First of all, the wind pipe should be arranged in line as far as possible.
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.
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.
Third, as long as the installation space scope is allowed, we recommend the use of spiral air duct.
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.
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.
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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