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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.
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.
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