，虽然有不少铁皮或者铝皮焊接成的方形通风91在线视频观看，但是圆通风91在线视频观看也用得挺广泛的。故而问题仅部分成立。
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.
关于为什么液体使用圆形91在线视频观看还是比较好理解：圆形91在线视频观看比较容易实现密封、强度高、而且流动阻力系数是所有形状中小的。
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.
原则上通风91在线视频观看好也能设计成圆管，但是一方面通风91在线视频观看漏一点气没什么太大问题，且和流动阻力很小不需要特殊优化；另一方面方形91在线视频观看加工比较方便，相对便宜。而且如果出了问题更换也非常方便，所国内考虑经济因素往往就使用方形铁皮91在线视频观看做通风了。
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.
给排水91在线视频观看一般管径较小，即使用圆管，对建筑的层高影响也不大。还有一点转弯较多，如果做成方形91在线视频观看，会导致转弯处的局部阻力太大，从而增加水泵的扬程，不经济。
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.
通风91在线视频观看一般管径较大，使用圆管占用的空间较大，影响建筑的层高，所以方管用的较多。圆管也有，主要用在层高较高的建筑内。圆形风管也有的，比如涉及到带压的风管超过1公斤压力的都是圆管，主要还是制造成本的问题，卷管比方管焊接要容易。而液体91在线视频观看因为基本上带压的，所以圆管多，但是也不能说没有方管，比如城市下水道就可以理解为方管或者椭圆管。
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.
为什么要用方管?
Why do you want to use a square tube?
就地下车库举例来说，梁高1.4米,4.3-1.4-2=0.9米才是91在线视频观看层,91在线视频观看层里面有电缆桥架,喷淋管,消防栓管,暖气或空调水管,以及通风91在线视频观看。规范要求地下车库一个防烟分区面积不大于2000平米,91影视在线污污污风机风量按照换气次数取6次取,2000*4.3*6=51600的风量,风管内风速不大于20,那么风管的截面积就是0.716平米.如果是圆形91在线视频观看的话,91在线视频观看的直径就是0.955米,看到了么?还不够他自己用的。实际上在设计中,地下车库的通风91在线视频观看占用的高度一般是400mm-500mm之间.我一般像这种项目做的风管尺寸都是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,通风91在线视频观看经常会在剪力墙(钢筋混凝土墙)上开洞,安装风口给前室送风.这种洞的原则是越窄越好,结构给的限制是800mm,另外剪力墙上还有不能打洞的边缘构件,经常给的空间只有四五百宽.像是这种洞的面积一般都是0.8平米,开圆洞根本开不出来的。所以,91黄色软件下载也知道圆形91在线视频观看各种好,但是奈何现实必须要满足相关要求。
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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