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Q: A farmer is to pump water from a river to a water storage tank nearby using a 125- ft-long, 5-in-diameter plastic pipe with three flanged 90° smooth bends. The water velocity near the river surface is 6 ft/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 12 ft. For a flow rate of 1.5 ft/s and an overall pump efficiency of 70 percent, determine the required electric power input to the pump. The density and dynamic viscosity of water are p = 62.30 lb/ft³ and u = 6.556×104 lb/ft-s. The roughness of galvanized iron pipe is ɛ = 0.0005 ft. (Kelbows = 0.3 each), and a sharp-edged exit (KL = 1.0). Neglect losses at entrance. Use the following equation to solve for f and compare it with Moody chart. e/D 2.51 -2log + 3.7 Colebrook equation ..... .... Revi) 2 5 in Water 125 ft tank 12 ft 1.5 ft'/s River

Q: A farmer is to pump water from a river to a water storage tank nearby using a 125- ft-long, 5-in-diameter plastic pipe with three flanged 90° smooth bends. The water velocity near the river surface is 6 ft/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 12 ft. For a flow rate of 1.5 ft/s and an overall pump efficiency of 70 percent, determine the required electric power input to the pump. The density and dynamic viscosity of water are p = 62.30 lb/ft³ and u = 6.556×104 lb/ft-s. The roughness of galvanized iron pipe is ɛ = 0.0005 ft. (Kelbows = 0.3 each), and a sharp-edged exit (KL = 1.0). Neglect losses at entrance. Use the following equation to solve for f and compare it with Moody chart. e/D 2.51 -2log + 3.7 Colebrook equation ..... .... Revi) 2 5 in Water 125 ft tank 12 ft 1.5 ft'/s River

Sustainable Energy
Sustainable Energy
2nd Edition
ISBN:9781337551663
Author:DUNLAP, Richard A.
Publisher:DUNLAP, Richard A.
Chapter14: Ocean Thermal Energy Conversion And Ocean Salinity Gradient Energy
Section: Chapter Questions
Problem 14P
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Q: A farmer is to pump water from a river to a water storage tank nearby using a 125- ft-long, 5-in-diameter plastic pipe with three flanged 90° smooth bends. The water velocity near the river surface is 6 ft/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 12 ft. For a flow rate of 1.5 ft/s and an overall pump efficiency of 70 percent, determine the required electric power input to the pump. The density and dynamic viscosity of water are p = 62.30 lb/ft³ and u = 6.556×104 lb/ft-s. The roughness of galvanized iron pipe is ɛ = 0.0005 ft. (Kelbows = 0.3 each), and a sharp-edged exit (KL = 1.0). Neglect losses at entrance. Use the following equation to solve for f and compare it with Moody chart. e/D 2.51 -2log + 3.7 Colebrook equation ..... .... Revi) 2 5 in Water 125 ft tank 12 ft 1.5 ft'/s River
Transcribed Image Text:Q: A farmer is to pump water from a river to a water storage tank nearby using a 125- ft-long, 5-in-diameter plastic pipe with three flanged 90° smooth bends. The water velocity near the river surface is 6 ft/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 12 ft. For a flow rate of 1.5 ft/s and an overall pump efficiency of 70 percent, determine the required electric power input to the pump. The density and dynamic viscosity of water are p = 62.30 lb/ft³ and u = 6.556×104 lb/ft-s. The roughness of galvanized iron pipe is ɛ = 0.0005 ft. (Kelbows = 0.3 each), and a sharp-edged exit (KL = 1.0). Neglect losses at entrance. Use the following equation to solve for f and compare it with Moody chart. e/D 2.51 -2log + 3.7 Colebrook equation ..... .... Revi) 2 5 in Water 125 ft tank 12 ft 1.5 ft'/s River
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