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In the drying and freeze-drying equipment, the low-temperature cooling system is one of the core components, which is crucial for achieving the freeze-drying process.

Freeze drying (freeze-drying) is an effective method for removing moisture from materials without damaging their physical and chemical structures, and is widely used in fields such as food processing, biological products, and pharmaceutical manufacturing.

Low temperature cooling systems typically include the following functions:

1. Refrigeration unit: Provides an extremely low temperature environment, allowing the material to be dried to be pre frozen into a solid state, i.e. freezing the moisture in the material.
2. condenser: During the freeze-drying process, when ice crystals in the material directly transform from solid to gaseous (sublimation) under vacuum conditions, the low-temperature cooling system ensures sufficient low-temperature conditions to capture and condense the sublimated water vapor, preventing it from returning to the surface of the material.
3. Cooling medium circulation: Utilize refrigerant or coolant to circulate in a closed system, absorb heat through a heat exchanger, and maintain the low temperature of the freeze-drying chamber and condenser.
4. Temperature control: The low-temperature cooling system requires precise temperature control to ensure that the entire freeze-drying process is carried out according to the predetermined procedure, such as pre freezing first, and then gradually heating up for the main drying and desorption drying stages.

For example, in a vacuum freeze dryer, the low-temperature cooling system may include a refrigeration cycle system composed of a compressor, evaporator, condenser, expansion valve, etc., as well as related control systems, working together to achieve efficient and stable low-temperature freezing effects. With the development of technology, modern low-temperature cooling systems are often more integrated and intelligent, providing better energy efficiency and user experience.