In the development of modern industry, large temperature difference freezer is also important in cold treatment. In the whole process of large temperature difference freezer refrigeration, refrigerant charging is also more important. So how do you charge?
For large-temperature-difference freezer refrigeration systems without high-pressure reservoirs and low-pressure vapor-liquid separators, the control of refrigerant charge is particularly important. Because the refrigeration system is a condenser and also acts as a high-pressure reservoir, the refrigerant is stored in the condenser, and the condenser is cooled. The heat dissipation area is reduced and the condensing pressure is increased, resulting in a decrease in cooling capacity.
For the control of the refrigerant charge of such a large temperature difference freezer, during the charging process, the temperature of the condenser casing should be touched, the upper outlet of the condenser outlet is heated, and the outlet below the outlet is cool (heating) It is indicated that there is a high-temperature exhaust gas of the compressor condensing inside, and the cooling is cold, indicating that the water-cooled large temperature difference refrigerator is a liquid space). Secondly, look at the suction pressure, which corresponds to the temperature of the refrigerant water in the evaporator (that is, corresponds to the evaporation temperature). Then, depending on the return temperature of the compressor of the large temperature difference refrigerator, the return pipe of the high temperature unit should be cooled and dew, but it can be dew condensation to the compressor return valve. The return pipe of the low temperature unit should be frosted, but the frost is compressed. The machine return valve is fine. If condensation or frost builds up on the compressor casing, liquid refrigerant will enter the crankcase, causing the compressor to run oil and liquid. For hermetic compressors, the motor terminals are also shorted. Although most of the closed unit terminals are sealed with a sealant, the possibility of a short circuit still exists due to the uncertainty of the sealing effect.
The above is the refrigerant charging method of Wuxi Guanya LNEYA finishing, hope to help everyone to run a large temperature difference freezer.