Refrigerant is the "refrigeration carrier" of the cold storage refrigeration system, and its charge must strictly conform to the system design standards. Too much or too little will disrupt the system pressure balance. Insufficient refrigerant is mostly caused by pipeline leakage, while excessive charge results from improper operation. Although both seem to be charge issues, they will directly lead to excessively high system high pressure and excessively low low pressure, induce equipment faults, and affect refrigeration efficiency.

           The two abnormal conditions correspond to different pressure hazards, both of which will break the system stability. When refrigerant is insufficient, the amount of circulating refrigerant in the system is insufficient, the pressure on the low-pressure side drops sharply, the heat exchange efficiency of the evaporator decreases significantly, and pipeline frosting is likely to occur; when overcharged, the excess refrigerant cannot circulate normally, the pressure on the high-pressure side soars, increasing the operating load of the compressor and easily causing component overheating.

          Excessively high high pressure and excessively low low pressure will induce multiple chain faults. Excessively high high pressure will accelerate the wear of compressors and condensers, increase energy consumption, and trigger shutdown protection in severe cases; excessively low low pressure will lead to insufficient cooling capacity, making it impossible to maintain the set temperature of the cold storage, and may damage throttling components. Insufficiency caused by leakage will also lead to continuous refrigerant loss and expand the fault scope.

          Standard operation and maintenance require strict control of refrigerant charge and leakage inspection: regularly detect refrigerant pressure, accurately charge the appropriate type of refrigerant, and eliminate overcharging; inspect pipeline interfaces, valves and other parts, timely find and repair leakage points, and supplement refrigerant to the standard range; regularly detect refrigerant purity to avoid impurities affecting system operation.

          Precise control of refrigerant charge is the key to stable system operation. Doing a good job in leakage inspection and standardized charging can maintain system pressure balance, ensure refrigeration efficiency, extend equipment service life, and avoid operational losses caused by abnormal pressure.