How to distinguish the quality of refrigerant

The refrigerant is an important factor that affects the temperature of the cold storage, and it is especially important to choose a good refrigerant. So how to distinguish the quality of refrigerant in cold storage construction? Today, the Refrigeration Editor will give you an introduction.

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: filled with high-purity refrigerant The cold storage has obvious refrigeration effect, rapid temperature drop, and large refrigeration capacity; low-purity refrigerants not only fail to reach the desired drop temperature, but also damage the compressor. Whether to purchase refrigerants produced by regular manufacturers through formal channels, such as refrigerants whose prices are significantly lower than market prices, should arouse a high degree of vigilance.

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 (in HCL) should be less than 0.0001.

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: [1] 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 indicates that the quality of the refrigerant is not good and it is not recommended; [2] Connect the pressure gauge to test the pressure of the refrigerant bottle, and compare it Refrigerant temperature and pressure characteristic table, to check whether the pressure in the bottle is within the normal range. 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 u200bu200bshould 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 it. Pollution system.

In the system debugging and operation stage, if the following abnormal phenomena are found: [1] The system refrigeration capacity is obviously insufficient and no other abnormalities are found after inspection, you need to pay attention to the refrigerant; [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 shutdown status When the system balance pressure is abnormal (can be compared with the refrigerant temperature and pressure characteristic table), the refrigerant needs to be paid attention to. 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 from the entire system to avoid potential inferior refrigerant from contacting the compressor and damaging the compressor.

Once it is found that the unit components or the compressor are malfunctioning due to chemical pollution caused by inferior refrigerant, then the unit that used the same source of refrigerant in the site (even if the unit is still normal Work) also need to replace the refrigerant. Because the influence of harmful chemical components in low-quality refrigerants is sometimes slow, it may cause system failure after a long period of use.

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