The ventilation system is like the "lungs" of the laboratory, which plays the role of "exchange air". Therefore, the ventilation system must be designed in the laboratory design. In this issue, I will introduce the design requirements of the ventilation system designed in the laboratory.

Specifically, the design requirements of the ventilation system designed by the laboratory are embodied in 4 aspects, namely: the classification of the ventilation system, the determination of the air volume, the design of the ventilation pipe, and the selection of the fan.

Requirement 1: Classification of ventilation systems

Comprehensive ventilation: The so-called "full ventilation" refers to air exchange in the entire room. Exhaust the polluted air in the room in time and add fresh air in.

Local ventilation: The so-called "local ventilation" refers to air exchange in a specific area of the room. Exhaust the polluted air in a specific area in time, and add fresh air in.

Requirement 2: Determine the air volume

The air volume should be determined according to the exhaust air requirements, and the standard requirements of the air volume are different according to the industry in which the laboratory is located. Specifically, the speed, power, and pressure value of the exhaust fan must be determined first, and then the air volume can be determined.

Requirement 3: Ventilation pipe design

If you want to do a good job in the design of the ventilation pipe in the laboratory design, it is best to use a single pipe connection between the fume hood (1 unit) and the ventilator (1 unit). The ventilator is best installed at the end of the pipe, and the shorter the pipe length, the better. The exhaust duct should be as straight as possible, and the higher the duct, the better. If you want to change the wind speed of the air duct, you must be equipped with a corresponding frequency conversion adjustment system.

Requirement 4: Fan selection

To ensure the normal and economic operation of the laboratory ventilation system, a reasonable choice of fans is the key. The fan should be selected according to the nature and purpose of the gas to be transported, and the fan should be able to meet the air volume of the ventilation system and work within the most efficient or economical range of use.

It means that unless the fan cannot meet the air volume of the ventilation system, or the wind pressure and air volume change significantly during operation, it is not recommended to use two or several fans in parallel or series, because each fan will perform better than It is worse when used alone.