1. The barrel body is made of stainless steel, which improves the oxidation resistance of the barrel body and prolongs its service life. 2. The heat exchange design of large-area copper pipes increases the exhaust temperature of the refrigeration and dryer, and the exhaust pipe does not condense, which prolongs the service life of the pipe; reduces the intake temperature of the evaporator, reduces the load of the refrigeration compressor, and is more energy-saving. 3. Optimize piping design, increase the number of heat exchange tubes, and reduce the pressure difference of the whole machine. 4. Hot gas bypass valve with large refrigeration capacity is selected or frequency conversion design, no frost, no ice blocking at low temperature. 5. The air-water separation design of primary filtration and cyclone separation achieves 999% separation effect. 6. The selection of high-quality accessories can improve the stability of the system, extend the service life of the whole machine, and provide users with a better quality air source. 7. Intelligent PLc control system, touch screen display operation, multi-point temperature measurement, pressure measurement, real-time monitoring of the operating conditions of the refrigeration dryer, more comprehensive display and protection; more stable system control