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1、水利計(jì)算部分計(jì)算風(fēng)管的壓力損失：通過對風(fēng)管的沿程壓力損失和局部壓力損失的計(jì)算，最終確定風(fēng)管的尺寸并選擇新風(fēng)機(jī)組或空調(diào)機(jī)組。（1）通過矩形風(fēng)管的風(fēng)量按下式計(jì)算：L＝3600abv其中a、b為風(fēng)管斷面的凈高和凈寬。（2）沿程壓力損失長度為l的風(fēng)管沿程壓力損失△Pm可按下式計(jì)算：△Pm＝△pm*l其中△pm為單位管長的沿程壓力損失（3）局部壓力損失局部壓力損失△Pj＝ξρν2/2其中ξ為局部阻力系數(shù)，ρ為空氣的密度，ν為風(fēng)管內(nèi)該壓力損失發(fā)生處的空氣流速。（4）風(fēng)管的壓力損失△P＝△pm＋△Pj繪出三層風(fēng)管草圖：第三層的新風(fēng)系統(tǒng)風(fēng)管的尺寸選擇、壓力損失等計(jì)算結(jié)果如下表：管
2、段管長l風(fēng)量風(fēng)管斷面實(shí)際面積單長沿程摩阻沿程阻力實(shí)際速度局部阻力系數(shù)局部阻力動壓總阻力1~22000108120*1200.01440.951.92.0830.4041.0522.6042.9522~37977216160*1200.01921.6513.163.1250.150.8785.85914.0403~42150432160*1600.02562.314.964.6870.172.24113.1837.2074~511200648200*1600.0323.6240.545.6250.4047.66918.98448.2135~653541260320*
3、2000.0642.4813.275.4680.071.25617.94414.5346~743431561320*2000.0642.4810.776.7750.164.40627.54115.1777~848381777400*2000.082.2110.696.1700.153.42622.84214.1188~918281885400*2000.082.214.036.5450.40410.38425.70314.4249~103849216160*1200.01921.656.353.1250.4442.6015.8598.9522~a200010812
4、0*1200.01440.951.92.0830.4041.0522.6042.9523~b2000216160*1200.01921.653.33.1250.42.3435.8595.6434~c2000216160*1200.01921.653.33.1250.311.8165.8595.1165~d2000198160*1200.01921.653.32.8640.4041.9894.9235.2895~e2000414160*1600.02562.314.624.4920.4044.89112.1079.5116~f2000301160*1600.0256
5、1.322.643.2660.31.9206.4004.5607~h2000216160*1200.01921.653.33.1250.331.9335.8595.2338~g2000108120*1200.01440.951.92.0830.250.6512.6042.551總計(jì)59539129.950.514186.740180.478注：此層風(fēng)管系統(tǒng)中最不利環(huán)路為：1－2－3－4－5－6－7－8－9－10選擇最不利環(huán)路進(jìn)行阻力計(jì)算，計(jì)算結(jié)果如下表：管段單長沿程摩阻沿程阻力局部阻力系數(shù)局部阻力動壓管道阻力1~20.951.90.4041.0522.6042.9
6、522~31.6513.160.150.8785.85914.0403~42.314.960.172.24113.1837.2074~53.6240.540.4047.66918.98448.2135~62.4813.270.071.25617.94414.5346~72.4810.770.164.40627.54115.1777~82.2110.690.153.42622.84214.1188~92.214.030.40410.38425.70314.4249~101.656.350.4442.6015.8598.9522~a0.951.90.4041.0522
7、.6042.9523~b1.653.30.42.3435.8595.6434~c1.653.30.311.8165.8595.1165~d1.653.30.4041.9894.9235.2895~e2.314.620.4044.89112.1079.5116~f1.322.640.31.9206.4004.5607~h1.653.30.331.9335.8595.2338~g0.951.90.250.6512.6042.551總計(jì)129.950.514186.740180.478對節(jié)點(diǎn)2，△H1-2＝18.02，△Ha-3-2＝20.05，20.05-18.02/
8、20.05
