Cryogenic Freezing Systems

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Cryogenic freezing systems are a commonly used refrigeration equipment. Its main function is to evaporate low-temperature refrigerant into the evaporator through an expansion valve and other devices, thereby absorbing heat and achieving a refrigeration effect.

1. Refrigerant selection

In cryogenic freezing systems, commonly used refrigerants include R404A, R507, etc. These refrigerants have lower saturated steam temperature and higher refrigeration efficiency, and can meet the refrigeration requirements under low temperature conditions.

2. Refrigeration cycle

The refrigeration cycle of cryogenic freezing systems includes four processes: compression, condensation, expansion and evaporation. The refrigeration cycle consists of a compressor, condenser, expansion valve and evaporator. Among them, the compressor compresses the low-temperature refrigerant into high-temperature and high-pressure gas, the condenser cools the high-temperature and high-pressure gas into high-pressure liquid, and the expansion valve expands the high-pressure liquid into low-pressure liquid and passes the refrigerant in the evaporator to finally achieve the refrigeration effect.

3. Evaporation process

Evaporation is the key process of refrigeration in cryogenic refrigeration units. In the evaporator, low-temperature refrigerant enters through an expansion valve and other devices, causing the refrigerant to evaporate at low temperatures and absorb the surrounding heat to achieve the purpose of refrigeration. At the same time, the temperature of the refrigerant will gradually increase during the evaporation process. When it reaches a certain temperature, it will re-enter the compressor and start the next refrigeration cycle.

4. Temperature control

Cryogenic freezing systems require precise temperature control during use to achieve good refrigeration effects. Under normal circumstances, by receiving the signal returned by the temperature sensor, the opening of the expansion valve is automatically controlled to achieve the required temperature control purpose.

In short, the refrigeration principle of cryogenic freezing systems not only requires the selection of refrigerant, but also requires precise control of various parameters of the refrigeration cycle to achieve the best refrigeration effect.

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