Direct contact thermoelectric generator (DCTEG): A concept for removing the contact resistance between thermoelectric modules and heat source

Kim, Tae Young; Negash, Assmelash; Cho, Gyubaek

doi:10.1016/j.enconman.2017.03.041

Cited by 66 publications

(22 citation statements)

References 17 publications

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“…Schematic of a typical thermoelectric device [17] This planar architecture is the most widely used and marketed, compared to other special module designs, which are designed according to specific technical requirements of the research project, such as the module in cylindrical, flexible, thin or thick film shape [18]. Another more relevant configuration is the Direct Contact Thermoelectric Generator (DCTEG), which decreases the overall thermal module resistance by the direct contact of the TE elements with the exchange media [19] [20].…”

Section: Ii1 Thermoelectric Generator Tegmentioning

confidence: 99%

The Potential of Solar Thermoelectric Generator STEG for Implantation in the Adrar Region

Zoui

Bentouba

Bourouis

2020

AJRESD

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Asolar thermoelectric generator STEG is a system similar to photovoltaics in the specificity of converting solar energy directly into electrical energy without the need for a mechanical transaction. However, compared to photovoltaics, its introduction into large-scale solar power generation has never been achieved, largely due to the low efficiency of the main component of STEG, the thermoelectric TE module. In contrast to other sectors where TE technology is emerging and growing a rapid development that consequently leads to the discovery of new materials, more TE efficient and adapted design engineering. From this reality, STEG has the potential to become a competing alternative technology to the dominant solar photovoltaic systems, especially in hot regions where the PV system suffers from the progressive and precocious degradation of its original properties, leading to a decrease in lifetime and efficiency due to thermal fatigue caused by the excessive heating of the cells by solar infrared radiation that is useless for PV conversion. The concrete example of our study is in Adrar region (south-west Algeria) which is among the hottest and sunniest areas in the world. A selective analysis of the most suitable STEG system for the Adrar region is proposed, based on state-of-the-art data of STEG systems realized and simulated in the scientific literature

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Section: Ii1 Thermoelectric Generator Tegmentioning

confidence: 99%

The Potential of Solar Thermoelectric Generator STEG for Implantation in the Adrar Region

Zoui

Bentouba

Bourouis

2020

AJRESD

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“…Therefore, TE miniaturization via MEMS has become common [10][11][12][13][14]. However, there are still many problems that limit their performance, such as the material properties, the reduced contact resistance between the materials and metal electrodes, and the preparation and arrangement of TE arm arrays with high-aspect ratios [15,16]. Therefore, while developing low-dimensional TE materials, optimizing the device structure and improving integration of the TE arms are keys to improving the micro-TE performance [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Bi-Te Thin Films on Silicon Wafer and Micro-Column Arrays on Microporous Glass Template

Guo

et al. 2020

Nanomaterials

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Electrodeposition is an important method for preparing bismuth telluride (Bi2Te3)-based thermoelectric (TE) thin films and micro-column arrays. When the concentrations of Bi:Te in electrolytes were 3 mM:4 mM, the TE films satisfied the Bi2Te3 stoichiometry and had no dependence on deposition potential. With increasing over-potential, crystal grains changed from lamellar structures with uniform growth directions to large clusters with staggered dendrites, causing a decrease in the deposition density. Meanwhile, the preferred (110) orientation was diminished. The TE film deposited at −35 mV had an optimum conductivity of 2003.6 S/cm and a power factor of 2015.64 μW/mK2 at room temperature due to the (110)-preferred orientation. The electrodeposition of TE micro-columns in the template was recently used to fabricate high-power micro-thermoelectric generators (micro-TEG). Here, microporous glass templates were excellent templates for micro-TEG fabrication because of their low thermal conductivity, high insulation, and easy processing. A three-step pulsed-voltage deposition method was used for the fabrication of micro-columns with large aspect ratios, high filling rates, and high density. The resistance of a single TE micro-column with a 60 μm diameter and a 200 μm height was 6.22 Ω. This work laid the foundation for micro-TEG fabrication and improved performance.

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“…The first situation is when the TEG module is directly in contact with the heat source and absorbs heat energy from the heat source and converts the output into electrical energy. Kim, T. Y. et al exposed the hot side of TEG module directly to the hot exhaust gas served by a diesel engine, achieving a 43-watt power and 2.0 percent energy conversion efficiency [9]. Zhao, Y. et al chose wet flue gas as the heat source and performed thermoelectric energy conversion through direct contact between the TEG and wet flue gas, proving that the maximum output power can also This work is licensed under a Creative Commons Attribution 4.0 License.…”

Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of Thermoelectric Energy Conversion Systems for Heat Recovery With and Without a Water-Cooling Thermal Energy Adjustment Structure

Zhang

et al. 2020

IEEE Access

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The stable exchange of energy and the effective conduction of heat are particularly critical to ensuring the stable operation of thermoelectric components in entire thermoelectric conversion processes. Poor heat exchange and conduction will cause thermal energy in a thermoelectric system to accumulate, leading to the consequence of burning the energy conversion modules. To solve these problems, a thermoelectric energy conversion system equipped with a water-cooling thermal energy adjustment structure settled on the surface of the heat source was proposed. The working temperature of the heat source, the output voltage, current, and power of the thermoelectric system with and without the structure were obtained and compared. Through comparative analysis, benefiting from the above structure, the temperature fluctuation of the heat sink surface of the heat source was found to drop from 10.36 K to 1.18 K, and the maximum output of the system increased from 255 to 290 mV through the process of input voltage from 1 to 6 V. Furthermore, in the process of gradually increasing the load from 0 to 180 ohms, the system achieves an increased output of 53.8 mV, 1.81 mA and 52.1 mV, 1.83 mA when the input voltage was 4 and 5 V, respectively. In conclusion, the application and design of the above structure obviously promotes the stability and output capacity during thermoelectric energy conversion. The combination of the watercooling thermal energy adjustment structure with pulse-width modulation (PWM) or maximum power point tracking (MPPT) theory is worth further study. INDEX TERMS Energy conversion, heat recovery, thermoelectric system, water-cooling.

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Direct contact thermoelectric generator (DCTEG): A concept for removing the contact resistance between thermoelectric modules and heat source

Cited by 66 publications

References 17 publications

The Potential of Solar Thermoelectric Generator STEG for Implantation in the Adrar Region

The Potential of Solar Thermoelectric Generator STEG for Implantation in the Adrar Region

Electrodeposition of Bi-Te Thin Films on Silicon Wafer and Micro-Column Arrays on Microporous Glass Template

Comparative Evaluation of Thermoelectric Energy Conversion Systems for Heat Recovery With and Without a Water-Cooling Thermal Energy Adjustment Structure

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