Wind-powered vehicleWind-powered vehicles derive their power from sails, kites or rotors and ride on wheels—which may be linked to a wind-powered rotor—or runners. Whether powered by sail, kite or rotor, these vehicles share a common trait: As the vehicle increases in speed, the advancing airfoil encounters an increasing apparent wind at an angle of attack that is increasingly smaller. At the same time, such vehicles are subject to relatively low forward resistance, compared with traditional sailing craft.
CleanTechnicaCleanTechnica is a US-based website dedicated to aggregating news in clean technology, sustainable energy, and electric vehicles, with a focus on Tesla. CleanTechnica publishes stories on a wide range of topics that are cited by mainstream media such as Business Insider (on Lindsey Graham), Reuters (on nanotech for energy storage), ThinkProgress (on wind power in Texas), The Washington Post (on suburban living), Forbes (on the Byton M-Byte) and Slate (on mask stockpiling during the COVID-19 pandemic).
Gorlov helical turbineThe Gorlov helical turbine (GHT) is a water turbine evolved from the Darrieus turbine design by altering it to have helical blades/foils. Water turbines take kinetic energy and translates it into electricity. It was patented in a series of patents from September 19, 1995 to July 3, 2001 and won 2001 ASME Thomas A. Edison. GHT was invented by Alexander M. Gorlov, professor of Northeastern University.
Quietrevolution wind turbineQuietrevolution (often stylized with lower-case "q": quietrevolution) is a brand of vertical-axis wind turbines owned since 2014 by VWT Power in the United Kingdom. Quietrevolution's helical designs are related to the Gorlov turbine, which evolved from the Darrieus wind turbine. Quietrevolution's qr5 model won several awards, including Building magazine's 2006 Sustainable Innovation Award. However, the qr5 did not perform well enough to ensure the original company's success, and it went into administration in 2014.
Vertical-axis wind turbineA vertical-axis wind turbine (VAWT) is a type of wind turbine where the main rotor shaft is set transverse to the wind while the main components are located at the base of the turbine. This arrangement allows the generator and gearbox to be located close to the ground, facilitating service and repair. VAWTs do not need to be pointed into the wind, which removes the need for wind-sensing and orientation mechanisms. Major drawbacks for the early designs (Savonius, Darrieus and giromill) included the significant torque ripple during each revolution, and the large bending moments on the blades.
Health and environmental impact of the coal industryThe health and environmental impact of the coal industry includes issues such as land use, waste management, water and air pollution, caused by the coal mining, processing and the use of its products. In addition to atmospheric pollution, coal burning produces hundreds of millions of tons of solid waste products annually, including fly ash, bottom ash, and flue-gas desulfurization sludge, that contain mercury, uranium, thorium, arsenic, and other heavy metals.
Puissance crêteLa puissance crête est une grandeur physique qui mesure la puissance maximale, ou nominale, fournie par un dispositif. Son unité est le watt dans le Système international d'unités. Bien qu'une grandeur ne doive pas être confondue avec son unité, la puissance crête a parfois pour symbole non-SI, dans le langage courant, Wc (pour « watt-crête ») ou Wp (pour l'anglais « »).
Wind-turbine aerodynamicsThe primary application of wind turbines is to generate energy using the wind. Hence, the aerodynamics is a very important aspect of wind turbines. Like most machines, wind turbines come in many different types, all of them based on different energy extraction concepts. Though the details of the aerodynamics depend very much on the topology, some fundamental concepts apply to all turbines. Every topology has a maximum power for a given flow, and some topologies are better than others.
Net energy gainNet Energy Gain (NEG) is a concept used in energy economics that refers to the difference between the energy expended to harvest an energy source and the amount of energy gained from that harvest. The net energy gain, which can be expressed in joules, differs from the net financial gain that may result from the energy harvesting process, in that various sources of energy (e.g. natural gas, coal, etc.) can be priced differently for the same amount of energy.
