Introduction to the physical properties of the new refrigerant and related chemical knowledge—

Today, I will give you a systematic introduction to the physical and chemical characteristics of the new refrigerant, as well as the precautions and points in the installation and maintenance of refrigeration equipment such as air-conditioning cold storage using the new refrigerant:

1. The physical characteristics of the new refrigerant should meet the following conditions

1. The evaporation pressure of the system must be higher than the atmospheric pressure. If the evaporation pressure of the new refrigerant is lower than the atmospheric pressure, it will cause Air entering the refrigeration system may cause system failure. Therefore, if the low-temperature evaporation of the new refrigerant is to be ensured, it is necessary to ensure that the evaporation pressure is higher than the atmospheric pressure;

2. The latent heat of evaporation of the refrigeration system It must be large enough. Under normal circumstances, the greater the latent heat of evaporation of the refrigerant within a certain range, it means that the same amount of refrigerant absorbs more heat;

3. Keep the refrigerant at a higher critical temperature, In general, the higher the critical temperature of the refrigerant, the higher the condensation temperature of the refrigerant, which means that room temperature air or water can be used to cool the refrigerant to make it condense into a liquid state;

4. Maintain the system The condensing pressure of the system is at a low level. The low condensing pressure of the system means that the refrigerant can be easily liquefied at a lower pressure, and the compression ratio of the refrigeration compressor is relatively small, which can effectively reduce the work load of the refrigeration compressor ;

5. The selected refrigerant needs to have the characteristics of low freezing temperature, because the freezing point of the refrigerant is relatively low, it can effectively avoid the freezing of the refrigerant in the evaporator and causing the system to block;

6. The smaller the volume ratio of the gaseous refrigerant, the better, because when the volume ratio of the gaseous refrigerant is low, the volumetric compression cost of the refrigeration compressor will be reduced accordingly, and the refrigeration pipes can also choose smaller models to achieve The purpose of saving cost;

7. When the refrigerant is in a liquid state, the higher the density, the better, mainly because the higher the density of the liquid refrigerant, the smaller the diameter of the refrigeration pipe can be, which is also a cost saving An effective measure;

8. The refrigerant used has high solubility for the refrigerating oil, and the high solubility can avoid the use of oil separators, which saves costs and saves time;

2. The chemical characteristics of the new refrigerant should meet the following points:

1. Stability: The refrigerant must have high chemical stability, and the general refrigerant is evaporated The temperature will change with the change of the ambient temperature. For example, the evaporation temperature of the chiller is about 0-5 degrees Celsius. During the continuous circulation of the refrigerant, only physical changes can occur, and no chemical reactions occur.

2. Non-corrosive: The refrigerant must be an environmentally friendly refrigerant that is not corrosive. For example, ammonia is relatively corrosive to copper materials, so copper tubes cannot be used in ammonia refrigeration systems; In addition, a closed refrigeration compressor cannot be used in the ammonia refrigeration system to avoid corrosion and malfunction;

3. Non-polluting: At present, all countries have strict environmental protection requirements, so the refrigerant used must be It is environmentally friendly and has no damaging effects on nature and the ozone layer. Another point is that we must pay attention to the greenhouse effect;

4. Non-combustible and non-explosive, as serious as toxicity, so we need to pay attention.

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