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4.管路的水力计算4.1绘制管路的系统图1.绘制管路的系统图（1-3）层。并标上管段，管长，以及热负荷大小。2.确定最不利环路，本系统采用异层式系统，取最远的立管为最不利环路。图见附录。4.2计算最不利环路的管径本设计采用重力循环系统.(1)选择最不利环路，并标管径；(2)根据推荐比摩阻确定环路管径，流速，以及平均比摩阻的大小。(3)计算各管段的压力损失Δpy；(4)确定局部阻力损失Δpj；(5)求各管段的压力损失Δp=Δpy+Δpj；(6)求环路的总压力损失ΣΔp；(7)平衡各管段的阻力；(8)将计算结果记入下列的表中。水力计算表管段号QWGKg/hLmdmmVm/sRPa/mΔpy=RLξΔpdΔpjΔp123456789101112立管Ⅰ一层散热器（最不利环路）作用压力Δp=764.41pa11698582200.0452.214.42250.9924.7529.172963833210320.084.9449.4043.8915.5664.9731926466318400.148.81158.585.59.6453.02211.6438528132527700.102.5268.0464.9229.5297.565192646635400.148.8144.053.59.6433.7477.796963833219320.084.9493.8643.8915.56109.429760002063.3250.18.2427.1944.9219.6846.87832521123.3250.0522.759.0841.335.3215.12ΣL=87.6mΣ（Δpy+Δpj）=652.49pa系统作用压力富裕率X=(764.41-652.49)/764.41=14.64%10%入口处的剩余循环作用压力，用阀门截流。立管Ⅰ二层散热器作用压力Δp=1278.88pa963862203.3150.32144.52476.92550.38251.90728.82101435492150.078.9217.84312.1474.7392.57Σ（Δpy+Δpj）=821.39pa不平衡率X=(546.81-821.39)/546.81=-35%-15%(管径最小应调节立管阀门)立管Ⅰ三层散热器作用压力Δp=1793.22pa1136381253.3150.1849.57163.58515.9479.70243.28121914662150.09615.330.6314.53140.56171.16Σ（Δpy+Δpj）(9-12)=1143.26pa不平衡率X=(1119.97-1143.26)/546.81=-2.07%15%立管Ⅱ一层散热器环路资用压力Δp=265.54pa1396293310.5320.0940922.4633.9911.9614.42141042362150.0553.266.52271.4940.1946.711532281113.3200.188.8129.07415.9463.7691.831661272113.3250.118.6228.4545.9523.8152.261796263313.3320.094.9216.2433.9911.9628.2不平衡率X=(265.54-234.42)/265.54=-11.7%-15%立管Ⅱ二层散热器资用压力作用压力Δp=1278.88pa1864162213.3150.33145478.5553.58267.8746619909312150.042.735.46310.792.367.82Σ（Δpy+Δpj）=754.2pa不平衡率X=(654.01-754.2)/654.1=-14%15%立管Ⅱ三层散热器作用压力Δp=1793.22pa2034991203.3150.1745.93151.57514.2271.09222.66211206412150.06501510.3311.7754.965.2Σ（Δpy+Δpj）=287.8pa不平衡率X=(1220.61-287.8)/1220.61=76%-15%(管径最小应调节立管阀门)注：由于系统左右两区对称，故两区水力计算数据相同，不再列出，且系统图也不再标注。局部阻力系数统计表管段号局部阻力个数Σξ1散热器乙字弯截止阀分流三通合流四通22111252弯头直流四通闸阀乙字弯11114315.5直流三通弯头闸阀214弯头闸阀锅炉52165弯头闸阀旁流三通3113.06弯头直流三通2147直流四通括弯1148直流四通括弯1149直流四通括弯11510弯头乙字弯分合流四通截止阀2211131散热器11直流四通括弯11512弯头乙字弯分流四通合流四通截止阀散热器2211113113旁流三通闸阀乙字弯111314乙字弯截止阀散热器分流三通合流四通211112715直流四通括弯11416直流四通括弯11417旁流三通113乙字弯闸阀118直流四通括弯11519弯头乙字弯分合流四通截止阀散热器221113121弯头乙字弯分流四通合流四通221131