通風管道設計阻力平衡設計計算

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一、在通風系統(tǒng)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(guī)律，當風管系統(tǒng)的結構 形式、管道尺寸一經(jīng)確定，在一定的風機作用下，各段的風量是按阻力平衡規(guī)律自動分配的。在設計計算時未經(jīng)阻力平衡計算，會導致系統(tǒng)實 際風量分配與設計不符。當然我們也可以通過調(diào)節(jié)風閥來分配風量，但這樣一來就又使非不利環(huán)路的風壓多余。所以在設計計算時考慮各環(huán) 路的阻力平衡具有現(xiàn)實意義。

First, in the ventilation system in the ventilation pipe is a whole connected, must follow the branch resistance balance law, when the structure, size of pipe duct system is confirmed, the fan under certain sections of the air is automatically allocated according to the resistance of the law of balance. In the calculation of the design without resistance balance calculation, the system will result in the actual air volume distribution and design. Of course, we can also adjust the air valve to regulate the amount of air, but this will make the most unfavorable loop pressure. So it is of practical significance to consider the resistance balance of each loop in the design calculation.

風道系統(tǒng)阻力平衡自動計算的執(zhí)行過程基本延用常規(guī)設計的計算步驟，主要如下：

Resistance balance duct system automatically calculates the basic implementation process used in conventional design calculation steps are as follows:

①將各節(jié)點間的邏輯關系、管段的相關參數(shù)依次輸入并保存，然后根據(jù)技術要求初步選定各管段的假定風速;

The logical relationship between the nodes and the relevant parameters of the pipe segments are input and stored in turn, and then the initial wind speed of each pipe segment is selected according to the technical requirements;

②根據(jù)假定風速自動計算管段當量水力直徑及阻力損失;

According to the assumed wind speed, the equivalent hydraulic diameter and resistance loss;

③用節(jié)點逆尋法自動查找系統(tǒng)各環(huán)路的路徑及阻力損失，并確定系統(tǒng)不利環(huán)路;

Finding the path and the resistance loss of each loop of the system with the method of node inverse searching, and determining the most disadvantageous loop of the system;

④對非不利環(huán)路進行自動阻力平衡。

Automatic resistance balance for non disadvantageous loop.

⑤對計算結果進行校核。

Check the calculation results.

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