Ventilation duct Classification of Ventilation engineering construction

Ventilation ducts keep the air flowing, so that people can breathe fresh air, which is also for the sake of people's bodies. Ventilation ducts are widely used in buildings, making indoor air more unblocked.

The ventilation ducts are classified by material: steel plate air duct (ordinary steel plate), galvanized sheet (white iron) air duct, stainless steel air duct, glass fiber reinforced plastic air duct, plastic air duct, composite material air duct, color steel sandwich insulation board air duct, double-sided aluminum foil insulation air duct, single-sided color steel insulation air duct, adhesive coated air duct (such as mine air duct), mine plastic air duct, etc;

Ventilation engineering construction

Classification by use:

Generally, there are: purification system supply and return air ducts, central air conditioning ventilation ducts, industrial supply and exhaust air ducts, environmental protection system suction and exhaust air ducts, mining gas drainage pipes, mining adhesive coated air ducts, etc;

Sort by shape:

Generally: circular, rectangular, spiral, etc;

Classification by processing technology:

Generally, it can be divided into Angle iron flange Air duct, Common plate flange Duct.

Indoor and outdoor ventilation

Natural ventilation under wind pressure

When the wind blows towards the building, it will generate positive pressure on the windward side of the building due to the obstruction of the building. At the same time, the airflow bypasses each side and back of the building, which will generate negative pressure at corresponding positions. Wind pressure ventilation is to use the pressure difference between the windward side and leeward side of the building to achieve air circulation.

Climatic factors affecting wind pressure ventilation include air temperature, relative humidity, and air velocity. The area of the air inlet and outlet of the building, the position of the opening, and the angle between the wind direction and the opening affect the wind pressure ventilation effect.

Natural ventilation under construction heat pressure of ventilation engineering

Hot pressure is caused by the temperature difference between indoor and outdoor air. Due to the existence of temperature difference, the density difference between indoor and outdoor is generated, and the pressure gradient appears along the vertical direction of the building wall. If the indoor temperature is higher than the outdoor temperature, the upper part of the building will have higher pressure, while the lower part will have lower pressure. When there are orifices at these locations, air enters through the lower opening and exits from the upper part. If the indoor temperature is lower than the outdoor temperature, the airflow direction is opposite. That is, the air density and the height difference between the inlet and outlet caused by the temperature difference between indoor and outdoor air Ventilation pipe construction 。

Natural ventilation under the combined action of wind pressure and heat pressure

Natural ventilation in actual buildings is the result of the combined action of wind pressure and heat pressure. The two actions sometimes reinforce each other and sometimes offset each other. Because wind pressure is affected by weather, outdoor wind direction, building shape, surrounding environment and other factors, when wind pressure and heat pressure act together, it is not a simple linear relationship.

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