Layout skills of return air outlet in clean room workshop
Layout skills of return air outlet in clean room workshop
In the design of clean room air conditioning, the design of air distribution is a very important content. The design of air distribution is realized by rationally arranging the air supply, return and exhaust. If the calculation of air supply, return and exhaust is correct but The arrangement of the tuyere is unreasonable and cannot achieve the required effect...
Text label: Clean room air outlet layout, clean room return air layout skills
Clean room workshop delivery and return air outlet layout skills
In the design of clean room air conditioning, the design of air distribution is a very important content. The design of air distribution is realized by rationally arranging the air supply, return and exhaust. If the calculation of air supply, return and exhaust is correct but The arrangement of the tuyere is unreasonable, and the desired effect cannot be achieved. It is only a basic condition to calculate the air volume. Many factors need to be considered for the number of air supply outlets and return air outlets and their arrangement positions. The number of air supply outlets is determined and the model of the air outlet is selected. Currently, many high-efficiency filters are used. The rated air volume is 500m3/ h, 1000m3/h, 1500m3/h air supply outlets, to accurately calculate the air supply volume of the clean room, the number of air supply outlets is the air supply volume divided by the rated air volume of the selected model; you can choose a 1000m3/h air volume For the air supply outlet, you can also choose 2 air supply outlets with 500m3/h air volume. Which model is better to choose depends on the specific situation. Only the airflow organization can meet the requirements; if the aspect ratio of the clean room is not large, an air outlet with a large air volume can be selected, which can not only make the airflow organization meet the cleanliness requirements, but also save investment.
The position of the air supply port should first consider the position of the operating point, and arrange it as far as possible above the process operating point, so that the mainstream area of u200bu200bthe air supply port covers the protected operating point as much as possible; secondly, the balance of the air supply port should be considered. When there are many points and uniform cleanliness is required in the clean room modular, the air supply outlets should be arranged as symmetrically as possible. The purpose of the symmetrical arrangement is to make the airflow spread as evenly as possible and reduce the eddy current area. Similar to the air supply outlet, with the same return air volume, there are options of large return air volume and fewer return air outlets, and small return air volume and more return air outlets. From the perspective of purification effect, it is better to have more return air outlets. The number of return air branches increases, the system is complex, and the cost increases. Therefore, various factors should be considered, such as the number of air outlets, their location, the width and aspect ratio of the clean room, and the cleanliness level. For non-unidirectional flow clean rooms with high cleanliness requirements or clean rooms with a relatively large aspect ratio, the air supply form with small air volume and more air outlets should be selected as much as possible, and the return air outlet should also be selected. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and purification workshops.
In the operation room of the clean clean room modular, the upper-feed and upper-return airflow organization should not be used. In the clean corridor, dressing room and other non-working surfaces, the upper-feed and upper-return airflow organization can be used. It adopts the form of airflow organization with upper delivery side and lower return. There are defects in the air flow organization form of the upper feed and the upper return: at a certain height, there are many large particles of 5 μm, and the cleanliness standard is often measured by the particle concentration of 0.5 μm, but not measured by the particle concentration of 5 μm; In a class 100 clean room, if the upper and last return solution is adopted, the wind speed in the working area is often very small, which is difficult to reach the standard. The dilution effect of the chamber, thus reducing the cleanliness and hygienic effect, tends to contaminate the operating points through which the contaminant particles pass during the ascent. For a clean room with a cleanliness level of 1000, use the form of double-sided downward return air. For a clean room with a cleanliness lower than 1000, when the width of the clean room is not greater than 3m, a single-sided downward return air can be used. When it is greater than 3m When the width of the clean room is large, if the double-side down return air cannot meet the requirements of airflow organization, a return air outlet should be added at 1/2 of the width of the clean room to reduce the eddy current area. In the specific design, it should be flexibly controlled according to the size of cleanliness, the location of the process equipment and other conditions; the general principle of arranging the air supply openings is to adapt to the air supply openings and cooperate with the air supply openings, so that the clean airflow can be fully diffused, and the indoor airflow can be fully diluted and evenly distributed. out of the room.
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