Every I think that we should get better technology

Every
day, the sun radiates an enormous amount of energy. It radiates more energy in
one day than the world uses in one year! Then why are people not harnessing
this renewable source of energy for heating and cooling their homes? I think
that we should get better technology to use this energy as it is has a fairly
high net energy yield, it works on cloudy days, there is a quick installation,
it is easily expanded and removed, and it has no CO2 emissions and
no environmental impact. It also has very little land use and it reduces
human’s impact on nonrenewable fossil fuels. It can be used to heat homes and
produce electricity.

A
passive solar home is designed to let in as much sunlight as possible. A
passive solar heating system absorbs and stores heat from the sun directly
within a well-insulated structure without the need for pumps or fans to
distribute the heat. Energy-efficient windows or attached greenhouses face the
sun to collect solar energy directly. Walls and floors of concrete, adobe,
brick, stone, or salt-treated timber, and metal or plastic water tanks can
store much of the collected solar energy as heat and release it slowly
throughout the day and night. A small backup heating system such as a vented
natural gas or propane heater may be used, but is not necessary in many
climates. This is very efficient when you are building a new home because the
heating is essentially free.

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An
active solar home, on the other hand, uses special equipment to collect
sunlight. An active solar house may use special collectors that look like boxes
covered with glass. These collectors are mounted on the rooftop facing south to
take advantage of the winter sun. Dark-colored metal plates inside the boxes
absorb sunlight and change it into heat. (Black absorbs sunlight better than
any other color.) Air or water flows through the collectors and is warmed by
the heat. The warm air or water is distributed to the house, just as it would
be with an ordinary furnace system. An active solar heating system absorbs
energy from the sun by pumping a heat-absorbing fluid through special
collectors usually mounted on a roof or on special racks to face the sun. Some
of the collected heat can be used directly. The rest can be stored in a large
insulated container filled with gravel, water, clay, or a heat-absorbing
chemical for release as needed. They can be used to heat new homes in areas
with adequate sunlight. But solar energy cannot be used to heat existing homes
and buildings that are not oriented to receive sunlight or that are blocked
from sunlight by other buildings or trees. I think that this is a very
important concept as there are so many homes already built, and if they happen
to have adequate sunlight, they can switch their energy source to solar.

Solar
energy can be converted directly into electrical energy by photovoltaic (PV)
cells, commonly called solar. Most solar cells are thin wafers of purified
silicon with trace amounts of metals that allow them to function as
semiconductors to produce electricity. When sunlight strikes these transparent
cells, they emit electrons, and many cells wired together in a panel can
produce electrical power. The cells can be connected to existing electrical
grid systems or to batteries that store the electrical energy until it is
needed. Some countries require power companies to pay homeowners and businesses
for any excess electrical energy that they produce and feed back into the grid
system. The semiconductor material used in solar cells can be made into
paper-thin rigid or flexible sheets that can be incorporated into
traditional-looking roofing materials and attached to walls, windows, and
clothing.

Solar
energy has great potential for the future. Solar energy is free, and its
supplies are unlimited. It does not pollute or otherwise damage the
environment. It cannot be controlled by any one nation or industry. If we can
improve the technology to harness the sun’s enormous power, we may never face
energy shortages again.

The
high cost of using solar cells to produce electricity is the key problem. Solar
energy is one of the most expensive types of sources for energy. Still, using
solar cells is cheaper than building centralized power plants and electric
transmission grids in areas of developing countries that currently have little
or no electricity.

In conclusion, I think that solar energy is the
best source of energy because it has no moving parts, are safe and quiet,
require little maintenance, produce no pollution or greenhouse gases during
operation, and last as long as a conventional fossil fuel or nuclear power
plant. So, there are many advantages to solar energy, and, if people could
harness that energy more efficiently, we could get solar as our number one
contributor for our energy in the 21st ce