A linear nonequilibrium thermodynamics approach to optimization of thermoelectric devices

TL;DR

This paper applies linear nonequilibrium thermodynamics to optimize thermoelectric devices by analyzing impedance matching conditions, emphasizing the importance of environmental interactions for improved performance.

Contribution

It introduces a thermodynamic framework for optimizing thermoelectric devices considering environmental interactions and impedance matching, extending traditional approaches.

Findings

Electrical and thermal impedance matching are crucial for optimal performance.

The thermodynamic approach provides insights into device operation under environmental coupling.

Outlook on mesoscopic systems suggests future research directions.

Abstract

Improvement of thermoelectric systems in terms of performance and range of applications relies on progress in materials science and optimization of device operation. In this chapter, we focuse on optimization by taking into account the interaction of the system with its environment. For this purpose, we consider the illustrative case of a thermoelectric generator coupled to two temperature baths via heat exchangers characterized by a thermal resistance, and we analyze its working conditions. Our main message is that both electrical and thermal impedance matching conditions must be met for optimal device performance. Our analysis is fundamentally based on linear nonequilibrium thermodynamics using the force-flux formalism. An outlook on mesoscopic systems is also given.