Refrigeration principles of refrigerators and air conditioners

Refrigeration principles of refrigerators and air conditioners Is the cooling principle of refrigerator and air conditioner the same?

　　 Refrigerator is a kind of refrigeration equipment that keeps a constant low temperature, and it is also a civilian product that keeps food or other items in a constant low temperature and cold state. There are cabinets or boxes for freezing by compressors and ice machines, and storage boxes with refrigeration devices.

　　 1. The principle of refrigerator refrigeration

　　 (1) The compressor compresses refrigerant gas. This will increase the pressure and temperature of the refrigerant, and the heat exchange coil outside the refrigerator helps the refrigerant dissipate the heat generated by pressurization.

　　 (2) When the refrigerant is cooled, the refrigerant liquefies into a liquid form and flows through the safety valve.

　　 (3) When the refrigerant flows through the safety valve, the liquid refrigerant flows from the high pressure area to the low pressure area, so it expands and evaporates.

　　(4) During the evaporation process, it will absorb heat and exert a cooling effect.

　　(5) The coil in the refrigerator helps the refrigerant absorb heat and keep the inside of the refrigerator low. Then, repeat the cycle.

　　 2. Refrigeration principle of air conditioner

　　(1) After the air conditioner is energized, the low-pressure vapor of the refrigerant in the refrigeration system is sucked by the compressor and compressed into high-pressure vapor before being discharged to the condenser. At the same time, the outdoor air sucked by the axial flow fan flows through the condenser, taking away the heat released by the refrigerant, and condensing the high-pressure refrigerant vapor into a high-pressure liquid.

　　(2) The high-pressure liquid is sprayed into the evaporator after passing through the filter and the throttling mechanism, and evaporates under the corresponding low pressure to absorb the surrounding heat. At the same time, the cross-flow fan keeps air entering the fins of the evaporator for heat exchange, and sends the cooled air to the room after the heat is released. In this way, the indoor air continuously circulates to achieve the purpose of lowering the temperature.

　　 Therefore, it can be seen from the above that the refrigeration principle of the refrigerator is the same as that of the air conditioner, and both start with the compression of the refrigerant.

　　What is the refrigerant used in the refrigerator?

　　The refrigerant Freon 12 (R12) for refrigerators and the refrigerant Freon 22 (R22) for air conditioners used daily are all chlorinated halogenated hydrocarbons, which have a destructive effect on the ozone layer. At present, there are R401A and R407C as the most popular substitutes for freon 22 mixed working fluid in the world. For household air conditioners, European countries tend to choose R407C.

　　 Refrigerators generally use R12 as the refrigerant. R12 has good characteristics such as odorless, non-irritating odor, non-toxic, non-combustible, etc., so it is widely used. However, its compressor is large in size, the pipe is thicker, and the permeability is strong. It has a destructive effect on the atmospheric ozone layer. In order to overcome Its shortcomings, current refrigerators use a new type of refrigerant R134a.

R-134a is currently internationally recognized as the best environmentally friendly alternative to R-12. It does not destroy the ozone layer at all. It is an environmentally friendly refrigerant recognized and recommended by most countries in the world. It is also the current mainstream environmentally friendly refrigerant and is widely used The initial installation of new refrigeration and air-conditioning equipment and the addition during the maintenance process.

　　 The green refrigerator we talk about daily is a refrigerator that no longer uses chemical gases that destroy the ozone layer, such as fluorine, as refrigerant.