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>The first paragraph: The two-stage semi enclosed compressor is suitable for deep cold working conditions from -40 ℃ to -65 ℃. With the same storage capacity, it has an 18% increase in refrigeration efficiency compared to single-stage low-temperature models, making it the mainstream choice for quick freezing, freeze-drying, and pharmaceutical deep cold storage.
The two-stage semi closed compressor relies on two-stage compression to reduce the single-stage pressure ratio. At an evaporation temperature of -60 ℃, when the single-stage piston pressure ratio exceeds 12, the volumetric efficiency rapidly decreases. The two-stage structure can control the single-stage pressure ratio within 3.5. A stable pressure ratio range can reduce exhaust overheating, valve plate loss, and extend the operating life of the main engine. The Xitelide two-stage semi closed piston model is widely used in quick freezing tunnels and freeze-drying machine supporting projects.
The capacity and insulation parameters of the cold storage determine the benchmark for compressor horsepower. When using 100mm polyurethane cold storage panels for a 100 cubic meter minus 60 ℃ cold storage, it is recommended to configure 8-10 horsepower two-stage semi enclosed compressors. In the scenario where the thickness of the insulation board is less than 80mm, the cooling load will increase by about 25%, and it is necessary to select a higher level to avoid long-term full load operation.
Refrigerant adaptation is an essential step in export projects. R23, R404A, and R507 are high-frequency refrigerants used in cryogenic projects. R23 is mostly used in ultra cold scenarios below -70 ℃, and seals and refrigeration oil must be matched with the refrigerant one by one. Mixing different types of refrigeration oil can cause carbon deposition in the oil circuit within 300 hours. In Southeast Asian foreign trade orders, inquiries for R404A dual level models account for over 62%.
There is a fixed ratio for matching the two-stage semi enclosed compressor with the air cooler and condenser. It is recommended to increase the heat transfer area of the condenser by 30% under low-temperature conditions according to the conventional medium high temperature cold storage. Controlling the condensation temperature within 35 ℃ can reduce the energy consumption of the unit by 12%. Many overseas engineering companies are prone to directly apply the preservation warehouse matching scheme, resulting in frequent shutdowns of high-pressure protection.
Screw refrigeration compressors can also be used as low-temperature models, but the procurement cost for -60 ℃ cryogenic scenarios is more than 40% higher than that of piston two-stage models, and the economic feasibility of small capacity cryogenic projects is relatively weak. Screw is more suitable for large cold chain logistics warehouses with continuous operation and stable load of over 50 horsepower, while the two-stage semi closed piston has a lower maintenance threshold and stronger universality of accessories, suitable for markets with limited maintenance resources in Africa and Central Asia.
When selecting, it is necessary to confirm the power supply system. Southeast Asia has 415V/50Hz, some regions in Central Asia have 380V/50Hz, and some regions in the Americas have 460V/60Hz. The motor winding and wiring scheme must be confirmed in advance to avoid the inability to power on and debug after arrival. The Xitelide two-stage semi enclosed compressor supports customized multi voltage versions to meet the differentiated needs of foreign trade procurement.
The maintenance cycle follows the industry standard and operates under full load and low temperature conditions. The refrigeration oil is checked and the oil filter is replaced every 2000 hours; The inspection cycle for valve plates and piston rings should not exceed 8000 hours. The pressure difference of the medium in deep cold working conditions is large, and the wear rate is higher than that of medium high temperature preservation compressors.
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FAQ
What is the minimum stable evaporation temperature for a two-stage semi enclosed compressor? Conventional models can reach a stable temperature of -60 ℃, while customized models support -70 ℃.
Can a single-stage low-temperature compressor be used in a minus 60 ℃ cold storage? Not recommended, the pressure ratio exceeds the standard, the efficiency is low, and the failure rate significantly increases.
Can the refrigerant R23 and R507 of the two-stage compressor be interchanged? No, the oil circuit and sealing material designs are completely different.
Which is easier to maintain, a two-stage semi enclosed compressor or a screw low-temperature machine? The popularity of dual stage piston accessories makes it easier for overseas repair technicians to get started.
5. What size condenser is required for a 100 cubic meter minus 60 degree cold storage? The heat exchange area is increased by more than 30% compared to the fresh-keeping cold storage.
What voltage is preferred for exporting two-stage compressors to Central Asia? Priority is given to 380V 50Hz three-phase, suitable for local industrial power supply.
How long does it take to sample and test the refrigeration oil of the compressor under cryogenic conditions? Suggest taking samples after 1000 hours to observe changes in acidity and viscosity.
