Figure 4: Drag Measurement. 4. As wind passes through a windmill it loses kinetic energy, slows down and, as conservation of mass tells us, the cross-sectional area of a volume bounded by streamlines will expand (see Figure 4). Use 1.23 kg/m³ as the density of airand assume no losses in the fluid system, the initial, free-stream wind velocity (U0) is 6 m/s, the windmill generates 1MW of power and its generator is 93% efficient, and the initial diameter of air (Do) is 200 m, determine:(a) D2/D₁ [1.0 - 1.2](b) The percentage of energy extracted from the air. [20% - 30%]

Answered: Image /qna-images/answer/1bed37d0-57a9-41f6-9a71-e1686ca6f4a9.jpg

Answered: Figure 4: Drag Measurement. 4. As wind…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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2. The figure shows a pipe reducing section that is bolted on to the end of a pipe. Water flows through the pipe and the reducing section and exits to the atmosphere. The diameter at station 1 is 20 cm and the diameter at station 2 is 15 cm. The velocity at station 1 is 5 m/s. water ①1 ② Figure for problem 2. (a) If h 22.5 cm, what is the force acting on the flange bolts? (b) Does Bernoulli's equation hold between stations 1 and 2? Explain. mercury
3-Water flows through D=15 cm, At a velocity of V=2.5m/s. Find A-Volume flow rate. B-Mass flow rate. C- Weight flow rate?
A certain SSSF control volume with a single inflow and outflow and has an inflow speed V₁ = 200 meters / sec and outflow speed Ve = 1000 meters / sec, with a mass-flow-rate m(dot) = 5 kg/ sec. Find the time rate of change of the kinetic energy between the outflow and inflow streams in kW (units must be correct).
A compressor draws in 500 E of air whose density is 0.079 - and discharges ft3 min it with density of 0.304- At the suction, P1 = 15- and at the discharge, P2 = in The increase in the specific internal energy is 33.8 Btu and the heat from lb 80 air by cooling is 13 . Neglecting changes of potential and kinetic energy, Btu determine the work done on the air in - and horsepower,hp. min
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A hydraulic pump delivers 12 litres per minute towards pressure of 270 bar.Find the following (a) Calculate the hydraulic power in kW (b) If the overall efficiency of the pump is given as 69% .Find the input of electric power needed to drive the pump in watts .
In fluid mechanical
2- A fixed displacement hydraulic pump has a geometric volume 12.5 cm3/rev. Operated pressure is 160 bar and the rotational speed is 1800 rev/min. Assuming the pump is ideal. Calculate, a) flow rate, Qt of the pump, b) the hydraulic power at the pump exit line, Pout, and c) the driving torque, Tt. Your answer
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Consider a pumping firetruck, which draws water from a nearby pond, and sprays a tight stream of water at a rate of 4200 L/min to the top of a building at a height of 12 m. You should consider all kinetic energy at the top of the building to be negligible. You don't know the horizontal component of velocity. It's small, don't bother. Firetruck (with pump) 12 m Pond • The firefighter holds the hose 1 m off the ground. What is the speed of the flow as it leaves the hose nozzle? • What is the diameter of the nozzle exit? • The hose from the firetruck to the firefighter has a 15 cm inside diameter. What is the pressure in the hose as it leaves the truck? Assume no losses in the hose and that the hose exits the truck a height of 1 m off the ground.
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