Wind Energy Presentation For Non Conventional Energy Resources.

1. Wind Energy
By Ujjwal Vishwakarma

2. How it works
● Wind is a form of Solar energy
● Wind is caused by the uneven heating of
● the earth’s surface and rotation of the Earth
● Wind Turbines convert the kinetic energy in the wind to
● mechanical power
● A generator can convert the mechanical power into electricity

3. How it works
● A wind turbine works the opposite
of a fan
● The wind turns the blades, which
spin a shaft,
● Which connects to a generator and
makes electricity.
● Electricity produced is sent to
transformers where voltage is
increased and sent to the power
grid.

4. Wind Turbines
Wind turbines, like aircraft propeller
blades, turn in the moving air and
power an electric generator that
supplies an electric current. Simply
stated, a wind turbine is the opposite
of a fan. Instead of using electricity to
make wind, like a fan, wind turbines
use wind to make electricity. The wind
turns the blades, which spin a shaft,
which connects to a generator and
makes electricity.

5. Wind Turbine Types
Modern wind turbines fall into two
basic groups:
● the horizontal-axis variety, like
the traditional farm windmills
used for pumping water, and
● the vertical-axis design, like the
Darrieus model, named after
its French inventor. Most large
modern wind turbines are
horizontal-axis turbines.

6. Wind Turbine Components
Horizontal turbine components include:
● blade or rotor, which converts the
energy in the wind to rotational shaft
energy;
● a drive train, usually including a
gearbox and a generator;
● a tower that supports the rotor and
drive train; and
● other equipment, including controls,
electrical cables, ground support
equipment, and interconnection
equipment.

7. Wind Turbine Power
P = 0.5 x rho x A x Cp x V3 x Ng x Nb
● P = power in watts (746 watts = 1 hp)
● rho = air density (about 1.225 kg/m3 at sea level, less higher up)
● A = rotor swept area, exposed to the wind (m2)
● Cp = Coefficient of performance (.59 {Betz limit} is the maximum theoretically
possible, .35 for a good design)
● V = wind speed in meters/sec (20 mph = 9 m/s)
● Ng = generator efficiency (50% for car alternator, 80% or possibly more for a
permanent magnet generator or grid-connected induction generator)
● Nb = gearbox/bearings efficiency (depends, could be as high as 95% if good)

8. Wind Turbine Configurations
Wind turbines are often grouped together into a single wind
power plant, also known as a wind farm, and generate bulk
electrical power. Electricity from these turbines is fed into a
utility grid and distributed to customers, just as with
conventional power plants.
A small home-sized wind machine has rotors between 8 and 25
feet in diameter and stands upwards of 30 feet and can supply
the power needs of an all-electric home or small business.
Utility-scale turbines range in size from 50 to 750 kilowatts.
Single small turbines, below 50 kilowatts, are used for homes,
telecommunications dishes, or water pumping.

9. Advantages & Disadvantages of
Wind-Generated Electricity
Advantages Disadvantages
A Renewable Non-Polluting Resource.
Wind energy is a free, renewable resource, so no
matter how much is used today, there will still be the
same supply in the future. Wind energy is also a
source of clean, non-polluting, electricity. Unlike
conventional power plants, wind plants emit no air
pollutants or greenhouse gases.
● Cost Issue (Higher Initial
Investment).
● Constant energy cannot be
expected.
● Environmental Concerns (Noise
,avian /bat mortality).
● Supply and Transport issues.

10. Because wind turbines are such a great source of clean,
renewable energy, they’re usually greeted with a great deal
of enthusiasm. But some complaints have been made that
they can cause too much noise for residents living within a
mile of the blades.

11. Future Of Wind Energy
● Future of wind energy can be bright if government policies subsidize and
encourage its use.
● Technology improvements unlikely to have a major impact.
● Can become cost competitive for electricity generation if fossil energy costs
skyrocket.
● Wind energy technology is adapting and refining to become more efficient and
economical. One example of this: high-altitude devices, which take advantage of
the more powerful and more consistent winds at higher altitudes. This class of
emerging wind-harnessing technology, also called Airborne Wind Energy Systems
(AWES), includes airborne wind turbines like energy kites from Makani Power Inc.
● AWES technology eliminates the need for the foundations and towers of
conventional wind turbines, as well as their associated materials and maintenance
costs.

12. ThankYou