Solar energy is derived ultimately from the sun. It can be divided
into direct and indirect categories. Most energy sources on Earth
are forms of indirect solar energy, although we usually don't think
of them in that way. Coal, oil and natural gas derive from ancient
biological material which took its energy from the sun (via plant
photosynthesis) millions of years ago. All the energy in wood and
foodstuffs also comes from the sun.Movement of the wind (which
causes waves at sea), and the evaporation of water to form rainfall
which accumulates in rivers and lakes, are also powered by the sun.
Therefore, hydroelectric power and wind and wave power are forms of
indirect solar energy. Direct solar energy is what we usually mean
when we speak of solar power. Chr(45) is the use of sunlight for
heating or generating electricity. Solar energy research and
applications have been receiving increasing attention throughout
the world as solar energy must play a much greater role in the
energy mix in upcoming years. This book examines new research in
this frontier field.
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