1.通風管道阻力計算版計算方法：
1. The official calculation method of ventilation duct resistance:
通風管道阻力計算版根據陸耀慶編《使用供暖空調設計手冊》提供的方法計算。
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.數據輸入：
2. Data input:
風管尺寸：輸入圓管直徑和矩形管的邊長。
Duct Size: Enter the diameter of the circular pipe and the side length of the rectangular pipe.
風量：風管內的風量。
Air volume: the air volume in the air duct.
風管長度：如果給出風管長度，它
Duct Length: If a duct length is given, it
將計算該管段的總阻力。
The total resistance of the segment is calculated.
3.結果輸出：
3. Result output:
數據輸入完成后，按“計算”按扭，在結果輸出欄將給出計算結果。
After data input, press the "Calculate" button, and the calculation result will be given in the result output column.
風管內空氣流動的阻力有兩種，一種是由于空氣本身的粘滯性及其與管壁間的摩擦而產生的沿程能量損失，稱為摩擦阻力或沿程阻力;另一種是空氣流經風管中的管件及設備時，由于流速的大小和方向變化以及產生渦流造成比較集中的能量損失，稱為局部阻力。
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.
通風管道摩擦阻力計算及原理：
Calculation and principle of friction resistance of ventilation pipe:
根據流體力學原理，空氣在橫斷面形狀不變的管道內流動時的摩擦阻力按下式計算：
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
對于圓形風管，摩擦阻力計算公式可改寫為：
For circular air duct, the friction resistance calculation formula can be rewritten as follows:
ΔPm=λν2ρl/2D
Δ Pm= λν two ρ l/2D
圓形風管單位長度的摩擦阻力(比摩阻)為：
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————摩擦阻力系數
λ———— Friction resistance coefficient
ν————風管內空氣的平均流速，m/s;
ν———— Average velocity of air in air duct, m/s;
ρ————空氣的密度，Kg/m3;
ρ———— Air density, Kg/m3;
l ————風管長度，m
L -- length of air duct, m
Rs————風管的水力半徑，m; Rs=f/P
Rs -- hydraulic radius of air duct, m; Rs=f/P
f————管道中充滿流體部分的橫斷面積，m2;
F -- cross-sectional area of fluid filled part in the pipeline, m2;
P————濕周，在通風、空調系統中既為風管的周長，m;
P -- wet perimeter, which is the perimeter of air duct in ventilation and air conditioning systems, m;
D————圓形風管直徑，m。
D -- diameter of circular air duct, m.
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