Development and Performance Analysis of a Thermoelectric Generator (TEG) System for Waste Heat Recovery and Power Generation in Industrial Applications: A Comprehensive Review

Abstract

The increasing global demand for energy and the simultaneous depletion of conventional energy resources have intensified the need for efficient energy utilization technologies. A significant portion of energy used in industrial processes and internal combustion engines is lost as waste heat, which contributes to environmental pollution and reduced system efficiency. This review paper focuses on the potential of thermoelectric generators (TEGs) for converting waste heat into useful electrical energy. Thermoelectric generators operate based on the Seebeck effect, enabling direct conversion of temperature differences into electricity without any moving parts. This paper reviews recent advancements in thermoelectric materials, system design, and performance optimization techniques for waste heat recovery applications. Various studies demonstrate that TEG systems can be effectively integrated into industrial exhaust systems, automotive engines, and high-temperature processes to generate sustainable power. The performance of TEG systems depends on factors such as temperature gradient, material efficiency, and thermal management. Although the conversion efficiency is relatively low, ongoing research in advanced materials and hybrid systems is improving their feasibility. The review concludes that thermoelectric generators offer a promising, eco-friendly solution for enhancing energy efficiency and reducing environmental impact through effective waste heat recovery.

Introduction

The study focuses on the growing need for energy efficiency due to increasing global energy demand and the depletion of fossil fuels. A major issue in industrial systems and engines is the large amount of energy lost as waste heat, where only 30–40% of input energy is converted into useful work. Waste heat recovery using Thermoelectric Generators (TEGs) is proposed as a promising solution, as TEGs directly convert heat into electricity using the Seebeck effect.

TEGs offer advantages such as no moving parts, low maintenance, compact size, and environmental friendliness, making them suitable for industrial, automotive, and remote applications. However, their main limitation is low efficiency (3–8%), along with challenges in maintaining temperature gradients, thermal management, high material costs, and integration into existing systems.

The literature shows that TEG performance improves with higher temperature differences, better cooling systems, and advanced thermoelectric materials. Applications in industrial exhausts and automotive systems demonstrate potential for small- to medium-scale power generation, though efficiency remains limited.

Key research gaps include lack of large-scale real-world implementation, poor thermal management in practical conditions, high material costs, and limited work on hybrid systems combining TEGs with other technologies.

The proposed methodology involves placing TEG modules between heat sources and heat sinks, measuring temperature differences, and converting waste heat into electrical power for storage or direct use. Overall, while TEG technology is promising for sustainable energy recovery, improvements in efficiency, scalability, and system integration are essential for widespread adoption.

Conclusion

The study of power generation from waste heat using thermoelectric generators (TEGs) highlights an effective and sustainable approach to improving energy efficiency in industrial and automotive systems. A significant amount of energy is lost as heat during various processes, which can be effectively utilized using TEG technology. By converting temperature differences directly into electrical energy through the Seebeck effect, TEGs provide a clean, reliable, and eco-friendly solution without the need for moving parts or fuel. The system offers several advantages such as compact size, low maintenance, silent operation, and the ability to function in harsh environments. It can be applied in industries, automobiles, and even small-scale applications like portable device charging. Although the efficiency of TEG systems is relatively low, advancements in thermoelectric materials and system design can enhance performance in the future. Overall, thermoelectric generators present a promising technology for waste heat recovery, helping to reduce energy losses, lower environmental pollution, and contribute toward sustainable energy development. With further research and optimization, TEG systems can play a vital role in future energy solutions.

References

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Copyright

Copyright © 2026 Ms. Vedanti Chandrashekhar Kawale, Prof. Ankita Khandait. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.