Japan’s physics and chemistry research institute designs a cogeneration system using solar Fresnel lenses
Working in partnership with Davinci, a company based in Yamatotakada City, Nara Prefecture, the Japan Institute of Physical Chemistry has developed an innovative system that uses Fresnel lenses to capture and convert solar thermal energy throughout the day. This system not only heats water but also generates electricity, making it a true cogeneration solution. The core idea behind this technology is to harness sunlight’s heat energy through a specially designed Fresnel lens. The lens, which features concentric circular grooves, is shaped into a cube for optimal light collection. Unlike traditional solar systems that require tracking devices, this setup can efficiently collect solar energy regardless of the sun’s angle. The lens itself is highly efficient, thin, and made with precision—its surface roughness is just 20 nanometers, ensuring maximum light transmission. This lens is based on a telescope head currently being developed for detecting high-energy cosmic rays. Its advanced optical properties make it ideal for solar energy applications. The system is installed on top and sides of the cube, creating what is known as the “Fresnel Sun House.†Inside the structure, an inverted T-shaped heat exchanger made from aluminum alloy captures the concentrated light and transfers the heat efficiently, whether the sunlight comes from above or the side. Beneath the heat exchanger lies a thermal storage tank filled with water. As the water heats up, it is then used to power a rotary heat engine developed by Davinci. This engine uses Freon as a working fluid, which changes from liquid to gas when heated. The expansion of the gas drives the engine, converting thermal energy into mechanical energy and ultimately generating electricity. One of the key advantages of this system is its ability to operate efficiently even at low temperatures—around 40°C—making it suitable for a wide range of environments. What sets this cogeneration system apart is its simplicity and efficiency. It eliminates the need for expensive solar tracking equipment and relies on water storage for stable energy output. This makes it a reliable and cost-effective solution for decentralized power generation. Looking ahead, Riken plans to implement this technology on a smaller scale, utilizing underused land in collaboration with local governments. In 2013, they aim to introduce a 1 kW trial model, followed by a 10 kW demonstration system in 2014, marking a significant step toward sustainable and accessible solar energy solutions. 2 Flutes Spot Drill for Aluminum,HRC58 Spot Drill for Aluminum,Tungsten Carbide Spot Drill for Aluminum Suzhou Meiwei Cutting Tools LTD , https://www.meiweitools.com