How to distinguish inferior refrigerants What effect does refrigerant purity have on the system

How to distinguish inferior refrigerants What effect does refrigerant purity have on the system Inferior refrigerants will affect the performance and stability of the system, and more seriously will cause damage to system components and compressors. The following methods can be used to distinguish whether it is a low-quality refrigerant:

　　 1. Whether to purchase refrigerants produced by regular manufacturers through formal channels, such as refrigerants whose prices are significantly lower than the market prices, should cause a high degree of vigilance.

　　2. 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 (calculated by HCL) should be less than 0.0001.

　　3. If you do not have the conditions for refrigerant detection, it is recommended to perform a simple inspection before using the refrigerant. The simple inspection method can be:

　　 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, it means that the refrigerant is of poor quality and is not recommended;

connect the pressure gauge to test the pressure of the refrigerant bottle, and check whether the pressure in the bottle is within the normal range by comparing it with the refrigerant temperature and pressure characteristic table. If the pressure is obviously abnormal, it is not recommended. And when the refrigerant is half used, the pressure in the bottle can be tested again. For a single-component refrigerant such as R22, the two measured bottle pressure values

should be very close, but for inferior refrigerants, multiple components are usually mixed. After the internal refrigerant is used, the bottle pressure usually varies greatly due to the change of the composition ratio. If such a phenomenon is encountered, it is recommended to stop the refrigerant immediately and discharge the refrigerant that has been charged into the system to avoid Pollution system.

　　4. During the system debugging and operation stage, if the following abnormal phenomena are found:

　　[1]. The refrigeration capacity of the system is obviously insufficient and no other abnormalities are found after inspection, the refrigerant should be paid attention to;

　　[2]. When the system dryer filter or expansion valve is clogged, and the clogging is yellow-brown wax-like or black sludge-like foreign matter, pay attention to the refrigerant;

　　[3]. High and low pressure or temperature abnormalities occur during system operation, or the system balance pressure is abnormal when the system is stopped (refer to the refrigerant temperature and pressure characteristics table), and attention should be paid to the refrigerant. When these abnormal phenomena occur, it is recommended to extract refrigerant from the system for purity testing to troubleshoot the risk of inferior refrigerant. During this period, it is recommended to empty the refrigerant on the compressor side or release the refrigerant in the entire system to avoid potential inferior refrigerant contact with the compressor and damage the compressor.

　　Once it is discovered that the unit components or compressors are faulty due to chemical pollution caused by inferior refrigerant, the units that have used the same source of refrigerant in the site (even if the unit is still working) need to replace the refrigerant. Because the impact of hazardous chemical components in poor-quality refrigerants is sometimes slow, it may cause system failure after a long period of use.

　　The effect 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 is obvious, the temperature drops quickly, and the cooling capacity Large; low-purity refrigerants not only fail to reach the desired temperature drop, but 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. Some low-quality refrigerants are even mixed with a lot of flammable and explosive gases, which seriously affect the safety of people's lives and property.

　　5. 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.

　　6. ​​Freon in the refrigerant, once leaked, it will destroy the ozone layer and cause great harm to the atmosphere on which humans depend.

　　 Refrigerants have made a great contribution to changing the living environment of human beings, but people’s understanding of refrigerants is still at a preliminary stage, and they think that only refrigerants for refrigeration are enough. In fact, the original refrigerants from large manufacturers are strictly controlled by the sample inspection, the purity inspection equipment is sophisticated, and the quality is guaranteed. However, some small distributors, driven by huge profits, subpackage the refrigerant produced by the original factory and sell it. The refrigerant equipment for the subpackage is simple and cannot control the contact space between the refrigerant and the air, which easily leads to the air content in the refrigerant. Exceeding the standard, there is too much water, and the phenomenon of ice blocking occurs after filling the refrigeration equipment. If there is a problem with the refrigeration equipment and the compressor is damaged, it is really not worth the loss.