Solar energy and its uses

The sun, an average star, is a fusion reactor that has been burning over 4 billion years. It provides enough energy in one minute to supply the world's energy needs for one year.

Solar energy and its uses

A team at MIT believes that this lead can be cut out of the waste stream entirely -- and put to good use creating emissions-free energy. Cheap, Flexible Solar Fri, March 20, An engineering student is tuning energy levels through surface chemistry, showing promise for higher efficiency quantum dot solar cells.

Solar Impulse completes epic flight to Hawaii Mon, August 24, Solar Impulse, the aeroplane that is powered only by the sun, has landed in Hawaii after making a historic 7,km flight across the Pacific from Japan.

Mon, November 23, A pair of researchers suggest an underground solution to store energy to keep the grid stable for total transition to renewable sources.

As a source of energy, nothing matches the sun. It out-powers anything that human technology could ever produce.

Why is solar energy important? Those fossil fuels cannot remain the dominant sources of energy forever. Whatever the precise timetable for their depletion, oil and gas supplies will not keep up with growing energy demands.

Coal is available in abundance, but its use exacerbates air and water pollution problems, and coal contributes even more substantially than the other fossil fuels to the buildup of carbon dioxide in the atmosphere.

Solar energy - Wikipedia

For a long-term, sustainable energy source, solar power offers an attractive alternative. Its availability far exceeds any conceivable future energy demands.

Solar energy and its uses

It Solar energy and its uses environmentally clean, and its energy is transmitted from the sun to the Earth free of charge. Many of the technologies to address these issues are already in hand.

Blessed afternoon po. I was a retailer of solar lighting products such as garden light and am using also a 1 watt solar energy kit for emergency purpose only. Solar Power. Solar power is produced by collecting sunlight and converting it into electricity. This is done by using solar panels, which are large flat panels made up of many individual solar cells. An engineering student is tuning energy levels through surface chemistry, showing promise for higher efficiency quantum dot solar cells.

Another popular avenue is direct production of electric current from captured sunlight, which has long been possible with solar photovoltaic cells. How efficient is solar energy technology? To make solar economically competitive, engineers must find ways to improve the efficiency of the cells and to lower their manufacturing costs.

Prospects for improving solar efficiency are promising. Current standard cells have a theoretical maximum efficiency of 31 percent because of the electronic properties of the silicon material. But new materials, arranged in novel ways, can evade that limit, with some multilayer cells reaching 34 percent efficiency.

Experimental cells have exceeded 40 percent efficiency. Another idea for enhancing efficiency involves developments in nanotechnology, the engineering of structures on sizes comparable to those of atoms and molecules, measured in nanometers one nanometer is a billionth of a meter.

Recent experiments have reported intriguing advances in the use of nanocrystals made from the elements lead and selenium. Lead-selenium nanocrystals enhance the chance of releasing a second electron rather than the heat, boosting the electric current output. Other experiments suggest this phenomenon can occur in silicon as well.

Engineering advances will be required to find ways of integrating such nanocrystal cells into a system that can transmit the energy into a circuit. How do you make solar energy more economical? Other new materials for solar cells may help reduce fabrication costs.

Current solar cell designs require high-purity, and therefore expensive, materials, because impurities block the flow of electric charge.

That problem would be diminished if charges had to travel only a short distance, through a thin layer of material. But thin layers would not absorb as much sunlight to begin with.

One way around that dilemma would be to use materials thick in one dimension, for absorbing sunlight, and thin in another direction, through which charges could travel. One such strategy envisions cells made with tiny cylinders, or nanorods.

Another approach involves a combination of dye molecules to absorb sunlight with titanium dioxide molecules to collect electric charges. But large improvements in efficiency will be needed to make such systems competitive.

How do you store solar energy? At times and locations where sunlight is plentiful, its energy must be captured and stored for use at other times and places.

Many technologies offer mass-storage opportunities. Pumping water for recovery as hydroelectric power or large banks of batteries are proven methods of energy storage, but they face serious problems when scaled up to power-grid proportions.

New materials could greatly enhance the effectiveness of capacitors, superconducting magnets, or flyweels, all of which could provide convenient power storage in many applications.Solar energy transformation is the energy that is in sunlight.

It has been used for thousands of years in many different ways by people all over the world. As well as its traditional human uses in heating, cooking, and drying.

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Solar Energy and Its Use Today 5 • Integral collector-storage system (ICS): This system contains one or more black tanks or tubes in an insulated and glazed box. A smart solar investment will provide your family with clean power and energy savings for 25 years or more.

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Solar energy and its uses

Estimate cost vs. savings. Research types of solar panels. Solar Power. Solar power is produced by collecting sunlight and converting it into electricity.

This is done by using solar panels, which are large flat panels made up of many individual solar cells. Solar energy is a free, inexhaustible resource, yet harnessing it is a relatively new idea. The ability to use solar power for heat was the first discovery.

A Swiss scientist, Horace de Saussure, built the first thermal solar collector in , which was later used to heat water and cook food.

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