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The selection of refrigerant is a more complex technical and economic problem, and there are many factors to be considered. A comprehensive technical analysis should be carried out according to the specific situation.
1. Consider environmental requirements.
2. Consider cooling temperature requirements.
According to the different refrigerant temperature and cooling conditions, choose high temperature (low pressure), medium temperature (medium pressure), low temperature (high pressure) refrigerant. The standard evaporation temperature of the refrigerant is usually selected to be 10 ° C lower than the cooling temperature. The selection of refrigerant should also consider the cooling conditions of the refrigeration device, the use of the environment, etc. The condensing pressure in operation should not exceed the specified value of the compressor safe service condition.
3. Consider the nature of the refrigerant.
Choose refrigerants that are non-toxic, non-explosive and non-combustible; Refrigerants should have good heat transfer, low resistance and good compatibility with materials used in refrigeration systems.
4. Consider the type of compressor.
Different refrigeration compressors work differently. Volume compressors improve their pressure by reducing the volume of refrigerant vapor. Generally, refrigerants with large unit volume refrigerating capacity are selected, such as R134a,R22 and so on. There are many kinds of refrigerants, with the progress of science and technology. New working materials are constantly appearing to be suitable for different refrigeration units.