A comprehensive explanation of refrigerants, it turns out to be so practical

Many people must not have a deep understanding of refrigerants, but when it comes to Freon, many people may know that if the air conditioner is not cooling, they will look for a repairer. The general teacher will say that the air conditioner lacks fluorine. In fact, , The fluorine added in the air conditioner is a kind of refrigerant, the following editor will take you to learn more about it!

Question 1: What is a refrigerant?

Refrigerants are also called refrigeration working fluids, and are commonly known as refrigerants in some areas in the south. It is a working substance that continuously circulates in the refrigeration system and realizes refrigeration through its own state changes. The refrigerant absorbs the heat of the cooling medium (water or air, etc.) in the evaporator to vaporize, and transfers the heat to the surrounding air or water in the condenser to condense. When it comes to air-conditioning products, we usually say that freon is added, so what is freon? Freon is a general term for halogen derivatives of saturated hydrocarbons (hydrocarbons). It is a type of refrigerant that emerged with the development of the chemical industry in the 1930s. Its emergence solves the problem of refrigerants in the refrigeration and air-conditioning industry. Seek. From the definition of Freon, it can be seen that the non-Freon R134A, R410A and R407c are actually all Freon.

Question 2: What is the refrigerant for?

To clarify this problem, you have to clarify the entire working principle of the air conditioner. Let's take a look at how ordinary air conditioners work. The air conditioner first uses electric energy to compress gas into liquid, and then evaporates the liquid at the refrigeration end (endothermic process), and the evaporated gas is guided back to the compressor and then becomes liquid again (exothermic process). The heat comes to a continuous great shift in order to achieve the purpose of refrigeration. What is called 'refrigerant' (freon) in the air conditioner that changes from liquid to gas, or from gas to liquid for heat transfer.

Question 3: What are the types of refrigerants and what are the differences between them?

The fluorine refrigerants we use in the refrigeration industry include R11, R12, R22, R32, R113, R114, R115, R123, R125, R134A, R143A, R141b, R142b, R152, R404A (44% R125 and 52% R143A and 4% 134A), R407c (23% R32 and 25% R125 and 52% R134A), R410A (50% R32 and 50% R125), R500 (73.8% R12 and 26.2% of R152), R502 (48.8% of R22 and 51.2% of R115), etc. Freon can destroy the ozone layer because of the presence of cl element in the refrigerant, and as the number of cl atoms increases, the ozone layer destructive ability increases, as the content of h element increases, the ozone layer destructive ability decreases; the greenhouse effect is mainly due to In the process of slow oxidation and decomposition of refrigerant, a large amount of greenhouse gases, such as co2, are generated.

According to the molecular structure of Freon refrigerants, it can be roughly divided into the following three categories:

1. Chlorofluorocarbons:

Abbreviated as CFC, mainly including R11, R12, R113, R114, R115, R500, R502, etc., are listed as a class of controlled substances by the Montreal Protocol due to their most destructive effects on the ozone layer. The use of such substances is currently banned. In the process of making polyurethane sponges, R11 has been replaced by R141b as a transitional substitute.

2. Hydrochlorofluorocarbons

abbreviated as hcfc, mainly including R22, R123, R141b, R142b, etc. The ozone layer destruction coefficient is only a few percent of R11. Therefore, currently hcfc Substances are regarded as the most important transitional substitutes for CFC substances. In the Montreal Protocol, R22 is limited to 2020 and R123 is limited to 2030. Developing countries can postpone it for 10 years.

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