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IIT-Guwahati researchers design electricity-free radiative cooler

Researchers at IIT-Guwahati have designed an affordable and efficient ‘passive’ radiation cooling system that does not require electricity to operate.

Researchers at IIT-Guwahati have designed an affordable and efficient ‘passive’ radiation cooling system that does not require electricity to operate.

This ‘radiative cooler’ coating material is a ‘power-free’ cooling system because it can be used both on the roof and during the day and at night which can provide an alternative to conventional air-conditioners, IIT-Guwahati said in a statement on Monday.

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Passive radiation cooling systems work by emitting heat absorbed from the surroundings in the form of infrared radiation that can pass through the atmosphere before the cold is released into outer space.

While most passive radiation coolers operate only at night and during the day, these coolers also need to fully reflect solar radiation. Until now, these cooling systems have not been able to provide adequate cooling during the day.

A research team from IIT-Guwahati, led by Ashish Kumar Chowdhury, a research scholar at the institute, under the supervision of Professor Debabrata Sikder, an assistant professor in the Department of Electronics and Electrical Engineering, designed such a passive radiative cooler to solve these problems. And bring an affordable and more efficient radiating cooling system that can work twenty-four hours a day.

Highlighting the unique aspects of this innovation, Professor Sikder said, “It is more challenging to design a passive radiative cooler for daytime operation during the entire solar spectral regime (0.3-2.5 µm wavelength) and the simultaneous need for high emissions in the atmosphere. Transmission. Wavelength).

“The operation of these radiative coolers does not require any external power source, and may be one of the best alternatives to replacing conventional air conditioning systems used to cool buildings and automobiles in hot climates such as India,” he added.

The theoretical design of radiating cooling systems is tested and verified against rigorous computer-based simulations.

This pattern-free design of the radiator cooler is compatible with large-field and, therefore, also reduces the risk of imperfections during the manufacturing process, the release said.

“The team hopes that once it reaches the market, large-sized prototypes will be built and tested for operational stability and durability in different climatic conditions. They are now working towards this,” the statement added.

The main advantages of this system over existing technologies include lithography-free and large-field consistent design and ensuring effective cooling throughout the day without the need to adjust the angle or position of the cooling device towards the sun.

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