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一、现有网孔选择程序及其局限性目前国内外在通风网路电算程序中常用的网孔选择方法,是根据图论的“树”的理论来进行的。风道看作是各种线段表示的分支。各分支相互连接点称为节点。从某一节点沿着一些不同的分支又回到该节点的闭合路径称为网孔。一个包含网路所有节点但不形成网孔的相互连通的图称为树。风道阻力最小各分支构成的树称为最小树。树上的分支称为树支,其余
I. Existing Mesh Selection Procedures and Their Limitations The mesh selection methods commonly used in ventilation network calculus at home and abroad are based on the theory of graph theory. Duct as a variety of lines that branch. Each branch connects to each other as nodes. The closed path back to the node from some node along some different branch is called a mesh. A network that contains all the nodes but does not form a network of interconnected figure called the tree. The minimum resistance of the air duct branches formed by the tree called the smallest tree. The branches on the tree are called tree branches and the rest