1.通风管道阻力计算版计算方法：
1. The official calculation method of ventilation duct resistance:
通风管道阻力计算版根据陆耀庆编《使用供暖空调设计手册》提供的方法计算。
The latest version of ventilation duct resistance calculation is based on the method provided in the Design Manual for Use of Heating and Air Conditioning compiled by Lu Yaoqing.
2.数据输入：
2. Data input:
风管尺寸：输入圆管直径和矩形管的边长。
Duct Size: Enter the diameter of the circular pipe and the side length of the rectangular pipe.
风量：风管内的风量。
Air volume: the air volume in the air duct.
风管长度：如果给出风管长度，它
Duct Length: If a duct length is given, it
将计算该管段的总阻力。
The total resistance of the segment is calculated.
3.结果输出：
3. Result output:
数据输入完成后，按“计算”按扭，在结果输出栏将给出计算结果。
After data input, press the "Calculate" button, and the calculation result will be given in the result output column.
风管内空气流动的阻力有两种，一种是由于空气本身的粘滞性及其与管壁间的摩擦而产生的沿程能量损失，称为摩擦阻力或沿程阻力;另一种是空气流经风管中的管件及设备时，由于流速的大小和方向变化以及产生涡流造成比较集中的能量损失，称为局部阻力。
There are two kinds of air flow resistance in the air duct. One is the energy loss along the way due to the viscosity of the air itself and the friction between the air and the pipe wall, which is called friction resistance or along the way resistance; The other is that when the air flows through the pipe fittings and equipment in the air duct, the relatively concentrated energy loss caused by the change in the size and direction of the flow velocity and eddy current is called local resistance.
通风管道摩擦阻力计算及原理：
Calculation and principle of friction resistance of ventilation pipe:
根据流体力学原理，空气在横断面形状不变的管道内流动时的摩擦阻力按下式计算：
According to the principle of fluid mechanics, the friction resistance of air flowing in the pipe with constant cross section shape is calculated as follows:
ΔPm=λν2ρl/8Rs
Δ Pm= λν two ρ l/8Rs
对于圆形风管，摩擦阻力计算公式可改写为：
For circular air duct, the friction resistance calculation formula can be rewritten as follows:
ΔPm=λν2ρl/2D
Δ Pm= λν two ρ l/2D
圆形风管单位长度的摩擦阻力(比摩阻)为：
The friction resistance (specific friction) per unit length of circular air duct is:
Rs=λν2ρ/2D
Rs= λν two ρ/ 2D
以上各式中
Among the above
λ————摩擦阻力系数
λ———— Friction resistance coefficient
ν————风管内空气的平均流速，m/s;
ν———— Average velocity of air in air duct, m/s;
ρ————空气的密度，Kg/m3;
ρ———— Air density, Kg/m3;
l ————风管长度，m
L -- length of air duct, m
Rs————风管的水力半径，m; Rs=f/P
Rs -- hydraulic radius of air duct, m; Rs=f/P
f————管道中充满流体部分的横断面积，m2;
F -- cross-sectional area of fluid filled part in the pipeline, m2;
P————湿周，在通风、空调系统中既为风管的周长，m;
P -- wet perimeter, which is the perimeter of air duct in ventilation and air conditioning systems, m;
D————圆形风管直径，m。
D -- diameter of circular air duct, m.
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