水利计算部分

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1、水利计算部分计算风管的压力损失：通过对风管的沿程压力损失和局部压力损失的计算，最终确定风管的尺寸并选择新风机组或空调机组。（1）通过矩形风管的风量按下式计算：L＝3600abv其中a、b为风管断面的净高和净宽。（2）沿程压力损失长度为l的风管沿程压力损失△Pm可按下式计算：△Pm＝△pm*l其中△pm为单位管长的沿程压力损失（3）局部压力损失局部压力损失△Pj＝ξρν2/2其中ξ为局部阻力系数，ρ为空气的密度，ν为风管内该压力损失发生处的空气流速。（4）风管的压力损失△P＝△pm＋△Pj绘出三层风管草图：第三层的新风系统风管的尺寸选择、压力损失等计算结果如下表：管

2、段管长l风量风管断面实际面积单长沿程摩阻沿程阻力实际速度局部阻力系数局部阻力动压总阻力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总计59539129.950.514186.740180.478注：此层风管系统中最不利环路为：1－2－3－4－5－6－7－8－9－10选择最不利环路进行阻力计算，计算结果如下表：管段单长沿程摩阻沿程阻力局部阻力系数局部阻力动压管道阻力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总计129.950.514186.740180.478对节点2，△H1-2＝18.02，△Ha-3-2＝20.05，20.05-18.02/

8、20.05