How to detect inferior refrigerants? What's the harm?

1. Detection of the authenticity of refrigerants Inferior refrigerants will affect the performance and stability of the system, and more seriously will cause damage to the system components and compressors. The following methods can be used to distinguish whether it is a low-quality refrigerant: 1. Connect to a pressure gauge test. If the measured pressure is lower than the corresponding saturation pressure at the ambient temperature by more than 2kg/f, it can be judged that the refrigerant is not Qualified products are strictly prohibited to use! For example: the ambient temperature is 20 degrees, the measured pressure value is 7.1kg/f, which is far lower than the saturation pressure value of 13.5kg/f that the refrigerant at this temperature should reach, then the refrigerant can be judged to be unqualified. The corresponding value of R410A saturation temperature and saturation pressure 2. Foam detection method. Foam detection method is effective for refrigerants containing corrosive gases such as methyl chloride, and the corrosion degree of the foam is related to the content of methyl chloride. The higher the content, the effect The more obvious and the lower the content, the less obvious the effect. The specific operation is as follows: 3. Turn the refrigerant tank upside down and release a small amount of refrigerant onto a piece of white paper. If there are obvious impurities or liquid water on the white paper , Indicating that the quality of the refrigerant is not good, so it is not recommended to use it. In addition, refrigerants that can be purchased through regular channels, such as refrigerants whose prices are significantly lower than the market prices, should arouse a high degree of vigilance. 4. If you have the test conditions, it is recommended to check the purity and acidity of the refrigerant before using it. It is not recommended to use the refrigerant whose test results are significantly lower than the industry standard. Note: The purity of qualified R22 refrigerant should be greater than 99% (the purity of high-quality refrigerant is greater than 99.8%), and the acidity should be less than 0.0001. 5. During the system debugging and operation stage, no other abnormalities were found after inspection, and the refrigeration capacity was insufficient; the dryer or expansion valve was blocked, and the blockage was yellow-brown wax-like or black sludge-like foreign matter, etc., it is recommended to extract refrigeration from the system The purity of the refrigerant is tested to eliminate the risk of inferior refrigerants. 2. The impact of refrigerant purity on the system. The refrigerant is the blood of the compressor. The purity of the refrigerant is particularly important for the cold storage refrigeration equipment. The most obvious phenomenon is: the cold storage filled with high-purity refrigerant, the cooling effect Obviously, the temperature drop has a fast aging effect and a large refrigeration capacity; the low purity refrigerant will not only fail to reach the required drop temperature, but will also damage the compressor. So what are the negative effects of low refrigerant purity? 1. High water content and high acidity severely corrodes the internal pipeline system of the compressor, causing blockage in the compressor and shortening the service life of the compressor. 2. It is easy to leak, there is no fluorine in the refrigeration system, the compressor has been idling, the operating temperature is high, and the parts are worn out, which will also shorten the service life of the compressor. 3. Increase the operating load of the compressor, increase the power consumption, and increase the expenditure. 4. Poor cooling effect and frequent problems. Although the inferior quality refrigerant will temporarily feel cool, the temperature is always difficult to drop and the expected cooling effect cannot be achieved.

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