Abstract :
Solar energy
is the energy produced directly by the sun and collected elsewhere, normally
the Earth. The sun creates its energy through a thermonuclear process . The process
creates heat and electromagnetic radiation.
Only a very
small fraction of the total radiation produced reaches the Earth. The radiation
that does reaches the Earth is the indirect
source of nearly every type of energy used today.
. The radiation
that does reach the Earth is the indirect source of nearly every type of energy
used today. The exceptions are geothermal energy, and nuclear fission and fusion.
Even fossil fuels owe their origins to the sun; they were once living plants
and animals whose life was dependent upon the sun.
Much of the
world's required energy can be supplied directly by solar power. More still can
be provided indirectly. The practicality of doing so will be examined, as well as
the
benefits
and drawbacks. In addition, the uses solar energy is currently applied to will
be noted.
Due to the nature
of solar energy, two components are required to have a functional solar energy generator.
These two components are a collector and a storage unit. The collector simply collects
the radiation that falls on it and converts a fraction of it to other forms of energy
(either electricity and heat or heat alone). The storage unit is required because
of the non-constant nature of solar energy; at certain times only a very small amount
of radiation
will be received. At night or during heavy cloudcover, for example, the amount of
energy produced by the collector will be quite small. The storage unit can hold
the excess energy produced during the periods of maximum productivity, and release
it when the productivity drops. In practice, a backup power supply is usually added,
too, for the situations when the amount of energy required is greater than both
what is being produced and what is stored in the container
PRINCIPLE OF
PV CELL
Solar cell works on the principle of
photovoltaic effect. Sunlight is composed of photons, or "packets “of energy.
These photons contain various amounts of energy corresponding to the different
wavelengths of light. When photons strike a solar cell, they may be reflected
or absorbed. When a photon is absorbed, the energy of the photon is transferred
to an electron in an atom of the cell (which is actually a semiconductor). With
its new found energy, the electron is able to escape from itsnormal position associated
with that atom to become part of the current in an electric
SOLAR MOBILE
CHARGER UNIT
Portable Solar Mobile Charger for mobile
phone can be charged with Sun light and electrical power. It stores power from
the sun and charge mobile phone,iPod,etc.
Solar cell phone chargers use solar panels
to charge cell phone batteries. They are an alternative to conventional electrical
cell phone chargers and in some cases can be plugged into an electrical outlet.
There are also public solar chargers for
mobile phones which can be installed permanently in public places such as streets,
park and squares.
The model which is according to European
Commission proclaimed as the first in the world is the Strawberry Tree, public solar
charger invented by Strawberry energy Company. This solar station won the first
place at "EU Sustainable energy week (EUSEW) 2011" in the Consuming category.
Some models of cell phones have a built
in solar charger and are commercially available for GSM cellphone models.
Solar cell phone chargers come in different
shapes and configurations including folding and rotating types.
Download :
Download :