Thermal Stress Analysis of a Segmented Thermoelectric Generator under a Pulsed Heat Source

Yu, Jinling; Kong, Li; Zhu, Qingshan; Zhu, Hongji; Wang, Haoqing; Guan, Jialin; Yan, Qing

doi:10.1007/s11664-020-08163-1

Cited by 14 publications

(3 citation statements)

References 27 publications

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“…The thermal stress governing equation described by the displacement-strain equilibrium relationship is expressed as [45]:…”

Section: Mathematical Equations Of Thermal Stress Analysismentioning

confidence: 99%

Cooling and Mechanical Performance Analysis of a Trapezoidal Thermoelectric Cooler with Variable Cross-Section

Zhang

et al. 2020

Energies

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In this study, a full-scale three-dimensional trapezoidal thermoelectric cooler model is constructed to study its cooling performance and mechanical reliability using finite element simulation. Temperature dependent material properties are considered in this work. The boundary conditions similar to those in a real experimental environment are applied. The effects of the input electrical current and geometry of the thermoelectric leg on the cooling performance and reliability of a trapezoidal thermoelectric cooler are analyzed, and a comparison is made with a rectangular thermoelectric cooler. The results indicate that increasing the leg height and the variable cross-sectional design of the leg can improve the cooling performance of the trapezoidal thermoelectric cooler. Compared to the original rectangular thermoelectric cooler, the minimum chip temperature was reduced by 0.87% under the trapezoidal thermoelectric cooler with optimized geometry. Furthermore, increasing the leg height enhances the mechanical reliability of the trapezoidal thermoelectric cooler, while the trapezoidal design of the leg reduces its mechanical reliability. The maximum von Mises stress of the leg for the trapezoidal thermoelectric cooler with optimal cooling performance increased by 40.1%. The results of this work provide useful guidance for the structural design of trapezoidal thermoelectric coolers.

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“…The thermal stress governing equation described by the displacement-strain equilibrium relationship is expressed as [45]:…”

Section: Mathematical Equations Of Thermal Stress Analysismentioning

confidence: 99%

Cooling and Mechanical Performance Analysis of a Trapezoidal Thermoelectric Cooler with Variable Cross-Section

Zhang

et al. 2020

Energies

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“…In actual flight conditions, the external heat source cannot be constant, which leads to fluctuations in the efficiency and output energy of thermoelectric devices. In addition, excessive stress can reduce the service life of thermoelectric generators [22]. Therefore, more and more researchers have been attracted to the study of the mechanical reliability of structure in recent years [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Nonlinear Transient Energy Effect on Thermoelectric Energy Storage Structure

Zhu

Kong

et al. 2020

Materials

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In complex flight conditions, due to the large amount of unusable heat generated by aerodynamic heating, the thermal protection system of an aircraft needs to withstand a large temperature shock, which brings great challenges to the design of the structure. In order to effectively utilize the irregular aerodynamic heat, and improve structural heat conduction, a composite structure is formed by using phase change energy storage materials on the basis of the thermoelectric structure, which transforms the aerodynamic waste heat into stable electric energy for the internal system. Through the study of the response of nonlinear transient energy, it is found that the thermoelectric and mechanical properties of the new structure can be improved by adding phase change energy storage materials. Under actual flight conditions, the new structure can reduce the maximum temperature by 180 K and the maximum thermal stress by 110 Mpa. The mechanical properties of the structure are effectively improved, the service life of the structure is prolonged, and the waste heat can be converted into stable electrical energy output to improve the thermoelectric output performance. On the premise of ensuring conversion efficiency, the output power of the new structure has been improved by 64.8% through structural optimization under actual flight conditions.

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“…In addition to output performance analysis, the aging effects in TEGs are worth analyzing in the future. Large thermal stress results from thermal expansion mismatch at the junction, severely damaging the lifespan of TEGs [61]. Performance degradation also occurs during working cycles due to increased internal resistance at the joint of different materials in TEGs [62].…”

mentioning

confidence: 99%

Micro/Nanomaterials for Heat Transfer, Energy Storage and Conversion

Sun

Wang

et al. 2022

Coatings

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Thermal Stress Analysis of a Segmented Thermoelectric Generator under a Pulsed Heat Source

Cited by 14 publications

References 27 publications

Cooling and Mechanical Performance Analysis of a Trapezoidal Thermoelectric Cooler with Variable Cross-Section

Cooling and Mechanical Performance Analysis of a Trapezoidal Thermoelectric Cooler with Variable Cross-Section

Analysis of Nonlinear Transient Energy Effect on Thermoelectric Energy Storage Structure

Micro/Nanomaterials for Heat Transfer, Energy Storage and Conversion

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