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Unformatted text preview: a) A farmer is to pump water from a river to a water storage tank nearby using a 38.1 m long. 0.125 m-diameter plastic pipe with three flanged 90 smooth bends. The water velocity near the river surface is 1.8 m/s, and the pipe inlet is placed in the river normal to the flow direction of water to take advantage of the dynamic pressure. The elevation difference between the river and the free surface of the tank is 3.6 m. For a flow rate of 0.04 m'/s and an overall pump efficiency of 70 percent, determine the required electric power input to the pump. b) Instead of buying a plastic pipe for the system the farmer could get a galvanized iron pipe from his neighbour for free. Discuss the implication in terms of the pump power. (~3.755 kW) 2 O.Gu , 3 3.24 P 2 02 V= eIn + 24 + withp a 25 the Re + 22 + 23 by. [f5 4 Ex ] Zke Kamy * 3 Key + be 0.63 3. 0.3 Lo V .D O.us . 304 _ 4.07 -65 f = 0,013S up - 3.6 4 3.24 1 0. 135 D.iw- + (. 93 ] - 25 z 6.694 Ppa PQ . hp .G 3.758 bw M . 0.7...
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Christopher Reinemann
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