The control of laboratory ventilation system is a technology to study the effects of hazardous substances on indoor and outdoor air environment. The basic composition of laboratory ventilation system consists of the following two parts:
1, ventilation terminal equipment: mainly includes fume hood, universal exhaust hood, atomic absorption hood, blow and blow hood.
2, ventilation piping system: there are fans, air pipes, air valves, mufflers, waste gas treatment towers, etc.
In the normal operation of the system, the ventilation volume of the laboratory and the air volume of the tuyere are basically fixed, and it can meet the requirements of the use, but when the surrounding environment changes, the original system can not adapt to the change situation. The old ventilation control system is based on the traditional relay control system. In order to realize the automatic control of the ventilation system, it is necessary to rely on a point of necessary automation products to achieve.
A perfect laboratory ventilation system must have two basic functions: safety and energy saving. In the process of effective emission, a large number of harmful gases are produced. Excessive emissions of indoor air without control means ineffective energy consumption. The perfect laboratory ventilation system is inseparable from control, and the intelligent control system is called VAV system.
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