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, to the technical analysis of the whole.
Considering environmental protection requirements.
Should be chosen in accordance with the state environmental protection laws and regulations of the refrigerant.
Considering the refrigeration temperature requirements.
Depending on the coolant temperature and cooling conditions, choose high temperature (
, medium temperature (
And low temperature (
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 (
Choose R12 refrigerants, in the past, everything is chosen mostly knock.
Considering the nature of the refrigerant.
According to the refrigerant thermodynamic properties, physical properties and chemical properties, choose those no poison, no explosion, burning refrigerant;
Should choose refrigerant heat transfer is good, small resistance, good compatibility with refrigeration system with material.
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
New working medium appear constantly, in order to suitable for different refrigeration unit.
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