Solar power describes a number of methods of harnessing energy from the light of the Sun. It has been present in many traditional building methods for centuries, but has become of increasing interest in developed countries as the environmental costs and limited supply of other power sources such as fossil fuels are realized. It is already in widespread use where other power supplies are absent, such as in remote locations and in space.
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admittedly it is a very nice process for gathering energy but consider this, if you say happen to live in the northern states where theres little to no constant sun shine?? its just not ethical for most states due to weather conditions like snow
With Solar Power (Panel Type), one needs to have a backup power, like a battery. If the light is not strong, the batteries kicks in to provide the power.
There is another type of solar power, that is, the concentrated one, wherein sunlight is concentrated to one spot only by using mirrors or convex lenses.
This is so hot that it can boil water very fast. You can also convert this to steam powered generator.
So, there's a lot of ways in harnessing the heat or the light of the sun to produce energy.
Surely in the states where there is a lot of snow the snow would reflect the solar power and concentrate it helping to reduce the need for all of the giant mirrors used within conventional solar power stations. I admit that there wouldn't be that much sun, but for what there is would it be worth it? Or better still create a solar power station up in the Artic and in the antartic, since there would be 6 months worth of sun which should produce a decent amount of energy. Probably not practical since:
You would need to move all of the parts down there.
What would we do with the energy once we got it? An extensive cable network?
Really hard to repair it if it got broken
But still it's only an idea.
Please use quote tags when posting other peoples work. Tags added by Moderating Team
Solar Radiation reaches the Earth's upper atmosphere at a rate of 1366 watts per square meter (W/m2). The first map shows how the solar energy varies in different latitudes.
While traveling through the atmosphere 6% of the incoming solar radiation (insolation) is reflected and 16% is absorbed resulting in a peak irradiance at the equator of 1,020 W/m˛. Average atmospheric conditions (clouds, dust, pollutants) further reduce insolation by 20% through reflection and 3% through absorption. Atmospheric conditions not only reduce the quantity of insolation reaching the earth's surface but also affect the quality of insolation by diffusing incoming light and altering its spectrum.
The second map shows the average global irradiance calculated from satellite data collected from 1991 to 1993. For example, in North America the average insolation at ground level over an entire year (including nights and periods of cloudy weather) lies between 125 and 375 W/m˛ (3 to 9 kWh/m˛/day). This represents the available power, and not the delivered power. At present, photovoltaic panels typically convert about 15% of incident sunlight into electricity; therefore, a solar panel in the contiguous United States on average delivers 19 to 56 W/m˛ or 0.45 - 1.35 (kW·h/m˛)/day.
The dark disks in the third map on the right are an example of the land areas that, if covered with 8% efficient solar panels, would produce slightly more energy in the form of electricity than the total world primary energy supply in 2003. While average insolation and power offer insight into solar power's potential on a regional scale, locally relevant conditions are also important to the potential of a specific site.
After passing through the Earth's atmosphere, most of the sun's energy is in the form of visible and Infrared radiations. Plants use solar energy to create chemical energy through photosynthesis. Humans regularly use this energy burning wood or fossil fuels, or when simply eating the plants.
A recent concern is global dimming, an effect of pollution that is allowing less sunlight to reach the Earth's surface. It is intricately linked with pollution particles and global warming, and it is mostly of concern for issues of global climate change, but is also of concern to proponents of solar power because of the existing and potential future decreases in available solar energy. The order of magnitude is about 4% less solar energy available at sea level over the timeframe 1961–90, mostly from increased reflection from clouds back into outer space.
Types of technologies
Many technologies have been developed to make use of solar radiation. Some of these technologies make direct use of the solar energy (e.g. to provide light, heat, etc.), while others produce electricity.
Solar design in architecture
Main article: Passive solar building design
Solar design in architecture involves the use of appropriate solar technologies to maintain a building’s environment at a comfortable temperature through the sun's daily and annual cycles. It may do this by storing solar energy as heat in the walls of a building, which then acts to heat the building at night. Another approach is to keep the interior cool during a hot day by designing in natural convection through the building’s interior.
Solar heating systems
Main articles: Solar hot water and Solar combisystem
Solar hot water systems use sunlight to heat water. They may be used to heat domestic hot water or for space heating. These systems are basically composed of solar thermal collectors and a storage tank. The three basic classifications of solar water heaters are:
* Active systems which use pumps to circulate water or a heat transfer fluid.
* Passive systems which circulate water or a heat transfer fluid by natural circulation. These are also called thermosiphon systems.
* Batch systems using a tank directly heated by sunlight.
A Trombe wall is a passive solar heating and ventilation system consisting of an air channel sandwiched between a window and a sun-facing wall. Sunlight heats the air space during the day causing natural circulation through vents at the top and bottom of the wall and storing heat in the thermal mass. During the evening the Trombe wall radiates stored heat.
A transpired collector is an active solar heating and ventilation system consisting of a perforated sun-facing wall which acts as a solar thermal collector. The collector pre-heats air as it is drawn into the building's ventilation system through the perforations. These systems are inexpensive and commercial models have achieved efficiencies above 70%. Most systems pay for themselves within 4-8 years.
I read somwhere just recently that there has been a breakthrough in solar panel tech that now allows for solar panels with 40% efficiancy, which is more than double the best efficiancy they used to have. Don't know if the new pannels are on the market yet, but that news is pretty exciting.
If I can find the article I'll post a link.
(PS - Fright Night, if you are going to quote an article like that, you really should use quote tags and cite your source. It's not only the rules, it's also the ethical thing to do.)
edited for spelling errors
Please to tell about mppt controller tooo
By using solar energy we can reduce so much coal consumption, which results in a healthy environment for upcoming generations.
Solar power is the next big thing. It's the easiest way to harness renewable energy. It's not as cumbersome as wind turbines, and it's something you can put on your rooftop. Certain countries are already moving to more renewable power and solar is th ebig one. Many countires have goals to be completely renewable by a certain deadline, and solar is a big way of meeting that deadline and goal. The prices for solar power have dropped significnatly -- that is to say that the cost for installing an dbuilding solar panels has dropped exponentially in the past few years. With this trend continuing, it is hopeful that solar power will be on par with the other sources of energy like gas, oil, coal in the future. This would be a good sign because that means more people would be getting renewable energy instead of fossil fuel based energy. It means that we will be moving towards a more clean energy future without at a low cost for everyone involved. It will be a win win in the future. The only problem would be if there is intense lobbying on the part of these companies right now that depend on fossil fuel.
why solar energy took so long to get global expansion? price?
|zlato22 wrote: |
|why solar energy took so long to get global expansion? price? |
Price? of course.
The others are instability, pollution, exotic materials, and installation space.
Instability : Access to sunlight is limited at certain times and by the weather.
Pollution : What? Isn't solar energy the savior of earth for Green House Effect?
Manufacturing processes of solar panels used lots of electricity, waters, chemicals, rare materials,
and are associated with greenhouse gas emissions
- Nitrogen trifluroide, sulfur hexafluoride and others.
These are some of the most potent greenhouse gases
and have many thousand times the impact on global warming compared to carbon dioxide.
|EquiSolar wrote: |
|Solar power describes a number of methods of harnessing energy from the light of the Sun. It has been present in many traditional building methods for centuries, but has become of increasing interest in developed countries as the environmental costs and limited supply of other power sources such as fossil fuels are realized. It is already in widespread use where other power supplies are absent, such as in remote locations and in space.
You can get more information from following URL
Solar is good on places
where You cannot bring electricity.