流体输配管网课后习题答案详(20)

Pd7′=50.6Pa Rm=0.29Pa/m ξ=0.047 ΔP=16.5×0.29+0.047×0.6×9.182=7.14 Pd8=50.6-7.14=43.5Pa 8．8-9管段

L=14×104 Vd=8.51m/s F=4.57m2 a=2138mm 取a=2140 V实=8.49m/s Pd8′=43.3Pa Rm=0.2Pa/m ξ=0.043 Pd9=43.5-0.2×16.5-0.043×0.6×8.492=38.4Pa 9．9-10管段

L=12×104 Vd=8.00m/s F=4.169m2 a=2042mm 取a=2040 V实=8.01m/s Pd9′=38.5Pa Rm=0.25Pa/m ξ=0.037 Pd10=38.5-0.25×16.5-0.037×0.6×8.012=32.9Pa 10．10-11管段

L=10×104m3/h Vd=7.41m/s F=3.749m2 a=1936mm 取a=1940mm V实=7.38m/s Pd10′=32.7Pa Rm=0.21Pa/m ξ=0.03 Pd11=32.7-16.5×0.21-0.03×0.6×7.382=28.3Pa 11．11-12管段

L=8×104 Vd=6.86m/s F=3.238m2 a=1799.5mm 取a=1800mm Pd11′=28.3Pa Rm=0.2Pa/m ξ=0.02 Pd12=28.3-16.5×0.2-0.02×0.6×6.862=24.4Pa 12．12-13管段

L=6×104 Vd=6.38m/s F=2.618m2 a=1616mm 取a=1600mm V实=6.51m/s Pd12′=25.4Pa Rm=0.22Pa/mξ=0.015 Pd13=25.4-16.5×0.22-0.015×0.6×6.512=21.4Pa 13．13-14管段

L=4×104 Vd=5.97m/s F=1.861m2 a=1364mm 取a=1360mm V实=6.01m/s Pd13′=21.7Pa Rm=0.23Pa/mξ=0.017 Pd14=21.7-0.23×16.5-0.017×0.6×6.012=17.5Pa 14．14-15管段

L=2×104 Vd=5.41m/s F=1.027m2 a=1013mm 取a=1000mm V实=5.56m/s Pd14′=18.5Pa Rm=0.28Pa/mξ=0.07 Pd14=18.5-0.28×16.5-0.07×0.6×5.562=12.6Pa>0 第3章 液体输配管网水力特征与水力计算

3-1 计算例题3-1中各散热器所在环路的作用压力tg=95℃，tg1=85℃，tg2=80℃，tn=70℃。

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