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Central air-conditioning installation project in clean room


无尘车间中央空调安装工程 Central air-conditioning installation project in Dongguan clean room

Overall ventilation has different interpretations and calculations in different applications. If the goal is to control indoor air quality (IAQ), the overall ventilation is to provide fresh air and maintain the appropriate temperature and humidity to achieve comfort. When controlling the operating environment as a premise, it is diluted with fresh air. Polluted air for industrial safety and hygiene purposes. Because air has the characteristics of flowing from high pressure to low pressure, in order to consider the distribution of airflow in the plant and avoid the accumulation of harmful substances in poorly ventilated locations, we generally hope that the supply and exhaust air are mechanically enforced and passed through the supply and exhaust pipes. It is a design arrangement to dilute the concentration of harmful substances. If properly designed, it is extremely effective in the elimination of low-concentration non-toxic or low-toxic pollutants that occur in small amounts and are widely distributed. In terms of pollution control benefits? According to the ACGIH (American Conference of ^ *** al Industrial Hygienists) study, the overall ventilation is less suitable for dust or smoked workplaces, because its toxicity is usually less Big. If the overall ventilation device is used, a large amount of ventilation is required, and the speed and amount of dust and fume generation are generally large, so it is extremely easy to control the local high concentration situation. Therefore, this type of system ventilation is not a design that ventilation design engineers will consider first, but this device is a very practical solution to the situation where the sources of pollution and harmful substances are uniform and widespread or the location is uncertain. Considering the overall ventilation design required for different pollution sources in different environments, we must first consider the calculation of the ventilation volume. The current calculation method of the overall ventilation volume depends on (1) the number of operators (2) the size of the workplace space (3) evaporation Rate, Threshold Limit Value (TLV) and Lower Explosive Limit (LEL) and other conditions are estimated separately.

The air hood is the opening part of the local exhaust system. Its role is to limit or reduce the diffusion of pollutants from the source, and guide the air flow to capture the pollutants in the most effective way, and then transport them to the air purification device through the duct for discharge. . Whether the local exhaust device is good and effective is related to the type and location of the air hood, and it has a great impact on the ventilation system in terms of economy and engineering. Taking dust as an example, after the dust source has been determined and quantified, engineering and economic evaluation can be started. The standard dust-proof local exhaust system includes air hoods, guide ducts, and dust collection filters at each dust generation source. Device and fan motor. Generally speaking, the closer the dust collection air hood is to the dust source, the better the economic benefits of the system; the further away the air hood is from the dust source, the worse the dust collection rate and the greater the demand for exhaust air volume. Basically, the size and cost of the dust protection system are directly proportional to the amount of polluted air transferred. Each dust-generating machine should be evaluated separately. How to correctly estimate the amount of air transferred is an effective and economical dust prevention operation. Therefore, the design of the air hood is very important. The key. If the air hood is not well designed, not only the dust cannot be effectively controlled, but the initial dust dissipation will prevent visibility, affect the health of workers, increase the recurring costs of dust cleaning of the factory structure, and increase the excessive mechanical wear caused by dust. Electrical and electronic components Damage repair costs. Not only the energy used for system operation is wasted, but also the danger of fire is increased, so the overall economic benefits are greatly affected. Therefore, at the beginning of the system design and planning, it is necessary to choose an appropriate size and type of air hood according to the operating method and the diffusion situation, and at the same time correctly evaluate the exhaust volume and pressure loss, and control the wind speed, etc., so as to make an appropriate system design.

As ventilation control engineering is widely used in various industries, from the traditional wood industry, heat treatment operations, pickling industry, sandblasting industry, hot-dip galvanizing industry, grinding industry, mixing industry and petrochemical industry, paint industry, plastic Industry, rubber industry, etc .; even process machines in the optoelectronics and semiconductor industries such as wet scrubbers and local scrubbers use ventilation systems (integrated ventilation and local exhaust systems) to capture and dispose of the harmful effects of the process. substance. As ventilation control systems are widely used in the industry, ventilation technical guidance is becoming increasingly important. In the past cases of coaching manufacturers, it was often found that due to improper design of the ventilation system, or regular inspections and maintenance, so that the system could not achieve its expected function, the industry not only wasted a lot of resources and costs, but also failed to effectively improve environmental quality With the safety and health of employees.



Related links: Dongguan air-conditioning purification project, Dongguan dust-free purification equipment, Changan central air-conditioning project, low-voltage power distribution project, Dongguan purification ventilation project, Dongguan dust-free purification project, hydropower installation project, Dongguan 100,000-level dust-free workshop, Dongguan City Power Xiang Air Conditioning Purification Engineering Co., Ltd.

Article source: http://jimesale.com Tan Yuming 13751461639



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