，風管應盡可能按直線布置。
First of all, the wind pipe should be arranged in line as far as possible.
這一條要求對任何風管系統(tǒng)的布置都是重要的準則。直線布置的風管系統(tǒng)，在運行能耗和初投資兩方面都是低的。從的觀點分析，空氣總是"希望"走直線，這將減少能耗。從費用的觀點分析，直管段的費用比各種彎頭等管件要少很多。所以，當布置一個風管系統(tǒng)的平面走向時，應力圖將拐彎的數(shù)員減少。
This requirement is the most important criterion for any duct system layout. The linear layout of the duct system is the lowest in terms of operation energy consumption and initial investment in two aspects. From the point of view of energy conservation, air always "wants" to take a straight line, which will reduce energy consumption. From the point of view of cost, the cost of straight section is much less than that of fittings such as various elbows. Therefore, when the plane direction of an air duct system is arranged, the number of turns should be minimized.
其次，采用標準長度的直線管段，將各種變徑管和接頭的數(shù)量減少。直的、標準長度的風管造價相對便宜，因為它們的加工費低，標準長度的直風管，可按標準寬度的鋼板卷材在白動生產(chǎn)線上制作。而任何段非標準長度的矩形風管，從技術上說，都可當作配件，因為它們不可能用標準卷材做成。螺旋圓形風管實際上可做成任意長度。橢圓形風管的標準長度則完全取決于金屬加工廠的加工標準。有的設計者總是認為，在一個風管系統(tǒng)平面設計中，頻繁地減小風管斷面尺寸，似乎就可以減少一次投資。其實不然。
Secondly, the standard length straight pipe section is used to minimize the number of various diameter pipes and joints. Straight, standard length wind pipes are relatively cheap because their processing costs are low and the standard length of the straight wind pipe can be made on the white moving production line according to the standard width of the steel sheet. Any section of the non standard length rectangular duct can be used technically as an accessory, because they can not be made of standard coil material. The spiral air duct can actually be made at any length. The standard length of the elliptical duct depends entirely on the processing standard of the metalworking plant. Some designers always think that in a plane design of windpipe system, reducing the size of the duct section frequently seems to reduce one investment. In fact, it is not.
第三，只要安裝空間范圍允許，就建議采用螺旋圓風管。
Third, as long as the installation space scope is allowed, we recommend the use of spiral air duct.
圓形風管允許采用較高的風速。仁義通風介紹一個中型變風量空調(diào)系統(tǒng)，其風速可達20m/s，而一個大型變風量寧調(diào)系統(tǒng)，其風速則可高達30m/S。對矩形風管的允許風速則一般都較低，風速過高容易引起扁平風管壁的共振而產(chǎn)生噪聲，特別是會產(chǎn)生低頻噪聲并傳室內(nèi)。
The circular wind pipe allows for higher wind speed. Ren Yi ventilation introduces a medium VAV air conditioning system with a wind speed of 20m/s. A large VAV system can be as high as 30m/S. The allowable wind speed for the rectangular duct is generally low, and the high wind speed can easily cause the resonance of the flat wind tube wall to produce noise, especially the low frequency noise will be produced and spread to the room.
采用圓形風管和較高的送風速度，將可顯著地節(jié)省投資。，與類似的矩形風管系統(tǒng)相比，圓形風管系統(tǒng)將可節(jié)省15%一30%的薄鋼板。例如，同樣輸送17000m3/h的空氣，根據(jù)控制噪聲的要求，圓形風管的風速可取19m/s，矩形風管則取10m/s，它們的鋼板消耗量比較可見表5-1。從表中可知，采用圓形風管，可節(jié)約37％的薄鋼板。
The use of a circular duct and a higher air supply speed will significantly save investment. First, compared with a similar rectangular duct system, the round air duct system will save 15% or 30% of the thin steel plate. For example, the same air for transporting 17000m3/h, according to the requirement of controlling noise, the wind speed of the circular pipe is 19m/s, and the rectangle wind pipe is 10m/s, and the consumption of the steel plate is compared to the visible Table 5-1. From the table, we can see that using round air pipe can save 37% of thin steel plate.
后，圓形風管的安裝費用低于矩形風管。這是因為，圓形風管本身結構的剛性好，預制管段可以較長，現(xiàn)場安裝的工作量相對較少。圓形風管的制作、連接都較矩形風管嚴密，漏風率大約為1%，而矩形風管的漏風率有時高達l0%，甚更高，為防止空氣滲漏，需要花去大量人力對每一矩形風管進行檢漏和密封。
Finally, the installation cost of the circular duct is lower than that of the rectangular duct. This is because the rigid structure of the circular duct itself is good, the precast pipe section can be longer, and the workload of on-site installation is relatively small. The circular wind pipe is made and connected more closely than the rectangular wind pipe, the air leakage rate is about 1%, and the leakage rate of the rectangular duct is sometimes as high as l0%, even higher. In order to prevent air leakage, it is necessary to spend a lot of manpower to leak and seal each rectangular duct.
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