Every day, huge amounts of energy are wasted as heat. Cars release heat through their exhaust, factories lose heat during production, and even our own bodies give off warmth.
Scientists have long wanted to capture this lost energy and turn it into electricity.
Now, a new study shows that computers may hold the key to doing this far more effectively.
Researchers have developed a new kind of thermoelectric generator, a device that can convert heat directly into electricity.
The study, published in Nature Communications, reports a design that performs more than eight times better than traditional versions.
Thermoelectric generators are not a new idea. They have even been used by NASA to power spacecraft in deep space, where sunlight is too weak for solar panels.
These devices work by taking advantage of temperature differences. When one side of the device is hot and the other is cool, electricity can be generated without any moving parts or fuel.
Although scientists have made progress in improving the materials used in these devices, real-world performance has often been disappointing.
This is because efficiency depends not only on the material but also on how the device is designed. Heat flow, electrical resistance, and contact between components all play a role, and balancing these factors is very complex.
Traditionally, engineers have relied on experience and repeated testing to design these systems. But in this new research, the team took a different approach. Led by scientists from POSTECH and UNIST, they used a computer-based method called topology optimization.
Instead of starting with a familiar shape, the computer was given the conditions the device would operate under, such as temperature differences and material properties. It then searched for the best possible structure to maximize efficiency. The results were surprising.
Rather than simple rectangular blocks, the computer designed unusual shapes, including forms that look like the letter “I” or an uneven hourglass. These shapes may seem strange, but they help control how heat moves through the device. By guiding heat more effectively and reducing energy losses, they significantly improve performance.
The team then brought these designs to life using 3D printing. When tested, the best design produced over eight times more power than a standard rectangular generator. The experimental results closely matched the computer’s predictions, showing that the method is reliable.
This breakthrough suggests a new direction for energy technology. Instead of focusing only on better materials, scientists can now also improve performance through smarter design. In the future, this approach could help recover wasted heat from many sources, making systems more energy-efficient.
It also points toward a future where computers, possibly combined with artificial intelligence, can design complex devices without human trial and error. By letting computers explore possibilities beyond human imagination, engineers may unlock solutions that were previously out of reach.
