Shanghai HanlengUltra-low temperature cascade refrigeration unit（Cryogenic low-temperature unit）-120℃to-40℃It is widely used in high-tech and R&D fields such as aerospace, research institutes, chemical and pharmaceutical industries, new materials, superconductivity, and environmental protection. Create huge economic benefits for users, and win the favor and recommendation of customers with its excellent performance and perfect service. If needed, ultra-low temperature cascade refrigeration unit(Stacked refrigeration unit)Related servicesPlease contact Shanghai HanLeng.
Specific application areas of cryogenic units:
　　1Pharmaceutical: synthesis, hydrolysis, esterification, etherification and other processes that require temperature control.
　　2Chemical industry: distillation and purification, rubber crushing, low-temperature grinding.
　　3Metal processing: Low temperature assembly, low temperature sticking.
　　4Food: Processing and storage of ultra-low temperature foods such as tuna.
　　5Electronics: Environmental testing of components.
　　6Aerospace: Heat sink experiment, component environment simulation test.

7Environmental Protection: Waste gas condensation and recycling, net emissions.

Ultra-low temperature cascade refrigeration unit(Stacked refrigeration unit)Advantages compared to liquid nitrogen:
　　1The cost of using liquid nitrogen is the electricity cost of using an ultra-low temperature cascade refrigeration unit7-10Double; The heat of vaporization of liquid nitrogen is5.6KJ/mol=200kJ/kgThe cooling power is1kw.h, requires consumption18KG=22Liquid nitrogen in liters.
　　2Low temperature refrigeration units can accurately control temperature, while liquid nitrogen temperature control is more difficult;
　　3The transportation and storage of liquid nitrogen are very complicated, and once interrupted, production will stop;
　　4The use of liquid nitrogen carries certain risks and requires a license for use.
Application of refrigerant:
Ultra-low temperature cascade refrigeration unit(Stacked refrigeration unit)When applied in industries such as pharmaceuticals, chemicals, and aerospace heat sink experiments, it is usually used inUltra-low temperature freezer(Stacked refrigeration unit)A refrigerant circulation system is required between the load reaction tank and the user. The main reasons are:
　　1The load volume of general users is relatively large, and if the load requires uniform temperature, it must be filled with refrigerant. However, at room temperature, a large amount of low-temperature refrigerant will turn into gas, and the volume and pressure of the gas will be huge, which the equipment itself will not be able to meet;
　　2The load on the user's site is far away from the refrigeration room, and the load area is usually a clean, explosion-proof, and quiet area. The refrigerant circulation system can separate the cryogenic unit and the load area, making the entire system safer and more reliable;
　　3Usually, the cooling capacity is achieved by cooling the materials inside the load through the heat exchange coils. Once the heat exchange coils leak, it may contaminate the materials. The refrigerant system usually uses substances that are in contact with the material solvent, so even if there is a leak, the possibility of contamination can be completely avoided;
　　4Refrigerant is also a carrier for storing cooling capacity, which can be adjusted by refrigerant when the load changes significantly. This is beneficial for temperature control and energy conservation. Generally speaking, the greater the load fluctuation, the more refrigerant is required.
　　5The heat transfer efficiency is higher than that of liquid nitrogen. Liquid nitrogen uses latent heat of evaporation to release cooling energy. After absorbing heat, liquid nitrogen becomes gaseous, and a mixture of vapor and liquid phases occurs inside the coil, resulting in significant gas resistance and a sharp decrease in flow rate. This prevents liquid nitrogen from fully contacting the tube wall, greatly reducing heat transfer efficiency.
The refrigerant generally uses glacier refrigerant (freezing point)-118℃）Dichloromethane (boiling point)40 ℃, freezing point-95 ℃）Alcohol (boiling point)78 ℃, freezing point-114 ℃）Dichlorofluoroethane (boiling point)32 ℃, freezing point-103 ℃）Trifluorodichloroethane (boiling point)28.7 ℃, freezing point-107 ℃）Difluorochloroethane (boiling point)-10 ℃, freezing point-131 ℃）Non toxic, non flammable, environmentally friendly, and affordable. The circulation of refrigerant adopts a magnetic circulation pump to reduce pollution and the impact of low temperature on bearing sealing.

Performance characteristics of ultra-low temperature cascade refrigeration unit:
　　1 Temperature adjustment range:-60 ℃Or-120 ℃To+100 ℃Temperature control accuracy± 1 ℃.
　　2 Refrigeration:Adopting cascade refrigeration, cooling capacity:1 To1000KWAvailable for selection.
　　3 Control System: ProgrammablePLCAdd touch screen
　　4 haveRS485、R232Interface, which can communicate with computers to receive computer settings, control, and transmit measured temperatures to the computer.
　　5 Imported heat transfer fluid can be selected
　　6 The transmission pump adopts a magnetic pump, which has no leakage, no pollution, and high head
　　7 Sealed and pressurized storage tanks and pipelines,Prevent refrigerant evaporation, condensation, and freezing, and have liquid level indication
　　8 For small load heating, the hot gas bypass of the compressor can be used to heat the load
　　9 Multiple alarm protections: water interruption, high water temperature, circulation pump failure, compressor overheating, high pressure, overcurrent, phase loss, phase continuity, etc
　　10 Cooling method: Air cooling or water cooling can be selected, and the air-cooled condenser can be placed outdoors
Due to the wide range of industries and applications in which ultra-low temperature cascade refrigeration units are used, it is not possible to fix the model, and most of them need to be customized according to the actual situation of the user. We may ask the following questions:
1 What temperature is required? What is the required volume?
2 What materials are being processed? What is the weight? What are its specific heat capacity, vaporization heat, and solidification heat?
3 How long does it take to cool down or heat up? Each production cycle?
4 Other heat losses: reaction heat, stirring heat, circulation pump, pipeline, storage tank;
Based on the answer to the question, both parties will discuss the best solution.
Shanghai HanlengUltra-low temperature cascade refrigeration unit(Stacked refrigeration unit)The main components are all made of world-renowned brands, such as: compressors mainly use Copeland, Bitzer, Danfoss, Alfa Laval, Siemens, Schneider, etc. Large systems use screw compressors and are equipped with economizers to improve system efficiency. The small system adopts a semi closed piston compressor. The evaporator of the cryogenic unit adopts stainless steel plate heat exchanger, which enables cryogenic operationUltra-low temperature freezer(Stacked refrigeration unit)Provide maximum efficient heat transfer area in a compact space.