通風管道設計阻力平衡
Design resistance balance of ventilation duct
一、在通風系統中的通風管道是相互連接的一個整體，必然得遵循各支路阻力平衡規律，當風管系統的結構形式、管道尺寸一經確定，在一定的風機作用下，各段的風量是按阻力平衡規律自動分配的。在設計計算時未經阻力平衡計算，會導致系統實際風量分配與設計不符。當然我們也可以通過調節風閥來分配風量，但這樣一來就又使非不利環路的風壓多余。所以在設計計算時考慮各環路的阻力平衡具有現實意義。
1、 The ventilation duct in the ventilation system is an interconnected whole, which must follow the resistance balance law of each branch. Once the structural form and pipe size of the air duct system are determined, under the action of a certain fan, the air volume of each section is automatically distributed according to the resistance balance law. If the resistance balance calculation is not carried out in the design calculation, the actual air volume distribution of the system will be inconsistent with the design. Of course, we can also adjust the air valve to distribute the air volume, but in this way, the air pressure of the non adverse loop is redundant. Therefore, it is of practical significance to consider the resistance balance of each loop in the design and calculation.
然而，不少設計人員在進行風道水力計算及阻力平衡過程中僅僅憑經驗估算或查圖手算，這樣費時費力還達不到理想效果。筆者所設計的計算軟件以excel為工作平臺，用vba語言為開發工具，從而確保了程序的執行效率。
However, in the process of hydraulic calculation and resistance balance of air duct, many designers only rely on empirical estimation or manual calculation by looking up drawings, which is time-consuming and laborious and can not achieve the ideal effect. The calculation software designed by the author takes excel as the working platform and VBA as the development tool, so as to ensure the execution efficiency of the program.
二、阻力自動平衡計算的基本步驟
2、 Basic steps of resistance automatic balance calculation
風道系統阻力平衡自動計算的執行過程基本延用常規設計的計算步驟，主要如下：
The execution process of automatic calculation of resistance balance of air duct system basically follows the calculation steps of conventional design, mainly as follows:
①將各節點間的邏輯關系、管段的相關參數依次輸入并保存，然后根據技術要求初步選定各管段的假定風速;
① Input and save the logical relationship between nodes and relevant parameters of pipe sections in turn, and then preliminarily select the assumed wind speed of each pipe section according to the technical requirements;
②根據假定風速自動計算管段當量水力直徑及阻力損失;
② Automatically calculate the equivalent hydraulic diameter and resistance loss of the pipe section according to the assumed wind speed;
③用節點逆尋法自動查找系統各環路的路徑及阻力損失，并確定系統不利環路;
③ The node reverse search method is used to automatically find the path and resistance loss of each loop of the system, and determine the unfavorable loop of the system;
④對非不利環路進行自動阻力平衡。
④ Automatic resistance balancing for non adverse loops.
⑤對計算結果進行校核。
⑤ Check the calculation results.
以上過程中只有工作量不大①、⑤需人工干預，而其他步驟全部由計算機自動完成。從而不但確保其計算速度及準確性，而且還可根據需要進行適當的手工調整。
In the above process, only the workload is small, ① and ⑤ need manual intervention, while other steps are completed automatically by the computer. Thus, it can not only ensure the calculation speed and accuracy, but also make appropriate manual adjustment according to the needs.
The above is the detailed introduction of Jinan ventilation duct. I hope it will be helpful to you If you have any questions, please contact us We will provide you with professional service http://www.euio.com.cn
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