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A rotary dehumidifier is a device that uses the principle of rotating a rotary wheel to absorb moisture and regenerate to reduce air humidity. It is commonly used in air conditioning systems, industrial dehumidification, temperature and humidity control and other fields. The following is a detailed introduction to the working principle of a rotary dehumidifier:
1. Basic components of a rotary dehumidifier
A rotary dehumidifier is mainly composed of the following core parts:
● Dehumidification wheel: The wheel is a key part of the equipment and is usually made of hygroscopic materials (such as silica gel, molecular sieves, or other substances with hygroscopic properties). It rotates continuously during operation and absorbs moisture from the air onto its surface.
● Regeneration system: The regeneration system is responsible for heating the wheel and releasing the moisture on the wheel so that the wheel can regain its dehumidification capacity. The regeneration airflow usually needs to be heated, or high-temperature air is provided by an external heating source.
2. Working principle
The working process of a rotary dehumidifier can be divided into two main stages: the hygroscopic stage and the regeneration stage.
Hygroscopic stage
● The air passes through the pre-treatment filter of the equipment to remove large particles of impurities in the air and ensure that the air is clean.
● When the humid air entering the rotary dehumidifier passes through the rotor, the air comes into contact with the hygroscopic material of the rotor (such as silica gel, molecular sieve, etc.). Hygroscopic materials have strong hydrophilicity, and they can absorb moisture (humidity) in the air onto the surface of the rotor.
● As the rotor rotates continuously, the humid air comes into contact with the hygroscopic material of the rotor and gradually reduces the humidity of the air, and the air becomes dry after passing through the rotor.
● Then, the dry air enters the heat exchanger, and after temperature adjustment, the air is sent out of the equipment to reach the required low humidity.
Regeneration stage
● During the dehumidification process, the hygroscopic material of the rotor will gradually absorb moisture, resulting in a decrease in the dehumidification effect. In order to restore the hygroscopic capacity of the rotor, regeneration is required.
● The regeneration airflow is composed of an external heated air flow, usually hot air or air from a special heater.
● The regeneration airflow passes through another part of the rotor, the hygroscopic material on the rotor is heated, the moisture is released from the surface of the rotor, and the moisture on the rotor evaporates into water vapor and is discharged with the hot air flow.
● In this way, the hygroscopic material will return to its original state and be ready to absorb moisture again.
Rotation of the wheel
● In order to achieve the alternation between the above two stages, the wheel needs to rotate continuously. Usually, the wheel is driven by a motor, and the speed and cycle of rotation are adjusted according to specific needs.
● The rotation of the wheel causes the hygroscopic materials in different areas to alternate between the hygroscopic stage and the regeneration stage, thus ensuring that the dehumidifier can continuously remove moisture from the air.
3. Workflow Overview
1. Wet air enters: Wet air first enters the rotary dehumidifier and flows through the dehumidification wheel.
2. Dehumidification: The wheel absorbs moisture in the air onto its surface, so the wet air becomes dry.
3. Air conditioning: The temperature and humidity of the dry air are adjusted through the heat exchanger, and finally the dry air is sent out.
4. Regeneration process: After the hygroscopic material of the wheel reaches saturation, it is regenerated, and the adsorbed moisture is removed with heated air, restoring the wheel to a state where it can continue to absorb moisture.
5. Repeated cycle: The wheel rotates continuously, completing the cycle of moisture absorption and regeneration to ensure continuous dehumidification of the air.
4. Advantages and applications
● Efficient dehumidification: Due to the large surface area of the moisture absorption material of the wheel, it can handle a large amount of air, and the regeneration process allows the wheel to be reused to ensure efficient dehumidification.
● Low energy consumption: Compared with traditional condensing dehumidifiers, rotary dehumidifiers can still maintain a high dehumidification efficiency in low temperature environments and are suitable for warm and humid environments.
● Flexible humidity adjustment: Suitable for precise control under different humidity requirements, often used in industries, warehousing, laboratories, pharmaceutical production, electronic manufacturing and other occasions with strict humidity requirements.
● Continuous operation: The rotary dehumidifier can achieve continuous and uninterrupted dehumidification through continuous wheel rotation and regeneration process, which is suitable for long-term work.
5. Sum Up
The rotary dehumidifier effectively absorbs and releases moisture in the air through the rotation of the moisture absorption wheel and the heating regeneration process to keep the air dry. It has the characteristics of high efficiency, energy saving and continuous dehumidification, and is widely used in occasions that require precise control of humidity.