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Types of central air conditioning ventilation ducts

Types of central air conditioning ventilation ducts

2021-11-15

1. The types of air ducts commonly used in my country

     1) Galvanized sheet steel duct;

    2) Inorganic glass fiber reinforced plastic duct;

    3) Composite glass fiber board air duct.

2. The basic characteristics of the three types of air ducts

    Galvanized sheet steel air duct: one of the earliest used air ducts, made of galvanized sheet steel, suitable for the transportation of general gases with small moisture content, easy to rust, no heat preservation and noise reduction functions, and a long production and installation cycle specialty. Inorganic glass fiber reinforced plastic air duct: a newer type of air duct, made of glass fiber reinforced inorganic materials, non-flammable, corrosion-resistant, heavy weight, high hardness but relatively brittle, and easy to deform and crack under the influence of its own weight, without heat preservation and noise reduction performance , Long production and installation cycle. Composite glass fiber board air duct: the latest type of air duct in recent years, using centrifugal glass fiber board as the base material, inner covered with glass cloth, outer covered with moisture-proof aluminum foil cloth Textured cloth/aluminum foil/kraft paper), dried with a special fireproof adhesive, and then made by cutting, grooving, bonding and reinforcement, etc., using special sealant, pressure-sensitive tape, and heat-sensitive tape to connect and seal, according to The section size and wind pressure of the duct shall be reinforced with appropriate measures. It has the advantages of noise reduction, heat preservation, fire prevention, moisture resistance, small air leakage, light material, easy construction, saving installation space, long service life, and economical application.

3. Comparison of the performance of the three types of air ducts

3.1 Noise reduction performance Galvanized sheet steel duct: No noise reduction performance, a muffler must be installed, and the muffler must achieve its due effect, and its setting position has certain requirements, which is difficult to achieve in actual engineering, resulting in actual The muffling effect is difficult to guarantee. And when the wind speed is high, the unilateral length is large and the reinforcement is not enough, or the secondary noise is generated when it is matched with a high and medium frequency fan. Inorganic glass fiber reinforced plastic duct: no sound attenuation performance, sound insulation performance is better than galvanized sheet steel duct, a muffler must be installed, like galvanized sheet steel duct, it not only takes up more space, and the effect of noise treatment is not ideal. Composite glass fiber board duct: Its wall is a porous sound-absorbing material, which has good sound absorption effect on medium and high-frequency sound waves. It is a good tube muffler that can eliminate primary noise from air conditioning equipment and The secondary noise generated by the valve body, pipe fittings, etc., has a more obvious effect with the extension of the pipeline, and the special muffler can be omitted.

  3.2 Thermal insulation performance Galvanized sheet steel duct: The thermal conductivity is very large (60.4 W/m & #183; K), no thermal insulation performance, additional insulation layer and protective layer must be added. The insulation thickness at the flange of the duct is not easy to guarantee or there is no heat preservation, which will cause the phenomenon of cold bridge, and the coverage uniformity of the insulation layer on the wall of the duct is sometimes difficult to guarantee due to insufficient installation clearance. Inorganic glass fiber reinforced plastic air duct: high thermal conductivity (0.5W/m & #183; K), no heat preservation performance, additional insulation layer and protective layer must be added, and the characteristics of the insulation layer are the same as the galvanized steel sheet air duct. Composite glass fiber board duct: low thermal conductivity (average temperature of 24 ℃ is 0.029W/m & #183; K, 70 ℃ is 0.04W/m & #183; K), especially the appearance of composite aluminum foil cloth has a very high Heat reflection ability. Because the wall of the air duct is the thermal 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 entire air duct are insulated evenly, and there is no cold bridge phenomenon, and it has good performance. Thermal insulation performance.

 


           

           
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