Water density = 1000 kg/m³ 3 %3D It is pumped from = 65 KPa to 2 MPa Isentropic efficiency = 0.80 %3D Specific work for the pump ?
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- The suction diameter of 60mm reads 2psi vaccum and 50mm diameter discharge with 250kpag. The suction water level is 5m above water pump center line and discharge water level is 25m above the pump center line. The total head loss at suction and discharge is 2m. If discharge is 0.01m3/s, find the horsepower needed to pump the water for 80% pump efficiency. ANSWER: 8.15 hpSome engineers are evaluating potential sites for a small hydroelectric dam. At one such site, the gross head is 340 m, and they estimate that the volume flow rate of water through each turbine would be 0.95 m3 /s. Estimate the ideal power production per turbine in MW.A pump has a suction condition of 50mm Hg vacuum pressure, 100mm diameter pipe and discharged condition of 250kpa at, 90mm diameter. The discharge tank is 50m elevation and the suction is 5m below the pump center line. If the discharge is 0.20 m3/s, find the pump efficiency for 260kw brake power. Answer: 74.32%
- A Kaplan turbine working under a head of 43 m deve-lops 15,400 B.H.P. The dia of theboss is 0"3 times the dia ofrunner. Determine the speed and dia of runner, if speed ratio is2, flow ratio as 0-65 and overall efficiency as 91%.A group of engineers is designing a new hydroturbine by scaling up an existing one. The existing turbine (turbine A) has diameter DA = 1.50 m, and spins at n.A = 150 rpm. At its best efficiency point, V.A = 162 m3 /s, HA = 90.0 m of water, and bhpA = 132 MW. The new turbine (turbine B) will spin at 120 rpm, and its net head will be HB = 110 m. Calculate the diameter of the new turbine such that it operates most efficiently, and calculate V.B and bhpB.A pump operates on a head of 35 m, delivering 80 L/s of I water at 80% efficiency. The pump is driven by a diesel engine by means of a chain and sprocket with a service factor of 1.4. If the horsepower per strand is 28, find the approximate number of strands needed: (Ans. 2)
- Assume we install a low-head hydroelectric plant designed to divert Q=100 m3/s from a river with a net head is h=1.5m and efficiency 40%. Suppose the river can sustain this flow 3000 hrs per year. Calculate installed capacity, expected annual energy generation, and the capacity factor. (Wrong answer will get Dislike for Sure)The hydraulic efficiency of hydro-electric turbine is 85%, find the discharge Q in liters per second. power developed is 10,500 kw and operating a head of 320 mA pump is needed to drain an excavation at a construction site. The excavation has alength of 50m, width of 50m, and a depth of 4m. The surface of the water in the excavation lies at adepth, H=3m, from the top the of the excavation. An old, radial flow, 1000W pump is immediatelyavailable for use; however, the total pump-motor efficiency, e, is only 50%. Estimate the drawdown inthe excavation in the first 4 hours of pumping. Neglect the change in H with increasing time. Neglectany head loss in the hose/pipe connected to the pump. (Hint: utilize the Pout equation, consider analternative definition of discharge as a change in volume over a change in time). Assume a specificweight of 9.79kN/m 3 .
- Q9: Find the specific speed and power consumption for pump having the following properties: (Q=0.1 m3/s), (speed=725 r.p.m) and (head =15 m).A hydro-electric power plant consumes 52,659,000 KW-hrs per annum. Expected flow is 1665 cu. m/ min and overall efficiency is 65%. What is the net head?The general energy balance equation for a turbine is: Qnet + Wnet = ΔmH + ΔKE + ΔPE What does it mean when the term ΔmH is negative? Describe what changes occured to the fluid's energy, and where it went.