Geometry optimization for structural reliability and performance of a thermoelectric generator

Karri, Naveen K.; Mo, Changki

doi:10.1007/s42452-019-1120-1

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…Numerous studies have already shown how the performance and of TEGs can be significantly increased by optimizing their geometry. [63][64][65] If temperature distribution of the presented TEG can be modeled adequately, this will prospectively allow an individual optimization. Figure 9 shows a comparison of the expected temperature distribution of an FEM simulation (Figure 9A) and the real temperature distribution measured by IR-Cam (Figure 9B) for steady state conditions under free convection.…”

Section: Resultsmentioning

confidence: 99%

“…The geometry of the modules determines the size of this gradient. Numerous studies have already shown how the performance and efficiency of TEGs can be significantly increased by optimizing their geometry 63–65 . If the temperature distribution of the presented TEG can be modeled adequately, this will prospectively allow an individual optimization.…”

Section: Resultsmentioning

confidence: 99%

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Experimental application of a laser‐based manufacturing process to develop a free customizable, scalable thermoelectric generator demonstrated on a hot shaft

Abt

Kruppa

Wolf

et al. 2022

Engineering Reports

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Geometry, design, and processing in addition to the thermoelectric material properties have a significant influence on the economic efficiency and performance of thermoelectric generators (TEGs). While conventional BULK TEGs are elaborate to manufacture and allow only limited variations in geometry, printed TEGs are often restricted in their application and processing temperature due to the use of organic materials. In this work, a proof‐of‐concept for fabricating modular, customizable, and temperature‐stable TEGs is demonstrated by applying an alternative laser process. For this purpose, low temperature cofired ceramics substrates were coated over a large area, freely structured and cut without masks by a laser and sintered to a solid structure in a single optimized thermal post‐processing. A scalable design with complex geometry and large cooling surface for application on a hot shaft was realized to prove feasibility. Investigations on sintering characteristics up to a peak temperature of 1173 K, thermoelectric material properties and temperature distribution were carried out for a Ca3Co4O9/Ag‐based prototype and evaluated using profilometer, XRD, and IR measurements. For a combined post‐processing, an optimal sintering profile could be determined at 1073 K peak temperature with a 20 min holding time. Temperature gradients of up to 100 K could be achieved along a thermocouple. A single TEG module consisting of 12 thermocouples achieved a maximum power of 0.224 μW and open‐circuit voltage of 134.41 mV at an average hot‐side temperature of 413.6 K and temperature difference of 106.7 K. Three of these modules combined into a common TEG with a total of 36 thermocouples reached a maximum power of 0.58 K and open‐circuit voltage of 319.28 mV with a lesser average hot‐side temperature of 387.8 K and temperature difference of 83.4 K.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Experimental application of a laser‐based manufacturing process to develop a free customizable, scalable thermoelectric generator demonstrated on a hot shaft

Abt

Kruppa

Wolf

et al. 2022

Engineering Reports

View full text Add to dashboard Cite

show abstract

“…New materials and production methods have been the focus of recent research for thermoelectric device improvement [20,21]. Others have studied what causes thermoelectric modules to degrade and fail, and they have provided solutions to these problems [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Reclaim of Wrecked Bi-Te Based Materials In Peltier Modules In Thermopower Properties By Mechanical Milling

Mehmet

Yüzüak

2023

Cumhuriyet Science Journal

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We thoroughly evaluated the effects of various treatments on the structural and electrical properties of the two as-cast materials, “Sb-doping Bi-Te (p-type)” and “Se-doping Bi-Te (n-type)” which are frequently present in abandoned Peltier modules. To investigate the thermoelectric properties of Bi2Te3-based materials, waste alloys characterized by electrical conductivity using the hot-end method. Alloys were purified by performing arc melting on a water-cooled copper crucible in a vacuum of at least 10-3 mbar, with five times melting sessions to assure homogeneity. A single and long milling period of 144 hours is applied. After the compressing operation, the resulting discs with nanostructures were annealed for an hour at 600 K under vacuum conditions. The discs' structural properties were characterized using X-ray diffraction (XRD) and their surfaces and stoichiometries were determined using scanning electron microscopy with an energy dispersive feature. The Seebeck coefficient of the nanoparticle formed n-type Bi-Te based sample is -35.3 µV.K-1 and p-type Bi-Te based sample is 100 µV.K-1 (15% of mean error margin). It was found that a notable improvement was attained in comparison to the initial state with the addition of nanoparticles.We thoroughly evaluated the effects of various treatments on the structural and electrical properties of the two as-cast materials, “Sb-doping Bi-Te (p-type)” and “Se-doping Bi-Te (n-type)”, which are frequently present in abandoned Peltier modules. To investigate the thermoelectric properties of Bi2Te3-based materials, waste alloys were produced and separated by electrical conductivity using the hot-end method. The alloys were purified by performing arc melting on a water-cooled copper crucible in a vacuum of at least 10-3 mbar, with 5 times melting sessions to assure homogeneity. A ball-milled procedure was used to reduce the obtained mass-scale materials to nano sizes. Single and long milling period of 144 hours is applied. After the compressing operation, the resulting discs with nano-structures were annealed for an hour at 600 K in a vacuum. X-ray diffraction was used to characterize the discs' structures, while scanning electron microscopy and energy dispersive X-ray spectroscopy were used to examine the discs' surfaces and determine their morphologies. Based on thermal imaging camera scans and Si-diode, we know that the Seebeck coefficient of the nanoparticle formed n-type Bi-Te based sample is -35.37 V.K-1, while that of the nanoparticle formed p-type Bi-Te based sample is 100.05 V.K-1 (15% of mean error margin). It was found that a notable improvement was attained in comparison to the initial state with the addition of nanoparticles.

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Thermo-mechanical optimization of thermoelectric generators using deep learning artificial intelligence algorithms fed with verified finite element simulation data

Maduabuchi¹

2022

Applied Energy

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Geometry optimization for structural reliability and performance of a thermoelectric generator

Cited by 6 publications

References 28 publications

Experimental application of a laser‐based manufacturing process to develop a free customizable, scalable thermoelectric generator demonstrated on a hot shaft

Experimental application of a laser‐based manufacturing process to develop a free customizable, scalable thermoelectric generator demonstrated on a hot shaft

Reclaim of Wrecked Bi-Te Based Materials In Peltier Modules In Thermopower Properties By Mechanical Milling

Thermo-mechanical optimization of thermoelectric generators using deep learning artificial intelligence algorithms fed with verified finite element simulation data

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