Through the actual construction, this paper roughly summarizes the main points of the construction of clean air conditioning system. First of all, we must pay attention to the selection, purchase and storage of materials. In the stage of air-conditioning operation, it is necessary to have clean processing places and clean processing tools, and the processors should have high technical level and good quality. The installation of air ducts should ensure that the construction environment is pollution-free, and the air ducts of the system must be clean and dust-free.
Participants in the installation should wear dust-free clothes, masks and shoes. Appliances and materials used should be scrubbed clean and checked with dust-free paper. The smoke control and exhaust system of the clean room shall not be omitted. Debugging of clean systems must be carefully planned, relevant personnel organized and conducted in accordance with relevant norms.
In recent years, the use of clean air conditioning in scientific research, medical, high-tech product production, laboratory and electronic products, precision instrument production has become increasingly widespread. With the continuous expansion of the use of clean air conditioning, the cleanliness level is also improving. Many clean air-conditioners have been successfully designed and constructed carefully, but some of them have been degraded to use after the design and construction of clean air-conditioning systems fail to meet the requirements of cleanliness, and even scrapped to general air-conditioning systems.
Clean air-conditioning system has high technical requirements, construction quality requirements and large investment. If it fails, it will cause waste in terms of financial, material and human resources. Therefore, in order to do a good job of clean air-conditioning system, besides perfect design drawings, it also requires high-quality and high-level construction. In this paper, through the construction of clean air conditioning project, some experience will be introduced to you for exchange.
1. Material for making air duct is the basic condition for ensuring air conditioning cleanliness.
Material selection. The air duct of clean air conditioning system is usually processed with galvanized steel sheet. The galvanized steel sheet should be of high quality, and the standard of galvanized layer should be more than 314g/m2. The galvanized steel sheet should have uniform coating, no shelling and no oxidation. Galvanized parts shall be used for hangers, reinforcement frames, connecting bolts, Huasi, air duct flanges and rivets. Flexible, dust-free, strong soft rubber or latex sponge shall be used for flange gaskets. Flammable PE boards with capacity of more than 32K can be used for external insulation of air ducts, and special adhesive shall be used. Fiber products such as glass wool shall not be used.
Material procurement. Material procurement must be based on the planned selection of quality assured manufacturer's products in the same product category. In physical inspection, attention should also be paid to material specifications, material smoothness, plate smoothness, corner and square, galvanized layer adhesion, etc. In the course of transportation after purchasing materials, attention should also be paid to keeping intact packaging, moisture-proof, impact-proof and pollution-proof.
Material storage. Clean air conditioning materials should be stored in special warehouses or centralized storage. Storage place should be clean, no pollution source, avoid dampness, especially air valve, tuyere, muffler and other parts should be packaged and stored tightly. Clean air conditioning materials should shorten the storage time of the warehouse, and should be used with the purchase. The sheets for making air ducts should be transported to the site to avoid contamination caused by the moving of parts.
2. To ensure the cleanliness of the system, it is necessary to control the air well.

2.1 Preparations for air conditioning. Processing and manufacturing of air ducts for clean systems should be carried out in relatively sealed rooms. Indoor walls should be smooth, dust-free, dust-free, the ground can be paved with thick plastic floor, floor and wall joint should be sealed with tape to avoid dust generation. Before air duct processing, the indoor must be clean, dust-free and pollution-free. It can be cleaned repeatedly with a vacuum cleaner after cleaning and scrubbing. Tools for making air ducts must be scrubbed with alcohol or non-corrosive detergent before entering the production room. It is impossible and unnecessary for production equipment to enter the production room, but it must be kept clean and dust-free. Workers participating in the production should be relatively fixed. Personnel must wear disposable dust-free caps, gloves and masks when entering the production site. Workwear should be changed frequently. Material for production should be scrubbed by alcohol or non-corrosive detergent for two to three times before it can enter the production site for use.

2.2 Main points of air control in clean system. After processing, the semi-finished products should be scrubbed again and enter the next process. The air duct should be assembled immediately after cutting bite, and should not be put away for a long time. Flange processing of air duct should ensure flange flat, accurate specifications and match with air duct, so as to ensure good sealing of air duct joint.
There should be no transverse joints at the bottom of the duct, and the longitudinal joints should be avoided as far as possible. Large-sized ducts should be made of whole plates to minimize reinforcing bars, and reinforcing bars must be installed, and reinforcing bars in the duct should not be used. The joint angle or corner bite shall be used as far as possible in air control. No button bite shall be used for clean air ducts above grade 6. Corrosion protection must be repaired if galvanized layer at bite, rivet hole and flange welding are damaged. Silica gel should be applied to the flanging cracks of air pipe joints and around rivet holes. The flanging of air duct must be smooth and even. Flanging width and rivet hole, flange screw hole must be strictly in accordance with the specifications. Flexible short pipes must have smooth inner walls. Artificial leather or plastic can be generally used. Soft rubber should be used for air duct inspection.
3. Transportation and installation of clean air duct is the key to ensure cleanliness.
3.1 Pre-installation preparation. Before installing the clean air conditioning system, the schedule must be made according to the main construction procedures of the clean room. The plan must be coordinated with other specialties and implemented strictly according to the plan. The installation of clean air-conditioning system must be completed in Architectural Specialty (including floor, wall, floor) painting, sound absorption, elevated floor and so on. Before installation, air duct positioning and hanging point installation are completed indoors, and the wall and floor damaged by hanging point installation are repaired. (www.iwuchen.com)
3.2 After indoor cleaning, the air duct of the system will be transported in. In the process of air duct handling, attention should be paid to the protection of the head, and surface cleaning should be done before the air duct enters the site.
3.3 Workers participating in the installation shall wear dust-free clothes, masks and shoe covers after being blown. Tools, materials and components used should be scrubbed with alcohol and checked with dust-free paper. Only after meeting the requirements can they enter the construction site.
3.4 The connection of air duct fittings and components should be opened at the end of the head, and the air duct should be free of oil pollution. The flange cushion should be an elastic material which is not easy to aging and can not be joined together by straight seams. After installation, the opening end should remain sealed.
3.5 Air duct insulation should be carried out after the system pipeline installation and air leakage detection are qualified. After insulation is completed, the indoor must be thoroughly cleaned.
4. About the smoke control and exhaust in the clean room.
Clean rooms are generally in a positive pressure state after opening, and clean rooms are well sealed, and the flow of people, logistics channels are tortuous, once
It is found that fire alarm, evacuation and fire fighting are more difficult. At the same time, because the heat of fire source is not easy to emit, indoor materials and materials are warmed up quickly and easily ignited to expand the fire area. At present, the revised draft GB50073-2001 of the National Code for the Design of Clean Workshops stipulates strictly the evacuation corridors, decoration materials and fire-resistant limits of clean rooms, and specifies the fire prevention, explosion-proof measures, fire valve setting, smoke prevention and exhaust measures, fire water supply and automatic spraying of the exhaust system. Therefore, the construction of the smoke control and exhaust system in the clean room must be carried out in accordance with the relevant regulations, especially the smoke control and exhaust pipes and buried parts must be coordinated with the construction profession, synchronously, to ensure that no items are missing.
5. Seriously and orderly commissioning to ensure that the clean air-conditioning system is successfully debugged once.
5.1 After the installation of clean air conditioning system, the air conditioning room and the air conditioning room must be cleaned and cleaned, all irrelevant items must be removed, and the paint on the walls, roofs and floors of the air conditioning room and the room should be carefully checked and repaired, and the filtering system of the equipment should be carefully checked. The air outlet can be installed directly at the end of the air supply system (the system with cleanliness above grade 6 can be installed with high efficiency). Filter), carefully check the electrical, automatic control system, power supply system, confirm that the system is in good condition before commissioning.
5.2 Make a detailed test plan, arrange the personnel to participate in the test, and prepare the necessary workmanship, apparatus and measuring tools.
5.3 Test run must be conducted under unified organization and command. During the trial operation, the fresh air filter is replaced once every 2 hours. The end of the filter with high efficiency should be replaced and cleaned regularly, usually once every 4 hours. Trial operation must be carried out continuously. The data of each air conditioning room and equipment room can be known from the automatic control system and adjusted through the automatic control system. The test run time of clean air conditioning must conform to the time stipulated in GB50243-2002 specification.
5.4 After trial operation, the system can be tested after reaching stability. The test contents include air volume (wind speed), static pressure difference, air filter leakage, indoor air cleanliness level, indoor plankton and sedimentation bacteria, air temperature and humidity, indoor airflow pattern, indoor noise and other indicators. It can also be carried out according to the design cleanliness level or the level requirements under the agreed acceptance status.
6. Construction examples
In recent years, the company has successfully constructed the clean air conditioning system by the above methods. Among them, the cleanliness requirement is higher and the best debugging effect is an electronic product factory in Wujiang, Suzhou, Jiangsu Province. The project is a Taiwanese-funded enterprise with a clean air-conditioning area of 6000 square meters. Among them, 3000 square meters are the processing area of computer pistil shell. The cleanliness level is 7, and the temperature requirement is (+0.2). The humidity requirement is (+5)%. The other 3000 square meters are the computer assembly area, which has a cleanliness level of 6, a temperature requirement of (+0.02), (+1). The air-cooled heat pump central air conditioning system is used in the cleanliness level 7 area, and four clean air conditioners are used (two spare and two spare).
The cleanliness level 6 area adopts the form of DDC six-tube fan coil unit plus fresh air. The fresh air is fed into the room from the elevated floor, and the fresh air branch pipe is arranged in the return air column. Each branch pipe is equipped with an electric regulating valve for automatic control. After careful construction and strict inspection, the project was successfully tested once after commissioning. Grade 6 clean air-conditioning area reached nearly Grade 5 standard, Grade 7 air-conditioning area reached Grade 6 standard. The whole inspection process is carried out by the owner's employing the Taifang inspection team. After the completion of the project, the owner is very satisfied.
In short, to ensure the success of clean air conditioning system construction, the following principles should be grasped:
Strictly control the material procurement and dust-free inspection of the process.
Establish various systems to ensure clean air conditioning construction.
Strengthen the technical and quality education of construction personnel.
All kinds of tools and appliances are available.
Shandong Aide Purification Engineering Co., Ltd. has strong technical strength and construction experience, according to the different needs of clean places, using professional equipment, to form different levels of clean standard space, to create the most suitable production and working environment. At present, it has established close cooperation with many enterprises and is a trustworthy professional purifying project implementer. To learn more about the medical purification industry, please pay attention to the Wechat Public No. Aide-188 (Ed Purification and Oxygen Supply)