LABORATORY CLEANROOM SYSTEM AND AIR FLOW

A laboratory cleanroom is a fully enclosed environment. Through the primary, medium and hepa filters of the air conditioning supply and return air system, the indoor ambient air is continuously circulated and filtered to ensure that the airborne particles are controlled to a certain concentration. The main function of laboratory cleanroom is to control the cleanliness, temperature and humidity of the atmosphere that the product (such as silicon chips, etc.) is exposed to, so that the product can be tested and scientifically researched in a good environment. Therefore, a laboratory cleanroom is usually also called an ultra-clean laboratory, etc.

1. Description of laboratory cleanroom system:

Airflow → primary purification → air conditioning → medium purification → fan air supply → duct → hepa box → blow into the room → take away dust, bacteria and other particles → return air column → primary purification... (repeat the above process)

2. Airflow form of laboratory clean room:

① Unidirectional clean area (horizontal and vertical flow);

② Non-unidirectional clean area;

③ Mixed clean area;

④ Ring/isolation device

The mixed flow clean area is proposed by ISO international standards, that is, the existing non-unidirectional flow clean room is equipped with a local unidirectional flow clean bench/laminar flow hood to protect the key parts in a "point" or "line" manner, so as to reduce the area of the unidirectional flow clean area.

3. Main control items of laboratory cleanroom

① Remove dust particles floating in the air;

② Prevent the generation of dust particles;

③ Control temperature and humidity;

④ Regulate air pressure;

⑤ Eliminate harmful gases;

⑥ Ensure the air tightness of structures and compartments;

① Prevent static electricity;

⑧ Prevent electromagnetic interference;

⑨ Safety factors;

⑩ Consider energy saving.

4. DC cleanroom air conditioning system

① The DC system does not use a return air circulation system, that is, a direct delivery and direct exhaust system, which consumes a lot of energy.

② This system is generally suitable for allergenic production processes (such as penicillin packaging process), experimental animal rooms, biosafety cleanrooms, and laboratories that may form cross-contamination production processes.

③ When using this system, the recovery of waste heat should be fully considered.

4. Full-circulation cleanroom air conditioning system

① A full-circulation system is a system without fresh air supply or exhaust.

② This system has no fresh air load and is very energy-saving, but the indoor air quality is poor and the pressure difference is difficult to control.

③ It is generally suitable for cleanroom that are not operated or guarded.

5. Partial circulation cleanroom air conditioning system

① This is the most commonly used system form, that is, a system in which part of the return air participates in the circulation.

② In this system, the fresh air and return air are mixed and processed and sent to the dust-free cleanroom. Part of the return air is used for system circulation, and the other part is exhausted.

③ The pressure difference of this system is easy to control, the indoor quality is good, and the energy consumption is between the direct current system and the full circulation system.

④ It is suitable for production processes that allow the use of return air.