Science 2 min read

Radiative Cooling System Produces Electricity from Space

Thanks to radiative cooling phenomenon, a novel thermoelectric device can generate light from the cold darkness of the night.

Image courtesy of Shutterstock

Image courtesy of Shutterstock

Nearly a billion people worldwide still live in the dark, with no electricity at all. In rural America, roughly 16% of all American households bear a greater energy burden compared to those in metropolitan areas.

During the night, solar cells are useless in off-grid regions, but this is where radiative cooling comes in.

This natural process, also called passive cooling, is one of the most affordable and reliable ways to provide communities in remote areas access to electricity.

Radiative Cooling, a Complementary to Solar

Material scientists and engineers at the University of California, Los Angeles (UCLA) and Stanford University have designed a thermoelectric device that generates light from nothing than the cold, night sky.

While photovoltaic systems can fulfill the power needs during the day, they can’t harness the waste power of the cold darkness of space.

The UCLA and Stanford system was explicitly designed for that, as a low-cost alternative to solar cells for night-time.

“Remarkably, the device is able to generate electricity at night, when solar cells don’t work,” says lead author Aaswath Raman, assistant professor of materials science and engineering at UCLA.

“Beyond lighting, we believe this could be a broadly enabling approach to power generation suitable for remote locations, and anywhere where power generation at night is needed.”

In 2018, professor Raman gave a TED talk where he explained how radiative cooling works and how the “night-sky cooling” technology can revolutionize current cooling systems.

The UCLA/Stanford team led by Raman wanted to go as low-cost as they can get. They built their passive thermoelectric generator using cheap components found in stores and costing less than $30 USD, like thermoelectric modulator, sheet metal, and Styrofoam.

The system produces 25 milliwatts per square meter, enough energy to passively power a LED light and keep it on through the night.

As professor Raman notes, there’s, however, a caveat in that the amount of power the system can generate is minimal. But the technology can be scaled to meet some energy demands, like passively powering streetlights during the night, off-grid sensors, and other devices.

“It literally is generating visible light out of the darkness of the sky. This is not even paraphrasing; this is exactly what it is,” Raman said.

Read More: New Solar Device Harvests Energy From Sun and Beams Heat Into Space

First AI Web Content Optimization Platform Just for Writers

Found this article interesting?

Let Zayan Guedim know how much you appreciate this article by clicking the heart icon and by sharing this article on social media.


Profile Image

Zayan Guedim

Trilingual poet, investigative journalist, and novelist. Zed loves tackling the big existential questions and all-things quantum.

Comments (0)
Most Recent most recent
You
share Scroll to top

Link Copied Successfully

Sign in

Sign in to access your personalized homepage, follow authors and topics you love, and clap for stories that matter to you.

Sign in with Google Sign in with Facebook

By using our site you agree to our privacy policy.