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    Does the amount of refrigerant cause frost in the return air pipe and the compressor

    Does the amount of refrigerant cause frost in the return air pipe and the compressor As far as air conditioning is concerned, the principle of system circulation is generally the same as that of refrigerators and freezers. The symptoms of air conditioning systems lacking fluoride are similar to refrigerators and freezers. Many people say that air conditioning lacks fluoride and the thick tube (return pipe) will frost. Under the condition of rated air conditioner, the lack of fluoride in the air conditioning system and the frost phenomenon of the return air pipe are not easy to occur. The temperature of the return air pipe will only be higher than normal after the lack of fluorine, that is, the temperature of the superheat of the return air is higher than normal. It is certain that the fluorine return air pipe can still be frosted. The indoor temperature is low or the ventilation of the internal machine is poor; the ambient temperature is low and the machine is running for a long time, the evaporator begins to frost from the entrance, and gradually grow more and more, It is possible to fill the evaporator up to the air return pipe, but it is not always true that the lack of fluoride in the air return pipe will frost. How does the return air pipe of the refrigeration appliance frost? Under what circumstances will frost? Scientific ethics and logic must be used to explain this problem. 1 Household air conditioner Taking R22 refrigerant as an example, its saturation gauge pressure at 0 degrees is 0.399MPa. When this pressure is lower than the corresponding temperature of 0 degrees, that is, the crystallization point (freezing point) of water, the outer surface of the tube will of course first Frosted after condensation, this is normal physical response and changes. Therefore, after the low pressure of the home air conditioner is lower than 0.399MPa, the connecting pipe will start to frost. 2 Household refrigerator The refrigerant used in the freezer is R12, R134a, R600a, etc. When the saturation pressure of R12 refrigerant is less than 2.11kg, the saturation pressure of R134a refrigerant is less than 0.193MPa, and the saturation pressure of R600a refrigerant is less than 0.058MPa gauge pressure, The saturation temperature is at or below 0 degrees. When the temperature is below 0 degrees, if more refrigerant is added to the system at this time, the refrigerant in the evaporator cannot be sufficiently heat exchanged (endothermic) to produce boiling (evaporation), If the superheat of the return air is too small, the liquid refrigerant will enter the return air pipe and even the compressor, which will inevitably cause frosting on the return air pipe and even the compressor. 3 Cold storage The difference of the cold storage is that, according to the thermodynamic properties (physical and chemical properties) of the refrigerant used, as well as the evaporating temperature and return air superheat specified by the system, when the superheat is too small, such as the expansion valve opening is too large, or the system When there is too much refrigerant and the liquid level in the evaporator is too high (too much), excessive moisture and moisture will be entrained in the return air, and the compressor may cause liquid shock and frost. These are different systems. Under different refrigerants and different corresponding pressures and temperatures, different reactions occur, which are also specific thermal conditions of the refrigeration system. This is a basic problem that is easy to understand. Do n’t misunderstand and confuse!

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