Although the principles should be basically the same when formulating the design plan for clean room upgrade and renovation, due to the improvement of air cleanliness level. Especially when upgrading from a non-unidirectional flow clean room to a unidirectional flow clean room or from ISO 6/ISO 5 clean room to ISO 5/ISO 4 clean room. Whether it is the circulating air volume of the purification air-conditioning system, the plane and space layout of the clean room, or the related clean technology measures, there are major changes. Therefore, in addition to the design principles described above, the upgrade of the clean room must also consider the following factors.
1. For the upgrading and transformation of clean rooms, a possible transformation plan should first be formulated based on the actual conditions of the specific clean room project.
Based on the goals of upgrading and transformation, relevant technical requirements, and the current status of the original construction, a careful and detailed technical and economic comparison of multiple designs will be conducted. It should be particularly pointed out here that this comparison is not only the possibility and economy of transformation, but also the comparison of operating costs after upgrading and replacement, and special attention should be paid to the comparison of energy consumption costs. In order to complete this task, the owner should entrust a design unit with practical experience and corresponding qualifications to conduct investigation, consultation, and planning work.
2. When upgrading clean room, priority should be given to various isolation technologies, micro-environment technologies or technical means such as local clean equipment or laminar flow hoods. The same technical means as micro-environment devices should be used for production processes and equipment that require high-level air cleanliness. Clean room partitions with lower air cleanliness levels may be used to improve the overall clean room to a feasible air cleanliness level, while technical means such as micro-environment devices are used for production processes and equipment that require very high air cleanliness levels.
For example, after a technical and economic comparison between the comprehensive conversion of ISO5 clean room to ISO 4 clean room, an upgrade and transformation plan for the micro-environment system was adopted, achieving the required air cleanliness level requirements with a relatively small upgrade and transformation cost. And the energy consumption is the lowest in the world: after operation, each environmental device was tested to achieve comprehensive performance of ISO 4 or above. It is understood that in recent years, when many factories are upgrading their clean room or building new clean room, they have designed and constructed the production plants according to the ISO 5/ISO 6 level unidirectional flow clean room and implemented the high-level processes and equipment of the production line. Level cleanliness requirements adopt micro-environment system, which reaches the air cleanliness level required for product production. It not only reduces investment costs and energy consumption, but also facilitates the transformation and expansion of production lines, and has better flexibility.
3. When upgrading clean room, it is often necessary to increase the storage air volume of the purification air-conditioning system, that is, to increase the number of air changes or average air velocity in clean room. Therefore, it is necessary to adjust or replace the purification air-conditioning device, increase the number of hepa box, and increase the air duct ruler can be used to increase the cooling (heating) capacity, etc. In actual work, in order to reduce the investment cost of clean room renovation. To ensure the adjustments and changes are small, the only solution is to fully understand the product production process and the original purification air-conditioning system, rationally divide the purification air-conditioning system, use the original system and its air ducts as much as possible, and appropriately add necessary, renovation of purified air-conditioning systems with less workload.
Post time: Nov-07-2023