Alternative Energy & Sources
The modern human community is depended greatly on the use of focil fuel like coal oil, gas and Nuclear fission. as sources of energy. But these sources of energy firstly polluting our the environment very fast secondly they are getting extinct and ultimately our existance in this universe is shortened.
Energy is the ability to do work. While energy surrounds us in all aspects of life, the ability to harness it and use it for constructive ends as enconomically as possible is the challenge before mankind. Alternative energy refers to energy sources which are not based on the burning of fossil fuels or the splitting of atoms. The renewed interest in this field of study comes from the undesirable effects of pollution (as witnessed today) both from burning fossil fuels and from nuclear waste byproducts. Fortunately there are many means of harnessing energy which have less damaging impacts on our environment. Here are some possible alternatives: 1.Solar 2.Wind Power 3.Geothermal 4.Tidal power 5.Hydro power 6.Bio mass
1.Solar energy:
Solar energy is one the most resourceful sources of energy for the future. One of the reasons for this is that the total energy we recieve each year from the sun is around 35,000 times the total energy used by man. However, about 1/3 of this energy is either absorbed by the outer atmosphere or reflected back into space (a proccess called albedo)1.
Solar energy is presently being used on a smaller scale in furnaces for homes and to heat up swimming pools. On a larger scale use, solar energy could be used to run cars, power plants, and space ships (like the picture you see above) .
Click to learn more………….(A)
2.Wind power:
Wind power is another alternative energy source that could be used without producing by-products that are harmful to nature. Like solar power, harnessing the wind is highly dependent upon weather and location. The average wind velocity of Earth is around 9 m/sec. And the power that could be produced when a wind mill is facing the wind of 10 mi/hr. is around 50 watts.1
How a Basic Windmill Work
The fins of a windmill rotate in a vertical plane which is kept perpendicular to the wind by means of a tail fin. As wind flow crosses the blades of the windmill, it is forced to rotate and can be used to generate electricity. Another type of wind power generator is the two hollow half-drum-type wind collectors. This wind collector rotates in a single vertical axis, making this device independent of the wind direction, which may generate more electricity.
Here some information sites:
Wind Techology
Building the Best Windmill
Windmills at Work
Kollitz Energy Systems
Frisse Wind
3. Geothermal Energy:
What is GEOTHERMAL ENERGY ???
Geothermal energy is an alternative energy source, although it is not resourceful enough to replace more than a minor amount of the future’s energy needs. Geothermal energy is obtained from the internal heat of the planet and can be used to generate steam to run a steam turbine. This in turn generates electricity, which is a very useful form of energy.
The radius of the Earth is about 4000 miles, with an internal core temperature of about 4000 degrees celsius at the center. The mantle surrounds the outercore and is only about 45 miles below the surface, depending on location. The temperature at the mantle-surface crust boundary is about 375 degrees, celsius. (This is too deep to get to…as of today)
The centre of the Earth is around 6000 degrees Celsius – hot enough to melt rock. Even a few kilometres down, the temperature can be over 250 degrees Celsius.
In general, the temperature rises one degree Celsius for every 36 metres you go down.
In volcanic areas, molten rock can be very close to the surface.
Geothermal energy has been used for thousands of years in some countries for cooking and heating.
The name “geothermal” comes from two Greek words: “geo” means “Earth” and “thermal” means “heat”.
So…what???
So, how does this help us? It turns out that if we drill down only three miles we can reach temperatures of 100 degrees, celsius, which is enough to boil water to run a steam-powered electric powerplant. Drilling three miles through the earth is possible, but not easy, so luckily there are easier routes to access this power source, known as geothermal hotspots.
What’s a Hotspot?
Geothermal hotspots are volcanic features which are found all around the world. Basically a hotspot is an area of reduced thickness in the mantle which transmits excess internal heat from the interior of the earth to the outer crust. These hotspots are well known for their unique effects on the surface, such as the volcanic islands of Hawaii, the mineral deposits and gyesers in Yellowstone National Park, or the hotsprings in Iceland. These geothermal hotspots can easily be used to generate electricity.
How do Geothermal-Energy Systems Work?
Some systems pump hot-water into permeable sedimentary hospots found underground and then use the steam to generate electricity. Then the used steam is condensed and sent back down to the permeable sedimentary stream. Another system utilizes volcanic magma which is still partly molten at around 650 degrees, celsius, to boil water which would generate electricity. Also there is a system which uses hot dry rock, which is just hardened magma, but still is extremely hot. To recover this heat from these rocks, a system is used which circulates water through the rock and transfers the heat up to a steam generator. The first system listed here is not as useful as other methods because of the acidic nature of the fluids found under the ground. These acidities require a lot of maintenance and upkeep on the equipment, and this cost reduces the economic effectiveness of the system. Therefore, geothermal energy systems are more inefficient than other alternative energy sources because of the costs required in upkeep and the shortage of potential sites.
For more information on geothermal energy we can visit the following web sites
Geothermal Heat Pump Consortium National Information Resource Center
International Geothermal Association
Geothermal Information System
Government agencies
Click to learn more about Geothermal Energy
4.Tidal Power:
Even the power of the tides can be harnessed to produce electricity.
Similar to the more conventional hydroelectric dams, the tidal process utilizes the natural motion of the tides to fill reservoirs, which are then slowly discharged through electricity-producing turbines. The former USSR produced 300 MW in its Lumkara plant using this method.
for more information..look into Sustainable Ocean Energy Sources.
5.Hydroelectricity
Hydroelectricity comes from the damming of rivers and utilizing the potential energy stored in the water. As the water stored behind a dam is released at high pressure, its kinetic energy is transferred onto turbine blades and used to generate electricity. This system has enormous costs up front, but has relatively low maintenance costs and provides power quite cheaply. In the United States approximately 180,000 MW of hydroelectric power potential is available, and about a third of that is currently being harnessed.
Here is more imformation on hydroelectricity:
Hydroelectic Home
US Army Core of Engineers
Hydro Data for Columbia & Snake River Projects
Reclamation’s Role In Hydropower
BC Hydro Power System Map
6.Biomass Energy
Biomass is plant matter such as trees, grasses, agricultural crops or other biological material. It can be used as a solid fuel, or converted into liquid or gaseous forms, for the production of electric power, heat, chemicals, or fuels. By integrating a variety of biomass conversion processes, all of these products can be made in one facility, called a biorefinery. NREL is working to develop cost effective, environmentally friendly biomass conversion technologies to reduce our nation’s dependence on foreign oil, improve our air quality, and support rural economies. Learn more about biomass.
