SOLAR ENERGY
by Antonio C. Antonio
January 8, 2015
What is solar energy?
Solar energy comes to earth from the sun as photons (particles of light
energy) of electromagnetic waves ranging from short to long wavelengths. Solar energy is also an important source of
renewable energy using a range of ever-evolving technologies that harness
radiant light and heat from the sun.
Such technological applications at present are solar heating, solar
photovoltaics, solar thermal energy, solar architecture and artificial
photosynthesis.
Solar energy that reaches the earth’s surface is
approximately 4% ultra violet, 44% visible light, and 52% infra red and long
waves. The higher and more intense
energy wavelengths are screened out by the ozone and oxygen in the atmosphere
while most of the infrared radiation is filtered by water and carbon dioxide in
the atmosphere before it reached the surface of the earth. This is just to highlight the important role
the ozone layer plays as it is being depleted by chlorofluorocarbon (CFC) which
is an organic compound that contains only carbon, chlorine, and fluorine,
produced as a volatile derivative of methane, ethane and propane.
Solar energy can be converted into solar power which is a
renewable source of energy. Solar energy
comes in either passive solar or active solar depending on the method of
capturing, storage and distribution of solar energy. Active solar techniques include the use of photovoltaic
systems, concentrated solar power and solar water heating to harness the
energy. Passive solar techniques include
orienting buildings and other man-made infrastructure to the sun, selecting
materials with favourable thermal mass or light dispersing properties, and
designing spaces that natural cross ventilation and circulation of air.
Here is a wrong notion on solar energy… Although solar
energy is a welcomed alternative energy source, climate change is also being attributed
to solar energy. The depletion of the
ozone layer through the introduction of CFC in the atmosphere by humans causes
more radiation to reach the earth’s surface; which, in turn, should be the
reason for global warming and changes in the earth’s climactic conditions. Climate change is largely anthropogenic or
man-made and is never directly caused by solar energy.
Just my little
thoughts…
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Hi. your article fanttastic. Thanks for posting
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