Design and installation of laboratory exhaust and fresh air systems
The ventilation design requirements of laboratory ventilation and comfort air conditioning systems are different, and the main purpose is to provide a safe and comfortable working environment; the number of air changes in the chemical laboratory is required to be greater than 10 times per hour, the physical laboratory is greater than 8 times per hour, and the laboratory has no air changes. The number of air changes per hour can be...
Text label: pharma machinery design, laboratory planning, exhaust air system design
exhaust and fresh air system design and installation
The ventilation design requirements of laboratory ventilation and comfort air conditioning systems are different, and the main purpose is to provide a safe and comfortable working environment; the number of air changes in the chemical laboratory is required to be greater than 10 times per hour, and the number of air changes in the physics laboratory is greater than 8 times per hour. When there is no one in the laboratory, the number of air changes can be reduced to 6 times; the number of fume hoods should be sufficient, and it should not be used as the only indoor exhaust device, and a local exhaust system is installed above the instrument room. Part of the supplementary air in the laboratory comes from the fresh air directly sent by the air conditioning system. This part of the fresh air changes according to the change of the exhaust air volume of the laboratory. ; Negative pressure is realized by the arrangement of supply and exhaust air volume and air supply and exhaust outlets, and the airflow organization is from office, management room, inner aisle to the experimental room where dangerous substances are generated; the position of the fume hood is far from the air flow and the turbulence is large. The place is far away from the walking area and the fresh air area. The fresh air is introduced from the place far away from the fume hood, and the air flow path is far away from the fume hood.
The fresh air volume of the air-conditioning system should take the maximum value of the following three items according to the design specifications of the computer room: the total indoor air supply volume; ensure that each staff member is 40-60m3/H, so it is necessary to know the maximum number of stations, usually this factor It will not affect the final air volume value; to maintain the indoor positive pressure, usually take twice the experimental volume to configure the fresh air volume, and you need to know the length, width and height of the room. According to the indoor characteristics, determine the form of the new exhaust fan: cabinet type, beautiful, simple installation, intuitive effect, easy to use, simple maintenance, but it is required to be installed near the fresh air collection port, occupying the ground and the equipment price is slightly expensive; ceiling type, hidden installation , does not occupy land area, the equipment price is relatively cheap, the installation position is flexible, but the installation cost is high, the maintenance is more troublesome; the window machine is simple and cheap, the filtration efficiency is low, and it is easy to block. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for laboratories and sterile rooms.
Generally, the fresh air should be sent to the return air outlet of the computer room air conditioner within a distance of 1m. If it is sent directly to the room, the air volume should minimize the resistance. The air outlet is arranged near the door, and people will feel that the positive pressure is large, because people usually feel air leakage through the door seam For positive pressure, the air duct system should not block the return air of the air conditioning system; the regular exhaust air duct should extend under the floor as much as possible to extract the flue gas, because the flue gas has a large proportion and sinks on the ground, the same is true for the indoor air supply and exhaust ports Also as far away as possible. The air duct system of the fresh air fan, from the fresh air outlet to the fresh air outlet, generally has the fresh air inlet, the fresh air electric fire damper, the air duct, the fresh air inlet soft connection, the fresh air fan, the fresh air outlet soft connection, the muffler, the static pressure box, the air duct , The soft connection of the louver tuyere, the fresh air outlet louver tuyere.
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