Laboratory System Engineering Laboratory Ventilation System

The airflow in the laboratory should flow from the low-risk area to the high-risk area. Generally speaking, the air flow rate of 47 liters/sec (that is, 170 cubic meters/hour) between the above-mentioned areas should be maintained. The office area of the laboratory building should always maintain a positive pressure relative to the corridor and the laboratory.

Normally, room changes of 6-12 times/hour are considered appropriate. When there is a possibility of high thermal load analysis equipment in the laboratory, or a relatively large amount of local exhaust in the room, it may be necessary to increase the ventilation volume accordingly.

The laboratory should adopt a 100% fresh air system, use a central fresh air unit to supply air, and compensate for the laboratory's exhaust air demand. Laboratory exhaust air shall not be recycled and used for other ventilation requirements.

In order to ensure the safety of personnel, the discharge point should be kept at least 3 meters (10 feet) away from the highest point of the roof plane for a period of time, and it may be even more demanding, so that the exhaust gas can be effectively formulated and diluted. The specific selection should be confirmed by calculation.

In a large-scale ventilation system, in order to solve the requirements of variable air volume and constant surface wind speed at the end of the ventilation equipment, further adjustments are realized. We use frequency conversion + variable air volume ventilation control to solve this problem.

Interpretation of Variable Air Volume System

Laboratory airflow control goals

Security (conforms to regulatory requirements)

Local exhaust control

Area pressure control

Reduce energy consumption

Easy to maintain and manage

System flexibility

Comfort control (temperature and humidity)

Fume hood variable air volume control:

As the most important first-level protective equipment in chemical laboratories, fume hoods have strict requirements on the surface wind speed of fume hoods. Generally, the surface wind speed of the fume hood should always be maintained at a constant 0.5m/s. Too high or too low face wind speed will cause leakage risk.

Other local exhaust control:

For local exhaust facilities such as universal exhaust hoods, atomic absorption hoods, reagent cabinets, etc., because of the continuous and efficient control, the gas exhaust is safe and rapid.

Room pressure control:

Normally, it is required to always maintain the negative pressure of the laboratory on the corridor to avoid cross-infection to the surrounding office or production areas.

Reduce energy consumption:

On the premise of fully satisfying safety, greatly reduce operating energy consumption, including air conditioning and fan energy consumption.

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