Learn about the classification of low-temperature refrigeration units

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Learn about the classification of low-temperature refrigeration units: 1. Single-unit, single-stage screw chillers: The outlet water temperature can generally reach as low as -45°C, and the refrigerant is usually an ethylene glycol solution, saltwater solution, or ternary solution. 2. Single-unit two-stage screw-type low-temperature chiller: It can provide a low-temperature cooling source ranging from -30°C to -55°C; typical refrigerants include ethylene glycol solutions, brine solutions, ternary solutions, silicone oil, dichloromethane, etc ； 3. Binary cascade cryogenic refrigerator: It utilizes a binary cascade refrigeration system, consisting of a high-temperature stage (R404A/R22) and a low-temperature stage using R23; it generally provides ultra-low temperature cooling for processes ranging from -30°C to -85°C ； 4. Three-stage cascade cryogenic refrigerator: It consists of a high-temperature stage (R404A/R22), a low-temperature stage R23, and an ultra-low temperature stage (R14), enabling the provision of a cooling source at an ultra-low temperature of -120°C.