Engineering, 28.04.2021 14:00 dessyrob05

Briefly identify the advantages and disadvantages of wind power in urban environments. (4 marks)
b. Wind approaches a wind turbine at 17m/s and leaves at 8.5 m/s. If the turbine has a
blade diameter of 25m, determine the turbine power and the coefficient of
3 performance. Air density 1.2 kg/m .
(7 marks)
c. The wind approaching and passing through a turbine takes a tubular form. Explain why the wind tube expands on the downstream side of the turbine blades. If a turbine has a blade diameter of 20m and has approaching and leaving velocities of 15m/s and 8m/s, what will be the cross sectional area of the expanded downstream wind tube?
( 3 marks)
d. The tip speed of a horizontal axis turbine is 70m/s and the blade swept area has a circumference of 78.5m. Determine :
i. Blade diameter
ii. Rotational speed of turbine blades in rpm (revolutions/minute)
iii. Volume flow of air approaching the turbine if the tip speed ratio is 8
iv. The turbine power delivered if the interference factor is 1/3 and the overall
efficiency of the system is 0.4
(6 marks)

Answers: 3

Show answers

Other questions on the subject: Engineering

Engineering, 04.07.2019 18:10, niicoleassssssf

Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86

Answers: 2

continue

Engineering, 04.07.2019 18:10, johnthienann58

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

Answers: 2

continue

Engineering, 04.07.2019 18:10, jesuslovesusall3

Courses that are developed by subject matter experts, internal or extemal to the college or university. these programs are marketed by the school (clo2) marks a)-vocational schools b)-vendor training c)-colleges & universities d)-continuing education programs

Answers: 2

continue

Engineering, 06.07.2019 02:30, chickennbutt0730

On solidification from a melt, the polymer polyethylene forms a semi-crystalline spherulite structure. (i) sketch an individual spherulite and label the amorphous and crystalline regions. (ii) draw a schematic to show the changes in specific volume with temperature during cooling from the melt, comparing it to the theoretical extremes of fully crystalline and fully amorphous (indicate tm and tg)

Answers: 2

continue

You know the right answer?

Briefly identify the advantages and disadvantages of wind power in urban environments. (4 marks)