Thermoelectric Energy Conversion and Waste Heat Recovery
Summary
Thermoelectric energy conversion harnesses temperature differences to produce electrical power directly through solid‐state devices. Central to this process is the Seebeck effect, by which charge carriers driven by a thermal gradient generate a voltage. Devices based on bismuth‐telluride, skutterudites and other advanced materials have achieved steady improvements in efficiency, expressed by the dimensionless figure of merit (ZT). Thermoelectric generators (TEGs) offer silent operation, scalability and long service life, making them well suited to recover waste heat from industrial processes, automotive exhausts and microelectronic systems. Critical challenges include enhancing material performance at relevant temperatures, optimising thermal interfaces and heat‐exchanger design, and integrating power‐electronic converters for maximum power point tracking. Recent advances in nanostructuring, module architecture and system‐level modelling have furthered the potential for practical deployment, promising reductions in carbon emissions and improvements in overall energy efficiency across diverse sectors.
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Thermoelectric Energy Conversion and Waste Heat Recovery publication trend
The graph below shows the total number of articles in thermoelectric energy conversion and waste heat recovery across all publications each year (not limited to Nature Index journals).
Technical terms
Seebeck effect: Generation of an electromotive force in a conductor or semiconductor subject to a temperature gradient.
Figure of merit (ZT): Dimensionless parameter (S²σT/κ) quantifying thermoelectric efficiency, where S is the Seebeck coefficient, σ the electrical conductivity, κ the thermal conductivity and T the absolute temperature.
Thermoelectric generator (TEG): Solid‐state device converting heat flow directly into electricity via coupled thermal and electrical transport phenomena.
Maximum power point tracking (MPPT): Electronic control method that adjusts load conditions to extract maximum electrical power from a TEG under varying temperatures.
Heat exchanger: Mechanical assembly that transfers thermal energy between a heat source and the thermoelectric device to establish and maintain a temperature difference.
References
- Thermoelectric generator (TEG) technologies and applications. International Journal of Thermofluids (2021).
- A dynamic model for thermoelectric generator applied to vehicle waste heat recovery. Applied Energy (2018).
- Prediction of the fuel economy potential for a skutterudite thermoelectric generator in light-duty vehicle applications. Applied Energy (2018).
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