you a perfect reply, wait for me to sort out the information, I'm typing, 2-3 minutes, don't finish.

Hello, I am your exclusive technician, attentive, careful, dedicated to answering your car questions, for you to find the corresponding problem solutions and solutions! First, automobile air conditioning and refrigeration is to exchange the liquid and gaseous states of the refrigerant. It is divided into four processes, compression process, condensation process, junction expansion process, and evaporation process.

Second, if the car air conditioner is not refrigerated, first check whether the refrigerant pressure is normal, and if it is normal, check whether the compressor plug voltage is normal.

With the characteristics of the refrigerant, when its pressure drops, it absorbs the heat through the air on the outer surface of the evaporator to achieve the purpose of reducing the air temperature.

The high-pressure liquid flows into the steamer through the throttling (expansion valve) to reduce pressure and cool, and evaporates under the corresponding pressure to absorb the surrounding heat, while the fan inside the car makes the air in the car continuously enter the fins of the evaporator for heat exchange, and sends the cooled gas to the car. In this way, the indoor and outdoor air is constantly circulating to achieve the purpose of reducing the temperature.

The air-conditioning structure of various vehicles is not the same, but their working principle is basically the same, that is, to create a suitable climate environment for the human body in the cabin in an artificial way. In the summer, it is to use refrigeration to cool down the inside of the cabin.

Generally, heat always flows from high to low temperatures, and the purpose of air conditioning is to move the heat from the air inside the car with a lower temperature to the atmosphere with a higher temperature, so that the air inside the car is kept at a lower temperature. This is a reverse circulation of heat flow, which must be completed by the refrigeration mechanism.

Refrigeration process: An engine-driven compressor extracts the gaseous refrigerant from the evaporator and presses it into the condenser. The high-pressure gaseous refrigerant is liquefied in the condenser for heat exchange (heat release), and the heat is carried away by the air outside the vehicle.

The high-pressure liquid refrigerant is reduced by the throttling action of the expansion valve, and the low-pressure liquid refrigerant is vaporized in the evaporator for heat exchange (heat absorption), and the cooled air near the evaporator is blown into the cabin through the blower.

The gaseous refrigerant is pumped out by the compressor and pumped into the condenser, so that the refrigerant carries out a closed circulation flow, and continuously discharges the heat in the compartment to the outside of the carriage, so that the temperature in the compartment drops to a suitable temperature.