Air duct mainly refers to the ventilation duct of central air-conditioning system, it is often overlooked, but it is an important part of the air-conditioning system, the current common wind duct mainly 4 kinds: 1 galvanized thin steel plate duct; 2 inorganic glass fiber reinforced plastic duct; 3) composite fiberglass board duct; 4. Fiber Fabric wind duct.
1 Galvanized thin steel plate duct: One of the earliest use of the wind pipe, the use of galvanized thin steel plate production, suitable for small moisture content of the general gas transport, there is easy to rust, no insulation and muffler function, the production of long installation cycle characteristics.
2 Inorganic FRP Duct: The new type of duct, the use of glass fiber reinforced inorganic material production, fire, corrosion-resistant, heavy weight, large hardness but more brittle, affected by weight easily deformed crisp, no insulation and noise performance, the production of long installation cycle.
3 composite Glass Fiber board duct: In recent years, the type of duct, centrifugal fiberglass board as the base material, inside the glass cloth, the external compound moistureproof aluminum foil cloth (imports the plate is the internal coating thermal sensitive black acrylic polymer, the outer layer is the thin cloth/aluminum foil/Kraft paper), uses the fire-retardant adhesive compound dry, then through the cutting, the slotting, the bonding reinforcement and so on craft to be made, According to the duct cross-section size, wind pressure size and then use the appropriate reinforcement measures.
4 Fiber fabric Duct: Also often referred to as cloth bag duct, cloth duct, fiber fabric duct, fiber fabric air distribution system, is the latest type of wind pipe, is a special fiber woven into the flexible air distribution system (Ivins fiber fabric duct system), is to replace the traditional supply of air duct, wind valve, scattered flow, A kind of sending out wind end system, such as adiabatic material. It is mainly by the fiber penetration and jet jet of the unique wind mode can even send wind to the end of the system. With a face type out of the wind, large wind volume, no hair-dryer, uniform distribution of air supply, dew-proof, easy cleaning and maintenance, health and environmental protection, beautiful high-grade, colorful, personalized prominent, light weight, roof load can be neglected; the system runs quietly, improves the environment quality, installs the simple, shortens the cycle; The system cost overall savings, cost-effective various advantages.
Performance comparison of two or four kinds of duct
1. Noise attenuation performance;
1 Galvanized thin steel plate duct: No noise-eliminating performance, the vibration of their own will produce sound, must be installed muffler.
2 Inorganic FRP Duct: no noise, sound insulation performance is better than galvanized thin steel plate duct, must be installed muffler.
3 composite Glass Fiber board duct: Its pipe wall is a porous sound absorption material, can save the special muffler.
4 Fiber fabric Duct: Its pipe wall is a flexible fiber fabric, itself is the sound of poor conductor and absorber, it will not produce sound, but also to some extent absorb equipment noise, with the extension of the pipeline, the effect is more obvious, can save the special muffler.
2, Insulation performance:
1 Galvanized thin steel plate duct: The thermal conductivity is very large (for the 4 W? K), no insulation performance, you must add additional insulation and protective layer.
2 inorganic FRP Duct: Large thermal conductivity (for 0.5w/m?) K), no insulation performance.
3 composite Glass Fiber board duct: small thermal conductivity (average temperature 24 ℃ less than 1 w?) K), have certain insulation performance, do not add heat preservation.
4 Fiber fabric Duct: The purpose of air duct insulation is to prevent energy loss and surface condensation of the duct. Fiber fabric wind pipe in the opposite, sacrifice a small amount of cold (less than 10%) to prevent the surface condensation of the duct, (the amount of cold is still into the actual air supply area), the use of fiber fabric itself permeability, on the surface of the air duct to form air conditioning layer, so that there is no temperature The same effect achieved by the use of a large number of insulating materials in common duct.
3. Fire resistance
1 Galvanized thin steel plate duct: not burning, but its insulation layer burning depends on the material.
2 Inorganic FRP Wind pipe: With galvanized thin steel plate duct.
3) composite glass fiber board Duct: The flame-retardant fiberglass cotton sheet as the base material, with a certain fire resistance, but the finished product is also to see the use of the wind pipe binder. (Most of the adhesive fire effect is not ideal)
4 Fiber fabric wind Pipe: Fire characteristics depends on fiber material, general fiber fabric wind pipe is a new type of flame-retardant fiber, to achieve gb8624-2006 B-class fire safety standards.
4, Moistureproof performance
1 Galvanized thin steel plate duct: easy to damp corrosion rust, in the delivery of large moisture content of the air more serious.
2 Inorganic FRP Duct: It is limited by the ratio of raw materials, and its moisture-proof performance is not stable.
3 Composite Fiberglass Board duct: No perishable materials and components, but because it is porous material, to prevent the pipeline inside, pipe end and cut place by water long-term immersion.
4 Fiber fabric Duct: Because of the surface of air conditioning layer, so will not produce condensation, materials are strong hydrophobic materials, not easy to damp. Even if the surface of the duct is stained with water, the surface of the duct can be dried quickly because of infiltration.
5. Compressive strength
1 Galvanized thin steel plate duct: High strength, strong resistance to static pressure, the size of the section must be strengthened in accordance with the provisions.
2 inorganic glass fiber reinforced plastic duct: high strength, but relatively fragile, because of its heavier, difficult to carry, susceptible to collision caused by cracking and breakage.
3) composite glass fiber board duct: can meet the general requirements of ventilation and air-conditioning, the maximum can withstand the wind pressure 1500Pa.
4 Fiber fabric Duct: flexible material, but good toughness. Withstand pressure is greater than 2000Pa.