Everything about Heliostat totally explained
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Heliostat (from
helios, the Greek word for
sun, and
stat, as in stationary) is a device that tracks the movement of the
sun. It is typically used to orient a
mirror, throughout the day, to redirect sunlight along a fixed axis towards a stationary target or receiver.
Heliostats are used in
solar telescopes, and
solar power generation. Heliostats have been used in
surveying in the form of a
heliotrope to constantly reflect sunlight in a single fixed direction, allowing the accurate observation of a known point from a distance.
The simplest heliostat devices use an
equatorial mount and a clockwork mechanism to turn the mirror in synchronisation with the rotation of the Earth. More advanced heliostats track the sun directly by sensing its position throughout the day.
A
siderostat is a similar device which is designed to track a fainter
star, rather than the Sun.
Large scale projects
Many heliostats can be combined together to concentrate the sun's energy. Energy can be collected for electrical generation with
photovoltaic cells or can be used to heat a medium such as water or molten salt, as in the
The Solar Project. The high temperatures can also be used as an incinerator for waste disposal.
Further Information
Get more info on 'Heliostat'.
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