Solar collectors. Solar ovens and concentrators. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Solar collectors. Solar ovens and concentrators. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Alternative energy sources

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There are other inexpensive technologically simple solar collectors for a narrow purpose - solar ovens (for cooking) and solar distillers, which allow you to get distilled water cheaply from almost any source.

Solar ovens are cheap and easy to make. They consist of a spacious, well-insulated box lined with a reflective material (such as foil), covered with glass and equipped with an external reflector. The black pan serves as an absorbent, heating up faster than regular aluminum or stainless steel cookware. Solar ovens can be used to disinfect water by bringing it to a boil.

Solar stills provide cheap distilled water, even salty or heavily polluted water can be used as a source. They are based on the principle of evaporation of water from an open container. The solar distiller uses the sun's energy to speed up this process. It consists of a dark-colored heat-insulated container with glazing, which is tilted so that the condensed fresh water flows into a special container. A small solar distiller - about the size of a kitchen stove - can produce up to ten liters of distilled water on a sunny day.

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Controlling lightning with a laser 18.11.2020

By directing the lightning with a laser beam, the energy stored in the thundercloud can be discharged where it will cause less harm.

Physicists from universities in Australia and the United States have demonstrated technology that allows you to control the trajectory of lightning using a laser beam.

The researchers simulated in the laboratory atmospheric conditions similar to those observed during a thunderstorm. In nature, lightning follows the path of least resistance. It can be created artificially - for this, scientists used conductive microparticles of graphene. When heated, they cause ionization of neighboring air particles and create a path for a stepped lightning leader.

By directing the lightning with a laser beam, the energy stored in the thundercloud can be discharged where it will cause less harm. This means avoiding human casualties and forest fires, like those that hit Australia in August 2019.

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