In refrigeration system, suction superheating, subcooling, evaporation pressure and condensing pressure are four important thermodynamic parameters, which are closely related and influence each other. Understanding the relationship between these parameters is important to optimize the performance of refrigeration systems, improve efficiency, and prevent system damage.

Suction superheating Suction superheating refers to the phenomenon that the temperature of the refrigerant vapor inhaled by the compressor is higher than its saturation temperature at the same pressure. Inspiratory superheating can be divided into two types: one is the superheating that occurs inside the evaporator, which is beneficial because it can ensure that the compressor is completely inhaled by steam and avoid the liquid shock caused by the liquid refrigerant entering the compressor. The other is the overheating that occurs after the evaporator outlet and before the compressor is inhaled, which is considered unfavorable because it will increase the power consumption of the compressor and reduce the refrigeration efficiency.

The degree of supercooling refers to the difference between the refrigerant liquid temperature at the condenser outlet and its saturation temperature at the same pressure. The presence of supercooling helps to improve the efficiency of the refrigeration system, because the supercooled refrigerant has partially lowered its temperature before entering the throttling device, reducing the flash gas during the throttling process. The unit cooling capacity is improved. Undercooling also helps to avoid wet travel of the compressor, improving system reliability.

Condensing pressure refers to the pressure when the refrigerant condenses in the condenser, which is the pressure on the high pressure side of the refrigeration system. The condensing pressure corresponds to the condensing temperature. The higher the condensing pressure, the higher the condensing temperature. The increase of condensing temperature will lead to the increase of compressor pressure ratio, the increase of compressor power consumption, and the decrease of refrigeration efficiency. Therefore, it is very important to control the proper condensation temperature to improve the performance of the refrigeration system.

Evaporation pressure refers to the pressure when the refrigerant evaporates in the evaporator, which is the pressure on the low pressure side of the refrigeration system. The evaporation pressure corresponds to the evaporation temperature, and the lower the evaporation pressure, the lower the evaporation temperature. The decrease of evaporation temperature means that the evaporation potential heat of the refrigerant increases, and the refrigeration effect is enhanced, but at the same time, it will also lead to the increase of the pressure ratio of the compressor, the increase of the power consumption of the compressor, and the decrease of the refrigeration efficiency. Therefore, in actual operation, it is necessary to adjust the pressure according to the specific working conditions to achieve the best cooling effect and energy efficiency ratio.

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