Solar Energy class 6 7 Above
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This document summarizes different types of solar energy technologies including passive solar, active solar, photovoltaics, solar thermal, and concentrated solar power. It describes how passive solar harnesses sunlight without devices while active solar uses equipment like pumps. Photovoltaics involve growing silicon crystals, cutting wafers, producing solar cells, and assembling panels. Concentrated solar power uses towers to focus sunlight and generate heat for power production. The document notes solar energy's advantages of being pollution-free but also its disadvantages like inconsistent sunlight availability which can be addressed through collection, conversion, and storage technologies.
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Solar Energy class 6 7 Above
- 1. SOLARSOLAR ENERGYENERGY Sehajpreet SinghSehajpreet Singh Class : VI-BClass : VI-B
- 2. 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 possible. What is solar energy ? Passive Solar Energy Active Solar Energy Photovoltaic Solar Power Solar Thermal Energy Concentrated Solar Power Types of Solar Energy
- 3. 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 passively. Passive Solar Energy has a few applications which all of us can use (where ever there is sunlight). Daylighting Passive Solar Heating Passive Solar Cooling Passive Solar Energy
- 4. 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 SolarWater Heating Active Solar Pool Heating Active Solar Space Heating Active Solar Energy
- 5. Solar Technologies Daylighting Passive Solar Heating Active Solar Heating Concentrating Solar Thermal Photovoltaics (PV)
- 6. SolarWorld 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. Crystal growing Wafering Solar cell production Solar panel assembly How Solar Panels are made ?
- 7. Daylighting
- 8. Active Solar Heating Flat Plate Collector Evacuated Tube Collector
- 10. PowerTower
- 12. All chemical and radioactive polluting byproducts of the thermonuclear reactions remain behind on the sun, while only pure radiant energy reaches the Earth. 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 unused! Advantages of Solar Energy
- 13. 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 problem through: Collection Conversion Storage.
- 14. Thank you
Editor's Notes
- 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'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.