What are the performance characteristics of high temperature resistant telescopic air ducts
High temperature resistant telescopic air duct silencing performance
The wall of the high temperature resistant telescopic duct is a kind of porous sound-absorbing material, which has a good sound absorption effect on medium and high frequency sound waves. Data shows that the medium frequency is between 1000-2000HZ and the pipe diameter is 500x320mm. The sound attenuation can reach 18-21dB/m. It is a good tubular muffler, which can eliminate the primary noise from air-conditioning equipment and the secondary noise generated by valve bodies and pipe fittings. With the extension of the pipeline, the effect is more obvious , So the special muffler can be omitted.
High temperature resistant telescopic duct insulation performance
The wall of the high temperature resistant telescopic air duct is made of centrifugal glass fiber board, with low thermal conductivity (0.029W/mK at an average temperature of 24 degrees, 0.04W/m/K at 70 degrees), especially the appearance of composite aluminum foil cloth High heat reflection ability, and its strength and toughness greatly exceed aluminum foil paper, and it is not easy to break. Because the wall of the high temperature resistant telescopic duct is the insulation layer, the pipe adopts tenon joint, T-shaped inner frame butt joint and iron sheet connection (or outer flange connection), so that all parts of the high temperature resistant telescopic duct are evenly insulated and there is no cold bridge. The phenomenon occurs, and it has good thermal insulation performance.
High temperature resistant telescopic duct fireproof performance
High temperature resistant telescopic duct is based on non-combustible glass fiber cotton board, using self-made flame-retardant adhesive (a national patent), the aluminum foil cloth and glass fiber cloth are compounded on both sides of the substrate. Therefore, the finished high-temperature-resistant telescopic air duct is a non-combustible material, which meets the grade A qualification of GB8624-1997 'Classification Method for Combustion Performance of Building Materials' and has good fire resistance.
High temperature resistant telescopic duct, moisture-proof performance
There are no perishable materials and parts in the materials used in the high temperature resistant flexible duct. The outer surface of the high temperature resistant flexible duct is made of moisture-proof aluminum foil cloth. Its moisture permeability is 0. It has strong corrosion resistance. The glass fiber board absorbs water. The rate is not more than 2%. If the pipe is kept in a humid environment for a long time, its muffling and heat preservation properties will not change. Because it is a porous material, it is necessary to prevent the inside of the pipe, pipe ends and cuts from being soaked by water for a long time.
High temperature resistant telescopic duct air leakage
The specification stipulates that the air leakage rate of the high temperature resistant telescopic air pipe should be calculated according to the length of the pipe and its airtightness, as a percentage of the air volume of the system. The air leakage rate of the high temperature resistant telescopic duct should be 10% (for general air supply and exhaust systems). The high temperature resistant telescopic duct is connected by slotting, tenoning, and gluing, and the joint is sealed with aluminum foil tape. The air leakage rate of the high temperature resistant telescopic duct without reinforcement is basically 0, and the air leakage rate of the reinforced high temperature resistant telescopic duct is not more than 1%. , The air leakage rate of the system is not more than 2%. When the static pressure in the pipe is 500Pa, the air leakage per unit area of u200bu200bthe high temperature resistant telescopic air pipe is less than 1.8m3/h.m2.
High temperature resistant telescopic duct strength
The tube wall of the high temperature resistant telescopic duct is made of light glass fiberboard, which is easy to handle and construct, and can meet the pressure requirements of general ventilation and air conditioning. When the wind pressure is 500Pa, the deformation of the pipe wall is not more than 1%; the glass fiber high temperature resistant telescopic wind pipe with a wall thickness of 25mm can withstand a static pressure of 800Pa. When it needs to withstand greater pressure or when the side length of the high-temperature resistant telescopic duct is more than 630mm, it can be reinforced according to the wind pressure and design requirements, and the maximum wind pressure is 1500Pa.
High temperature resistant telescopic duct service life
Composite fiberglass board high temperature resistant telescopic duct is based on glass fiber, light weight, corrosion resistance, anti-aging, easy to disassemble, repair and change the pipeline, the life can be as long as 10-30 years, and it has been abroad Examples of projects that have been used for 30 years, and there are also projects that have been used for more than ten years in China.