消防通風管道阻力平衡設計注意事項

發布人：http://www.bnlfans.net   發布時間：2018-06-06 18:25:59

一、關鍵詞的定義

First, the definition of key words

節點的編號規則.為了能根據各節點間的邏輯關系,方便地查尋風道系統的各個環路,我們給各個節點一個數字編號,并對節點編號作如下假定:按風量遞減方向對節點從小到大編號,或都說對于送風系統則節點編號沿氣流方向遞增.

In order to find the various loops of the duct system conveniently according to the logical relationship between the nodes, we numbered each node, and the number of the nodes is assumed as follows: the node number is numbered to the node according to the decreasing direction of the air volume, or the node number of the air supply system increases along the air flow direction.

二、通風管道系統各環路的自動排序

Two, the automatic sorting of each loop of the ventilation pipe system

通風管道系統各環路的自動排序是實現阻力平衡自動計算的前提,也是本程序的關鍵步驟之一.其過程實際上就是按照各環路的阻力損失大小進行自動排序的過程.通過排序可以較好的解決如下兩個問題:①可以根據排序結果直接選取系統的較不利環路;②確實減少各環路阻力平衡時的重復計算.

The automatic sorting of each loop of the ventilation pipe system is the precondition for the automatic calculation of the resistance balance and one of the key steps of the program. The process is in fact the process of sorting automatically according to the resistance loss of each loop. By sorting, the following two problems can be solved well: 1. It can be selected directly according to the ranking results. Take the most adverse loop of the system; second, reduce the repeated calculation of the resistance balance of each loop.

系統各環路的自動排序的具體執行步驟如下:①自動選取末端節點;②依次搜索每一個末端節點對應的環路路徑并同步計算 其阻力損失值;③按阻力損失值從大到小對所有環路進行排列.

The specific implementation steps of the automatic sequencing of each loop are as follows: (1) the terminal node is selected automatically; secondly, the loop path corresponding to each end node is searched in turn and the resistance loss value is calculated synchronously; 3. All loops are arranged according to the resistance loss value from large to small.

三、各環路的阻力平衡

Three, the balance of resistance in each loop

阻力平衡是整個風管設計過程中較煩瑣,也是較關鍵的一步.在此采用按環路阻力值從大到小的順序依次對各環路進行平衡,并對業已進過平衡的管段不再進行調整,可較好的解決平衡過程中的重復計算問題.為了便于計算,我們假設風管支路中需調整的各管段其調整前后阻力值比例保持不變,而調整前后管徑與阻力值之間的關系為:

The resistance balance is the most tedious and the most important step in the design of the whole wind pipe. In this order, the loop is balanced by the order of the drag value of the loop from large to small, and the pipe section which has already entered the balance is no longer adjusted, which can better solve the repeated calculation problem in the balance process. In order to facilitate the calculation, we assume that The ratio of resistance values before and after adjustment in the duct branch is constant, and the relationship between the diameter and resistance value before and after adjustment is:

d=d(p/p)0.225.d:阻力平衡前后風管支路的管徑;p、p:阻力平衡前后較不利環路上對應風管支路的阻力值.

D=d (p/p) 0.225.d: the diameter of the branch of the duct before and after the resistance balance; the resistance value of the corresponding wind pipe branch on the most unfavorable loop before and after P and p: resistance balance.

阻力平衡自動計算時,將環路中已經調整的管段路徑及阻力損失值除去,并對未經調整的支路按式中對各管段計算出經阻力平衡后的管徑d,由d計算出對應的速度v及管段阻力δp.

When the resistance balance is automatically calculated, the adjusted pipe path and the resistance loss value in the loop are removed, and the pipe diameter d after the resistance balance is calculated in the unadjusted branch press, and the corresponding velocity V and the pipe resistance delta P. are calculated by D.

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