Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Heliostat> ?p ?o }
- Heliostat abstract "A heliostat (from helios, the Greek word for sun, and stat, as in stationary) is a device that includes a mirror, usually a plane mirror, which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the sun's apparent motions in the sky. The target may be a physical object, distant from the heliostat, or a direction in space. To do this, the reflective surface of the mirror is kept perpendicular to the bisector of the angle between the directions of the sun and the target as seen from the mirror. In almost every case, the target is stationary relative to the heliostat, so the light is reflected in a fixed direction. According to contemporary sources the heliostata, as it was called at first, was invented by Willem 's Gravesande (1688-1742). Other contenders are Giovanni Alonso Borelli (1608-1679) and Daniel Gabriel Fahrenheit (1686-1736).Nowadays, most heliostats are used for daylighting or for the production of concentrated solar power, usually to generate electricity. They are also sometimes used in solar cooking. A few are used experimentally, or to reflect motionless beams of sunlight into solar telescopes. Before the availability of lasers and other electric lights, heliostats were widely used to produce intense, stationary beams of light for scientific and other purposes.Most modern heliostats are controlled by computers. The computer is given the latitude and longitude of the heliostat's position on the earth and the time and date. From these, using astronomical theory, it calculates the direction of the sun as seen from the mirror, e.g. its compass bearing and angle of elevation. Then, given the direction of the target, the computer calculates the direction of the required angle-bisector, and sends control signals to motors, often stepper motors, so they turn the mirror to the correct alignment. This sequence of operations is repeated frequently to keep the mirror properly oriented.Large installations such as solar-thermal power stations include fields of heliostats comprising many mirrors. Usually, all the mirrors in such a field are controlled by a single computer.There are older types of heliostat which do not use computers, including ones that are partly or wholly operated by hand or by clockwork, or are controlled by light-sensors. These are now quite rare.Heliostats should be distinguished from solar trackers or sun-trackers that point directly at the sun in the sky. However, some older types of heliostat incorporate solar trackers, together with additional components to bisect the sun-mirror-target angle.A siderostat is a similar device which is designed to follow a fainter star, rather than the sun.".
- Heliostat thumbnail Ekling_Heliostat.JPG?width=300.
- Heliostat wikiPageExternalLink tiki-index.php?page=Sunalign.
- Heliostat wikiPageExternalLink 41428.pdf.
- Heliostat wikiPageExternalLink eng-concentrateur1.htm.
- Heliostat wikiPageExternalLink eng-lesfours1.htm.
- Heliostat wikiPageID "1024214".
- Heliostat wikiPageLength "16443".
- Heliostat wikiPageOutDegree "54".
- Heliostat wikiPageRevisionID "679392824".
- Heliostat wikiPageWikiLink Absorption_refrigerator.
- Heliostat wikiPageWikiLink Albedo.
- Heliostat wikiPageWikiLink Altazimuth_mount.
- Heliostat wikiPageWikiLink Angle.
- Heliostat wikiPageWikiLink Astronomy.
- Heliostat wikiPageWikiLink Bisection.
- Heliostat wikiPageWikiLink Category:Solar_energy.
- Heliostat wikiPageWikiLink Celestial_pole.
- Heliostat wikiPageWikiLink Clockwork.
- Heliostat wikiPageWikiLink Concentrated_solar_power.
- Heliostat wikiPageWikiLink Control_theory.
- Heliostat wikiPageWikiLink Curved_mirror.
- Heliostat wikiPageWikiLink Daniel_Gabriel_Fahrenheit.
- Heliostat wikiPageWikiLink Daylighting.
- Heliostat wikiPageWikiLink Declination.
- Heliostat wikiPageWikiLink Electric_motor.
- Heliostat wikiPageWikiLink Equation_of_time.
- Heliostat wikiPageWikiLink Font-Romeu-Odeillo-Via.
- Heliostat wikiPageWikiLink Heliograph.
- Heliostat wikiPageWikiLink Helios.
- Heliostat wikiPageWikiLink Laser.
- Heliostat wikiPageWikiLink Latitude.
- Heliostat wikiPageWikiLink Longitude.
- Heliostat wikiPageWikiLink Nuclear_power.
- Heliostat wikiPageWikiLink PS10_solar_power_plant.
- Heliostat wikiPageWikiLink Perpendicular.
- Heliostat wikiPageWikiLink Plane_mirror.
- Heliostat wikiPageWikiLink Polar_alignment.
- Heliostat wikiPageWikiLink Renewable_energy.
- Heliostat wikiPageWikiLink Sensor.
- Heliostat wikiPageWikiLink Solar_cell.
- Heliostat wikiPageWikiLink Solar_cooker.
- Heliostat wikiPageWikiLink Solar_energy.
- Heliostat wikiPageWikiLink Solar_furnace.
- Heliostat wikiPageWikiLink Solar_telescope.
- Heliostat wikiPageWikiLink Solar_thermal_energy.
- Heliostat wikiPageWikiLink Solar_tracker.
- Heliostat wikiPageWikiLink Star.
- Heliostat wikiPageWikiLink Stepper_motor.
- Heliostat wikiPageWikiLink The_Solar_Project.
- Heliostat wikiPageWikiLink Willem_s_Gravesande.
- Heliostat wikiPageWikiLink File:Ekling_Heliostat.JPG.
- Heliostat wikiPageWikiLink File:Font_Romeu_France.jpg.
- Heliostat wikiPageWikiLink File:Heliostat.jpg.
- Heliostat wikiPageWikiLink File:PS10_solar_power_tower_2.jpg.
- Heliostat wikiPageWikiLink File:Solar_two.jpg.
- Heliostat wikiPageWikiLinkText "Heliostat".
- Heliostat wikiPageWikiLinkText "heliostat mirror".
- Heliostat wikiPageWikiLinkText "heliostat".
- Heliostat wikiPageWikiLinkText "heliostats".
- Heliostat wikiPageWikiLinkText "siderostat".
- Heliostat wikiPageUsesTemplate Template:About.
- Heliostat wikiPageUsesTemplate Template:Convert.
- Heliostat wikiPageUsesTemplate Template:Portal.
- Heliostat wikiPageUsesTemplate Template:Refimprove.
- Heliostat wikiPageUsesTemplate Template:Reflist.
- Heliostat subject Category:Solar_energy.
- Heliostat hypernym Device.
- Heliostat type Device.
- Heliostat type Application.
- Heliostat type Element.
- Heliostat type Redirect.
- Heliostat type Source.
- Heliostat comment "A heliostat (from helios, the Greek word for sun, and stat, as in stationary) is a device that includes a mirror, usually a plane mirror, which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the sun's apparent motions in the sky. The target may be a physical object, distant from the heliostat, or a direction in space.".
- Heliostat label "Heliostat".
- Heliostat sameAs Q1347279.
- Heliostat sameAs Heliòstat.
- Heliostat sameAs Category:Heliostats.
- Heliostat sameAs Heliostat.
- Heliostat sameAs Heliostato.
- Heliostat sameAs Heliostaat.
- Heliostat sameAs خورپا.
- Heliostat sameAs Heliostaatti.
- Heliostat sameAs Héliostat.
- Heliostat sameAs Héileastat.
- Heliostat sameAs הליוסטט.
- Heliostat sameAs Eliostato.
- Heliostat sameAs Heliostat.
- Heliostat sameAs हेलिओस्टॅट.
- Heliostat sameAs Heliostaat.
- Heliostat sameAs Solspeil.
- Heliostat sameAs Heliostat.
- Heliostat sameAs m.03_7by.
- Heliostat sameAs Гелиостат.
- Heliostat sameAs Heliostat.
- Heliostat sameAs Heliostat.
- Heliostat sameAs Геліостат.
- Heliostat sameAs Q1347279.
- Heliostat wasDerivedFrom Heliostat?oldid=679392824.
- Heliostat depiction Ekling_Heliostat.JPG.