一道關(guān)于水泵效率的物理題目
一個(gè)水力發(fā)電站和湖面以及下游的溪水相差了Δz = 100m .溪水進(jìn)入到渦輪機(jī)的速率是V=6,000 dm^3/s.這個(gè)渦輪機(jī)和一個(gè)發(fā)電機(jī)相互連接提供了4.5MW的功率,效率為95%.
計(jì)算渦輪機(jī)（水泵）自身的效率,以及整個(gè)系統(tǒng)的效率和渦輪機(jī)自身的功率.水的密度為1kg/dm^3.
A hydropower station has Δz = 100 m level difference between the lake’s surface and downstream water.The water stream to the turbine has a volume rate of = 6,000 dm3/s.A turbine is coupled to an electric generator that produces = 4.5 MW power,and has = 95 % efficiency.
Calculate the efficiency of the water turbine itself in %,the overall efficiency in % and the power generated by the turbine in MW.The density of water is 1 kg/dm3.Give answers to the nearest integer.
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