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- The pump shown in the figure iswhen pumping water from a lake to a lake aboveIt gives 7.5 kW of energy to the water. your lakesThe elevation difference between the surfaces of 9 m and the loadloss is 4.5 m. under given conditionsa.) The flow through the pipes,b.) The power loss that occurs under these flow conditionsfind it.Reservolr 40 m Pump- turbine Lake FIGURE P3-86 3-87 The pump of a water distribution system is powered by a 15-kW electric motor whose efficiency is 90 percent. The water flow rate through the pump is 50 Lis. The diameters of the inlet and outlet pipes are the same, and the elevation difference across the pump is negligible. If the pres- sures at the inlet and outlet of the pump are measured to be 100 kPa and 300 kPa (absolute), respectively, determine the mechanical efficiency of the pump. Answer: 74.1 percenta hydraulic turbine receives water froma reservor at an elevation of 100 meter above it. what is the minimum water flow in (kg/sce) to produce a steady turbine output of 50 mw?
- aal 1Banrallng Mament 4mKL „Pump Reservoir 80m Well Figure 1 Your family has a small farm which needs to be watered by pumping water from a nearby well. The water needs to be continuously supplied at a rate of 0.003 m³/s through 6-cm internal diameter cast iron pipcs. The total required length of piping is measured to be 350m, with an angle valve fully open (KLvalve), a sharp-edged entrance (KLent), a rounded exit (KLexit) and ten threaded 90° bends (KLelbow). Take the efficiency of the pump to be 0.75, density and viscosity of water to be 1000 kg/m³ and 0.00131kg/m.s, respectively. Use Moody diagram for friction factor. i. Find the total head loss, httotal given that the pipe diameter is constant. ii. Determine the rated power of the pump that needs to be purchased, in kW. iii. Propose one practical way to reduce the total head loss, hL.totalA geothermal power plantwas installed at the rear side diff of Mayon Terrain that generates thermal energy at wall head equal to 14570 Joules What is the thermal energy at final stage in kjoules, if the total work is 10,820 Joules? 1.72 KJ B 1.95 KJ (c) 257 KJ 3.75 KJ
- A square bottomed tank measures 25*25*160cm and is positioned with the bottom of the tank 1m above sea level and at 20degreesC. The tank is 90% filled with water and 10% air. A water inlet enters the centre of the tank of 10mm diameter, and no other inlet or outlet is open within the tank. A pump drives water at a starting rate of 450ml/min at 0 Pa lowering to 350ml/min as the pressure increases to 800 kPa. The pump and tank are connected by a 10mm diameter pipe with k=0.15 for all fittings and tubing. It should be assumed this is the maximum flow and pressure provided by the pump. The pump will stop instantaneously once the pressure reaches 800kPa. The relationship between flow and pressure from the pump should be assumed linear. What will be the volume of compressed air inside the tank and how long will it take to fill?A hemispherical tank of radius 3m is filled with 4500 liters of water. Find the time it will take to empty the tank when the water is pumped out to the top of the tank using a pump with 10kW power. O Zoom image 5.12hours ↓ 16.24hours 11.46hours 4.11hourson the island, hydropower is expected to be extracted from a river of the river system via a pipe, 74 m long, to a turbine.During the dry season, from February to May the average daily flow rate of the river is 35 m3s-1 and for the remaining 8 months, the average daily flow rate of the water is 115 m3s-1. Assume, the initial capacity expenditure evaluated on a yearly basis of the run of a river system is $900 000, the annual operating cost is $17 500; and the density of water is 1000 kg ∙m-3.Considering the run of the river system above, determine(i) the energy potential at the source for one year,(ii) the levelized cost of electricity, and(iii) compare the LCOE value and the cost of electricity, and comment on the capital investment.
- You are asked to explore the operating principles and efficiencies of hydraulic machines. You have a pump-turbine system, which is a system that is used by some power plants for energy storage by pumping water during periods of low demand and for electricity generation during periods of high demand. You are required to: A) Determine the input power required for a pump that is attached to the end of a pipeline with a height of 40 m to pump water into the storage tank at a volumetric flow rate of 0.01 m³/s if its efficiency is 70 %. B) Calculate the efficiency of a water turbine if the available head at the turbine inlet is 30 m, the mass flow rate is 100 kg/s, and the output electricity is 25 kW. C) Identify the types of water turbines and the limitations that exist within these different types? D) From your external reading and point of view, discuss the ecological impact of hydroelectric power then suggest remedies for solving this issue?Your second customer wants to determine the required electrical power, which will be used to pump waterwith the following design specifications: The pump loses 3 kW in the form of heat to its surrounding. The inlet and the exit conditions of the water are as indicated in Figure 2. The pipe diameter is 5 cm.Cavitation tests are being done on a model pump with an impeller diameter of 20 cm and an inlet pipe diameter of 8 cm. Pumping water at 80°C and running at 2400 rpm, it is observed to cavitate when the static pressure at the inlet is 80 kPa and the flow rate is 1800 L/min. Find the required NPSH of a prototype pump that is 6 times larger and runs at 1000 rpm while pumping water at the same temperature. Answer Table Description Value Required NPSH for prototype (m)