Modelling and comprehensive analysis of TEGs with diverse variable leg geometry

Ibeagwu, Onyebuchi Isreal

doi:10.1016/j.energy.2019.05.088

Cited by 72 publications

(34 citation statements)

References 21 publications

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“…By comparison, the study conducted by Ibeagwu considered constant temperature boundary conditions for the hourglass shape (referred to as X-shape in that study) has a higher power density than the rectangular shape (Ibeagwu, 2019). Our study shows that other geometries [e.g., trapezoid, Y shape investigated in both our study and (Ibeagwu, 2019)] could result in a greater power output and hence power density if natural convection or forced convection boundary conditions are considered. In fact, convection boundary conditions on the cold side are more typical of the conditions experienced by thermoelectric devices in realistic waste-heat recovery applications.…”

Section: Constant Temperature Hot Side Boundary Conditionmentioning

confidence: 60%

“…Thimont and LeBlanc (2019) found that a trapezoid shape and hollow shapes perform better than the traditional rectangular shape under constant hot side temperature boundary condition. Ibeagwu found an hourglass shape (referred to as X-shape in that study) subjected to hot and cold junction temperatures of 420 and 300 K has 19% higher power output compared to the conventional rectangular leg shape (Ibeagwu, 2019). The rectangular hollow shape performs better than the traditional rectangular shape whereas the multi-hollow rectangular shape has the same performance as the rectangular shape under these boundary conditions.…”

Section: Constant Temperature Hot Side Boundary Conditionmentioning

confidence: 78%

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The Influence of Leg Shape on Thermoelectric Performance Under Constant Temperature and Heat Flux Boundary Conditions

Şişik

LeBlanc

2020

Front. Mater.

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Section: Constant Temperature Hot Side Boundary Conditionmentioning

confidence: 60%

Section: Constant Temperature Hot Side Boundary Conditionmentioning

confidence: 78%

The Influence of Leg Shape on Thermoelectric Performance Under Constant Temperature and Heat Flux Boundary Conditions

Şişik

LeBlanc

2020

Front. Mater.

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“…Secondly, the present numerical model is used to reproduce the works of previous studies 14,40 on similar subjects. To ensure that the model is indeed accurate, the following validation tests are conducted:…”

Section: Validationmentioning

confidence: 99%

“…The power output was also enhanced. Ibeagwu 14 performed numerical modelling on the performance of five-leg geometries using COMSOL Multiphysics. The geometries had rectangular, trapezoidal, I, Y, and X cross-sectional areas.…”

mentioning

confidence: 99%

Solar power generation using a two‐stage X‐leg thermoelectric generator with high‐temperature materials

2021

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Due to the adverse impacts of fossil fuel sources on the environment and human health, research aimed at generating electricity from the sun has gained increased interest. These adverse effects are more pronounced in thirdworld countries, like Nigeria, which rely heavily on fossil fuel sources for power generation. Nevertheless, Nigeria has an abundant supply of solar energy. Thus, the use of solid-state devices, called thermoelectric generators (TEGs), in harvesting solar energy is a very profitable and clean power generation method. However, these devices are characterised by low efficiencies. Previous scholars showed that altering the thermoelectric leg geometry improved device efficiency. It was also demonstrated that using two-stage TEGs improved device performance. Despite the improvements obtained from these recommendations, we notice that a two-stage TEG design that uses an altered/ variable leg geometry configuration has not been designed before. Thus, we present numerical modelling and optimisation of a two-stage TEG with X-leg geometry configuration using isoflux conditions. The optimised parameters are the external load resistance, taper angle of the X-leg and concentration ratio of the solar concentrator. Finally, we consider the effect of using hightemperature materials in a two-stage design.

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“…Threedimensional finite element method was used and results showed that the maximum von Mises stress in the hotsegment decreased by 12.5% compared with a single-Skutterudite annular thermoelectric generator. Ibeagwu [ 44] studied the effect of different leg geometries on the electrical and mechanical performance of a thermoelectric generator and results revealed that thermal stress can be reduced by geometry optimization.…”

mentioning

confidence: 99%

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

Shittu

Xuan

et al. 2020

Energy

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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 fullscale 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 Samson Shittu Writing -review & editing Writing -original draft Validation Software Conceptualization a , Guiqiang Li Project administration Supervision a, *

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Modelling and comprehensive analysis of TEGs with diverse variable leg geometry

Cited by 72 publications

References 21 publications

The Influence of Leg Shape on Thermoelectric Performance Under Constant Temperature and Heat Flux Boundary Conditions

The Influence of Leg Shape on Thermoelectric Performance Under Constant Temperature and Heat Flux Boundary Conditions

Solar power generation using a two‐stage X‐leg thermoelectric generator with high‐temperature materials

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

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