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Refrigeration system finds liquid backflow
1. For small refrigeration systems using capillary tubes, excessive liquid addition will cause liquid backflow. When the evaporator is heavily frosted or the fan fails, the heat transfer becomes poor, and the unevaporated liquid will cause liquid backflow. Frequent temperature fluctuations will also cause the expansion valve to fail to respond and cause liquid backflow.
2. For refrigeration systems using expansion valves, liquid return is closely related to the selection and improper use of expansion valves. Excessive selection of the expansion valve, too small superheat setting, incorrect installation of the temperature sensing package or damage to the thermal insulation wrapping, or failure of the expansion valve may cause liquid backflow.
For refrigeration systems where liquid backflow is difficult to avoid, the installation of gas-liquid separator control can effectively prevent or reduce the harm of liquid backflow.
High suction temperature of refrigeration system
1. Other reasons cause the suction temperature to be too high, such as poor insulation of the return gas pipeline or too long pipeline, which can cause the suction temperature to be too high. Under normal circumstances, the compressor cylinder head should be half cool and half hot.
2. The refrigerant charge in the system is insufficient, or the opening of the expansion valve is too small, resulting in insufficient refrigerant circulation in the system, less refrigerant entering the evaporator, and high superheat, resulting in high suction temperature.
3. The filter screen of the expansion valve port is blocked, the liquid supply in the evaporator is insufficient, the amount of refrigerant liquid is reduced, and a part of the evaporator is occupied by superheated steam, so the suction temperature rises.