序号0~11~22~33~44~55~66~77~8流量（L/s)管径（mm）0.20.30.40.420252550缩小值2.52.52.53水泵计算书热水回水泵 HWCP-H1-1,2总压降15.5m沿程水头损失Pa局部阻力系数Pa管段长度流速（m/s）mR(Pa/m)管段损失局部阻力系数ζΣζ损失值0.8320.7551.0060.2311.001.001.001.001399.45657831.143961477.52732.939261399.46831.141477.5932.94弯头1*2阀门0.5直流三通1弯头1直流三通1弯头1*2阀门0.5突然放大1直流三通1阀门0.5直流三通1阀门0.5直流三通1阀门0.5直流三通1阀门0.5*2直流三通1阀门0.5直流三通1阀门0.5弯头1直流三通1阀门0.5弯头1直流三通1阀门0.5弯头1直流三通1阀门0.5弯头1旁流三通3阀门0.5弯头1*2旁流三通3阀门0.5*3弯头1*3突然缩小3止回阀3软接22.5213.5880.99580.31515.8494.820.85030.4613.50119.14132416.991.5162.561.21.622.45050505033330.6920.9221.1531.3833.503.503.503.50268.06798476.56529744.633271072.27191938.241667.982606.223752.951.51.521.5365.75650.2213.631463.00配水管网8~99~1010~1111~1212~1313~142.85031.6143.501459.481215108.182.53318.842.88030.60110.00106.639061066.392.60.705.68031.20312.00426.556245118.672.51842.7868031.28845.004.6691622035.112.52115.44610030.81235.00144.016885040.595.51847.9914~15610030.81220.00144.016882880.3415.55207.97合计372.8020861.83序号14~1515~1616~1717~1818~1919~2020~2121~2222~23流量（L/s)管径（mm）0.10.150.20.20.40.60.811.2152020505050505050缩小值2.52.52.5333333流速（m/s）0.8150.6240.8320.1150.2310.3460.4610.5760.692管段长度m1.001.001.001.003.503.503.503.503.50沿程水头损失Pa局部阻力系数PaR(Pa/m)管段损失局部阻力系数ζΣζ损失值2081.50770787.194321399.456579.4465032.9392669.48510119.14132186.15832268.067982081.51787.191399.469.45115.29243.20416.99651.55938.24弯头1*2阀门0.5直流三通1弯头1直流三通1弯头1*2阀门0.5突然放大1直流三通1阀门0.5直流三通1阀门0.5直流三通1阀门0.5直流三通1阀门0.5*2直流三通1阀门0.5直流三通1阀门0.5弯头1直流三通1阀门0.5弯头1直流三通1阀门0.5弯头1直流三通1阀门0.5弯头1直流三通1阀门0.5弯头1旁流三通3阀门0.5弯头1*2弯头1*2旁流三通3阀门0.5*3Y型过滤器3软接2突然缩小32.5213.51.51.51.521.5846.10396.44352.3923.7140.91.44162.56338.66365.75回水管网22~231.45030.8073.503.870301277.052.5829.7123~2425~2626~2726~2727~281.46530.410.0084.05842840.582.5274.002.88030.60110.00106.639061066.392.60.705.68031.20312.00426.556245118.672.51842.7868031.28845.004.6691622035.112.52115.44610030.81235.00144.016885040.595.51847.9928~29610030.81220.00144.016882880.3414.871.97合计44901.6114860.27配水管网阻力Hp=372.80+20861.83=75234.63Pa 。
回水管网阻力合计Hx=44901.61+14860.27=59761.88Pa 。热水设计小时流量Qh=1500 L/h。
循环附加流量qf=15%Qh=0.15*1500=225L/h=0.0625L/s。可以忽略附加流量对水泵扬程的影响。
扬程H1=Hp+Hx=75234.63+59761.88=1349965.51Pa=13.5m。水泵扬程H=13.5+2（设备管阻）=15.5m。
NPSHa=35(PBP-9,10出口压力）-2.07（NPSHr）-15.5（供回水管道阻力）-2.0（气化压力按24℃计）-1（安全余量）等于14.43大于1米满足要求
