Shanghai HanLeng Refrigeration Equipment Co., Ltd. (Shanghai HanLeng Air Conditioning Refrigeration Equipment Co., Ltd.)

Ultra low temperature cascade refrigeration unit (cryogenic unit) -100 ℃~-40 ℃, 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 you need services related to ultra-low temperature cascade refrigeration units (cascade refrigeration units), please feel free to contact us at any time.

Stacked cryogenic unitcharacteristic

When the stacked cryogenic unit is applied in industries such as pharmaceuticals, chemicals, and aerospace heat sink experiments, a refrigerant circulation system is usually required between the ultra-low temperature freezer and the user's load reaction tank. The main reasons are:

1. The load volume of general users is relatively large. 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;

2. The 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;

3. Usually, 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;

4. The refrigerant of the stacked deep refrigeration unit is also a carrier for storing cooling capacity, which can be adjusted by the 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.

5. The heat exchange 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 used in the cascade deep refrigeration unit is generally glacier refrigerant (freezing point -118 ℃), dichloromethane (boiling point 40 ℃, freezing point -95 ℃), alcohol (boiling point 78 ℃, freezing point -114 ℃), non-toxic, non flammable, environmentally friendly, and inexpensive. The circulation of refrigerant adopts a magnetic circulation pump to reduce pollution and the impact of low temperature on bearing sealing.

Stacked low-temperature freezer, ultra-low temperature stacked screw chiller, ultra-low temperature cryogenic freezer manufacturer, Shanghai HanLeng air conditioning manufacturer
Specific application areas of cryogenic units:
1. Pharmaceutical: synthesis, hydrolysis, esterification, etherification and other processes that require temperature control.
2. Chemical industry: distillation and purification, rubber crushing, low-temperature grinding.
3. Metal processing: low temperature assembly, low temperature sticking.
4. Food: Processing and storage of ultra-low temperature foods such as tuna.
5. Electronics: Environmental testing of components.
6. Aerospace: Heat sink experiment, component environment simulation test.
7. Environmental Protection: Waste gas condensation and recycling, net emissions.
Advantages of ultra-low temperature cascade refrigeration unit (cascade refrigeration unit) compared to liquid nitrogen:
1. The cost of using liquid nitrogen is 7-10 times that of using ultra-low temperature cascade refrigeration units; The vaporization heat of liquid nitrogen is 5.6KJ/mol=200kJ, the refrigeration power is 1kw. h, and 18KG=22 liters of liquid nitrogen are required.
2. Low temperature refrigeration units can accurately control temperature, while liquid nitrogen temperature control is more difficult;
3. The transportation and storage of liquid nitrogen are very complicated, and once interrupted, production will stop;
4. The use of liquid nitrogen carries certain risks and requires a license for use. Characteristics of stacked cryogenic units: When used in industries such as pharmaceuticals, chemicals, and aerospace heat sink experiments, stacked cryogenic units typically require a refrigerant circulation system between the ultra-low temperature freezer and the user's load reaction tank. The main reasons are: 1. The load volume of general users is relatively large. 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; 2. The 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; 3. Usually, 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; 4. The refrigerant of the stacked deep refrigeration unit is also a carrier for storing cooling capacity, which can be adjusted by the 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. 5. The heat exchange 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 used in the cascade deep refrigeration unit is generally glacier refrigerant (freezing point -118 ℃) CH2Cl2 (boiling point 40 ℃, freezing point -95 ℃), alcohol (boiling point 78 ℃, freezing point -114 ℃), non-toxic, non flammable, environmentally friendly, and inexpensive. The circulation of refrigerant adopts a magnetic circulation pump to reduce pollution and the impact of low temperature on bearing sealing. Double stacked chiller, low-temperature freezer, cryogenic chiller manufacturer, ultra-low temperature minus 80 degrees freezer manufacturer, water-cooled screw chiller unit. Characteristics: 1. Stable performance. The main unit of the screw chiller unit adopts the third-generation 5:6 asymmetric rotor semi closed screw compressor, motor and compressor, integrated without shaft seal leakage concerns. Two or more compressors are combined with precision control programs to reasonably balance the load of the head components and extend the service life of the unit. Two desktop and multiple compressors use multiple refrigeration circuits. When one circuit needs maintenance, the other circuits can still operate normally and have backup functions. The compressor adopts star delta voltage reduction starting to avoid impact on the power grid. 2. The screw type chiller unit has a compact structure, small footprint, and saves space in the machine room. When the whole machine leaves the factory, it has undergone strict testing and operation, and can reach the state of on-site use. The vibration group has small movement, and the foundation does not require vibration isolation measures, making installation simple. During installation, only the evaporator chilled water pipe and condenser cooling water pipe need to be connected. 3. The low operation and maintenance cost screw chiller can implement intelligent program control according to the load demand: capacity control from 0-25-50-75, which significantly saves energy consumption. The total number of parts in a screw compressor is only one tenth of that of a reciprocating compressor, with a simple structure, few vulnerable parts, insensitivity to wet conditions, and an extremely low failure rate. Built in oil separator, using three-stage oil filtration mechanism, oil and gas separation, wrapped design, can reduce the operating noise of the compressor, and the screw compressor has a fault free operation rate of over 40000 hours. 4. Complete safety protection functions, pressure protection: high voltage protection and low voltage protection, electrical automatic protection device, motor protection: under voltage protection, phase loss protection, reverse phase protection, overload protection, motor overheating protection, oil shortage protection, antifreeze protection: when the temperature of the chilled water is too low, the unit will automatically shut down. Safety valve protection: When the refrigerant pressure exceeds a certain value, the safety exhaust valve will automatically open. 5. The humanized microcomputer control system screw type chiller adopts a LCD touch true color screen, microcomputer control, and a humanized main interface with simple operation and automatic detection of cold water temperature. The system effectively tracks the on-site load by automatically adjusting the compressor energy. The display screen is intuitive and clear, and various data during operation can be read out at any time for reference. When there is a malfunction, it can automatically sound an alarm in a timely manner and display the cause of the malfunction for easy handling. Relevant feedback information can be output to other main control systems according to on-site needs. The original content can be modified according to the needs on site, such as the location of the air conditioner, various protection points of the unit, pressure, etc. 6. Highly applicable and widely used, water-cooled screw chillers are widely used in various fields such as rubber, plastic, petroleum, chemical, electrical, papermaking, textile, brewing, pharmaceuticals, machinery, food, beverage, vacuum coating, electroplating, air conditioning, etc. This model series is commonly used for centralized cooling, which facilitates centralized management. It can be customized as an acid and alkali resistant model to meet the special requirements of customers' special processes. It can be customized as a low-temperature model, combined with low-temperature refrigerant to meet the special needs of customers' special processes.