2.3.4 How Does a Solar PV Works? The word photovoltaic is a combination of two words ‘photo’ which has a meaning of light and ‘voltaics’ meaning electricity. So‚ the scientific terminology photovoltaic technology describes to the use solar energy for the production of EPIA (2006). Figure 2. Diagram that shows how a solar PV works. The diagram above illustrates the operation of a basic photovoltaic cell‚ also called a solar cell. Solar cells are made of the same kinds of semiconductor materials
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the case of realistic profiles it is the distance at which the Concentration of the diffusing atoms drops to a characteristic lower value. For example，about 0.3 for a Gaussian concentration profile. A2.5 For commercially produced screen-printed solar cells‚ the surface doping concentration is about 1×10!" ~1×10!" ������������������������������/������������! . It is nearly the solid solubility of phosphorus in silicon substrate. On the other
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2.5 Aspects of Solar Cell Efficiency Most of the energy that reaches a cell in the form of sunlight is lost before it is converted to electricity. The usual efficiency of these systems ranges between 10% to 15%‚ though sometimes this efficiency increases to 30% and more. Certain physical properties affect the cell efficiency which we will briefly state. 1- Reflection: Studies show that untreated silicon reflects 36% or more of sunlight that strikes it. Chemically coating and texturing the surface
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draws its energy needs from a variety of sources. We broadly classified this source as conventional and non conventional. 1.1] CONVENTIONAL SOURCES 1) Fossil fuels‚ 2) Hydroelectric power‚ 3) Nuclear fission‚ 1.2] NON-CONVENTIONAL SOURCES 1) Solar energy‚ 2) Wind energy‚ 3) Bio mass and bio gas‚ 4) Ocean thermal energy‚ 5) Tidal energy‚ 6) Geothermal energy. Energy is the prime mover of economic growth and is vital to the survival of a modern economy. Future economic growth crucially depends
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Approximately 557 Earth years is equal to 1 Eris year. Eris has a diameter between 2‚400 and 3‚000 km. Eris plays a big part in our Solar System and is important to us because it is the largest object and the largest dwarf planet to be found orbiting the sun since 1846‚ when Neptune and its moon Triton was discovered. In conclusion‚ Eris is the 10th planet in our solar system and is rocky unlike many planets before it. References: • Dwarf Planets; UB313 or Eris http://sse.jpl.nasa.gov/planets/profile
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Earth and universe Dr.Latifa AL-Naimi 1 Earth Earth ‚ our home planet‚ is beautiful blue and white ball when seen from space. Science is the study of the Earth and its neighbors in space. It is an exciting science with many interesting and practical applications. Some Earth scientists use their knowledge of the Earth to locate and develop energy and mineral resources. Dr.Latifa AL-Naimi 2 Others study the impact of human activity on Earth’s environment and design methods
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org/wiki/List_of_concentrating_solar_thermal_power_companies http://energybusinessdaily.com/power/using-taconite-for-solar-thermal-storage/ Solar thermal energy From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search | The examples and perspective in this article may not represent a worldwide view of the subject. Please improve this article and discuss the issue on the talk page. (May 2010) | Solar thermal system for water heating in Santorini‚ Greece. | Sustainable energy | Renewable energy
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Why Do We Need Solar Energy? With the world’s natural resources depleting rapidly‚ humans must find a way to compensate. This society has milked oil‚ coal‚ gasoline‚ lead‚ uranium‚ and many other of these reservoirs in our Earth for hundreds of years and much has been done. Asphalt was used for our roads and highways‚ coal was originally used for heat before there was oil‚ and even water was used as a form of electricity on many rural farms. Luckily‚ more companies around the world are waking
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The earth receives extremely large amounts of energy coming from the sun. Solar energy has become a number one option for a future reliable‚ greener energy source. An article by the National Academy of Engineering‚ Make Solar Energy Economical‚ has proposed this issue as one of the many challenges engineers face this 21st century. The academy emphasizes‚ the sun’s “availability far exceeds any conceivable future energy demands. It is environmentally clean‚ and its energy is transmitted from the sun
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or I should say my heroes - EXO. EXO is a music band from Korea and China; there are 12 members‚ which are separated into two subgroups‚ EXO-K and EXO-M. Their name was taken from the word ’exoplanet’‚ a term referring to planets outside of the solar system. In their music video‚ each of them has a special ability‚ such as ice‚ which can freeze everything; healing ability; teleportation; flying as a dragon; mind control and so on. I think they are heroes because they are not only good at singing
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