This more importantly unlimited power source. Planet earth

This continuously changing world of ours which is going
through a technological advancement process every moment needs a better and
everlasting power source as solar energy. Sun, a sphere of hot plasma is the
star center of solar system, and the provider of solar energy is one of the
most important sources of energy available to earth. The acceptance of solar
energy as the energy for the greener future has been confirmed by the
scientists all over world. Developed countries of the world have already
invested in modernizing the technology for making solar energy more applicable
for the future.

Solar energy sustains an important position among all the
renewable energy sources available. Though, solar energy comes with a higher
cost of conversion but abundant supply makes it reliable to proceed. Investment
in the development of solar energy will have longer time benefits on issues
like lowering the cost of managing global warming, reducing pollution and more
importantly unlimited power source. Planet earth absorbs approximately 3850000 EJ per year. This number is
about two times higher than the amount of energy can be obtained from of all
non-renewable combined at once. In order to turn this huge solar power into
usable electric power, we need modify existing technology into more advance
state or we have to invent new technology. Solar power is the converted sun
light into electricity through the direct process Photovoltaic in short PV or
the indirect one, Concentrated Solar Power in short CSP. PV is method we use on
rooftops of houses or offices. This method converts light into electric energy
using photoelectric effect. CSP uses lenses or mirrors and advanced tracking
system to concentrate a large area of sunlight into a small beam and use it
uses it as a heat source of a conventional power plant. There is also a hybrid
system which operates by using the main principles of these two forms. For
general people, PV is more convenient for everyday use at present and all the
technology for renewable energy sources it more frequently seen all over the
world.

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Technological development
is an ongoing process for solar power. Solar power usage has come a long way
from warming water in households to lighting bulbs. In households people use
solar panels, which is an outcome of PV technology. The solar panels consisted
of solar cells converts lights into electricity. First solar cell was invented
by Charles Fritts in 1880. German Engineer Bruno Lange developed a photo cell
using silver selenide in 1931. His prototype was not cost efficient as it
converted less than 1% light to electricity. In 1954, Gerald Pearson, Calvin
Fuller and Daryl Chapin created silicon solar cell which had efficiencies of
4.5%-6% at the unit cost of $286.Mordern PV system produces DC power by
rippling with the sunlight’s intensity. For practical use this needed to be
converted into AC current by a converter. Multiple modules are wired together
to produce power at desired condition maintain required voltage, frequency and
phase. CSP is form which is more industrial usable than residential. Stirling
dishand, compact linear Freshnel relector, parabolic through are some of best
known concentration technologies available. There are various techniques
available to track and focus light. These systems use heated working fluids by
the sun to generate power. Thermal storage efficiency allows up to 24 hour
electricity generation. In this method a parabolic through is used. This is
consisted of a liner parabolic reflector that concentrates light onto a
receiver. This receiver is a tube positioned along the focal points of the
linear parabolic mirror and is filled with a working fluid. This reflector
follows the sun by tracking along a single axis. Parabolic through systems
provide best land use factor of any solar technology.

From the early development
of solar power technology to present world, the humanity and science have come
a long way in search of knowledge and advancement. Solar energy research
primarily started with an expectation that coal would soon become scarce.
Electrification with solar energy is much more efficient and therefore leads to
a significant reduction in primary energy requirements; because most renewables
don’t have a steam cycle with high losses (fossil power plants usually have
losses of 40 to 65%).But now it is not only about insufficiency of fuel. If we
want to live in a greener, prosperous, healthy world, we must invest our labor
and money on solar energy, which is unlimited free and environment friendly.