Air supply and return of FFU

In the cleanroom environment, FFU (Fan Filter Unit) plays a crucial role, which is the key equipment to realise the air quality control inside the cleanroom.FFU provides stable and highly efficient airflow circulation for the cleanroom through its unique air supply and return system, which ensures the cleanliness and stability of the environment inside the cleanroom.

I. Working principle of FFU air supply system

FFU air supply system is mainly composed of fan, HEPA filter and air supply pipe. When the fan is activated, the air is sucked into the FFU through the air supply pipeline, and then filtered by the HEPA filter, which removes dust, microorganisms and other pollutants in the air, forming clean air. Under the action of the fan, the clean air is evenly sent into the clean room through the air supply outlet on the top of the FFU, providing a continuous and stable source of clean air for the clean room.

FFU air supply system is characterised by its high efficiency and uniformity. The HEPA filter can effectively remove all kinds of pollutants in the air and ensure that the air quality sent into the clean room reaches the preset cleanliness level. At the same time, the design of the air supply outlet on the top of the FFU enables the clean air to be evenly distributed to every corner of the clean room, avoiding the occurrence of local pollution.

II. Working principle of FFU return air system

Corresponding to the air supply system is the return air system of FFU. The return air system is mainly composed of return air outlet, return air duct and return air fan. Inside the clean room, when clean air flows through the clean area, it will carry a certain amount of pollutants and heat. These pollutants and heat need to be discharged from the cleanroom through the return air system to maintain the stability and cleanliness of the cleanroom's internal environment.

When clean air flows through the clean area, it will first be sucked into the return air duct through the return air outlet. In the air return duct, the air will undergo certain pre-treatment, such as cooling, dehumidification, etc., to reduce the temperature and humidity of the air and reduce the impact of the air on the internal environment of the clean room. Subsequently, the pre-treated air will be sucked in by the return fan and discharged to the outside of the cleanroom through the return duct.

The design and operation of the return air system has an important influence on the stability and cleanliness of the cleanroom's internal environment. Reasonable air return system can effectively control the temperature and humidity inside the cleanroom and reduce the influence of air on the clean area. At the same time, the return air system can also effectively discharge the pollutants and heat inside the clean room to maintain the cleanliness and stability of the internal environment of the clean room.

III. Synergy between FFU air supply and air return

In the cleanroom environment, the air supply and return systems of the FFU work together and influence each other. The air supply system provides a continuous and stable source of clean air for the cleanroom, while the return air system is responsible for exhausting pollutants and heat from the clean air to the outside of the cleanroom. The synergy of the supply and return air systems ensures the cleanliness and stability of the cleanroom's internal environment.

In practical application, in order to ensure the stability and cleanliness of the internal environment of the clean room, it is necessary to carry out precise control and adjustment of the air supply and return system of the FFU. By adjusting the size of the supply and return air flow, the layout of the supply and return air outlets, and the operating parameters of the fan, the precise control of the internal environment of the cleanroom can be realised. At the same time, it is also necessary to carry out regular maintenance and repair of FFU to ensure its normal operation and stable performance.

In conclusion, as the key equipment in the cleanroom, the air supply and return system of FFU has an important influence on the stability and cleanliness of the internal environment of the cleanroom. By precisely controlling and adjusting the air supply and return system of FFU, it can ensure the cleanliness and stability of the internal environment of the cleanroom, which provides an important guarantee for the application of the cleanroom.