UCLA makes real "dark photovoltaics" — Old tech from 1821 produces energy even with no Sun due to "natural cooling phenomenon”

A team of researchers at UCLA and Stanford University created a device that could be a substitute for solar panels. However, unlike solar panels, this dark photovoltaic works at night. This article explains how this device works and what the future holds for it.

The science behind this groundbreaking invention

The sun is a major source of energy. Therefore, making a device that generates electricity like a solar panel but does not require sunlight might seem too good to be true. The science behind this device is based on a phenomenon known as Radiative Sky Cooling. What does this mean? It is a phenomenon in which an object releases thermal energy into the air, which then rises into the upper atmosphere. After releasing energy, the object becomes cooler than the surrounding environment.

But how did these researchers exploit this phenomenon to generate electricity? They developed a device, referred to as dark photovoltaics, which can capture the released thermal energy and prevent it from escaping into the upper atmosphere, while converting thermal energy into electrical energy.

The parts of this new technology are cheap!

This device has an aluminum disk and a thermoelectric generator. The aluminum disk has a side painted black, which faces the sky when placed on a rooftop. This disk radiates heat energy into the surroundings to create a temperature difference. After releasing this energy, the thermoelectric generator senses this temperature difference and converts the heat into electricity.

What makes this device special is how cheap it is. The equipment used costs less than $30, which is relatively cheap for its value. This makes it easy to acquire, especially for people living in poor regions.

Although this is a new invention, the idea behind this device was derived from a thermocouple, which was invented as far back as 1821. A thermocouple works by generating a voltage due to a temperature difference between two junctions.

How effective is this new technology?

The energy generated by this device is small compared to that of a solar panel. It generates approximately 25 milliwatts per square meter, in contrast to solar panels that can generate up to 1,000 watts. However, this energy is still enough to power a bulb and can be very useful in areas that do not have electricity.

While the small amount of energy generated by this device can not be used to power heavy engines, its effectiveness in running low-power electronics and its reliability at night stand out. For instance, it could be used in a weather station to measure temperature all through the night, as a substitute for a solar panel that has worked during the day, just like this amazing device that harvests energy from falling rain.

What the future holds for this dark photovoltaic

The inspiration for this device came when the team lead, Aaswath Raman, realised that certain areas in developing countries lack access to electricity at night. He explained that during one of his travels, he passed through a village and didn’t realize it because it was so dark.  With this device, problems like poor access to electricity will be solved in many parts of the world.

Raman is hopeful for the future of this device. He believes that if enough investment goes into this project and better components are used, the device will be able to generate more power. This will consequently improve the generation of power in the technology industry and its usability amongst people.

This dark photovoltaic device is one of the most fascinating discoveries in recent technology. All you have to do is fix the device on top of your roof at night and watch it generate power like magic. Although its capabilities can’t be compared to solar panels just yet, it could be a source of monumental energy in the future, just like this groundbreaking technology that turns flight into power.

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