In this article, there is a detailed description of this theoretical explanation, which is supported by experiments and studies on flow behavior and flow properties in vortex tubes . Visualization of the flow structure and measurements of the high-speed components of the air-driven and water-driven vortex tubes showed that the flow structure was adjusted so that the air flow was divided into two streams according to temperature. In this article, there is a detailed description of this theoretical explanation, which is supported by experiments and studies on flow behavior and flow properties in vortex tubes. Visualization of the flow structure and measurements of the high-speed components of the air-driven and water-driven vortex tubes showed that the flow structure was adjusted so that the air flow was divided into two streams according to temperature.
   The compression refrigeration system consists of a compressor, condenser, expansion valve, and evaporator, which are connected by pipelines into a closed system. The working medium exchanges heat with the object to be cooled in the evaporator, absorbs the heat of the object to be cooled and vaporizes. The generated low-pressure vapor is sucked into the compressor. The compressor consumes energy (usually electric energy) to compress the low-pressure vapor to the required Discharge after high pressure. The high-temperature and high-pressure gaseous working fluid discharged from the compressor is cooled by the normal-temperature cooling medium (water or air) in the condenser and condenses into high-pressure liquid. When the high-pressure liquid flows through the expansion valve, it is throttled and turns into low-pressure, low-temperature wet vapor, which enters the evaporator. The low-pressure liquid is vaporized and refrigerated again in the evaporator.
   The vortex tube is a thermal device that separates the air entering from the nozzle into two air streams with different temperatures. The compressed air injected into the vortex tube from a tangential direction is divided into air streams with a higher and lower temperature than the entering temperature. In this way, the hot and cold air flows are separated only by the vortex tube without additional components. Figure 1 shows the internal structure of a countercurrent vortex tube and the specified flow behavior in the vortex tube. Importantly, because the vortex tube has no other components in the pipe, the separation of two air flows with different temperatures can only be achieved through the action of flow dynamics. In previous studies, vortex tubes have shown a facilitative effect on the separation of cold air, hot air, and mixed air. Compared with other industrial technologies, the main advantages of the vortex tube are the absence of moving parts, small size, low cost, free warranty and adjustable instantaneous refrigeration. These advantages have inspired ongoing research into this simple device. Research on mechanical principles, experiments with the goal of improving the working condition of pipelines and identifying the main factors.