A wind turbine with a 30-m rotor diameter is mounted with its hub at 50 m above a ground surface that is characterized by shrubs and hedges illustrated in Figure 2. Estimate the ratio of specific power in the wind at the lowest point that a rotor blade tip reaches to the highest point it rises to. Pes 65 m 50 m P35 35 m Crops, hedges, shrubs Figure 2 Wind turbine Table 2 Friction coefficient for various terrain characteristics Friction Coefficient Terrain Characteristics Smooth hard ground, calm water Tall grass on level ground High crops, hedges and shrubs Wooded countryside, many trees Small town with trees and shrubs 0.10 0.15 0.20 0.25 0.30 0.40 Large city with tall buildings

A wind turbine with a 30-m rotor diameter is mounted with its hub at 50 m above a ground surface that is characterized by shrubs and hedges illustrated in Figure 2. Estimate the ratio of specific power in the wind at the lowest point that a rotor blade tip reaches to the highest point it rises to. Pes 65 m 50 m P35 35 m Crops, hedges, shrubs Figure 2 Wind turbine Table 2 Friction coefficient for various terrain characteristics Friction Coefficient Terrain Characteristics Smooth hard ground, calm water Tall grass on level ground High crops, hedges and shrubs Wooded countryside, many trees Small town with trees and shrubs 0.10 0.15 0.20 0.25 0.30 0.40 Large city with tall buildings

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Estimate the amount of power generated by a wind turbine having a powercoefficient of 0.37 given the annual average wind speed:Rotor diameter = 125 mCenter of rotor at an elevation 160 m above the surface level.Location: Oklahoma City, OK
A pump lifts water between two reservoirs, the diference of elevation is AH= 25 m, through a ductile iron pipe of diametet De 118 mm and lenght L= 397 m, and roughnouss e= 0.028 mm. The pump rotational speed is RPM- 3048 rpm and its performance characteristics curve ls given by hp- 30 - 9.44 Q2 where hp is in meter and Q in Lis. (1) neglecting minor losses calculate the flow through the pump (maximum two iterations). (2) What is the type of the purp to be used. elD 2.51 eID 5.74 2log 3.7 -2log 3.7 or R 0.9 ; where Qin gpm and H in ft; Ime3.28 ft; and 1 Us13.198 gpm Hp0.75 400 centrifugale 4,000 mixed 10,000 axial
To avoid the bulky tower and impeller and generator inthe HAWT of the chapter-opener photo, we could insteadbuild a number of Darrieus turbines of height 4 m anddiameter 3 m. (a) How many of these would we need tomatch the HAWT’s 100 kW output for 15 m/s wind speedand maximum power? (b) How fast would they rotate?Assume the area swept out by a Darrieus turbine is twothirdsthe height times the diameter.
Dresden, Germany has a population of 700,000 and a population density of2200 km-2 in the urban area. Assume that the electrical needs of Dresden are an average of1.0 kWe per capita and these are satisfied by a wind farm consisting of 100 m diameterthree-rotor wind turbines operating at optimal efficiency and with optimal spacing. If thewind velocity is constant at 7 m/s, what is the area of the wind farm? The optimal efficiency, η = 0.49 and The ideal spacing for a turbine is 300m by 1000 meters Sustainable energy, 2nd edition, Ch 10, Problem 17P
In one of the pilot plants, a 30 m diameter horizontal axis wind turbines (HAWT) are mounted with its hub at 50 m above a ground surface that is covered by shrubs and hedges. For the given pilot project, estimate the ratio of power in the wind per 1 m2 of rotor area at the highest point that a rotor blade tip reaches, to the lowest point that it falls to?
Dresden, Germany has a population of 700,000 and a population density of2200 km-2 in the urban area. Assume that the electrical needs of Dresden are an average of1.0 kWe per capita and these are satisfied by a wind farm consisting of 100 m diameterthree-rotor wind turbines operating at optimal efficiency and with optimal spacing. If thewind velocity is constant at 7 m/s, what is the area of the wind farm? The optimal efficiency, η = 0.49 and The ideal spacing for a turbine is 300m by 1000 meters Answer in km2
Consider two identical wind turbines with a hub height of 40 m, one located in flat agricultural land and one located above a forest. What is the relative output power for the two turbines if the wind velocity is 10 m/s at a height of 100 m in both cases? Pagricultural/Pforest = ?
Three bladed type wind turbine with an area of 255 sq.m was installed in a windy cliff with 25 m/s velocity and 1.62 kg/m cold air density. what is the actual power if the efficiency of the turbine is 97.25%
Explain in detail the positioning and environmental impact of large wind turbines
d The efficency of fan depends Niscesity ) ,angular velocity (w). diameter of retor (D) and the dischargeO » Express the efficiency in terms of dimensionless- density ). dyvamic on
Maximizing the wind velocity of 92 m/s and 25 units of wind turbine was installed at the seaside shore. What is the total power if the area of turbine blade equal to 42 sq.m. with air density of 1.2041 Kg/cu.m. A 1.969 MW 1,968,998 Watts 4,923 watts D 49.23 MW
Calculate the blade length of a wind turbine rotor which produces a maximum power of 4 MW at a wind speed of 48 Km/Hr. Use air density as 1.23 Kg/m³, generator efficiency as 94%, gear box efficiency as 0.76 and power coefficient of blades as 0.33. Answer: