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    What's going on with frost during refrigeration compressor operation

    What's going on with frost during refrigeration compressor operation Whether the compressor will frost depends on the evaporation temperature of the system and the superheat of the return air. The dry storage evaporator system of cold storage and refrigerator freezer, the refrigeration system under standard working conditions such as semi-full liquid and full liquid evaporator system using refrigerant, the evaporation temperature is below 0 ℃, the superheat of return air is generally at 15°C or below. If the compressor of this system is frosted, it means that the suction gas of the compressor is too moist and too wet, and the evaporation effect is not good. In layman's terms, the refrigerant is not completely evaporated in the evaporator, the heat transfer is not complete, and the evaporation is "excess". Therefore, excessively moist gas that has not completely evaporated will enter the return pipe and the compressor. A liquid shock is generated, which damages the compressor's air valve and prevents the compressor from working properly. Due to the frosting of the return air pipe, the superheat of the return air is greatly reduced, and the suction temperature and oil temperature of the compressor are reduced, which increases the viscosity of the compressor lubricating oil and the fluidity, which aggravates the wear or damage of the rotating parts of the compressor The mechanical parts affect the service life of the compressor. The root cause of this phenomenon is: the opening of the throttle valve is too large, the flow rate is large, and too much liquid enters the evaporator; or there is too much refrigerant in the system, the filling volume is too large, and the liquid in the evaporator The face is too high. In refrigeration systems under air-conditioning conditions, the evaporating temperature is generally above 0°C, and the superheat of return air is lower than that in standard conditions. The frost of the air conditioning system is the result of the liquid refrigerant boiling and evaporating and absorbing heat. The liquid refrigerant exchanges heat with the heat in the air brought by the fan in the evaporator of the internal engine, causing boiling and evaporating into low-temperature steam. The fan continuously sends air circulation, the low-pressure liquid in the evaporator continuously exchanges heat, continuously evaporates, and finally all evaporates into low-temperature steam. It is this low-temperature steam that is transported in the thick tube, and the cold is transferred through the wall of the tube, contacting with the external hot air to absorb heat, solidifying the moisture in the air into frost, condensing on the surface of the tube, this is the physical change of the refrigerant Phenomenal process. If the air-conditioning system using R22 refrigerant, when the low-pressure pressure is lower than 3.99 kg gauge pressure, the corresponding temperature is 0 degrees or below. It is only under this pressure that the connecting pipe is likely to frost. When the pressure is 3 kg gauge pressure, the corresponding temperature is -7 degrees. Why is there no frost when the temperature of -7 degrees passes through the connecting pipe? As long as the temperature is below 0 degrees, there will be frosting. When the pressure is too low, that is, the system lacks too much refrigerant, the thick pipe may not frost, because the evaporation amount is small at this time, and the superheat of the low-temperature steam after evaporation is greater. The thick pipe is most likely to frost only between 3 and 4 kg gauge pressure. Of course, the connection pipe must have good heat insulation; it cannot be an extension pipe; nor can the air conditioner's external unit be completely exposed to heat; and the thick pipe can be frosted when the temperature is very hot. When the temperature is lower, the frost phenomenon is easier to manifest. The degree of frost lacking in the refrigerant thick pipe depends on the length of the connecting pipe, the effect of heat preservation, the temperature of the outside temperature, and the degree of refrigerant shortage in the system! It may be tied to the thick pipe valve of the external unit of the air conditioner, or it may only be tied to the 2/3, or 1/3 of the thick pipe, and so on. In addition, if the evaporator of the internal unit is dirty, the air volume is insufficient, the air filter is blocked, and the connecting pipe is excessively twisted, etc., it may also cause frost on the thick connecting pipe. When there is too much refrigerant in the system, it will only cause the pressure of the system to be too high, the pressure will increase, and the corresponding temperature will also increase, so the pressure and temperature will not be frosted. If the low pressure exceeds 5 kg gauge pressure, the air temperature of the air conditioner will rise instead. In fact, as long as you try it, it is clear that the air conditioner is artificially reduced to 3~4 kg gauge pressure in the cooling state (mode). After starting for a period of time, the thin tube will frost first, and the thick tube will frost. The phenomenon.

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