What is ventilation in the lab?

Laboratory ventilation system is one of the largest and most influential systems in the entire laboratory design and construction process. A scientific and reasonable ventilation system requires good ventilation, low noise, easy operation, energy saving, and even requires indoor pressure difference and temperature and humidity to maintain the comfort of the human body.

What are the design principles of fume hoods?

1. According to the structural characteristics of the building, open air wells nearby, divide the exhaust and air supply systems, and achieve "short, smooth, smooth and straight" piping systems to reduce system resistance and system noise;

2. The exhaust air and air supply system achieve the balance of air volume, maintain the negative pressure of -5Pa--10Pa indoors, prevent the escape of harmful gases, and ensure the physical and mental health of the experimenters;

3. Supply cold air in summer and warm air in winter to ensure the comfort of indoor temperature and humidity;

4. Adopt intelligent frequency conversion control system to achieve the purpose of convenient operation, energy saving and noise reduction;

5. Comprehensively considering various factors, adopt mature technology with less investment, stable operation, low operating cost and good operating effect;

6. The selected process must meet the on-site conditions, the plane layout is simple, compact, occupies less space, and is convenient for production operation and maintenance;

7. Non-standard equipment should comply with relevant national or industry specifications, and ensure stable performance and beautiful appearance;

8. Fully consider noise, odor, etc. in the design to prevent secondary pollution and not cause new pollution to the surrounding environment;

9. The treatment facilities have the impact load capacity to ensure that the exhaust gas is discharged up to the standard.

Design parameters of fume hood

1. The wind speed in the branch pipeline is 6～8m/s, and the wind speed in the main pipeline is 8～14m/s;

2. Design air volume of ventilation equipment:

Fume hood surface wind speed: 0.3～0.8 m/s, single 1200*800*2350 fume hood design air volume 1500m3/h, single 1500*800*2350 fume hood design air volume 1800m3/h, single 1800*800*2350 ventilation The design air volume of the cabinet is 2200m3/h, the wind speed of the universal extraction cover: ≥0.35 m/s, the exhaust air volume of the universal extraction hood is 150～350 m3/h, the wind speed of the atomic absorption cover: ≥0.35 m/s, the exhaust air The volume is 350～600 m3/h.

3. The number of air changes:

General chemical laboratory ventilation rate: 8 to 12 times/hour

4. The terminal noise of the ventilation system is less than or equal to 62db.

5. The fan adopts corrosion-resistant FRP centrifugal fan, and the system adopts frequency conversion control to achieve the purpose of energy saving and noise reduction.

The laboratory ventilation system is one of the large-scale and widely influential systems in the entire laboratory design and construction process. Whether the ventilation system is perfect or not directly has an important impact on the laboratory environment, the physical health of the experimental personnel, and the operation and maintenance of the experimental equipment.

Problems such as excessive negative pressure in the laboratory, gas leakage from the fume hood, and laboratory noise have always been problems that plague laboratory workers. These problems cause serious physical and psychological harm to personnel who have been working in the laboratory for a long time, and even the management and logistics personnel who work around the laboratory.

A scientific and reasonable ventilation system requires good ventilation, low noise, easy operation, energy saving, and even requires indoor pressure difference and temperature and humidity to maintain the comfort of the human body.