Wind turbine installation

Wind power refers to the kinetic energy stored in wind, and it's extraction using wind turbines. This article deals mainly with the intricacies of large scale deployment of wind turbines to generate electricity. See wind turbine for more on individual turbines. Wind Turbine As a general rule, wind generators are practical where the average wind speed is greater than 20 km/h (5.5 m/s). Obviously, meteorology plays an important part in determining possible locations for wind parks, though it has great accuracy limitations....

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How Does Wave Energy Work?

Wave power is a method of electrical generation, where energy from waves moving in water is transferred into an electrical current; the electricity thus produced is coined asrenewable energy. Wave power generation is not a widely employed technology with only a few experimental sites in existence. Wave power has however an advantage in comparition with many other renewable energy sources, because of it's stability in production. Where for instance the amount of wind power being produced relies heavily on how strong winds there are locally, which fluctuates heavily from day to day and from season...

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Water turbine - Types of Turbine

Water Turbine Water turbine - Types of Turbine Water is very heavy and its flow energetic. The Power available in flowing water is described by; where: •  Power( Joules/sec or Watts) •  turbine efficiency •  density of water (Kg/meter3) •  accelaration of gravity (9.8 meters/sec2) •  head (meters, this is the height at which still, unimpeded water starts falling from) •  flow rate (meters3/sec) Theory of operation Water turbines are divided into two groups; reaction turbines and impulse turbines. Impulse turbines change the direction of flow of the water,...

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Solar water heating

Using the sun to heat water A collector is placed on or forms the roof of a building, or on a wall facing the sun, or may be free-standing. The working fluid is either pumped or driven by convection through it. Active control or simple physics ensures it only moves when a net gain in heat will occur. The collector can be a simple glass topped box with copper pipes in it, or a set of metal tubes surrounded by a evacuated (near vacuum) glass cylinder. A parabolic mirror can also be added to concentrate the sun's light on the tube. A simple water heating system would pump cold water out to a collector...

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What is sea level rise?

Sea level rise, a phenomena sometimes held to be caused by global warming and thus evidence supporting the Global Warming Theory. Rising atmosphere temperature theoretically is causing the ice caps to melt and the oceans to expand (heat does cause ice to melt and water to expand). On the other hand, heat also causes water to evaporate, so it is not known what effect global warming will have on sea level. Some researchers believe that rising average sea levels are proof of the global warming theory and that likely further global warming will cause additional sea level rise, possibly wiping out shore-based communities. Other researchers believe that rising average sea levels are...

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Renewable energy

Renewable energy is any type of energy generation that isn't dependent on a limited resource like fossil fuels. Renewable energy may be used directly, such as solar ovens, geothermal heat pumps, or windmills. Other forms of renewable energy sources generate electricity, such as solar power cells, wind generators, tidal waves and hydroelectricpower. Still other forms generate fuels, such as vegetable oils generated from biomass. Most renewable energy can trace their root to solar energy, perhaps with the exception of geothermal and tidal wave power. For example, wind is caused by the density difference of the air when the sun heats various parts of the earth unevenly. Hydroelectric...

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Photovoltaic energy systems definition

Photovoltaics is the direct conversion of radiant energy such as sunlight into electricity through quantum mechanical processes. Photovoltaics is also known as 'solar electric power' or 'solar power', though the latter term fails to adequately distinguish photovoltaics from other technologies that make use of solar energy, such as solar hot water, or solar thermal electricity generation. The photovoltaic effect - the process by which sunlight is converted to electricity - was first noted by Edmund Becquerel in 1839. The principle component of a photovoltaic system is the photovoltaic cell, or...

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