High performance and thermal stress analysis of a segmented annular thermoelectric generator

Shittu, Samson; Li, Guiqiang; Zhao, Xudong; Ma, Xiaoli; Akhlaghi, Yousef Golizadeh; Ayodele, Emmanuel

doi:10.1016/j.enconman.2019.01.064

Cited by 154 publications

(54 citation statements)

References 68 publications

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“…In addition, steady state heating is also analysed and compared to the transient pulsed heating. The numerical model used in this study has been verified by the authors in [3], [7] therefore, the results from this study can be trusted as accurate.…”

Section: Resultsmentioning

confidence: 57%

“…Therefore, renewable energy sources are being paid more attention recently due to the unique advantages they offer such as inexhaustibility and low pollution. In automobiles, about 40% of fuel energy is wasted as exhaust gas in the internal combustion engine [3]. Therefore, there is need for a technology that can utilize this waste heat for beneficial use.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermoelectric Generator Performance Enhancement by the Application of Pulsed Heat Power

Shittu¹,

Li²,

Zhao³

et al. 2019

International Conference on Fluid Flow, Heat and Mass Transfer

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Thermoelectric generator (TEG) is usually studied under steady state heating conditions however, the use of pulsed heat power could significantly enhance its performance. Therefore, this paper presents a numerical investigation of the thermal and electrical performance of a typical thermoelectric generator (TEG) under both steady state and transient pulsed heating conditions. A threedimensional finite element model is used to study the temperature, voltage, current distribution and power output of the TEG. A comparison is made between the performance of the TEG under steady state and transient pulsed heating conditions. Furthermore, a parametric study is performed to investigate the influence of thermoelectric leg length and cross-sectional area on the performance of the TEG under both heating conditions. Rectangular and triangular pulsed heat functions are used for the transient study. Results show that rectangular pulsed heating provides the best performance compared to the triangular pulsed heating and steady state heating. In addition, the power output of the TEG decreased as the leg height increased however, it increased as the leg area increased. Therefore, shorter thermoelectric legs with wider cross-sectional area are suggested to enhance the performance of the TEG. This study will provide a valuable reference for future design of thermoelectric generators to obtain optimum performance.

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Section: Resultsmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Thermoelectric Generator Performance Enhancement by the Application of Pulsed Heat Power

Shittu¹,

Li²,

Zhao³

et al. 2019

International Conference on Fluid Flow, Heat and Mass Transfer

Self Cite

View full text Add to dashboard Cite

show abstract

“…Numerous studies have investigated energy conversion efficiency and thermal reliability of segmented flat [18][19][20] and segmented annular. [21][22][23][24][25] Optimization of STEG systems has also been considered. Ma et al 26 investigated different TE segment length ratios to evaluate the performance of flat STEGs and showed that increasing the length of skutterudite segments led to the enhanced TE performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of energy conversion efficiency and thermal reliability of novel, unileg segmented thermoelectric generation systems

Aljaghtham

Çelik

2021

Int J Energy Res

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Despite their great potential to recover waste heat, thermoelectric generators (TEGs) find limited usage since thermoelectric materials are only efficient within a limited temperature range. Using multiple materials in segmented TEGs can significantly enhance the overall energy conversion efficiency. However, thermal reliability is questionable in these systems especially at elevated temperatures and in annular configurations. This study explores the feasibility of utilizing unileg (single material) segmented TEG configuration as a remedy for the thermal stress problem. This study introduces the concept of unileg, segmented thermoelectric configurations (flat and annular) for the first time, and three-dimensional finite element simulations are conducted to investigate the thermoelectric performance and thermal reliability analysis in comparison with the conventional unicouple (dual material) systems. Results indicate that thermal stresses are significantly lowered in unileg systems compared to the unicouple configuration. In addition to the enhanced thermal reliability, power generation and thermoelectric conversion efficiency are higher in unileg systems since the material with higher performance is used solely eliminating the need of poorly performing, second thermoelectric leg material.

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“…Recent investigations of annular thermoelectric generators (ATEG) and segmented annular generators (SATEG) show that the performance is optimal when the annular shape parameter , that is, the power increases with the increase of Sr , reaches its maximum value when it becomes a flat-plate thermoelectric and decreases the power again. It has also been shown that to improve the heat transfer capacity and efficiency, the contact area of the high temperature zone ( ) can be increased 14 – 16 .…”

Section: Introductionmentioning

confidence: 99%

A comprehensive analysis on nanostructured materials in a thermoelectric micro-system based on geometric shape, segmentation structure and load resistance

Olivares-Robles

Badillo-Ruiz

Ruiz-Ortega

2020

Sci Rep

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In this study, we report the novel energy behavior of high-performance nanostructured materials in a segmented thermoelectric micro-generator (TEG). Several physical elements of the materials must be considered to determine their behavior in the thermoelectric energy conversion: temperature dependence of material properties, geometric structure, segmentation, and the symmetry of each or both p-type and n-type nanostructure semiconductor thermoelements. Recently, many efforts have reported effects independent on the thermoelectric performance of semiconductor materials. In this work, exhaustive research on the performance of high-performance nanostructured materials in a segmented thermoelectric micro-generator (TEG) was carried out. Our results show the efficiency and output power of the TEG using the temperature-dependent model, i.e., a variable internal resistance for a load resistance of the system. Our approach allows us to analyze symmetrical and asymmetric geometries, showing maximum and minimum peaks values in the performance of the TEG for specific $$\gamma $$ γ values. The performance of the TEG is improved by about $$6\%$$ 6 % and $$7\%$$ 7 % , for efficiency, and output power, respectively, considering a trapezoidal geometric shape in the 2p-3n segmented system, compared with the conventional rectangular shape.

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High performance and thermal stress analysis of a segmented annular thermoelectric generator

Abstract: Nomenclature r radius, mm angle of a single thermoelectric leg, degree half of the angle between two legs, degreeHigh performance and thermal stress analysis of a segmented annular thermoelectric generator

Cited by 154 publications

References 68 publications

Thermoelectric Generator Performance Enhancement by the Application of Pulsed Heat Power

Thermoelectric Generator Performance Enhancement by the Application of Pulsed Heat Power

Numerical analysis of energy conversion efficiency and thermal reliability of novel, unileg segmented thermoelectric generation systems

A comprehensive analysis on nanostructured materials in a thermoelectric micro-system based on geometric shape, segmentation structure and load resistance

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