Portuguese 
English 
Spanish 
3 min of reading 
0 comments 
New System Uses High Exhaust Temperature to Generate Electricity, Providing Greater Energy Efficiency and Contributing to a More Sustainable Future in the Automotive Industry
Internal combustion engines are known to waste a large portion of the energy generated. It is estimated that up to 75% of the electricity produced is dissipated as heat. This problem has accompanied this technology since its creation, making it less efficient than it could be.
However, researchers at Pennsylvania State University have developed a system capable of recovering some of this wasted energy and converting it into electricity.
The research, published in the journal ACS Applied Materials and Interfaces, presents a device called a thermoelectric generator (TEG). It can be installed in the vehicle’s exhaust system to transform exhaust heat into usable energy. This advancement could represent an important step toward increasing the efficiency of combustion engines.
-
Advance in Brazilian science: Brazilian researchers reveal surprising method that transforms carbon dioxide into clean energy with sunlight and could reduce part of the pollution responsible for global climate change.
-
Renewable energy sources are gaining global prominence by driving the energy transition and reducing environmental impacts in the face of advancing climate change.
-
In 2026, a container ship on the Oslo-Hamburg route will abandon diesel and use fertilizer as fuel: the Yara Eyde ushers in the era of green ammonia in maritime transport.
-
Powering ChatGPT and the world’s data centers in 2026 will require more than 1,000 TWh of electricity — equivalent to Japan’s entire consumption.
How The Thermoelectric Generator Works
Thermoelectric generators are not exactly a novelty. They have been used to convert temperature differences into electricity. However, conventional models are complex, bulky, and often require water cooling systems, limiting their application in vehicles.
The new device developed by the researchers presents a more efficient and compact solution. It uses bismuth telluride, a semiconductor material that allows the movement of electrons between a hot side and a cold side, generating an electric current.
The biggest challenge of this technology has always been to maintain the temperature differential without compromising the efficiency of the system. To address this, the researchers developed a special heat sink.
The design of the heat sink features protrusions similar to the fins that surround the vehicle’s exhaust pipe. This facilitates heat dissipation through forced convection, ensuring the operation of the thermoelectric generator without the need for additional cooling systems.
Test Results and Potential Applications
The prototype of the device showed a maximum power output of 40 watts, sufficient to power small electronic devices, such as a cell phone charger. In tests simulating a car at high speed, the production reached 56 watts.
The researchers also tested the system in a helicopter, connecting it to the air outlets. In this situation, the thermoelectric generator produced 146 watts.
Although this value is still small compared to the energy needs of a vehicle, it represents an energy gain that would otherwise be completely wasted.
One of the main benefits of this technology is its characteristics. The system can be installed in vehicle exhausts without major modifications and without significantly increasing the weight or complexity of the engine. This makes its adoption more feasible in different types of transport.
Potential In Different Vehicles
Cars are not the only ones to benefit from this innovation. Off-road vehicles and motorcycles, which have more exposed exhausts, can achieve even more efficient heat dissipation. This enhances energy recovery without compromising engine performance.
Additionally, the technology could be especially useful for hybrid vehicles. The electricity generated by the system could be stored and used to extend battery range, making the operation of these vehicles even more efficient.
Impact On The Efficiency Of Combustion Engines
The research reinforces that combustion engines still have room for improvement. While electric vehicles are considered the future of mobility, advancements like this can make current engines more sustainable while the energy transition takes place.
The recovery of thermal energy can reduce fuel consumption and decrease emissions of harmful gases. Even though the amount of electricity generated is still modest, the possibility of utilizing wasted heat represents a significant gain for energy efficiency.
This development shows that, despite the limitations of combustion engines, there is still room for innovation. Small technological advancements can contribute to a more rational use of available resources, providing benefits for both users and the environment.
With information from New Atlas.
Be the first to react!