General refrigeration principle of ultra-low temperature circulating cooler The role of the compressor is to compress the working medium from low-temperature and low-pressure gas into high-temperature and high-pressure gas, and then pass through the condenser to condense into low-temperature and high-pressure liquid in the condenser. After the throttling of the throttle valve, It becomes a low-temperature, low-pressure liquid. The low-temperature and low-pressure liquid working medium is sent to the evaporator, absorbs heat in the evaporator and evaporates to become high-temperature and low-pressure steam, thereby completing the refrigeration cycle.
The liquid refrigerant absorbs the heat of the cooled object in the ultra-low temperature circulating cooler, vaporizes into low temperature and low pressure steam, is sucked by the compressor, is compressed into high pressure and high temperature steam, is discharged into the condenser, and is cooled in the condenser to the cooling medium (water Or air) exothermic, condensed into high-pressure liquid, throttled by the throttle valve to low-pressure low-temperature refrigerant, re-enter the evaporator to absorb heat vaporization, to achieve the purpose of circulating cooling. In this way, the refrigerant undergoes four basic processes of evaporation, compression, condensation and throttling in the system to complete one refrigeration cycle.
The necessity of ultra-low temperature circulating cooler is based on the second law of thermodynamics. According to the second law of thermodynamics, the spontaneous flow direction of the internal thermal energy of a closed system is unidirectional, that is, it can only flow from high heat to low heat, and in the microscopic world it can be expressed as micro particles carrying thermal energy. It can only change from order to disorder. Therefore, while a heat engine has energy input to do work, the downstream must also have energy to be released, so that there will be a thermal energy gap between the upper and lower reaches, and the flow of heat energy will become possible and the cycle will continue.
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