>> P.245
7-28第7章(8)長方形ダクトの円形ダクトへの換算長辺、短辺をそれぞれa、bとすると、次式で求められる。同一風量で等しい圧力損失をもつ円形ダクトと長方形ダクトの関係は、相当直径De、長方形ダクトの表7-1に長方形ダクトの円形ダクトへの換算を示す。(例)700mm×500mmの長方形ダクトの圧力損失と等しい圧力損失をもつ円形ダクトの直径を求めよ。(解)a=700、b=500De表7-1長方形ダクトの円形ダクトへの換算表短辺長辺1015202530354045505560657075808590951001051101151201251015202510.913.315.216.916.418.921.021.924.427.3303540455018.319.520.721.722.722.924.526.027.428.726.628.630.532.133.729.932.234.336.338.132.835.437.840.042.038.340.943.345.643.746.448.849.251.854.7556065707523.624.525.326.126.829.931.032.133.134.135.136.637.839.140.239.841.442.944.345.743.945.747.449.050.647.749.651.553.355.051.153.355.357.359.254.356.758.961.063.057.359.862.264.466.660.162.865.367.769.765.668.370.873.271.173.776.376.579.282.08085909510027.535.035.936.737.538.441.442.443.544.545.447.048.249.450.651.752.053.454.856.157.456.758.259.761.162.660.962.664.265.967.464.966.668.670.371.968.770.672.674.476.272.274.376.378.380.275.577.879.982.084.078.781.183.385.587.681.884.286.688.991.184.787.289.792.194.487.590.192.795.297.692.995.698.2100.798.4101.1103.7103.9106.5109.310511011512012539.139.940.641.346.447.348.149.049.952.853.854.855.856.858.659.860.962.063.164.065.266.567.768.968.970.371.773.174.473.575.176.678.079.577.879.681.282.784.382.083.885.587.288.885.987.889.691.493.189.791.693.695.497.393.295.397.399.3101.296.798.8100.9103.0105.0100.0102.2104.4106.6108.6103.1105.5107.8110.0112.2106.2108.6111.0113.3115.6109.1111.7114.1116.5118.8112.0114.6117.2119.6122.0114.8117.5120.1122.6125.1120.3122.9125.6128.1125.7128.4131.0131.2133.9136.713013514014515050.651.452.252.953.657.758.659.560.461.264.265.266.267.268.170.171.372.473.574.575.776.978.179.380.580.882.283.584.886.185.787.288.690.091.390.491.993.494.996.394.896.498.099.6101.199.0100.7102.4104.1105.7103.1104.9106.6108..4110.0106.9108.8110.7112.5114.3110.7112.6114.6116.5118.3114.3116.3118.3120.3122.2117.7119.9122.0124.0126.0121.1123.3125.5127.6129.7124.4126.7128.9131.1133.2127.5129.9132.2134.5136.7130.6133.0135.4137.7140.01336.136.1138.5140.9143.3136.5139.1141.6144.0146.4139.3142.0144.6147.1149.515516016517017554.455.155.756.457.162.162.963.764.465.269.170.070.971.872.675.676.677.678.579.581.682.783.884.985.987.388.589.790.891.992.693.965.296.497.697.499.1100.5101.8103.1102.6104.1105.5106.9108.2107.2108.8110.3111.8113.2111.7113.3114.9116.4118.0116.0117.7119.3120.9122.5120.1121.9123.6125.3127.0124.1125.9127.7129.5131.2127.9129.8131.7133.5135.3131.7133.6135.6137.5139.3135.3137.3139.3141.3143.2138.8140.9143.0145.0147.0142.2144.4146.5148.6150.7145.5147.8150.0152.1154.2148.8151.1153.3155.6157.7151.9154.3156.6158.9161.118018519019520057.758.459.059.660.266.066.767.468.168.873.574.375.175.976.780.481.482.283.184.086.987.988.989.990.893.094.195.296.397.398.8100.0101.2102.3103.4104.3105.6106.8108.0109.2109.6110.9112.2113.5114.7114.6116.0117.4118.7120.0119.5120.9122.4123.8125.2124.1125.6127.2128.5130.1128.6130.2131.8133.3134.8132.9134.6136.2137.9139.4137.1138.8140.5142.2143.8141.2143.0144.7146.5148.1145.1147.0148.8150.6152.3148.9150.9152.7154.6156.4152.7154.7156.6158.5160.4156.3158.3160.3162.3164.2159.8161.9164.0166.0168.0163.3165.4167.6169.6171.721022023024025078.379.781.282.685.787.489.090.592.092.794.596.398.099.699.3101.3103.1105.0106.8105.6107.6109.7111.6113.6111.5113.7115.9118.0120.0117.2119.5121.8124.1126.2122.6125.1127.5129.9132.2127.9130.5133.0135.5137.9132.9135.7138.3140.9143.4137.8140.6143.4146.1148.8142.5145.5148.4151.2153.9147.0150.2153.2156.1158.9151.5154.7157.8160.8163.8155.8159.1162.3165.5168.5160.0163.4166.7170.0173.1164.0167.6171.0174.4177.6168.0171.6175.2178.6182.0171.9175.6179.3182.8186.3175.7179.5183.2186.9190.426027028029030093.595.096.4101.2102.8104.3105.8107.3108.5110.2111.9113.5115.1115.4117.3119.0120.8122.5122.0124.0125.9127.8129.5128.3130.4132.4134.4136.3134.4136.6138.7140.8142.8140.2142.5144.7146.9149.0145.9148.3150.6152.9155.5151.3153.8156.2158.6160.9156.6159.2161.7164.2166.6161.7164.4167.0169.6172.1166.7169.5172.2174.8177.5171.5174.4177.2180.0182.7176.2179.2182.1185.0187.7180.8183.9186.9189.8192.7185.2188.4191.5194.5197.5189.6192.9196.1199.2202.2193.9197.2200.5203.7206.8(())0.250.6253.1a+ba・bDe=((700700500))500mm+6443.10.250.625=××=
| < 
| 
> | 
>>
