The Sun, source of life and origin of other forms of energy that man has used since the dawn of history, can meet all our needs, if we learn how to make a rational manner that continually shed light on the planet. Has shone in the sky for about five billion years, and is estimated to have not yet reached even half of its existence.
This year, the sun casts on the earth four thousand times more energy than we consume.
Spain, for its privileged location and climate, is particularly favored compared to other European countries, since on every square meter of land per year affecting about 1,500 kilowatt-hours of energy, similar to many regions of Central and South America. This energy can be used directly or be converted into other useful forms, for example, into electricity.
It would be wise not to try to take advantage, by all means technically possible, this free energy source, clean and renewable, it can definitely get rid of dependence on oil or other unsafe alternatives, pollutants or, simply, exhaustible.
must, however, noted that there are some problems that we face and overcome. Apart from the difficulties an advanced solar energy policy would result in itself, it should be noted that this power is subject to continuous fluctuations and more or less abrupt. For example, solar radiation is lower in winter, usually just when they most need.
is vital to continue the development of the emerging technology of capture, accumulation and distribution of solar energy, to create conditions that make it definitely competitive on a global scale.
What can be achieved with solar energy?
Basically, properly collecting radiation solar, we can get heat and electricity.
The heat is achieved through the use of solar thermal collectors, and electricity through the photovoltaic modules. Both processes have nothing to do with each other, or in terms of its technology or its implementation. Let
first heat utilization systems. The heat collected in the collectors can be used to meet many needs. For example, you can get hot water for domestic or industrial consumption, or to provide heat to our homes, hotels, schools, factories, etc. We can even swimming pools and air conditioned bath allow for much of the year.
also and although it may seem strange, another of the most promising applications of solar heat is cooling during the warm season. precisely when there is sunlight. Indeed, for cold is necessary to have a "hot source", which may well be caused by solar collectors installed on the roof or roof. In Arab countries and operate air conditioners that use solar energy effectively.
agricultural applications are very broad. Solar greenhouses are available with greater and earlier harvests, agricultural dryers consume far less energy when combined with a solar system, and, to cite another example, can operate desalination plants or water purification without consuming any fuel.
The "solar cells", arranged in solar panels and produce electricity in the first space satellites. Currently emerging as the ultimate solution to the problem of rural electrification, with a clear advantage over other alternatives because, lacking panels moving parts, are totally impervious to the passage of time, do not pollute or cause any noise at all, do not consume fuel and maintenance free. Furthermore, although with less efficiency, also work on cloudy days, since they capture the light filtering through the clouds.
Electricity thus obtained can be used directly (for example, to draw water from a well or water by an electric motor), or be stored in batteries for use in the night. It is also possible to inject the electricity generated in the overall network, obtaining a significant benefit.
If you get the price of solar cells continues to decline, starting large-scale manufacture, it is likely that the second decade of the century, much of the electricity consumed in rich countries has its origin in sun photovoltaic conversion.
solar energy can be perfectly complemented with other conventional energy sources, to avoid the need for large and expensive storage systems. Thus, a well-insulated house can have solar heating and hot water, with the support of a conventional gas or electrical work only during periods without sun. The cost of "energy bill" would be only a fraction of that achieved without the existence of the solar system.
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