Solar Energy
Ever since the dawn of time, the sun has
been a resource we cannot live or do
without, so its not such a shock that
man has come up with the idea of solar
energy. Solar energy had many uses.
Some can be dangerous and some, a very
valuable asset to the modern world.
Solar energy is energy derived from the sun
in a form of ultra-violet rays.
Its was first applied to use in 212 B.C., by the
Greek genius Archimedes.
Solar energy was used to defend the habor of Syracuse
against the Roman
fleet. Archimedes used a mirror or "burning mirror" as
they had called it, to
set fire to the ships of the Roman fleets while standing
on shore (McDaniels
83). It wasn’t until 1615 when Salomon de Caux constructed
the first solar
device; a solar engine. His device was made of glass lenses,
supporting
frame, and an airtight metal vessel containing water and air. This
produced a
small water fountain when the air heated up during operation. This
was
considered to be more of a toy than a device, but it was the first
published
account of the use of solar energy since the fall of the Roman
Empire (Cheremisinoff
1). Some other use of solar energy after that was
the solar roof and the solar
oven. The solar roof was thought up by Harold
Hay. In a solar roof system, water
is contained in a clear plastic bag and it
is placed on a black metal roof. Hay
got the idea while traveling in India on
a technical aid mission for the U.S
government. While there, he noticed that
many people were living in rusty, sheet
metal shacks, which were hot in the
day and cold at night. Hay’s plan was to
remove the insulation from the roof
on winter days so that the roof would get
hot, and Replacing the insulation
at night to allow the shack to be warm through
the night. Then in the summer,
he would so the reverse of what he did in winter
to let the house cool at
night and replacing the insulation in the daytime to
block out the heat. Then
over the years, Hay and a man named John Yellott
constructed a 3- by 3.7-m
building using water basins as the actual roofing
material. During the
summer, a slab of foam insulation was rolled back at night,
and the water
would become cold through the night sky evaporation. Since the
water supply
sat directly on a metal ceiling, it absorbed the heat from the room
and kept
the building air-conditioned all day. During the winter, the
movable
insulation was rolled back in the daytime which allowed for it to
collect heat.
This generated enough heat into the house through the
ceiling at night to keep
the room comfortable (McDaniels 179-181). Then there
was the solar cooker.
Developed by Augustin Mouchot in France and by John
Ericsson in the United
States in the nineteenth century. They wanted to
develop a solar cooker that not
only reached high temperatures, but also was
to be used as a means of heat
storage enabling food to be cooked after
sundown. Mouchot built a solar steam
engine that operated a printing press in
Paris in 1882. In the United States,
John Ericsson invented what he
called the "Ericsson-cycle" which was a
hot-air engine for the making of
solar heat. The sun’s rays would be
concentrated with the use of a parabolic
reflector, which was designed to track
the sun across the sky in order to
keep a constant power output. (McPhillips
86-89) There was also the solar
oven. In 1837, and astronomer from England named
John Fredrick Herschel
introduced to the world a solar oven. He built a small
solar oven while on a
trip to Africa’s Cape of Good Hope. He constructed it as
a mahogany, painted
it black and buried it in the sand for purposes of
insulation. a
doubled-glazed cover, which was the only portion of the oven left
exposed,
serve to limit heat losses through the top, while at the same time,
letting
in sunlight. The maximum temperature of the oven was of about 240
degree
F and it was used throughout his expedition by him and his staff
to cook both
meat and vegetables (Regino 5). Not all solar energy inventions
and discoveries
were good. Some solar energy is dangerous. One for example
would be lasers.
Laser, an electromagnetic wave that is made up of
excited atoms. It produces
coherent light. This means that the light produced
is orderly, with all the
excited atoms making up the laser beam that is
emitting their flashes in unison.
The laser often consist of polished
ruby rod that has a solid mirror at one end,
and a high voltage flash tube
wound around the rod. The flash tube acts as the
power source for the laser
beam and the energy that is emitted as pulse is
visible light (Holsroemn
12-14). Another dangerous solar energy is Ultra-violet
rays. Ultra-violet
rays is also referred to as UV rays for short. They are
energy rays that is
given off from the sun. UV rays were first discovered by
astronomers in the
1960’s. It can be dangerous because too much rays can cause
you to sun burn,
tan, damages your hair, and at the worst; skin cancer. You can
get skin
cancer if your are not careful about how to spend and protect yourself
from
the sun. One way to protect yourself is by applying sun tan lotion to
your
skin every time that you plan on spending a lot of time in the sun,
especially
if you are going to the beach. To be on the safe side for sure,
you should apply
it everytime you are in the sun. (Rose 123-125). There is
basically a lot of
solar powered inventions in our society today. Like in our
household, there are
many solar equipment. There is the solar heating, solar
satellite, solar water
heating, solar cooling, solar radio, solar battery,
etc. As you can see, there
are so many solar items in the world so solar is
an important source. (Holstroemn
182). We believe that solar energy is
worth it. It is a good thing that our
planet has so many ways of generating
energy. We have electricity, solar power,
nuclear power, propane, so many! We
think that out of all the choice of energy,
we prefer solar. Why you ask,
because think of what will happen when we lose all
of our other source of
energy. The sun is always here for us. Solar energy is
the only energy source
that can not be controlled. We could lose all of our
electricity and still
live because we can live off of solar power. You don’t
need electricity or
gas to power your stove because when there is a storm, the
power can be
knocked out and you wouldn’t have to worry if you have furniture
that were
powered by solar. Every other power source can be destroyed but the
greatest
power of all is the sun. This is one power source that can always be
depended
on. The best part about solar energy is that it is free. It can last
forever.
In a poll that we had conducted around our neighborhood, we found that
only
five percent of the people on our street have solar powered products. This
is
very surprising to me. We had expected the average to be somewhat
higher.
Mrs. Richard is one of the person who we asked that had solar
products such as:
solar battery and solar heating. She believes that everyone
should at least give
solar products a try because you can always depend on it
when you need it. Other
people like Mr. Pham said that there is no use to
solar power because when the
sky is cloudy, there is no sun to power any of
the solar product. He prefers to
stick to electricity. People have different
ways of looking at solar energy so
its up to them if they want sun energy or
electricity. Who knows, maybe one day,
everyone will agree on using solar
energy. As for us, we still prefer solar over
electricity any
day.
Bibliography
Cheremisinoff, Pual N. Principles &
Applications Of Solar Energy. Ann
Arbor Science Publishers: Michigan,
1979. Holstroemn, Isaac R. Energy From The
Sun. Tab Books, Inc:
Pennsylvania, 1981. McDaniels, David K. The Sun. John Wiley
& Sons, Inc:
Canada, 1984. McPhillips, Martin. The Solar Energy. Everest
House: New
Yrok, 1983. Regino, Thomas C. Solar Energy. St. Martin’s Press,
Inc: New
Yrok, 1986. Rose, Harvey. Solar Energy Now. Ann Arbor
Science
Publishers:1982.