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For a high and low temperature test chamber to achieve cooling, this is accomplished through compression refrigeration. Compressors are mainly of air-cooled or water-cooled types; another cooling method involves the use of liquid nitrogen. As for how to choose the cooling method for such a test chamber, it depends on the desired test temperature, as different temperatures require different cooling methods. ““Air cooling” refers to natural cooling, and it is generally suitable for low-power products. It is used in impact test chambers where the ambient temperature is low or remains within the range of 5-25°C, and where there is a ventilation system in place. Only in this way can the equipment operate in the most comfortable conditions, thereby extending its service life. “\"Water cooling\" utilizes the thermal properties of water to dissipate heat; for this purpose, a water tank with an appropriate amount of water needs to be installed in the impact testing chamber – generally, 8-16 tons is recommended. The water tank cannot be placed indoors and must be located on the roof or below it. Maintenance of such a system is also rather complicated, as the water pipes need to be properly protected to prevent them from cracking due to exposure to sunlight or freezing. Ultimately, there isn’t really much difference between the two methods, as both serve the purpose of heat dissipation; the difference lies in the way heat is dissipated, and this depends on the customer’s preferences and environmental requirements. At the same time, as manufacturers of high and low temperature shock test chambers, we will also propose the most reasonable solution for you based on on-site assessments. In industrial production, liquid nitrogen is obtained through the distillation of compressed liquid air. It can be used as a cryogenic refrigerant; due to its chemical inertness, it can come into direct contact with biological tissues and freeze them immediately without destroying their biological activity. Moreover, the temperature of liquid nitrogen can reach -196°C. During the development of environmental testing equipment, we used liquid nitrogen as a refrigerant instead of compressors, thereby improving the technology of low-temperature test chambers. A liquid nitrogen cryogenic low-temperature chamber was produced.