- Renewable & Alternative Energy
Renewable Energy -- Moving Towards Clean Energy
Why renewable is always clean?
Renewable energy is the energy that can be used over and over again. It is called clean because there is almost neglible amount of green house emissions. Solar, wind and water are best examples of clean energy sources. An in depth article about this can be found here
Wind Energy As Alternative or Clean Energy
Wind mills or wind farms are being used since hundreds of years for pumoing water. Now a days these are used to generate electricy using wind power. Energy generated using wind farms is renewable which means it is clean energy and carbon content in this type of energy is quite low.
Wind mills are stand alone systems with large wings mounted on a tower using shaft and they take the advantage of wind to generate power.
Wind energy or alternative energy is cost effective and cleaner because it produces no emissions.
Wind Farm - Check out this video
- Wind power - Wikipedia, the free encyclopedia
Wind power is extracted from air flow using wind turbines or sails to produce mechanical or electrical power. Windmills are used for their mechanical power, wind pumps for water pumping, and sails to propel ships.
Benefits Of Using Wind Energy
Using wind energy has several advantages and it is one of the fastest gowing energy sources in the worls. Researches are on in order to make wind energy more and more accessible to energy developers by addressing the chanllenges they might be facing to start a wind farm.
It's a clean fuel source since does does not use fossil fuels like coal and gas and hence there is no carbon emission or green house emissions.
It's being used as domestic source of energy in some developed countries. In the USA, it is growing at a rate of 30% per year
It is a sustainable source of energy because this energy is produced by wind and winds are generated by heating of atmosphere. This heating is done by sunlight. So as long and sun and wind are there, this source will also be there.
It is very cost effective
It is creating jobs in several ways.
Challenges that energy developers and facing in installing a wind farm.
Installation of wind power plant is costlier than installing a traditional power source. Also, the cost effectiveness of a wind form depends on how effective a wind farm will be at the location.
It's almost impossible to find land close to city to install wind farms. This makes it hard to transfer the power to city and needs installation of power cable from plant to city.
The rotor might be noisy sometimes and hence creates disturbances for people living in nearby areas.
Turbine blades may be harmful sometimes for wildlife as it is seen that it kills birds and other animals that come its way
Types Of Wind Turbines
There are two types of wind turbines -
Vertical Axis Wind Turbines and Horizontal Axis Wind Turbines
Vertical Axis turbines ----
- They are always facing the wind – no need for steering into the wind.
- Have greater surface area for energy capture – can be many times greater.
- Are more efficient in gusty winds – already facing the gust
- Can be installed in more locations – on roofs, along highways, in parking lots.
- Do not kill birds and wild – life – slow moving and highly visible.
- Can be scaled more easily – from milliwatts to megawatts.
- Can be significantly less expensive to build – are inherently simpler .
- Can have low maintenance downtime – mechanisms at or near ground level
- Produce less noise – low speed means less noise
- Are more esthetically pleasing – to some.
Horizontal Axis Turbines ---
Variable blade pitch, which gives the turbine blades the optimum angle of attack. Allowing the angle of attack to be remotely adjusted gives greater control, so the turbine collects the maximum amount of wind energy for the time of day and season.
• The tall tower base allows access to stronger wind in sites with wind shear. In some wind shear sites, every ten meters up, the wind speed can increase by 20% and the power output by 34%.
• High efficiency, since the blades always move perpendicularly to the wind, receiving power through the whole rotation. In contrast, all vertical axis wind turbines, and most proposed airborne wind turbine designs, involve various types of reciprocating actions, requiring airfoil surfaces to backtrack against the wind for part of the cycle. Backtracking against the wind leads to inherently lower efficiency.
Vertical Axis Wind Turbine
Horizontal Axis Wind Turbine
Wind Energy Quiz
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