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Renewable Energy
- 1. Renewable energy By: Daniela Lima
- 2. • quot;Renewable energy is derived from natural processes that are replenished constantly. In its various forms, it derives directly from the sun, or from heat generated deep within the earth. Included in the definition is electricity and heat generated from solar, wind, ocean, hydropower, biomass, geothermal resources, and biofuels and hydrogen derived from renewable resources”
- 3. Intruduction • Solar energy is the radiant light and heat from the Sun that has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation along with secondary solar resources such as wind and wave power, hydroelectricity and biomass account for most of the available renewable energy on Earth. Only a minuscule fraction of the available solar energy is used. • Solar power technologies provide electrical generation by means of heat engines or photovoltaics. Once converted its uses are only limited by human ingenuity. A partial list of solar applications includes space heating and cooling through solar architecture, potable water via distillation and disinfection, day light, hot water, thermal energy for cooking, and high temperature process heat for industrial purposes.
- 4. Renewable energy Hydropower Solar Power Wind Power Geothermal Power Biomass
- 5. • Solar energy • Solar energy refers primarily to the use of solar radiation for practical ends. All other renewable energies other than geothermal derive their energy from the sun. • Solar technologies are broadly characterized as either passive or active depending on the way they capture, convert and distribute sunlight. Active solar techniques use photovoltaic panels, pumps, and fans to convert sunlight into useful outputs. Passive solar techniques include selecting materials with favorable thermal properties, designing spaces that naturally circulate air, and referencing the position of a building to the Sun. Active solar technologies increase the supply of energy and are considered supply side technologies, while passive solar technologies reduce the need for alternate resources and are generally considered demand side technologies
- 6. • Solar Energy Advantages • There is virtually an unlimited supply of solar energy • There is no cost involved with using solar power other that the cost of manufacturing the components • Solar energy is flexible and expandable • As our use of solar energy increases, our demand on fossil fuels decreases. • There is no pollution associated with the use of solar power. • Using solar energy is a silent process. • Solar Energy Disadvantages • Potentially large areas of land are required for large-scale solar energy projects. • Not many places in the world have enough constant and intense sunshine to make commercial use of solar energy practical. • If you live in a region where there is limited amounts of sunshine it may be difficult to maintain a constant supply of solar energy.
- 7. • Central de Serpa • The Serpa solar power plant was developed by the portuguese company Catavento and it incorporates photovoltaic modules from Sun power, Sanyo, Sharp and Suntech. General electricFinancial Services provided the financing for the project as part of its Ecomagination program. • Generating electricity from the sun with no fuel costs or emissions, the Serpa plant is on a 60-hectare (150-acre) hillside and is a model of clean power generation integrated with agriculture. The project supports a European Union initiative by saving more than 30,000 tons a year in greenhouse gas emissions compared to equivalent fossil fuel generation. The EU agreed to cut greenhouse gas emissions by at least 20 percent by 2020, from 1990 levels. • Portugal relies heavily on imported fossil fuels, and its carbon dioxide emissions have increased 34 percent since 1990, which is among the fastest rates in the world. To address this, the country is implementing some of the world's most advanced incentives for installing renewable energy.
- 8. Conclusion • We use energy every day. It surrounds us in different forms, such as light, heat, and electricity. Our bodies use the energy stored in molecues of substances like carbohydrates and protein to move, breathe, grow, and think. We also use energy to do work and to play. Humans have invented thousands of machines and appliances that use energy to make our work easier, to heat our homes, and to get ourselves from place to place. Some of these machines use electricity, while others, like automobiles, use the energy stored in substances such as gasoline. The two most common forms of energy we use are heat and electricity. Heat is the energy of moving particles in any substance. The faster the particles move, the warmer the substance is. Electricity is the energy of electrons moving along a conductor like a copper electrical wire.