Alternative sources of energies

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Alternative sources of energies

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  synopsis

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SYNOPSIS

• What renewable energy ?
• History of various energies
• Définition
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What renewable energy?

• A renewable energy is a source of energy which
  is renewed rather quickly to be regarded as
  inexhaustible.
• renewable energies result from regular or
  constant natural phenomena caused by the stars,
  mainly the Sun (radiation), but also the Moon
  (tide) and the Earth (geothermal energies)
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History of various energies

• The combustion of wood
• Hydraulic power
• Wind power
• Solar energy passivates
• Geothermic energy
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The combustion of wood

• Wood used as a fuel is meant to be
• heated
• cooked
• smoke food
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Hydraulic power

• Today the water power is useful
• to produce electricity
• example - that of water mills placed along
  rivers
• - the
  stopping
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wind power

• Origin
• - windmills allowed to pump
  water or to actuate grinding stones to grind the
  grain.
• - wind mills of pumping smaller
  and having more blades than a traditional mill,
  they turn more quickly.
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Passive solar energy

• Solar energy was for a long time used like
• 
  source of energy in architecture.
• 
  allowing the realization of solar houses
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Geothermic energy

• Greeks and Romans of antiquity already knew
  the use of geothermal energy, but also wells
  province which they built to air-condition their
  dwellings.
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Various environmental technologies

• Energy of plants
• Energy of the sun
• Energy of water
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Energy of the plants

• It is about solar energy stored under organic
  form thanks to the photosynthesis. This energy is
  exploited(run) by combustion.
• This energy is considered as renewable if we
  admit that the burned quantities do not
  exceed(irritate) the produced quantities. (Ex
  wood)
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Energy of the sun

• Thermal solar energy heat production, very
  profitable for the heating in the sunny regions.
• Thermodynamics Energy production of vapor from
  the heat of the sun by concentration, then
  conversion of the vapor in electricity
• photovoltaic energy electricity production from
  the light, notably by means of solar panels.
• Solar energy passive Energy direct use of the
  light for the heating
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Energy of water

• Energy of the waves use the tidal power of the
  movement of the waves
• Energy maremotrice exit of the movement of
  water created by the tides (variations of the sea
  level, currents of tide) 
• Energy hydrolienne The water turbine use the sea
  currents  
• Energy marethermic produced by exploiting the
  difference in temperature between surface waters
  and deep water of the oceans 
• Energy osmotic The ionic diffusion caused by the
  fresh water arriving in the salted water of the
  sea is source of energy.
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Définition

• Photosynthesis  reaction taking place in plants
  in the chloroplasts where the solar energy is
  used to oxydize water and reduce the carbon
  dioxyde to synthesize organic substances
  (carbohydrates).
• Combustion exothermic reaction between a fuel
  and a combustive.
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