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一、问题的提出通风机在系统中运行的实际风压和风量与通风机铭牌参数值是不同的。铭牌参数是通风机效率最佳工况参数,实际工作参数则是由通风机性能曲线和管道系统阻力曲线的交点(即工作点)位置所确定的。工作点一般用图解方法寻求。用图解法寻求风机的实际工作点是比较麻烦的。但如果所选用风机的铭牌参数p和Q(图1中α点)和系统的设计参数p_0和Q_0(图1中b点)比较接近的话,则可认为工作点c与α和b点均相差
First, the problem of the proposed ventilation fan in the system to operate the actual wind pressure and air volume and fan nameplate parameter values are different. The nameplate parameter is the best working condition parameter of the fan’s efficiency, and the actual working parameter is determined by the intersection of the fan performance curve and the resistance curve of the pipe system (ie the working point). Work points are generally sought graphically. Finding the actual operating point of the fan graphically is cumbersome. However, if the nameplate parameters p and Q of the selected fan (point α in Figure 1) and the system design parameters p_0 and Q_0 (point b in Figure 1) are relatively close to each other, it can be considered that the operating point c is different from the α and b points.