Laboratory ventilation system

ventilation system

Lab ventilation is an indispensable part of laboratory design. The main purpose is to provide a safe and comfortable working environment and reduce the possibility of personnel being exposed to dangerous air. There are two ventilation methods in the laboratory, local ventilation and whole room ventilation. Local ventilation is when harmful substances are produced...

Text label: laboratory ventilation system, pharma machinery design, installation and construction

Lab Ventilation System

Lab ventilation is an indispensable part of laboratory design. The main purpose is to provide a safe and comfortable working environment and reduce the possibility of personnel being exposed to dangerous air. There are two kinds of ventilation methods in the laboratory, local ventilation and whole room ventilation. Local ventilation is to discharge the harmful substances immediately after the production. This method saves energy and has good effect. It is a feasible and economical method to improve laboratory conditions. It is the best way to adapt to the ventilation construction of the new laboratory. For some experiments, local ventilation cannot be used, or when the local ventilation cannot meet the ventilation requirements, the whole room ventilation is used. ventilation systems are generally composed of ventilation equipment, ventilation ducts, fans, etc.; commonly used ventilation equipment includes fume hoods, biological safety cabinets, atomic absorption hoods, universal exhaust hoods, stainless steel exhaust hoods, exhaust reagent cabinets and other laboratory Ventilation equipment, etc. For ordinary buildings, if the gas discharged from the room is not corrosive, the ventilation ducts can generally be made of galvanized steel plates. For laboratories that generate corrosive gases, the ducts should be PVC ducts or FRP ducts made of corrosion-resistant materials.

Lab ventilation system fans are mainly used for ventilation and ventilation of laboratory fume hoods and other aspects, mainly including axial fans and centrifugal fans. Short ventilation systems, such as ventilation systems directly discharged to the window or outside the wall; centrifugal fans are suitable for ventilation systems with long pipelines, such as exhaust to the roof through air duct wells or external wall pipes. On the premise that the layout of the laboratory building is reasonable, the positions of air supply, return and exhaust should be fully considered; the balance of air supply, return and exhaust should ensure a reasonable pressure gradient between rooms; a reasonable pressure difference, Ensure the orderly flow of air and prevent cross-contamination; in the design of the laboratory, not only the flow direction of the air flow, but also the size of the air volume, the form of the return air end and the influence of the air supply speed on the indoor air flow and other factors must be considered. Fully consider the routes of personnel and logistics, minimize indoor backflow and eddy current, and avoid the spread of pollution to the room. Special attention should be paid to the impact of local exhaust equipment such as fume hoods on indoor airflow organization.

According to the actual situation such as the type, characteristics and process of testing work in the laboratory, the production and escape of harmful particles or aerosols generated during the experiment are strictly controlled in the laboratory, so as to ensure the safety of operators; Control the pressure of the room to realize the positive or negative pressure of the room and the pressure gradient of different rooms, form a reasonable air flow organization, avoid the gas diffusion from the polluted area to the non-polluted area, and realize the protection of the operator and the guarantee of the experimental environment; Ventilation is used to dilute or replace indoor air. According to the functional characteristics of the laboratory, determine the reasonable number of air changes; on the premise of ensuring the safety and comfort of the pharma machinery, try to reduce the daily maintenance costs and costs. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for laboratories and sterile workshops.

Exhaust air control requirements for pharma machinery fume hoods: The fume hood should maintain a constant and safe surface wind speed when the adjustment door is static or adjusted; when the adjustment door is adjusted, the time for the exhaust air volume to be adjusted in place is less than 1S to ensure No harmful gas escapes during this process; there must be a monitoring function to inform the operator of the current state of the fume hood and the size of the surface wind speed; an energy-saving control scheme should be applied to achieve energy saving; the air volume control valve requires anti-corrosion. Negative pressure control mainly includes differential pressure control and residual air volume control. The room that needs negative pressure control: the room with variable air volume, which has a fume hood, and the exhaust air volume changes in real time; the room with constant exhaust air volume has local exhaust equipment in the room, and the exhaust air volume is constant; A room with no exhaust air, the room has no local exhaust equipment or the air volume does not change during work. In a room with variable air volume, the exhaust air volume changes in real time, and a constant air volume valve cannot be used. Negative pressure control can be realized by differential pressure control or residual air volume control. For a room with constant exhaust air volume, the exhaust air volume of this room is unchanged. From the perspective of cost saving, a constant air volume valve can be used. If energy saving is required, a double-position constant air volume valve can be used. The valve is in a high state during normal operation. The duty mode valve is in a low state, and the air volume in the low state is a safe air volume that meets the minimum air changes and the minimum exhaust air volume of local exhaust equipment.

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