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BOKA laboratory ventilation design steps and design

Jan 14, 2019

Laboratory ventilation design plays a very important role in the laboratory. Today we introduce the laboratory ventilation design steps and solutions. Let's take a look at the footsteps of Xiaobian.

lab furniture 9.13

The laboratory ventilation design uses the following steps and solutions:

1. The laboratory ventilation adopts a new air system, and the exhaust of the fume hood is not circulating indoors. Because the laboratory requires the room to be under negative pressure relative to other auxiliary areas. Therefore, the new air volume of the laboratory is designed to be 70%-80% of the exhaust air volume. Another 20%-30% of the fresh air is sent to the laboratory auxiliary room, office, management room, inner walkway, etc., and then added to the room by the gap between the door and window.

2. The laboratory selects a certain number of fume hoods according to the process requirements and functional layout, and some also have some partial exhaust hoods. Usually, the number of air changes is more than 10 times, usually 20-30 times or more, which meets the requirements of the number of air changes. However, the number of air changes is the amount of ventilation calculated according to the maximum opening area of the fume hood. The data and experience show that 100 fume hoods are only used by 18 or less people 99% of the time. Therefore, the ventilation volume and the number of air changes when the minimum opening area of the fume hood should be checked should be checked. If it is less than the number of ventilation times, the integrated exhaust system is added.

3. The air volume balance of the fume hood can be controlled by a constant air volume, that is, the air volume is constant, and the air supply volume and the door and window gaps are constant. This method is suitable for laboratories where the maximum exhaust air volume meets the minimum number of air changes required.

4. For the room with the exhaust air volume much larger than the minimum ventilation requirement, the two-stage ventilation control system can also be used to ensure the air volume balance. According to the displacement signal of the fume hood, the exhaust fan and the blower have two kinds of air supply conditions, and the low air volume is used. The condition is applied to maintain the minimum number of air changes and save energy. In this case, the drug testing institute uses a variable air volume control system. When the air volume of the fume hood changes, the exhaust air volume will also become relatively small. At this time, the exhaust fan placed on the roof is required to be frequency-variated according to the position of the fume hood door, thereby reducing the air volume and ensuring a constant wind speed of the fume hood. At the same time, the automatic control system changes the frequency of the new air blower, reduces the air volume, and maintains the negative pressure balance. Variable air volume systems can reduce system energy consumption. When the maximum and minimum air exchange times of the system are close, consider using a constant air volume system, which makes the system simple and reduces the initial investment.

5. Laboratory ventilation system In addition to the special requirements for the fume hood described above, there are certain requirements and standards for other equipment and control systems. In addition to meeting the exhaust and capture capabilities, the selection of the fume hood should also pay attention to the need to immediately change the air volume according to the movement of the adjustment door to maintain a constant surface wind speed. It is recommended that the measurement and control of the system air volume be determined by taking the door displacement as a signal rather than measuring the surface wind speed. Laboratory Pressure Control and Minimum Ventilation Control In addition to equipment selection factors, ventilation system design and control systems are key factors to ensure that the system's reaction time is short enough (<1 second), and the ventilation system imbalance can result in a fume hood The exhaust and capture capabilities are lost, the airflow flows out of the laboratory, and the pressure inside the building is unstable.

Now through the introduction of VOLAB Walllab's laboratory ventilation system, I believe that you must have a more comprehensive understanding and understanding of the circulation steps, wind speed control, factors to be considered in the design, then there is a need For those who are working on the design of the laboratory ventilation system, please contact us. We have a professional independent research and development team, we will be happy to help you!