The selection of refrigerant skills

refrigerant is also called the refrigerating agent, commonly known as snow in some areas of the south. It is a cycle in the refrigeration system and through its own change of state in order to realize the refrigeration work material. Refrigerant in the evaporator absorbed by the cooling medium ( With air or water, etc. ) Heat and evaporation, in the heart of the condenser heat transfer to the surrounding air or water and condensation.

the selection of refrigerant is a complex technical and economic problems, there are many factors to consider, when the choice should be based on specific circumstances, a thorough technical analysis.

1。 Considering environmental protection requirements. Must be chosen in accordance with the state environmental protection laws and regulations of the refrigerant.

2。 Considering the refrigeration temperature requirements. Depending on the coolant temperature and cooling conditions, choose high temperature ( Low pressure) , medium temperature ( Medium voltage) And low temperature ( High pressure) Refrigerants. Usually choose standard of refrigerant evaporation temperature is lower than the refrigeration temperature 10 ℃. Select refrigerant refrigeration unit should also be considered the cooling conditions, using the environment etc. Running the condensing pressure shall not exceed the compressor conditions of safe use of the specified value. Automotive air conditioning can only make a cooling medium, car outside air to its impact factors such as temperature, wind speed, solar radiation, thermal radiation is in frequent changes, the operating condition is determined by it can only choose high temperature ( Low pressure) Choose R12 refrigerants, in the past, everything is chosen mostly knock.

3。 Considering the nature of the refrigerant. According to the refrigerant thermodynamic properties, physical properties and chemical properties, choose those non-toxic, no explosions, no burning of refrigerant; Should choose refrigerant heat transfer is good, small resistance, good compatibility with refrigeration system with material.

4。 Consider the type of compressor. Different refrigeration compressor working principle is different. Volume compressor through the narrow, the volume of refrigerant vapor to increase its pressure refrigerant refrigerating capacity per unit volume is big, is generally selected as everything, R22, etc. There are many kinds of refrigerants, with the progress of science and technology. New working medium appear constantly, in order to suitable for different refrigeration unit.

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