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Scientists at Stanford University have created an "inverted solar cell" capable of capturing the heat emitted by the Earth during the night to generate electrical light.
Most solar panels generate electricity from the sun, through a physical process called photoelectric effect, in which a bright light on certain materials generates an electric current.
However, some use an alternative method, the temperature difference between the hot sun and the cold earth, to generate usable energy.
But the new machine fundamentally upsets this method, according to Gizmodo reports.
At night, the surface of the Earth is hotter than air, which means that the planet emits heat in a process called radiative cooling of the sky. The device exploits this heat exchange and turns it into electricity.
Although the energy produced by the radiative cooling of the sky is much lower than the energy obtained directly from the sun by the solar cells, it is sufficient to illuminate the LED bulb.
Scientists argue that this can help provide reliable power in off-grid areas around the world.
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An ingenious innovation that produces water and energy at a time!
"Much of the world's population still lacks electricity, especially at night when photovoltaic systems do not work.The ability to generate electricity at night can be essential for a wide range of people. applications, including lighting sensors, "wrote the research team. Low energy. "
The device has been manufactured with low-cost ready-to-use components, basic components and a cost of less than US $ 30. It consists of a polystyrene box covered with aluminum mylar, with a 200 mm black plated aluminum disk attached to the top, which serves as a heat emitter.
The heat flows from the ground into the air, through a small block of aluminum located under the box and into the disc, which emits heat into the air.
The test generated 25 milliwatts per square meter of disk, enough to run a small LED.
However, scientists say that with more insulation and a drier climate, they will have access to 0.5 watts per square meter of disc.
The device can also operate in the opposite direction during the day, absorbing sunlight and producing electricity from the heat transmitted by the sun to the disc.
The study was published on September 12 in the journal Joule.
Source: mirror
This article "An astonishing innovation generates electric light of darkness" is an adaptation of RT Arabic (Russia Today) and does not reflect in any way the policy or the point of view of the site. ).
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