This is a question I ask myself for some time. We see a little bloom everywhere Solar Panels for the production of clean energy. My question that arose was, therefore, it "It takes energy and raw material to produce a solar panel, so after how long it was there a positive energy balance, it is ie it produces more energy than it took to its production.
The answer:
Believing that the manufacture of a solar panel consumes more energy than it provides during its lifetime is a myth. This is true for solar panels designed for the space environment, given the conditions under which they will evolve and they must have a very good performance, it does not count the energy needed to produce them and they will surely never profitable. But this is false for terrestrial solar panels. Of course, everything that occurs on Earth requires energy and, in order to estimate the value of energy product, we created the "energy balance" is simply the ratio of energy out (energy) on the incoming energy (energy required for product realization and / or production of energy out).
Example:
In the case of corn ethanol, energy balance was equal to 1.3, ie one gets 1.3 units of energy for a unit of energy needed to produce it. Ethanol from sugar cane (Brazil) it has a better energy balance, you get eight units of energy for a unit of energy necessary for its production, energy balance is equal to 8. As for gasoline, its energy balance is about 5.
But on the solar panels, it must do so? This seems wrong to apply the energy balance to solar panels because they "contain no real energy." But as they produce during their life, it is still possible to use this variable.
A study by Energy & Environmental Economics, Inc. and Siemens Solar Industries (scientists will be pleased with this study ;-)) shows that the average solar panel produces 5 times more energy than it has been necessary to production. Roughly equivalent to energy balance than gasoline (though on a time scale much longer).
The problem is that nobody is satisfied with this figure. Currently the community working on solar panels (scientists, engineers ...) seeks to increase the energy balance of the latter, that balance has been significantly improved in recent years. One of the simplest methods is to ensure that the solar panel is oriented at an angle of 90 degrees to the sun, its life is increased and the number of photovoltaic cells required is reduced.
The photovoltaic cells are very inefficient (Poly-silicon) during their production, we must try for the same efficiency to use as little as possible. One solution is to use mirrors or targets that will focus sunlight on photovoltaic cells leading to lower surface area needed (the lens effect) and therefore a smaller solar panel. Another approach is the use of materials that require less energy to produce (eg thin films DSCIG (Copper Indium Gallium sulfide) .... I'll spare you the technical details ...).
In conclusion, the solar panels have a very interesting and energy balance in their lives will produce much more energy than it has been necessary to manufacture them ... do not deprive ourselves of solar panels, especially since this energy balance continues to increase with new generations.
The answer:
Believing that the manufacture of a solar panel consumes more energy than it provides during its lifetime is a myth. This is true for solar panels designed for the space environment, given the conditions under which they will evolve and they must have a very good performance, it does not count the energy needed to produce them and they will surely never profitable. But this is false for terrestrial solar panels. Of course, everything that occurs on Earth requires energy and, in order to estimate the value of energy product, we created the "energy balance" is simply the ratio of energy out (energy) on the incoming energy (energy required for product realization and / or production of energy out).
Example:
In the case of corn ethanol, energy balance was equal to 1.3, ie one gets 1.3 units of energy for a unit of energy needed to produce it. Ethanol from sugar cane (Brazil) it has a better energy balance, you get eight units of energy for a unit of energy necessary for its production, energy balance is equal to 8. As for gasoline, its energy balance is about 5.
But on the solar panels, it must do so? This seems wrong to apply the energy balance to solar panels because they "contain no real energy." But as they produce during their life, it is still possible to use this variable.
A study by Energy & Environmental Economics, Inc. and Siemens Solar Industries (scientists will be pleased with this study ;-)) shows that the average solar panel produces 5 times more energy than it has been necessary to production. Roughly equivalent to energy balance than gasoline (though on a time scale much longer).
The problem is that nobody is satisfied with this figure. Currently the community working on solar panels (scientists, engineers ...) seeks to increase the energy balance of the latter, that balance has been significantly improved in recent years. One of the simplest methods is to ensure that the solar panel is oriented at an angle of 90 degrees to the sun, its life is increased and the number of photovoltaic cells required is reduced.
The photovoltaic cells are very inefficient (Poly-silicon) during their production, we must try for the same efficiency to use as little as possible. One solution is to use mirrors or targets that will focus sunlight on photovoltaic cells leading to lower surface area needed (the lens effect) and therefore a smaller solar panel. Another approach is the use of materials that require less energy to produce (eg thin films DSCIG (Copper Indium Gallium sulfide) .... I'll spare you the technical details ...).
In conclusion, the solar panels have a very interesting and energy balance in their lives will produce much more energy than it has been necessary to manufacture them ... do not deprive ourselves of solar panels, especially since this energy balance continues to increase with new generations.
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