，雖然有不少鐵皮或者鋁皮焊接成的方形通風管道，但是圓通風管道也用得挺廣泛的。故而問題僅部分成立。
First of all, although there are a lot of iron or aluminum skin welded in the square of the square pipe, but the round air duct is also widely used. So the problem is only part of the establishment.
關于為什么液體使用圓形管道還是比較好理解：圓形管道比較容易實現密封、強度高、而且流動阻力系數是所有形狀中小的。
It is also well understood why liquid is used for circular pipes: circular pipes are easier to achieve high sealing and high strength, and the flow resistance coefficient is the smallest among all shapes.
原則上通風管道好也能設計成圓管，但是一方面通風管道漏一點氣沒什么太大問題，且和流動阻力很小不需要特殊優化；另一方面方形管道加工比較方便，相對便宜。而且如果出了問題更換也非常方便，所國內考慮經濟因素往往就使用方形鐵皮管道做通風了。
In principle, ventilation pipes can also be designed as circular pipes, but on the one hand, there is not much problem in ventilation pipes, and there is no special need to reduce gas flow resistance. On the other hand, the processing of square pipes is more convenient and cheaper. And if the problem is also very convenient to replace, the domestic consideration of economic factors often use a square iron pipe to do ventilation.
給排水管道一般管徑較小，即使用圓管，對建筑的層高影響也不大。還有一點轉彎較多，如果做成方形管道，會導致轉彎處的局部阻力太大，從而增加水泵的揚程，不經濟。
The general pipe diameter of the water supply and drainage pipes is small, that is, the use of the circular pipe, which has little influence on the floor height of the building. There is also a lot of turning, if a square pipe is made, it will lead to too much local resistance at the turning point, thus increasing the lift of the pump, which is not economical.
通風管道一般管徑較大，使用圓管占用的空間較大，影響建筑的層高，所以方管用的較多。圓管也有，主要用在層高較高的建筑內。圓形風管也有的，比如涉及到帶壓的風管超過1公斤壓力的都是圓管，主要還是制造成本的問題，卷管比方管焊接要容易。而液體管道因為基本上帶壓的，所以圓管多，但是也不能說沒有方管，比如城市下水道就可以理解為方管或者橢圓管。
The general pipe diameter of the ventilation pipe is larger, the space occupied by the pipe is larger, which affects the floor height of the building, so the square pipe is used more. Round pipes are also used mainly in buildings with high levels of height. Circular duct also involves some, such as pressure pipe pressure is more than 1 kilograms of round pipe, mainly manufacturing cost problems, such as easy to pipe pipe welding. Because the liquid pipe is basically pressure, so there are many round tubes, but it can not be said that there is no square tube. For example, the urban sewer can be understood as a square tube or an elliptical tube.
為什么要用方管?
Why do you want to use a square tube?
就地下車庫舉例來說，梁高1.4米,4.3-1.4-2=0.9米才是管道層,管道層里面有電纜橋架,噴淋管,消防栓管,暖氣或空調水管,以及通風管道。規范要求地下車庫一個防煙分區面積不大于2000平米,排煙風機風量按照換氣次數取6次取,2000*4.3*6=51600的風量,風管內風速不大于20,那么風管的截面積就是0.716平米.如果是圓形管道的話,管道的直徑就是0.955米,看到了么?還不夠他自己用的。實際上在設計中,地下車庫的通風管道占用的高度一般是400mm-500mm之間.我一般像這種項目做的風管尺寸都是2000mm*400mm。
For underground garage, for example, the beam height is 1.4 meters, and the 4.3-1.4-2=0.9 meter is the pipe layer. There are cable bridge, spray pipe, fire hydrant pipe, heating or air conditioning water pipe and ventilation pipe in the pipe layer. Specification for the underground garage of a smoke control area of not more than 2000 square meters, air exhaust fan ventilation according to 6 times times, 2000*4.3*6=51600 of air duct in wind speed of not more than 20, then the cross-sectional area of the wind pipe is 0.716 square meters. If it is circular pipe, the pipe diameter is 0.955 meters, see it is not enough for his own use?. In fact, in design, the height of underground garage ventilation pipe is usually between 400mm-500mm. Generally speaking, the size of the wind pipe is 2000mm*400mm.
另一方面,通風管道經常會在剪力墻(鋼筋混凝土墻)上開洞,安裝風口給前室送風.這種洞的原則是越窄越好,結構給的限制是800mm,另外剪力墻上還有不能打洞的邊緣構件,經常給的空間只有四五百寬.像是這種洞的面積一般都是0.8平米,開圓洞根本開不出來的。所以,我們也知道圓形管道各種好,但是奈何現實必須要滿足相關要求。
On the other hand, ventilation pipes often in shear wall (reinforced concrete wall) openings to install anteroom. The wind outlet hole principle as narrow as possible, the structure of professional to limit is 800mm, in addition there are no holes in the shear wall edge member, often to the space of only four hundred or five hundred as wide. The hole in the area are generally 0.8 square meters, a round hole did not come out. Therefore, we also know that the round pipe is good, but the reality must meet the relevant professional requirements.
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