Refrigerants are also called refrigeration working flui […]
Refrigerants are also called refrigeration working fluids, 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. R410 refrigerant tube 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.
The selection of refrigerant is a relatively complex technical and economic issue, and there are many factors that need to be considered. When selecting, an overall technical analysis should be carried out according to the specific situation.
1. Consider the requirements of environmental protection. Choose refrigerants that comply with national environmental protection regulations.
2. Consider the requirements of refrigeration temperature. According to different refrigerant temperature and cooling conditions, high temperature (low pressure), medium temperature (medium pressure), and low temperature (high pressure) refrigerants are selected. Usually the standard evaporating temperature of the selected refrigerant is 10°C lower than the refrigerating temperature. The choice of refrigerant should also consider the cooling conditions and use environment of the refrigeration device. The condensing pressure during operation should not exceed the specified value of the compressor's safe use conditions. Automobile air conditioners can only use the air outside the car as the cooling medium. The temperature, wind speed, solar radiation, heat radiation and other factors that affect it frequently change. Its operating conditions determine that it can only use high temperature (low pressure) refrigerants. In the past Choose R12, but mostly choose R134a when posting.
3. Consider the nature of the refrigerant. According to the thermal properties, physical properties and chemical properties of the refrigerant, select those non-toxic, non-explosive, non-combustible refrigerants; the selected refrigerant should have good heat transfer, low resistance, and good compatibility with the materials used in the refrigeration system.
4. Consider the type of compressor. Different refrigeration compressors work differently. The volumetric compressor increases its pressure by reducing the volume of the refrigerant vapor. Generally, refrigerants with large refrigeration capacity per unit volume, such as R134a, R22, etc., are used. There are many types of refrigerants, with the advancement of science and technology. New working fluids are constantly appearing to suit different refrigeration devices.