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How does the airflow pattern of a clean room affect its performance and cleanliness?
How does the airflow pattern of a clean room affect its performance and cleanliness?The airflow pattern of a clean room mainly includes unidirectional flow and non-unidirectional flow (turbulence). Different airflow patterns have different impacts on the performance and cleanliness of a clean room, as follows:Unidirectional flow Airflow characteristics: Unidirectional flow airflow flows in a single direction at a uniform speed, pushing the air forward like a piston, so that indoor pollutants are "washed" out of the clean room. Impact on performance and cleanliness Efficient removal of pollutants: can quickly remove indoor pollutants, and effectively avoid the spread and accumulation of pollutants in the room, so as to maintain high cleanliness. For example, in the photolithography process of semiconductor chip manufacturing, the use of unidirectional flow clean rooms can ensure that the surface of the silicon wafer is not affected by particle contaminants and ensure photolithography accuracy. Stable and clean environment: the direction and speed of the airflow are stable, and it is not easy to produce eddy currents and dead angles, which provides a stable and clean air flow environment for the production process, which is conducive to improving the consistency and stability of product quality. Strong self-purification ability: Even if a small number of pollutants enter the clean room, the unidirectional airflow can quickly discharge it, so the clean room has a strong self-purification ability and can be restored to a high cleanliness state in a short time. Non-unidirectional flow Airflow characteristics: Turbulence The flow direction and speed of the airflow are irregular, and the air flows in the room in a mixed manner. Impact on performance and cleanliness Certain dilution effects: constantly mixing clean air with indoor air, can dilute pollutants to a certain extent and reduce the concentration of pollutants, which is suitable for occasions with relatively low cleanliness requirements, such as the assembly workshop of ordinary electronic equipment. There are airflow dead corners: due to the irregular air flow direction, it is easy to form airflow dead corners in the room, and the airflow in these areas is slow, and pollutants are easy to accumulate, resulting in a decrease in local cleanliness. Self-purification ability is relatively weak: compared with unidirectional flow, the self-purification ability of a turbulence-clean room is poor, the pollutant discharge speed is slow, and when more pollutants are produced in the room, the cleanliness needs a longer time to return to a stable state. In addition, there is an airflow pattern between unidirectional and non-unidirectional flow - mixed flow (also known as local unidirectional flow). This airflow pattern is based on the turbulence clean room and adopts unidirectional flow in key areas, which can not only meet the high cleanliness requirements of key areas but also reduce the cost and operation energy consumption to a certain extent. For example, in some pharmaceutical workshops, local unidirectional flow is used in aseptic filling areas, while turbulence is used in other auxiliary areas to achieve a balance between overall cleanroom performance and cost. |
