Solar energy refers primarily to the use of solar radiation
for practical ends. However, all renewable energies, other than geothermal and
tidal, derive their energy from the sun.
Solar technologies are broadly characterized as
either passive or active depending on the way they capture, convert and
distribute sunlight. Active solar techniques use photovoltaic panels, pumps,
and fans to convert sunlight into useful outputs. Passive solar techniques
include selecting materials with favorable thermal properties, designing spaces
that naturally circulate air, and referencing the position of a building to the
Sun. Active solar technologies increase the supply of energy and are considered
supply side technologies, while passive solar technologies reduce the need for
alternate resources and are generally considered demand side technologies.Applications :
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