Clean air conditioning internship opening report

Topic category: Design

Student Name: Liu Zhimin

Student ID: XX26160219

Class: 036102

Major: Building Environment and Equipment Engineering

Instructor: Zhao Litie

200 7 March

First, the purpose of the design of this topic:

Air clean technology is a technology that creates a clean air environment. In the mid to late 20th century, air clean technology began to enter the biological and pharmaceutical industries. Unlike ordinary products, medicines are special products related to human health and have extremely strict requirements in the production process. There are clear specifications from raw materials, production processes, equipment, software to personnel operations. In order to prevent the contamination of pharmaceuticals and packaging materials in production, and to make the environmental control and standardized production of pharmaceutical production meet the requirements of pharmaceutical quality, air cleaning technology is indispensable.

With the advancement of science and technology and the development of the economy, people have higher and higher requirements for the comfort of the working environment. The appropriate air environment is a very important factor for a comfortable working environment. The quality of air mainly refers to: air temperature, relative humidity and air cleanliness. In a comfortable working environment, people not only benefit their own health, but also improve work efficiency and ensure product quality.

Therefore, it is of great significance to the design of air-conditioning system in clean production workshops. The clean air-conditioning system in the workshop and the rational design of the workshop-floor purification system have a profound impact on the development of the entire medical industry.

Second, the design status and development trend:

When Jiang Zemin was appointed Minister of the Ministry of Electronics Industry, he pointed out: "...Clean technology is a comprehensive emerging branch of inter-industry, cross-sectoral and interdisciplinary.... We must be good at drawing on and absorbing the existing achievements, experiences and experiences of various industries and disciplines. Strengths... Constantly improve the level of clean technology. With the advancement of science and technology, economic development, the application of clean technology is more and more extensive. Yang Zhenning, a well-known scientist of the Nobel Prize winner, judged at the annual meeting of the China Association for Science and Technology in XX, that in the next two or three decades, the extensive application of 1 wafer, the rapid development of 2 medicines and drugs, and the 3 bioengineering aspects It will become the locomotive of the development of science and technology and is the three strategic directions for the future development of science and technology. To meet these three directions, in addition to the technological needs of the process itself, the most important thing is to challenge the clean environment and create a more clean indoor micro-environment.

Nowadays, modern industrial product production and modern scientific experiment activities require miniaturization, precision, high purity, high quality and high reliability, bringing clean technology along with the development of science and technology and the rapid development of industrial products. And in the food, cosmetics, military and other industries outside the three major strategies have better performance. To create a good clean room micro-environment, a set of efficient, safe, reliable, practical and simple air cleaning system equipment is the focus of development.

The gap between China's clean technology and equipment is far from that of advanced countries. The hepa filter that began to be produced in China in 1965 is 15 years later than abroad. The light scattering dust particle counter, which began production in 1975, is twenty years later than abroad. 0.1 micron clean technology and equipment have become mature technologies in advanced countries in the world, and China has just started. Sub-micron production micro-environment system equipment and technology developed by American asyst company and German mw company using isolation technology have been widely used in recent years. The latest clean technology in the 100 clean clean factory, using the micro-environment of the process equipment to use the isolation technology, the investment ratio is compressed to a high-level micro-environment, eliminating the secondary pollution source of operators and process equipment operation. The effect on the yield and reliability of the integrated circuit is generated.

However, with the rapid development of China's high and new technology and the development of microelectronics industry, optical fiber industry, liquid crystal display industry and optoelectronic device industry, bioengineering and pharmaceutical industry, China's potential huge clean technology product market is 40%~50% per year. The growth rate is increasing.

Third, the design of the key points and difficulties, the proposed approach:

Air conditioning clean engineering should be designed with environmental control in mind. The actual control should consider the following factors: temperature; humidity; air volume; wind speed; pressure; cleanliness; number of colonies cpu; noise; illuminance; static; micro-vibration; medium purity; Self-quiet time; molecular pollution amc; flammable gas, toxic gas concentration. Refer to the "Code for Design of Heating Ventilation and Air Conditioning" and "Code for Design of Clean Plants" and actual work requirements to determine the control range of each parameter.

In order to adjust the indoor air quality, a reasonable air conditioning system design is required. First of all, the most basic is to carry out the load calculation, which is in line with the rationality of the calculation plan and directly affects the accuracy and rationality of the result. The reasonable accuracy of the results directly affects the rationality of the design of the air conditioning system. This calculation mainly relies on the load calculation method of the envelope structure - harmonic reaction method and engineering overview algorithm.

According to the load calculation result, the air supply amount and airflow organization are determined. Strictly in accordance with the requirements of the "clean factory design specifications." Reasonably design the air conditioning system. According to "Industrial Ventilation" and "Air Conditioning", the position of the air outlet is reasonably arranged, the air volume is distributed and the air outlet is selected. In order to achieve the best ventilation with minimal ventilation. Generally, there are many ways to organize the airflow in a ventilated room, such as: sending back, sending back, sending back, and sending air. Calculate the airflow distribution. The following factors are mainly considered: the correction coefficient considering the jet restriction, k1; the correction coefficient considering the jet coincidence, k2; the correction coefficient considering the non-isothermal influence, k3. The current “Code for Design of Heating Ventilation and Air Conditioning” gbj19-87 stipulates that the indoor wind speed in the comfort air conditioning room should not exceed 0.2m/s; in summer, it should not exceed 0.3m/s; in the process air conditioning work area, the wind speed should be 0.2. -0.5m/s. In addition, the outlet velocity uo of the air supply port should take into account the humming sound generated by the high-speed airflow through the tuyere. Therefore, the lower air supply speed should be taken in the room with higher requirements. The general value range is 2-5m/s. The wind speed of the exhaust vent is generally limited to 4m/s or less, and should be no more than 3m/s when it is close to people. Considering the squeaking factor, it is generally taken in the residential building 2m/s, in the industrial building. Can be greater than 4m / s. Design according to the specific situation of harmful sources, workers operating position, hazardous properties and concentration index. Determine by the following principles:

1) The exhaust vent should be as close as possible to the hazardous material source or the area with high concentration of harmful substances, and the harmful substances should be quickly discharged from the room;

2) The air supply port should be as close as possible to the operation site, and the clean air sent to the ventilated room must first pass through the operation site and be discharged to the outside in the contaminated area;

3) As far as possible, distribute the airflow in the entire ventilation room to reduce the eddy current and avoid the accumulation of harmful substances in local areas.

Air conditioning equipment selection: check the "Central Air Conditioning Equipment Selection Manual". This principle should be followed: the selected equipment can meet the working conditions, and it is economically affordable, and will not cause secondary pollution, such as snoring and harmful gases.

Fourth, the design progress plan:

Design preparation stage

After receiving the task book, according to the relevant content of the design object, extensive reference to relevant reference materials at home and abroad. Learn about the latest developments and research methods for air conditioning design in clean production workshops. Initially estimate the air conditioning load and determine the system to determine the original basis for the entire design.

Timeline: Weeks 1 and 2

Write a report on the opening.

Timeline: Week 3

2. Preliminary design stage

The amount of fresh air is determined according to the requirements of air cleanliness. Calculation of cold and wet load: the amount of heat transfer through the enclosure, the amount of heat dissipated by the personnel and the amount of moisture dissipated, the amount of heat dissipated by the heat, and the amount of heat dissipated by the equipment.

Determine the air treatment plan and calculate the required air supply volume: determine the summer and winter air treatment plan, select the air conditioning system, determine the air supply temperature difference and air supply volume, and calculate the fresh air volume, return air volume and air volume.

Primary selection of air-conditioning equipment: Requirements for equipment composition, operating parameters, operation adjustment, etc. under design conditions.

Air conditioning system design: design calculation of air duct, hydraulic calculation of system, selection calculation of air outlet, calculation of airflow organization and calculation of fan coil selection, calculation of winter process check.

In the preliminary design phase, the calculation book, instructions and some design drawings are completed.

Schedule: Weeks 7, 8, 9, 10, 11, and 12

3. Construction drawing design stage

The drawing of the construction drawing is composed of a plan view and a system diagram.

Schedule: Weeks 14, 15 and 16

4. Project budget stage

The project budget is based on the construction drawings and construction plan.

Schedule: Week 17

V. References:

[1] Lu Yaoqing. Practical Heating and Air Conditioning Design Manual. China Building Industry Press.

[2] Zhang Kejun, Zhou Lujun. Design Code for Heating Ventilation and Air Conditioning gbj19-87.

[3] Li Xianzhou, Li Jingtian. "Clean Factory Design Code" gbj19-87.

[4] Sun Yijian. Industrial Ventilation. Third edition. China Building Industry Press. 1994.

[5] Zhao Rongyi, Fan Cunyang. The third edition of "Air Conditioning". China Construction Publishing House. 1994.

[6] Yu Bingfeng. "Central Air Conditioning New Technology and Its Application". Beijing. Chemical Technology Press. XX.

[7] yonggao yin,. experiments studies on the dehumidifier and regenerator of a liquid desiccant cooling system [j]. thermal engineering, 2o00, 2o: 253-267.

Instructor's opinion

signature:

Month Day

Teaching and research section

Department Director:

Month Day