Refrigerants are widely used in the chiller equipment industry, and refrigerants are also called refrigeration refrigerants in professional terms, and in the south many refrigerants are called refrigerants. It is a working substance that continuously circulates in a refrigeration system and achieves refrigeration through its own state change. The refrigerant absorbs the heat of the cooling medium (water, air, etc.) in the evaporator and vaporizes it, and transfers the heat to the surrounding air or water in the condenser to condense.
The nature of the refrigerant is directly related to the refrigeration effect, economy, safety, and operation management of the refrigeration device. Therefore, understanding of the nature of the refrigerant cannot be ignored, and this is also a vital link.
According to the saturation pressure Pk and the normal evaporation temperature T0 when the refrigerant condenses in the condenser at room temperature, it is generally divided into three categories:
1. Low pressure and high temperature refrigerant, the condensation pressure Pk≤2 ~ 3 ㎏ / 2 (absolute), T0> 0 ℃, such as R11 (CFCl3), T0 = 23.7 ℃. This type of refrigerant is suitable for use in centrifugal refrigeration compressors for air conditioning systems. Usually at 30 ° C, Pk≤3.06 ㎏ / ㎝.
2. Medium pressure and medium temperature refrigerant: Condensing pressure Pk <20 ㎏ / ㎝ (absolute), 0 ℃> T0> -60 ℃. Such as R717, R12, R22, etc., this type of refrigerant is generally used in ordinary single-stage compression and double-stage compression piston refrigeration compressors.
3. High pressure and low temperature refrigerant: Condensing pressure Pk ≥ 20 ㎏ / ㎝ (absolute), T0 ≤ -70 ° C. Such as R13 (CF3Cl), R14 (CF4), carbon dioxide, ethane, ethylene, etc., this type of refrigerant is suitable for low-temperature parts of cascade refrigeration devices or low-temperature devices below -70 ° C.
The three categories mentioned above may be difficult for friends with relatively weak basic knowledge, and for more related introductory knowledge, you can visit http://ylscps.com to browse
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