Performance improvement of an automotive thermoelectric generator by introducing a novel split fin structure

Ding Luo, Shuo Yang, Haokang Zhang, Jin Cao, Yuying Yan and Hao Chen

Applied Energy, 2025, vol. 382, issue C, No S0306261924026023

Abstract: In this research, a novel split fin structure is proposed to enhance the performance of automotive thermoelectric generators (ATEGs). The traditional plate fin is segmented into two identical secondary fins from the middle, improving the thermal contact area of fins and the overall performance of ATEGs. To explore the optimal fin geometry, parametric studies are conducted on the split angle (α) and vent height coefficient (e) through numerical simulations. The results demonstrate a significant enhancement in the output performance of the ATEG using split fins compared to using plate fins. Increasing the split angle and reducing the vent height coefficient can enhance the output power, conversion efficiency, and temperature uniformity of the ATEG. At an exhaust mass flow rate of 20 g/s and an exhaust temperature of 550 K, the ATEG with α = 25.04o and e = 0.8 of split fins exhibits improvements in output power, output voltage, conversion efficiency, and voltage uniformity by 23.71 %, 11.28 %, 11.29 %, and 2.23 %, respectively, compared to the ATEG with traditional plate fins. This study provides a solid theoretical foundation and practical guidance for designing novel fins to enhance ATEG performance.

Keywords: Thermoelectric generator; Waste heat recovery; Split fin; Heat exchanger (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.apenergy.2024.125218

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