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The Sun is 93 million miles away. A tiny fraction of the Sun’s energy hits the Earth (~a hundredth of a millionth of a percent) is enough to meet all our power needs many times over. In fact, every minute, enough energy arrives at the Earth to meet our whole demands for a year. We call the energy from the sun, solar energy. Just the tiny fraction of the Sun’s energy that hits the Earth. Solar energy is transmitted to the earth in the form of radiant energy. It is vital to us because it provides the world—directly or indirectly– with almost all of its energy. In addition to providing the energy that sustains the world, solar energy is stored in fossil fuels and biomass, and is responsible for powering the water cycle and producing wind.
The four technologies employed to make use of solar energy are: Daylighting- the use of natural sunlight to brighten the building’s interior. Passive Solar Heating- takes advantage of Sun’s warmth and materials that absorb that warmth during the day/release it at night when heat is needed. Active Solar Heating- solar collectors concentrate the sun’s power on dark color plates that absorb heat. Air or liquid flows through tubes and warmed by the plates. Concentrating Solar Thermal- mirrors direct sunlight on one point. Water is turned into steam with this heat. The steam turns a turbine to create electricity. Photovoltaic(PV)- converts sunlight directly to electricity.
Langston High School in Arlington, VA and Caywood Elementary in Kentucky use daylighting to keep energy costs down.
Indirect Water Heater: The most common collector is called a flat-plate collector. Mounted on the roof, it consists of a thin, flat, rectangular box with a transparent cover that faces the sun. Small tubes run through the box and carry the fluid — either water or other fluid, such as an antifreeze solution — to be heated. The tubes are attached to an absorber plate, which is painted black to absorb the heat. As heat builds up in the collector, it heats the fluid passing through the tubes. Evacuated-tube collectors can achieve extremely high temperatures (170°F to 350°F), making them more appropriate for commercial and industrial application. However, evacuated-tube collectors are more expensive than flat-plate collectors, with unit area costs about twice that of flat-plate collectors. Evacuated tube collectors are usually made of parallel rows of transparent glass tubes. Each tube contains a glass outer tube and metal absorber tube attached to a fin. The fin is covered with a coating that absorbs solar energy well, but which inhibits radiative heat loss. Air is removed, or evacuated, from the space between the two glass tubes to form a vacuum, which eliminates conductive and convective heat loss. The storage tank then holds the hot liquid. It can be just a modified water heater, but it is usually larger and very well-insulated. Systems that use fluids other than water usually heat the water by passing it through a coil of tubing in the tank, which is full of hot fluid. Solar water heating systems can be either active or passive, but the most common are active systems. Active systems rely on pumps to move the liquid between the collector and the storage tank, while passive systems rely on gravity and the tendency for water to naturally circulate as it is heated. More information available at http://www1.eere.energy.gov/solar/sh_basics_water.html
A clean, large-scale solar thermal technology known as concentrating solar power is used in special power plants (Concentrating Solar Power or CSP plants) that use different kinds of mirror configurations to convert the sun&apos;s energy into high-temperature heat. The heat energy is then used to generate electricity in a steam generator.
World’s largest solar power tower in Seville, Spain. Solar power tower consists of a large field of sun tracking mirrors, called heliostats, which focus solar energy on a receiver atop of a centrally located tower. The enormous amount of energy, coming out of the suns rays, concentrated at one point (the tower in the middle) produces temperatures of approx. 550 C TO 1500 C. The gained thermal energy can be used for heating water or molten salt, which saves the energy for later use. Heated water gets to steam, which is used to move the turbine generator. This way thermal energy is converted into electricity.
This graphic shows how the power tower is used to heat molten salt which is used to heat water to produce steam to turn a turbine which produces electricity. Molten salt is used to transfer the heat because the heat can be stored and used when the sun is behind the clouds or at night.
Solar energy is the energy
received by the earth from the
sun. This energy is in the form of
solar radiation, which makes the
production of solar electricity
What is solar energy ?
Passive Solar Energy
Active Solar Energy
Photovoltaic Solar Power
Solar Thermal Energy
Concentrated Solar Power
Types of solar energy
Passive Solar Energy is a method in which solar
energy is harnessed in its direct form without
using any mechanical devices. Drying Clothes in
daylight is an example of using solar energy
Passive Solar Energy has a few applications
which all of us can use (where ever there is
Passive Solar Heating
Passive Solar Cooling
Passive solar energy
The Active Solar Energy employs mechanical or electrical
equipment for functioning and increase system efficiency. As
an example water pumps are used to circulate water through
the active solar energy water heating system.
Some Applications of Active Solar Energy which can be very
helpful to all of us.
Active Solar Water Heating
Active Solar Pool Heating
Active Solar Space Heating
Active solar energy
Solar Thermal Energy is the heat energy derived from the incident
solar energy (sunlight). This is used by Solar Heating Panels.
Yes, you guessed it right. Solar Thermal Energy does have advantages
like other forms of solar energy.
Solar Water Heating
Solar Pool Heating
Solar Space Heating
These are the common uses of Solar Thermal Energy. By taking
advantage of these you can get plenty of benefits. Electricity can be
generated using solar energy commonly this is known as
Solar Thermal Electricity
Solar thermal energy
The Energy generated by incident solar energy (light) into
electricity is termed as Photovoltaic Solar Power. This is done
using Photovoltaic Solar Cells.
Every one of us can get the benefits of the applications of
photovoltaic solar power.
Photovoltaic Solar Lighting
Concentrated Solar Power is a branch of Solar Thermal Energy which
is used to generate solar power electricity.
Electricity is produced on a large scale by using this technology. This
technology is not in either of our scope. But we can surely get its
benefits from a renewable energy supplier or green power from the
electricity supply company.
Knowing about the different solar energy types can be very helpful.
You can use this knowledge in order to decide in what way the solar
energy can be used for your advantage. Come what may you will
always get the benefit of any types of solar energy and help you
contribute to make this world a better place!
Concentrated solar energy
A solar power plant of the size 10–100 kW
depending on the load demand, is preferable
Particularly with a liberal subsidy to raise the
quality of life of the people subjected to
poverty in these areas.
Centralized power generation and distribution,
individual DLS (domestic lighting systems) are
also common in many rural unelectrified
Application of solar power
Heat Your Swimming Pool With Solar
Solar Energy Can Heat Your Water
Solar Energy For Battery Charging
Power Your Home With Solar Energy
Solar Energy For Cooking
Solar Energy for Indoor Lighting
Solar Energy Used For Outdoor Lighting
Uses of solar energy
o Passive Solar
o Active Solar Heating
o Concentrating Solar
o Photovoltaics (PV)
Solar World manufacturers solar panels
entirely in the USA from raw silicon to
completed solar panels. This process involves
four main steps: crystal growing, wafering,
solar cell production and solar panel assembly.
Solar cell production
Solar panel assembly
How solar panels are made ?
Costs for making solar panels
Component Cost per Unit (RS)
Solar Panel 150
Circuit Components 60
Printed Circuit Board 10
Total Manufacturing Cost per Lantern RS 400
Where are solar stations in India ?
All chemical and radioactive
polluting byproducts of the
thermonuclear reactions remain
behind on the sun, while only
pure radiant energy reaches the
Energy reaching the earth is
incredible. By one calculation,
30 days of sunshine striking the
Earth have the energy equivalent
of the total of all the planet’s
fossil fuels, both used and
Advantages of Solar Energy
Disadvantages of Solar Energy
• Sun does not shine consistently.
• Solar energy is a diffuse source.
To harness it, we must
concentrate it into an amount
and form that we can use, such
as heat and electricity.
• Addressed by approaching the
1) collection, 2) conversion, 3)