There are many methods for air dehumidification, and cryogenic dehumidification, as one of them, has been widely used due to its low energy consumption, simple operation, and easy control. A freeze dehumidifier uses the principle of freeze dehumidification, with a refrigeration unit as the cold source and a direct evaporative cooler as the cooling device, to cool the air below the dew point temperature, precipitate water vapor greater than the saturation moisture content, reduce the absolute humidity of the air, and then use some or all of the condensation heat to heat the cooled air, thereby reducing the relative humidity of the air, Achieve the purpose of dehumidification. Freezing dehumidifiers have the advantages of good dehumidification effect, fast decrease in room relative humidity, low operating costs, no requirement for heat source, no need for cooling water, easy operation, and flexible use. They are widely used in civil air defense engineering, various warehouses, libraries, archives, underground engineering, electronics industry, precision mechanical processing, medicine, food, agricultural seed storage, and various industrial and mining enterprise workshops.

Compared with conventional dehumidifiers, the cooling type dehumidifier adds a water-cooled condenser (water-cooled type) to the refrigeration system Or an outdoor air-cooled condenser (split air-cooled type), the reheater area can be reduced. There are two methods here. One is to place the reheater in front of the water-cooled or air-cooled condenser, arrange it in series with the latter, and control it in multiple ways to adjust the heating amount of the air after cooling and dehumidification, thereby achieving the goal of controlling the outlet air temperature. In addition, the water-cooled type is equipped with a proportional three-way water flow regulating valve, Adjust the cooling water volume, and the air-cooled system is equipped with a condenser air volume control to remove excess heat from the condenser. Another approach is to place the reheater behind a water-cooled or air-cooled condenser, which is also arranged in series. Only by adjusting the cooling water volume through a water-cooled water volume control valve or the condensing air volume through an air-cooled system, can the heat carried away by the condenser be regulated, thereby achieving the goal of adjusting the outlet air temperature.

The air treatment process is similar to the general type, only from the state2To state3The heating capacity can be adjusted, the supply air temperature can be adjusted within a certain range, and it can also handle indoor waste heat.