Analysis of unqualified clean room construction indicators - common problems

Analysis of unqualified index of clean room construction

Clean room design and installation and construction are relatively technical tasks. In order to ensure the smooth completion of the project, it is very important to choose a professional company. The professional company will be equipped with professional and technical personnel for design and professional construction personnel Installation, perfect after-sales service...

Text tags: clean room unqualified analysis, clean room construction indicators, clean room problem analysis, Zhongjing Global Purification

Analysis of unqualified indicators of clean room construction

Clean room design and installation and construction are relatively technical tasks. In order to ensure the smooth completion of the project, it is very important to choose a professional company. The professional company will be equipped with professional and technical personnel for design and professional construction personnel Installation and perfect after-sales service can avoid many problems after the project is completed. At present, the professional and technical personnel in charge of purification in Zhongjing Global are conducting a sub-analysis on the construction of clean rooms from a professional point of view, so as to help everyone avoid problems in the construction of clean rooms.

There are many reasons for the unqualified cleanliness of the clean room, from the entry of external pollution sources, the control of indoor pollution and the retention of pollutants, to analyze whether the air supply volume is insufficient, whether the air distribution is reasonable, and the size of the indoor positive pressure. The air supply volume for purification is too small: the cross-sectional wind speed of the one-way flow clean room is less than 0.25m/s, which is not enough to overcome the pollution caused by the rising of hot air; for the non-one-way flow clean clean room modular, the system resistance is too large, and the corresponding dilution air volume is insufficient . Unreasonable airflow organization: the supply air flow does not fully cover the working area, the positions of the supply and return air outlets are unreasonable, and there are higher and larger eddy current areas; the airflow deflection angle of the one-way flow clean room is too large, and the return air grille The area is small, the return air speed is high, and the return air is not smooth; the positive pressure in the room cannot be maintained, and the surrounding polluted air infiltrates. The initial effect, the medium effect, especially the high-efficiency filter has leakage phenomenon: the unsealed filter installation causes the cleanliness of the clean clean room modular to exceed the standard; the leak detection work before and after the installation of the high-efficiency filter is not perfect or not done.

The positive pressure value of the clean room is unqualified: the positive pressure exhaust air volume does not match the clean room air leakage volume, the calculation of the fresh air volume and the exhaust air volume is incorrect; the sealing degree is too poor, the air leakage volume is too large, and the positive pressure cannot be maintained; The differential control system fails, the residual pressure valve does not act, cannot be opened, and the positive pressure of the clean room cannot be controlled. Unqualified air supply volume of clean room: wrong design air supply volume, wrong selection of air volume and air pressure of air supply fan; wrong calculation of pipe network resistance, excessive pipe network resistance, improper use of static pressure box, primary and medium efficiency filters The filtration area is too small, the filtration speed is too large, and the resistance loss is too large; the construction is unqualified, the air leakage of equipment and pipes is too large, the safety margin of the fan is insufficient, and the small air supply volume not only affects the cleanliness, but also affects the temperature and humidity. . Unqualified temperature parameters of clean room: the calculation of heat load is wrong or poorly considered, and the air supply volume is not enough to eliminate the residual heat and residual humidity in the clean room modular; the selection of cooling or heating equipment is unreasonable, or the combination of various functional sections of air handling equipment is incorrect; There is a problem with the supply of the cold source and heat source, the supply parameters are incorrect or the supply is insufficient; there is a problem with the automatic control system, the instrument reflects the error, the accuracy is too poor, the action fails or does not reflect the real temperature value at all; there is a problem with the airflow organization, Also affects temperature parameters. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean workshops.

Unqualified relative humidity parameters of clean room: the calculation of heat and humidity load is wrong or poorly considered, the air supply volume is not enough to eliminate the residual heat and residual humidity in the room; the supply of cold source, heat source and humidification source has problems, and the supply parameters are not Correct or insufficient supply, the temperature of the chilled water does not reach the temperature required for dehumidification or the air temperature before equal enthalpy humidification is low; the selection of cooling, dehumidification or heating, and humidification equipment is unreasonable, or the various functions of air treatment equipment Section combination is incorrect; there is a problem with the automatic control system, the instrument reflects errors, the accuracy is too poor, the action fails or the actual temperature and humidity values u200bu200bare not reflected at all; there is a problem with the airflow organization, which will also affect the humidity parameters. The noise of the clean room exceeds the standard: the calculation of noise reduction is wrong or not calculated at all, the selection of noise reduction equipment is improper or the noise reduction equipment is unqualified, and the noise reduction effect cannot be achieved; the air flow rate in the supply and return air pipes of the air conditioning purification system exceeds High; the noise of the noise source exceeds the order specification.

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