风道风阻计算公式

可算出。三、计算混凝土风道时,替换表格右端的“λ计算”中的公式四、局部阻力系数根据上表和管件数量填入近似值雷诺数阻力系数比摩阻沿程阻力方圆方圆方圆方圆v(m/s)ReReλλΔPm(Pa/m)ΔPm(Pa/m)ΔPm·l(Pa)6.640.003.91E+050.020.0160.000.460.006.320.001.64E+050.020.020.001.140.000.000.000.00E+000.020.020.000.000.000.0031328.640.00E+000.020.0216.110.0016.11局部阻力名称ζ568进风口0.50.20.270.27出风口1曲率半径为1(r=b)的圆管90度弯头0.37≥20曲率半径为1(r=b)的圆管45度弯头0.231矩形管带导流片90度直角弯头0.2Y型三通支通道0.5T型三通支通道0.8三通主通道0.1180(静压箱进口)矩形多叶调节阀全开0.520.30.62-0.880.270.57-0.87大红色计算结果输出0.27鲜绿色已知输入0.57-0.89120180(静压箱进口)0.330.30.630.630.760.750.850.861800.350.660.8180(静压箱出口)0.260.410.410.43管件局部阻力消声器阻力方名称系数名称系数名称系数合计圆方ΔPm·l(Pa)ζζζ∑ζΔPj(Pa)ΔPj(Pa)ΔPj(Pa)9.2600022.840000.000000.000.370.3719.767244040管段阻力环路阻力叠加λ计算(铁皮风道)ΔP(Pa)ΔP(Pa)圆方9.269.26#DIV/0!0.022.8422.84#DIV/0!0.000.000.00#DIV/0!#DIV/0!35.8835.882.47#DIV/0!λ计算(混凝土风道)#DIV/0!#DIV/0!