Used refrigeration equipment refers to refrigeration devices that have already been put into use in commercial or industrial settings, and after professional cleaning, leak detection, maintenance, repair, or complete refurbishment, can still stably achieve heat transfer, cooling, refrigeration, freezing, and constant temperature control. These devices are widely used in cold-chain logistics, food processing, hotel catering, chemical and pharmaceutical industries, cold storage warehousing, supermarket freshness preservation, industrial production temperature control, and other fields. Common types include chillers, cold storage units, air conditioning units, quick-freezing equipment, refrigeration compressors, condensing units, heat exchangers, and more.

I. Technical Principle

The equipment is based on the vapor-compression refrigeration cycle as its core principle: the compressor compresses low-temperature, low-pressure refrigerant into high-temperature, high-pressure gas; the refrigerant then releases heat to the outside through the condenser and condenses into high-pressure liquid; next, the throttling device reduces the pressure and temperature, allowing the refrigerant to enter the evaporator where it absorbs heat from the cooled space or medium, turning into low-temperature, low-pressure gas and returning to the compressor, thus completing the cycle and continuously achieving cooling, refrigeration, constant temperature, or freezing effects. The system is usually equipped with components such as fans, water pumps, heat exchange coils, expansion valves, temperature controllers, and pressure protection switches. Some large-scale units use screw-type or centrifugal compressors to meet greater cooling capacity requirements.

II. Performance and Condition Indicators

1. Cooling Capacity: The cooling capacity of the unit can range from several kilowatts to several megawatts. After maintenance, the actual cooling capacity can be restored to 85%–95% of the rated value, meeting the cooling needs under design operating conditions.
2. Temperature Control: It can stably maintain temperatures within the range of **-60℃ to 15℃**, with temperature control accuracy typically reaching ±0.5℃ to ±2℃, which meets the requirements of various processes such as freshness preservation, refrigeration, freezing, and industrial cooling.
3. Operating Parameters: Key operating data such as compressor discharge pressure, suction pressure, current, evaporation temperature, and condensation temperature are all within safe standard ranges, with no abnormal leaks, unusual noises, or overloads.
4. Materials and Sealing: Heat exchangers and pipelines are mostly made of copper tubes, aluminum fins, or stainless steel materials. Air-tightness has passed pressure testing, with no obvious refrigerant leakage, and energy efficiency is close to that of new equipment.
5. Safety and Compliance: The unit is fully equipped with high- and low-pressure protection, overload protection, freeze protection, temperature alarms, and other devices, which are all effective. After refurbishment, it can operate stably and continuously, meeting commercial and industrial refrigeration usage standards.

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