Tidal energy
February 26, 2010
Tidal energy, sometimes also called tidal power, is a form of hydropower that converts the energy of tides into electricity or other useful forms of power.
Tidal energy is generated by the relative motion of the water which interact via gravitational forces. Periodic changes of water levels, and associated tidal currents, are due to the gravitational attraction by the Sun and Moon. The magnitude of the tide at a location is the result of the changing positions of the Moon and Sun relative to the Earth, the effects of Earth rotation, and the local shape of the sea floor and coastlines.
Although not yet widely used, tidal power has potential for future electricity generation. Tides are more predictable than wind energy and solar power. Historically, tide mills have been used, both in Europe and on the Atlantic coast of North America. The earliest occurrences date from the Middle Ages, or even from Roman times.
SOLAR ENERGY
February 26, 2010
Solar Energy (Solar) generally refers to radiant energy of sunlight. Within the sun, carried out by the “hydrogen” gather into a “helium”, the nuclear reaction, constantly releasing tremendous amounts of energy, and to continue to space radiation energy, this energy is solar energy. This fusion reaction inside the sun, you can maintain the supremacy of several billions of Bai Yinian time. Solar radiation to space launch power of 3.8×10 ^ 23kW of radiation values, which reached 20 billionths of Earth’s atmosphere. Solar energy reaching the earth’s atmosphere, 30% reflected by the atmosphere, 23% absorbed by the atmosphere, and the rest to reach the earth’s surface, power of 80 trillion kW, ie exposure to the sun to Earth per second of energy equivalent to burning of 5 million tons of coal to release heat. Average outside air per minute per square meter area to accept the energy of about 1367w. A broad sense, many of energy on earth solar energy sources, such as wind energy, chemical energy, water potential and so on. The narrow sense is limited to solar radiation of solar light and heat, photoelectric and photochemical direct conversion.
Wind generator
February 24, 2010
The use of wind generators, wind energy is continuously put into our family to use the standard electricity, its level of savings is obvious, a family only 20 yuan a year of electricity cost of battery fluid. And now the wind turbine performance than a few years ago a significant improvement, previously used only in a few remote areas, wind generators then a 15W light bulb directly to electricity, one out of a dark and will keep the damage to bulbs. And now because of technological advances, the use of advanced chargers, inverters, wind power into a certain scientific and technological content of the small systems, and can under certain conditions, instead of the normal electricity. Mountain can take this system to be a perennial of the street at no cost; highway signs can be used it to do the night lights; mountain children can study up on it under fluorescent; urban high-rise rooftop wind motors can also be used, which not only save but also a real green power. Home wind generators, not only can prevent blackouts, but also increase the interest in life. In the tourism area, border, schools, troops and even behind the mountains, the wind generators are becoming the people’s purchasing hot. Radio enthusiasts use their own technology in wind power generation for the mountain people services to enable people to watch television and lighting, electricity and urban synchronization, but also to make himself rich labor.
Energy source
February 24, 2010
Many theories have been proposed to explain electric, magnetic, and gravitational fields, but none has received acceptance. It seems as though something has been missing.I now believe that what has been missing has been a proper understanding of the firmament, the substance or structure that was created by God on the second day of CreationWeek. Rather than just another word for our present day atmosphere, I believe the firmament is better described by the term aether, used in the last century, or by the term high energy vacuum, which is preferred by modern physicists. There have been several occasions in man’s history when energy was in short supply and the future of civilization seemed bleak. Man was running out of wood in Europe when coal was discovered. We were experiencing the limitations of coal when oil was discovered, then natural gas, and then nuclear power. Each time that man has reached a natural limit of a given energy source, another source has been revealed, one that had been present all the time but was awaiting the development of technology for its use.
Solar power
February 23, 2010
Solar power is the generation of electricity from sunlight. This can be direct as with photovoltaics (PV), or indirect as with concentrating solar power (CSP), where the sun’s energy is focused to boil water which is then used to provide power. Solar power has the potential to provide over 1,000 times total world energy consumption in 2008, though it provided only 0.02% of the total that year. If it continues to double in use every two to three years, or less, it would become the dominant energy source this century. The largest solar power plants, like the 354 MW SEGS, are concentrating solar thermal plants, but recently multi-megawatt photovoltaic plants have been built. Completed in 2008, the 46 MW Moura photovoltaic power station in Portugal and the 40 MW Waldpolenz Solar Park in Germany are characteristic of the trend toward larger photovoltaic power stations. Much larger ones are proposed, such as the 100 MW Fort Peck Solar Farm, the 550 MW Topaz Solar Farm, and the 600 MW Rancho Cielo Solar Farm. Solar power is a predictably intermittent energy source, meaning that whilst solar power is not available at all times, we can predict with a very good degree of accuracy when it will and will not be available. Some technologies, such as solar thermal concentrators have an element of thermal storage, such as molten salts. These store spare solar energy in the form of heat which is made available overnight or during periods that solar power is not available to produce electricity.
Tidal power
February 23, 2010
The tide moves a huge amount of water twice each day, and harnessing it could provide a great deal of energy – around 20% of Britain’s needs.
Although the energy supply is reliable and plentiful, converting it into useful electrical power is not easy.
There are eight main sites around Britain where tidal power stations could usefully be built, including the Severn, Dee, Solway and Humber estuaries. Only around 20 sites in the world have been identified as possible tidal power stations.
Tidal stream systems make use of the kinetic energy of moving water to power turbines, in a similar way to windmills that use moving air. This method is gaining in popularity because of the lower cost and lower ecological impact compared to barrages.
Barrages make use of the potential energy in the difference in height (or head) between high and low tides. Barrages are essentially dams across the full width of a tidal estuary, and suffer from very high civil infrastructure costs, a worldwide shortage of viable sites, and environmentalissues.
Tidal lagoons, are similar to barrages, but can be constructed as self contained structures, not fully across an estuary, and are claimed to incur much lower cost and impact overall. Furthermore they can be configured to generate continuously which is not the case with barrages.
Modern advances in turbine technology may eventually see large amounts of power generated from the ocean, especially tidal currents using the tidal stream designs but also from the major thermal current systems such as the Gulf Stream, which is covered by the more general term marine current power. Tidal stream turbines may be arrayed in high-velocity areas where natural tidal current flows are concentrated such as the west and east coasts of Canada, the Strait of Gibraltar, the Bosporus, and numerous sites in Southeast Asia and Australia. Such flows occur almost anywhere where there are entrances to bays and rivers, or between land masses where water currents are concentrated.