三种风管的性能比较

Performance comparison of three kinds of air ducts

(1)消声性能

(1) noise elimination performance

镀锌铁皮风管：无消声性能，必须加装消声器，且需要更大的空间(因消声器的外形尺寸比风管尺寸每边大出200mm),且消声器要达到应有的效果，其设置位置有一定的要求，实际工程中很难做到,造成实际消声效果也难以保证。而且在风速较高、单边长度较大又加强不够、或与高中频风机配套时还会产生二次噪声,使得消声措施事倍功半。

Galvanized iron sheet air duct: no muffling performance, must be installed muffler, and need more space (because the size of the muffler is 200 mm larger than the size of each side of the duct), and muffler to achieve the desired effect, its location has certain requirements, it is difficult to achieve in actual engineering, resulting in actual muffling effect is difficult to ensure. And when the wind speed is higher, the length of one side is larger and strengthened insufficiently, or when it is matched with the high-frequency fan, the secondary noise will be generated, which makes the muffling measures work twice as well.

无机玻璃钢风管：无消声性能，隔声性能优于铁皮风管，必须加装消声器，同铁皮风管一样，既多占用空间，噪声处理的效果也不理想。

Inorganic FRP air duct: no muffling performance, sound insulation performance is better than iron sheet air duct, must be installed muffler, like iron sheet air duct, both occupy more space, noise treatment effect is not ideal.

复合玻纤板风管：其管壁是一种多孔性吸声材料,对中、高频声波具有良好的吸声效果,有数据表明,中频在1000Hz～2000Hz,管径500×320情况下,其消声量可达到18～21dB/m,是一个很好的管式消声器,可以消除来自空调设备的一次噪声及阀体、管件等处产生的二次噪声,随着管道的延长,效果更为明显,故可省去专用消声器。

Composite fiberglass air duct: The tube wall is a porous sound absorbing material with good sound absorbing effect for medium and high frequency sound waves. The data show that the muffler can reach 18-21 dB/m when the medium frequency is between 1000Hz and 2000 Hz and the pipe diameter is 500 x 320. It is a good tube muffler and can eliminate the primary noise from air conditioning equipment and valve body. With the extension of the pipe, the effect of the secondary noise generated by the pipe fittings is more obvious, so the special muffler can be omitted.

(2)保温性能

(2) thermal insulation performance

镀锌铁皮风管：导热系数很大(为60.4W/m.K),无保温性能,必须另外加包保温层及保温防护层,在风管法兰处保温厚度不易保证或无保温，将产生冷桥现象，风管壁面保温层的覆盖均匀度有时也会因安装净空不足够而不易保证。

Galvanized iron sheet air duct: the thermal conductivity is very large (60.4W/m.K), no insulation performance, must be added additional insulation layer and insulation protective layer, in the air duct flange insulation thickness is not easy to ensure or no insulation, will produce cold bridge phenomenon, air duct wall insulation layer coverage uniformity is sometimes not easy to ensure due to insufficient installation clearance.

无机玻璃钢风管：导热系数大(为0.5W/m.K)，无保温性能，必须另外加包保温层及保温防护层，保温层特性同铁皮风管。

Inorganic FRP air duct: high thermal conductivity (0.5W/m.K), no heat preservation performance, must be packed with additional insulation layer and heat preservation protective layer, insulation layer characteristics with iron sheet air duct.

复合玻纤板风管：管壁为离心玻璃纤维板，导热系数小(平均温度24℃时是0.029W/m.K,70℃时是0.04W/m.K),特别是外表复合铝箔布具有很高的热反射能力，且其强度和韧性均大大超过铝箔纸，不易破损。因其风管壁即为保温层,管道采用榫接、T形内框架对接和铁皮插接(或外法兰连接)，使整个风管各部位保温均匀,无冷桥现象产生，具有良好的保温绝热性能。

Composite fiberglass duct: The wall of the duct is centrifugal fiberglass sheet, and the thermal conductivity is small (the average temperature is 0.029W/m.K at 24 C and 0.04W/m.K at 70 C). Especially the exterior composite aluminum foil has high heat reflectivity, and its strength and toughness are much higher than that of aluminum foil paper, so it is not easy to be damaged. Because the air duct wall is insulation layer, the pipe adopts tenon connection, T-shaped internal frame butt connection and iron sheet insertion (or external flange connection), so that the whole air duct insulation uniform, no cold bridge phenomenon, good insulation performance.

(3)防火性能

(3) fire resistance

镀锌铁皮风管：铁皮风管属不燃材料，但其保温材料是否燃烧要依材质而定，通常要选用离心玻璃棉等不燃保温材料,而聚苯乙烯板等则不能满足要求。

Galvanized iron sheet air duct: iron sheet air duct is a non-combustible material, but its insulation material burning depends on the material, usually choose centrifugal glass wool and other non-combustible insulation materials, and polystyrene board can not meet the requirements.

无机玻璃钢风管：无机玻璃钢风管属不燃材料，但其保温材料是否燃烧要依材质而定，通常选用离心玻璃棉等不燃保温材料，而聚苯乙烯板等则不能满足要求。

Inorganic FRP air duct: Inorganic FRP air duct is a non-combustible material, but its insulation material burning depends on the material, usually choose centrifugal glass wool and other non-combustible insulation materials, and polystyrene board can not meet the requirements.

复合玻纤板风管：以不燃性玻璃纤维棉板为基材，采用自制阻燃性粘合剂(获国家专利)，将铝箔布和玻璃丝布分别复合在基材的两侧。因而成品风管属不燃材料，符合GB8624-1997《建筑材料燃烧性能分级方法》A级合格，具有良好的防火性能。

Composite fiberglass duct: Using non-flammable fiberglass cotton board as the base material, using self-made flame retardant adhesive (patented by the state), aluminum foil cloth and fiberglass cloth were respectively composite on both sides of the base material. Therefore, the finished air duct is a non-combustible material, conforming to the GB 8624-1997 "Classification Method for Combustibility of Building Materials" A qualified, with good fire performance.

(4)防潮性能

(4) moisture resistance

镀锌铁皮风管：易受潮、腐蚀生锈，在输送含湿量大的空调用空气时更为严重，尤其风管制作时在铁皮咬口处镀锌层遭到破坏，同时又不易弥补和防腐处理，冷桥产生处也会有凝露对管道的腐蚀，也因此影响了其整体寿命。

Galvanized iron sheet air duct: easy to be damped, corroded and rusted. It is more serious when conveying air for air conditioning with large moisture content. Especially when air duct is operated, the galvanized layer is damaged at the iron sheet bite. At the same time, it is not easy to make up for and prevent corrosion. Condensation at the place where the cold bridge comes into being will corrode the pipeline, thus affecting its overall life.

无机玻璃钢风管：无法与有机玻璃钢风管的防潮性能相比，受原料配比的制约，其防潮能力的稳定性较差。受市场竞争的影响，为降低成本,使目前市场上出现的无机玻璃钢风管绝大多数不能符合相关标准,这更使用户对其具有的“玻璃钢”的相关优点产生怀疑。

Inorganic fiberglass reinforced plastic duct: can not be compared with organic fiberglass reinforced plastic duct moistureproof performance, restricted by the proportion of raw materials, the stability of its moistureproof ability is poor. Affected by the market competition, in order to reduce costs, most of the inorganic FRP air ducts in the market can not meet the relevant standards, which makes users doubt the relevant advantages of FRP.

复合玻纤板风管：无易腐材料和部件,风管外表面为防潮铝箔布,其透湿率为0，具有极强的防锈蚀能力,玻纤板的吸水率不大于2%，管道长期处在潮湿环境中，它的消声和保温等各种性能不会改变，因其为多孔材料,要防止管道内部、管端和切口处被水长期浸泡。

Composite fiberglass duct: no perishable materials and components, the outside surface of the duct is damp-proof aluminum foil cloth, its moisture permeability is 0, has a very strong anti-rust ability, fiberglass board water absorption rate is not more than 2%, long-term in a humid environment, its muffling and thermal insulation and other properties will not change, because it is porous material, to prevent the internal pipeline The pipe ends and incisions are immersed in water for a long time.

(5)漏风量

(5) air leakage

规范规定：风管漏风量应根据管道长短及其气密程度,按系统风量的百分率计算。风管漏风率宜采用10%(对于一般送排风系统)

The Code stipulates that the air leakage of air duct should be calculated according to the length of pipeline and the degree of air tightness, and the percentage of air leakage of the system. The air leakage rate of the duct should be 10% (for general air supply system).

镀锌铁皮风管：风管总长度50m以下时,其漏风率通常要达到8%～10%,风管总长度增加时，漏风量要适当增加,当管内静压为500Pa时,风管单位面积漏风量为6m3/h.m2。

Galvanized iron sheet air duct: when the total length of air duct is less than 50 m, the air leakage rate usually reaches 8%-10%. When the total length of air duct increases, the air leakage rate should be increased appropriately. When the static pressure is 500 Pa, the air leakage per unit area of air duct is 6 m3/h.m2.

无机玻璃钢风管：风管总长度50m以下时,其漏风量通常要达到6%～8%,风管总长度增加时，漏风量要适当增加。

Inorganic FRP duct: When the total length of duct is less than 50m, the air leakage usually reaches 6%-8%. When the total length of duct increases, the air leakage should be increased appropriately.

复合玻纤板风管：风管通过开槽、合榫、胶粘制作连接，结合缝再用铝箔胶带密封，不加固风管漏风量基本为0,加固风管漏风率不大于1%，系统漏风率不大于2%，,当管内静压为500Pa时，风管单位面积漏风量小于1.8m3/h.m2。

Composite fiberglass board air duct: air duct is connected by grooving, tenon closing and gluing, and then sealed by aluminum foil tape. The air leakage of the air duct without reinforcement is basically 0, the air leakage rate of the reinforced air duct is not more than 1%, the air leakage rate of the system is not more than 2%. When the static pressure of the duct is 500 Pa, the air leakage per unit area of the air duct is less than 1.8 m3/h.m2.

(6)强度

(6) strength

镀锌铁皮风管：强度较高，抗静压能力强，在断面尺寸大时必须按规定进行加固(规范规定边长大于或等于630mm和保温风管边长大于或等于800mm，且其管段长度大于1200mm时，均应采取加固措施,对于边长小于或等于800

Galvanized iron sheet air duct: high strength, strong resistance to static pressure, in large section size must be strengthened according to the provisions (specifications specified edge longer than or equal to 630 mm and insulation duct edge longer than or equal to 800 mm, and its pipe length is greater than 1200 mm, should be taken to strengthen measures, for the side length is less than or equal to 800 mm