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About cleanroom airflow Analysis
About cleanroom airflow AnalysisI. Turbulence: Air enters the clean room from the air conditioning box through the air duct and clean room air filter (HEPA) and then returns to the clean room through partitions on both sides of the clean room or the moving floor. The airflow is non-linear and exhibits irregular turbulence or vortices. This type is suitable for class 1000-100,000 cleanrooms.Advantages: simple construction, high system construction costs, easy expansion of the cleanroom, and in some special purpose locations, can be combined with a clean bench to increase the cleanroom level. II. Laminar flow: The laminar airflow is in a uniform straight line. The air enters the room through a filter with 100% coverage and returns to the raised floor or partitions on either side. This type is suitable for environments where a higher cleanroom level is required. Typically, cleanroom classes range from 1 to 100. It can be divided into two types: (1) Horizontal laminar flow: Horizontal air is blown out of the filter in one direction and the air is returned by a return air system on the opposite wall. Dust is discharged outdoors in the direction of the wind and is usually heavily contaminated downstream. Advantages: simple structure, stable for a short time after the operation. (2) Vertical laminar flow: The ceiling of the room is completely covered by the ULPA filter and the air is blown from top to bottom to achieve a higher level of cleanliness. Dust generated during the manufacturing process or by employees can be quickly discharged outside without affecting other work areas. Advantages: easy to manage, stable conditions can be achieved in a short time from the start of the operation and are not easily influenced by the operating conditions or the operator. |
