Generate electricity from the dark

A research team was able to generate enough electricity to power the LED lamp using equipment valued at $ 30, thanks to night-time cooling.
What he called "generating electricity from the dark". "The amount of energy coming from the sun should be about equal to that coming out of the earth in the form of heat radiation," said author Shanhui Fan, professor of electrical engineering at Stanford.
In the study, the researchers pointed out that 1.3 billion people in the world did not have access to electricity and that batteries, which produce electricity at night in from solar panels, were expensive, which led them to invent a way to produce electricity at night.
Solar panels usually generate electricity from the sun through a physical process called photoelectric effect, while others operate through thermal processes, in which the sun is no longer hot and the earth colder. This difference in temperature can be converted into usable energy. The mission of the researchers has come.
The innovation consists of a 20 cm (8 inch) black plated aluminum disc, connected to thermal generators, emitting radiation, generally colder by several degrees of ambient air.
The process takes place through a heat flux from the soil to the air, then air through thermal generators, and then to the disc that emits heat.