Thermoelectric Power Generation System Recovering Industrial Waste Heat

Kajikawa, Takenobu

doi:10.1201/9781420038903.ch50

Cited by 20 publications

(13 citation statements)

References 7 publications

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“…Potential fuel efficiency enhancement by recovering the waste heat is beneficial for automobiles and many other applications (1,2). In addition, solar thermoelectric generator provides an alternative route to convert solar energy into electrical power besides the photovoltaic conversion (3).…”

Section: ·Kmentioning

confidence: 99%

n-type thermoelectric material Mg ₂ Sn _0.75 Ge _0.25 for high power generation

Liu

Kim

Chen

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

199

131

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Thermoelectric power generation is one of the most promising techniques to use the huge amount of waste heat and solar energy. Traditionally, high thermoelectric figure-of-merit, ZT, has been the only parameter pursued for high conversion efficiency. Here, we emphasize that a high power factor (PF) is equivalently important for high power generation, in addition to high efficiency. A new n-type Mg 2 Sn-based material, Mg 2 Sn 0.75 Ge 0.25 , is a good example to meet the dual requirements in efficiency and output power. It was found that Mg 2 Sn 0.75 Ge 0.25 has an average ZT of 0.9 and PF of 52 μW·cm ·K−2 over the temperature range of 25-450°C, a peak ZT of 1.4 at 450°C, and peak PF of 55 μW·cm·K −2 at 350°C. By using the energy balance of one-dimensional heat flow equation, leg efficiency and output power were calculated with T h = 400°C and T c = 50°C to be of 10.5% and 6.6 W·cm −2 under a temperature gradient of, respectively.thermoelectrics | magnesium | tin | power factor | output power T hermoelectric power generation from waste heat is attracting more and more attention. Potential fuel efficiency enhancement by recovering the waste heat is beneficial for automobiles and many other applications (1, 2). In addition, solar thermoelectric generator provides an alternative route to convert solar energy into electrical power besides the photovoltaic conversion (3). Thermoelectric generator (TEG) can be regarded as a heat engine using electrons/holes as the energy carrier. The conversion efficiency of a TEG is related to the Carnot efficiency and the material's average thermoelectric figure of merit ZT (4):where ZT = (S 2 σ/κ)T, and S, σ, κ, and T are Seebeck coefficient, electrical conductivity, thermal conductivity, and absolute temperature, respectively. Pursuing high ZT has been the focus of the entire thermoelectric community by applying various phonon engineering via nanostructuring approaches to reduce the thermal conductivity (5-7), or by exploring new compounds with intrinsically low thermal conductivity, such as compounds having complex crystalline structure, local rattlers, liquid-like sublattice, and highly distorted lattice (8-11). However, for practical applications, efficiency is not the only concern, and high output power density is as important as efficiency when the capacity of the heat source is huge (such as solar heat), or the cost of the heat source is not a big factor (such as waste heat from automobiles, steel industry, etc.). The output power density ω is defined as the output power W divided by the cross-sectional area A of the leg, i.e., ω = W/A, which is related to power factor PF = S 2 σ by the following:Eq. 2 contains two main parts: square of the temperature difference divided by leg length, and material power factor PF = S 2 σ.Clearly, to achieve higher power density for a given heat source, we have to either increase the power factor PF or decrease the leg length. However, decreasing the leg length could cause severe consequences such as increase of large heat flux that will incr...

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Section: ·Kmentioning

confidence: 99%

n-type thermoelectric material Mg ₂ Sn _0.75 Ge _0.25 for high power generation

Liu

Kim

Chen

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

199

131

View full text Add to dashboard Cite

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“…Thermoelectric modules can reduce the environmental impacts of industrial and automobile CO 2 emissions by using the heat as fuel for the generation of electric power. [1][2][3] The maximum conversion efficiency h max of a thermoelectric module depends on two factors, the Carnot efficiency and the average thermoelectric figure of merit ZT = Z (T h + T c )/2, where T h is the hot-side temperature and T c is the cold-side temperature; h max can be expressed as 4…”

Section: Introductionmentioning

confidence: 99%

Excessively Doped PbTe with Ge-Induced Nanostructures Enables High-Efficiency Thermoelectric Modules

Jood

Ohta

Yamamoto

et al. 2018

Joule

210

164

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To grow the thermoelectric market, the module development must be at par with the advancements in the materials development. In this work, we successfully bridge the two by developing high-ZT (1.9) PbTe-based thermoelectric material and using this material in thermoelectric module development, leading to a record high efficiency of 12%. The ZT was enhanced through nanostructuring and engineered doping. The high-efficiency module will pave the way for many new opportunities for thermoelectric power generation in commercial applications.

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“…Thermoelectric technology is currently spreading across many application areas such as power generation from waste heat (Kajikawa, 2006), thermoelectric systems in the automotive industry (Matsubara and Matsuura, 2006), as well as being applied to space missions (Abelson, 2006) and for cooling electronic components (Semenyuk, 2006). Therefore, this article describes the development of a thermoelectric module made of non-standard p-n semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Modelling and simulation of a thermoelectric structure with pellets of non-standard geometry and materials

Villasevil

López

Fisac

2013

International Journal of Refrigeration

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Available online xxxThe aim of this paper is to develop and manufacture a thermoelectric structure operating in Peltier mode with non-standard materials, using a Finite Element Model. Thus, both the reliability of the Finite Element Model and the correct development and design of the new thermoelectric structure are ascertained, achieving a dual goal of our research group. This work provides a very good correlation between simulated and experimental results, and corroborates that the material's performance has a decisive influence on the thermoelectric properties of the structure in the temperature range of study considered.

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Thermoelectric Power Generation System Recovering Industrial Waste Heat

Cited by 20 publications

References 7 publications

n-type thermoelectric material Mg ₂ Sn _0.75 Ge _0.25 for high power generation

n-type thermoelectric material Mg ₂ Sn _0.75 Ge _0.25 for high power generation

Excessively Doped PbTe with Ge-Induced Nanostructures Enables High-Efficiency Thermoelectric Modules

Modelling and simulation of a thermoelectric structure with pellets of non-standard geometry and materials

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Thermoelectric Power Generation System Recovering Industrial Waste Heat

Cited by 20 publications

References 7 publications

n-type thermoelectric material Mg 2 Sn 0.75 Ge 0.25 for high power generation

n-type thermoelectric material Mg 2 Sn 0.75 Ge 0.25 for high power generation

Excessively Doped PbTe with Ge-Induced Nanostructures Enables High-Efficiency Thermoelectric Modules

Modelling and simulation of a thermoelectric structure with pellets of non-standard geometry and materials

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Product

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n-type thermoelectric material Mg ₂ Sn _0.75 Ge _0.25 for high power generation

n-type thermoelectric material Mg ₂ Sn _0.75 Ge _0.25 for high power generation