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Three guys of solar air heat sink
At the end of 2012, as the sun began to rise early in the morning, revealing its round and smiling face on the horizon, three young men from the Institute of Engineering Thermophysics of the Chinese Academy of Sciences had already integrated themselves into a massive structure resembling a satellite dish. This was no ordinary setup—it was a solar-powered dish condenser standing at the edge of the desert.
The parabolic mirror, composed of 33 high-performance mirrors, looked like a magnificent sunflower slowly turning toward the sun. At its center stood a 10-meter-long steel frame, with the focal point located on the surface of the dish. On top of the mirror sat a cylindrical device—the result of months of hard work by the three young researchers. Its official name was a solar air heat absorption device, but for them, it represented the culmination of their passion and dedication.
*Solar air heat absorber*
*The results of the hard work of three young men*
Although it was now the 30th day of the experiment, the three still remembered the first day clearly. Their first challenge was repairing the solar condenser’s surface. They climbed over the large structure, cleaning sand and debris from the mirrors. The site was originally deserted, and the harsh conditions made the task even more difficult. Winds carried fine sand, cold gusts mixed with dust, and the glare from highly reflective surfaces added to the challenges. Even clean water could freeze due to low temperatures, making every step of the process painstaking.
After working for three or four days, they often found that the condenser spots on the mirrors had been scattered—either because someone stepped on them or because too much force was used during cleaning. Adjusting each spot repeatedly, they finally managed to clean all 33 mirrors, covering a total area of 55 square meters, after nearly a week of intense effort.
This project was part of the Institute Innovation Fund, led by expert Lin Feng, a member of the “Thousand Talents Program.†The full title of the project was “Concentrator Solar Thermal Power Turbine Development.†The basic principle involved using the concentrated sunlight from the dish-shaped condenser to heat compressed air to around 800 degrees Celsius, which then powered an air turbine to generate electricity—converting solar energy directly into electrical power.
One morning, the team worked intensively, and before they knew it, it was almost noon. The three young men ate lunch at a nearby ecological park cafeteria. Their colleagues and team members were deeply concerned about their well-being. Through online communication, everyone stayed updated on their progress.
Despite the tough environment, the three never complained. Their strong work ethic and positive attitude left a deep impression on the local park staff. The kind managers, moved by their enthusiasm, offered them discounted accommodation and allowed them to eat at the staff canteen, helping them save time and focus more on their research.
In the afternoon, the team continued adjusting the focus of the solar condenser. The goal was to concentrate the sunlight into a single point, funneling over 50 square meters of direct solar energy into a 200mm-diameter hole through the parabolic mirror. This tiny focal point could reach energy densities of up to megawatts per square meter.
Adjusting each of the 33 mirrors required precision. To avoid interference from other reflected light, the trio designed custom shielding devices for each mirror. Since they needed to track the sun’s position throughout the day, and wind was strong at 12 meters above the ground, they had to carefully adjust the focus while clinging to the mirror stand with a safety rope.
The adjustment process lasted nearly a week, and when they finally succeeded, the bright spot at the focus brought smiles of victory to their faces.
As the sun set, the preparation for the field trial was complete. Soon, they would return to Beijing for more theoretical calculations and design work. Cold winds couldn’t stop them from pushing forward in scientific research. Despite the challenges, the three young men found joy in overcoming obstacles and challenging nature, realizing their own value in the process.
Research is not just about theory and models—it's also about the satisfaction of bringing ideas to life, facing nature, and achieving personal growth. The three young researchers are Wang Dunjin, Ji Chuanliang, and Paul Weigl. Among them, Paul is from the University of Hannover in Germany and was the first German PhD student to study in China.