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Harnessing the Sun: Innovative Thermal Trap Reaches Over 1000 °C Using Sunlight

May 28, 2024
in Science
Harnessing the Sun: Innovative Thermal Trap Reaches Over 1000 °C Using Sunlight
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Experimental Thermal Trap

Illustration of the experimental thermal trap. It consists of a quartz rod (inside) and a ceramic absorber (outside). Solar radiation enters at the front, heat is generated in the rear area. Credit: Casati E et al. Device 2024, edited

In the future solar energy could be used to produce cement or steel, instead of burning coal or oil for this purpose. Researchers at ETH Zurich have developed a thermal trap that can absorb concentrated sunlight and deliver heat at over a thousand degrees Celsius.

A new thermal trap uses sunlight to reach a temperature of over a thousand degrees Celsius.The new technology minimizes heat losses making it possible to generate this high temperature efficientlyThe approach could help to provide industrial plants with high temperatures and thus make these industries carbon neutral.Industrial Heat Processes

The production of cement, metals, and many chemical commodities requires extremely high temperatures of over a thousand degrees Celsius. At present, this heat is usually obtained by combusting fossil fuels: coal or natural gas, which emit large amounts of greenhouse gases. Heating with renewable electricity is not an alternative, as this would be inefficient at these high temperatures. Although much of our economy and society will need to become carbon neutral in the coming decades, these industrial processes are likely to continue to be powered by fossil fuels for the near future. They are considered difficult to decarbonize.

Breakthrough in Solar Thermal Technology

Scientists at ETH Zurich have now demonstrated, in the lab, a way to make these industries independent of fossil fuels. Using solar radiation, they have engineered a device that can deliver heat at the high temperatures needed for the production processes. The team led by Emiliano Casati, a scientist in the Energy and Process Systems Engineering Group, and Aldo Steinfeld, Professor of Renewable Energy Carriers, has developed a thermal trap. It consists of a quartz rod coupled to a ceramic absorber which, thanks to its optical properties, can efficiently absorb sunlight and convert it into heat.

In their lab-scale experiments, the team used a quartz rod measuring 7.5 centimeters in diameter and 30 centimeters in length. They exposed it to artificial light with an intensity equivalent to 135 times that of sunlight, reaching temperatures of up to 1050 degrees Celsius. Previous studies by other researchers have achieved a maximum of 170 degrees with such thermal traps.

Quartz Thermal Trap Crop

The main component of the thermal trap is a cylinder made of quartz. In the experiments, it reached a temperature of 1050 degrees Celsius and glowed at this heat. Credit: ETH Zurich / Emiliano Casati

Large-scale solar concentrating technologies are already established at an industrial scale for solar power generation, for example in Spain, the US, and in China. These plants typically operate at up to 600 degrees. At higher temperatures, heat loss by radiation increases and reduces the efficiency of the plants. A major advantage of the thermal trap developed by ETH Zurich researchers is that it minimizes radiative heat losses.

High-Temperature Solar Plants

Our approach significantly improves the efficiency of solar absorption,” says Casati. “We are, therefore, confident that this technology supports the deployment of high-temperature solar plants.” However, detailed technical and economic analyses are still pending, he says. Such analysis is beyond the scope of the current experimental study, which the researchers have published in the scientific journal Device.

Casati is continuing his research to optimize the process. The technology could one day make it possible to use solar energy not only to generate electricity, but also to decarbonize energy-​intensive industries on a large scale. “To combat climate change, we need to decarbonize energy in general,” says Casati. “People often think of energy in terms of electricity, but we actually use about half of our energy in the form of heat.”

For more on this research, see Solar Power Shatters the 1,000°C Barrier for Industrial Heating.

Reference: “Solar thermal trapping at 1,000°C and above” by Emiliano Casati, Leo Allgoewer and Aldo Steinfeld, 15 May 2024, Device.
DOI: 10.1016/j.device.2024.100399

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/harnessing-the-sun-innovative-thermal-trap-reaches-over-1000-c-using-sunlight/

Tags: Harnessinginnovativescience
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