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good reason to switch to solar energy

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    Wednesday, 11 July 2012 11:31
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    Wednesday, 11 July 2012 11:32
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    Wednesday, 05 September 2012 12:44
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Good to know

Where does solar energy come from?

Solar energy comes from nuclear fusion which occurs in the center of the Sun. It propagates in the solar system and the universe in the form of electromagnetic radiation of photons. 

soleil

The photon is the particle associated to electromagnetic waves, radio waves to gamma rays through visible light. Produce photons inside the sun are 4,000 years to 2 million years to reach the surface, collisions with other particles. How long does the photon to arrive on earth? Earth is on average 150 million kilometers from the Sun. The speed of the photon is 300,000 kilometers per second. Therefore 500 seconds for sunlight to reach us, value is often rounded to eight minutes

 

 

 

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The solar energy received at a point of the globe depends on:

  • solar energy received from the Sun (decadal fluctuations, seasonal and ad hoc).
  • the cloud (clouds, fog, etc.)., which is important to the equator and lower in rural intertropical.
  • latitude, season and time, affecting the height of the sun and therefore the energy received per unit ground surface and the clouds in the local climate. 

 

 

Overall the earth continuously receives an output of 170 million gigawatt, which it absorbs the 122 and reflects the rest . Desert areas where cloud cover is low and which are located at latitudes near the equator are Overall the earth continuously receives an output of 170 million gigawatt, which it absorbs and reflects the 122 rest. Desert areas where cloud cover is low and which are located at latitudes near the equator are more favorable to the solar energy.

Use of energy coming from the sky

The use of solar energy is very marginal compared to nuclear power and fossil fuels! Indeed solar energy accounts for only 0.2% of global primary energy. Face depletion scheduled oil, while fighting against climate change, due to the release of greenhouse gases during the combustion of conventional fuels. Enough to kill two birds with one stone

The solar energy received on Earth each year is equivalent to more than 20 times our energy needs (source Hespul).

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Average electricity consumption per inhabitant per year

Tunisian consumes an average of 850 kWh of energy per year compared to 14,500 kWh consumed by a single American or 6800 kWh per capita one of the Emirates!

consommation

Raw materials to the production base of solar power are sand and sun. The electricity generated on the roof of the houses will soon be cheaper than that produced by conventional source! Solar energy is now becoming a true engine of economic growth comparable to the role played by the steam screen!

Germany is the leading country in this field worldwide technological future. 

The European Union committed itself at the Brussels summit to produce 20% of the total electricity consumption from renewable energy by 2020.

France has the aim of having at least 23% share of renewables in energy consumption by 2020.

The payback time for installation of photovoltaic solar panels is between 6 and 12 years depending on the installed capacity of the selected range and region in Tunisia.