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Electrical and mechanical analysis of a segmented solar thermoelectric generator under non-uniform heat flux

Shittu, Samson; Li, Guiqiang; Xuan, Qindong; Zhao, Xudong; Ma, Xiaoli; Cui, Yu

Authors

Qindong Xuan

Yu Cui



Abstract

Optimization of segmented solar thermoelectric generator for power output enhancement has been well researched however, the mechanical reliability study of such devices is usually neglected. In addition, assumed heat flux distribution or uniform flux distribution from solar concentrators is usually used for solar thermoelectric generator however, this is not accurate. Therefore, this study presents a detailed three-dimensional numerical investigation on the effect of non-uniform and uniform heat flux on the electrical and mechanical performance of segmented and non-segmented solar thermoelectric generator. Flux distribution from a compound parabolic concentrator is obtained by ray tracing using Lighttools software and COMSOL 5.4 Multiphysics software is used to perform the numerical study based on finite element method. Thermal stress analysis in a full-scale solar thermoelectric generator is presented and the effects of load resistance, solar radiation and cold side temperature on performance of solar thermoelectric generator is analysed. Results show that the power output of the segmented solar thermoelectric generators in Case 3, Case 4 and Case 5 increased by 44.07%, 59.12% and 37.9% respectively compared to that of Case 1 (bismuth telluride non-segmented solar TEG) at 13000W/m2. Results from this study will provide valuable guidance for segmented and non-segmented solar thermoelectric generator design.

Journal Article Type Article
Publication Date May 15, 2020
Journal Energy
Print ISSN 0360-5442
Electronic ISSN 1873-6785
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 199
Article Number 17433
APA6 Citation Shittu, S., Li, G., Xuan, Q., Zhao, X., Ma, X., & Cui, Y. (2020). Electrical and mechanical analysis of a segmented solar thermoelectric generator under non-uniform heat flux. Energy, 199, https://doi.org/10.1016/j.energy.2020.117433
DOI https://doi.org/10.1016/j.energy.2020.117433
Keywords Segmented thermoelectric generator; Non-uniform heat flux; Thermal stress; Finite element method; TEG
Publisher URL https://www.sciencedirect.com/science/article/abs/pii/S0360544220305405
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