Calculation formula of air flow in ventilation duct

The calculation formula of ventilation duct air volume: T = R*S*3600 T, in cubic meters per hour, where r is the cross-sectional area of air duct.

S is the air velocity in the pipeline, in meters per second.

Ventilation duct classification:

1. air duct for air conditioning system: galvanized sheet and stainless steel; (It is forbidden to use glass fiber reinforced plastics and composite materials that may cause dust pollution)

2. Air duct of central air conditioning system: galvanized sheet and color steel insulation board; (Ventilation pipes can be made of FRP and composite materials)

3. Air duct of environmental control system: galvanized sheet and stainless steel; (Plastic, FRP and composite materials can be used)

4. Air ducts for industrial ventilation systems: steel plates and galvanized plates; (Ladbrokes ventilation duct. Plastic, FRP and composite materials can be used)

Note: FRP air ducts are divided into organic and inorganic types. According to the design specification, the use of organic materials for fire prevention is prohibited.

5. Air ducts for special use occasions: mine coated air ducts and mine plastic ventilation air ducts; (Mine safety features requiring flame retardancy and antistatic property)

Extended data:

Application of ventilation pipeline

Air ducts are mainly used in industrial and construction projects, and their application fields mainly involve: cleaning systems in clean workshops of electronic industry, cleaning systems in sterile workshops of medicines and foods, and central air conditioning systems in hotels, shopping malls, hospitals, factories and office buildings.

Exhaust pipes for dust removal, smoke extraction and oil absorption in industrial pollution control, air supply pipes for industrial environment or comfortable post, gas drainage system for coal mine gas drainage, return air system for coal mine environmental control, etc. PS: It is often developed into a special escape and stealth route in movies and comics.

Ventilation pipeline construction

1) For complex civil buildings, at the design stage, each type of work (HVAC, water supply and drainage, power supply and lighting and construction) should first negotiate the space separation and determine the elevation range of each pipeline. In general, you should not go beyond the limits set for yourself. When individual pipe sections cross the boundary, they should be consulted with other ventilation pipeline projects.

2) The principle to solve the collision and coordination of various ventilation pipes is generally: "Let small pipes make large pipes, so that there is pressure but not pressure". For example, if a water pipe collides with an air duct, the water pipe should rotate. If the hot and cold water pipes collide with the sewer pipes, the hot and cold water pipes should be replaced.

3) Before the construction, the equipment manager engineer should draw the pipelines and single lines of each type of work on the floor plan. Use a colored pen for each pipeline. Synthesize the elevation of each intersection to see if there is any contradiction, find it in time, solve the problem and then install it.

4) In order to reduce investment, save space and reduce the floor height, some pipes without slope requirements can be laid through beams (such as water pipes and fire sprinkler pipes). ).

Baidu encyclopedia-ventilation pipeline