Clean room airflow and air volume design and construction
Clean room airflow and air volume design and construction
Clean rooms with different air cleanliness requirements should adopt different airflow patterns. Usually, there are two airflow distribution forms: unidirectional flow and non-unidirectional flow. One-way airflow is the air that is sent into the room to flow in a single direction, and is filtered by the end high-efficiency filter to clean...
Text label: clean room engineering, clean room airflow, clean room design and construction
Clean room airflow and air volume design and construction
Clean rooms with different air cleanliness requirements should adopt different airflow patterns. Usually, there are two airflow distribution forms: unidirectional flow and non-unidirectional flow. The unidirectional airflow is that the air sent into the room flows in a single direction, and the clean air filtered by the high-efficiency filter at the end can replace the suspended particles in the clean room. The airflow pattern adopts unidirectional flow, the unidirectional flow velocity is 0.36m/s-0.45m/s, and the air streamlines should be kept parallel. With a non-unidirectional flow pattern, the clean room air is continuously mixed with the supply air to achieve the required air temperature, humidity and clean room inside, only from a particle point of view, the 'dirty' air in the clean room Continuous mixing with 'clean' air to reduce the load of air particles in the room through turbulent mixing. The high-level area A is realized by unidirectional flow, and the cleanliness of the background B can be in the form of non-unidirectional turbulent air. In this mixed-flow clean room, the air flow should flow from the end with high air cleanliness. Low cleanliness end to avoid contamination risk.
For air cleanliness class B, C, and D clean rooms, the supply air and return air should be preferentially sent from the top to the lower side. The lower side return, the top return air, etc.; the top supply and return air forms are used, and the air volume required to achieve the same air cleanliness level can be lower than the other forms. The biggest advantage of the wind form is that the project is simple and the cost is low, but the sedimentation direction of the suspended particles in the air in this type of air flow is opposite to the updraft of the return air, which affects the timely discharge of dust particles in the air, especially large particles of dust, so it does not work. It is suitable for clean rooms with high air cleanliness level; for rooms with dust emission or harmful substances with a density greater than air in production, even if the air cleanliness level is not high, top-send and top-return air cannot be used. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and sterile rooms.
When calculating the air supply volume, the air flow required to achieve the required pressure difference in the room should also be added; if a process is in a large clean room and the amount of particles generated is small, it is necessary to keep the particles The number of air changes required to be horizontal is reduced. However, the air supply volume of the clean room determined by the number of air changes is usually determined by the room space size and air flow, but is not directly related to the number of particles in the room. The number of times is more related to the particle recovery capacity of the room, rather than the cleanliness level; the calculation of the air supply volume must take into account the offset of the indoor particle generation, and the indoor particle pollution comes from products, logistics and containers, production equipment, operators, building surfaces, etc.; The number of particles generated by the production equipment is generally provided by the manufacturer. The amount of dust generated during the transportation of products, logistics and containers is generally small and negligible compared with the amount of dust generated by the human body. The amount of dust generated is also less, generally accounting for less than 10%. The biggest source of pollution in any clean room is people, and it is also one of the most difficult sources of pollution to control; the generation of particles in the production area varies greatly, especially when there are multiple operations. The minimum 'clean' supply air volume of the clean air conditioning system must be sufficient to offset the instantaneous increase in particle counts when personnel are operating in the same space. The calculation of the air supply volume of the clean room needs to comprehensively consider many factors such as heat, humidity load, dust generation, room airflow organization, and cleanliness of the supply air.
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