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    Chapter Managing Heat Transfer Issues in Thermoelectric Microgenerators

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    Author(s)
    Marc, Salleras
    Luis, Fonseca
    Inci, Donmez-Noyan
    Marc, Dolcet
    Joaquin, Santander
    Denise, Estrada-Wiese
    Jose-Manuel, Sojo
    Gerard, Gadea
    Alex, Morata
    Albert, Tarancon
    Language
    English
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    Abstract
    This chapter deals with heat transfer challenges in the microdomain. It focuses on practical issues regarding this matter when attempting the fabrication of small footprint thermoelectric generators (μTEGs). Thermoelectric devices are designed to bridge a heat source (e.g. hot surface) and a heat sink (e.g. ambient) assuring that a significant fraction of the available temperature difference is captured across the active thermoelectric materials. Coexistence of those contrasted temperatures in small devices is challenging. It requires careful decisions about the geometry and the intrinsic thermal properties of the materials involved. The geometrical challenges lead to micromachined architectures, which silicon technologies provide in a controlled way, but leading to fragile structures, too. In addition, extracting heat from small systems is problematic because of the high thermal resistance associated to heat exchanged by natural convection between the surrounding air and small bare surfaces. Forced convection or the application of a cold finger clearly shows the usefulness of assembling a heat exchanger in a way that is effective and compliant with the mechanical constraints of micromachined devices. Simulations and characterization of fabricated structures illustrate the effectiveness of this element integration and its impact on the trade-off between electrical and thermal behavior of the active materials in device performance.
    URI
    https://library.oapen.org/handle/20.500.12657/49392
    Keywords
    thermoelectricity, silicon technology, micromachining, silicon nanowires, heat exchangers
    DOI
    10.5772/intechopen.96246
    Publisher
    InTechOpen
    Publisher website
    https://www.intechopen.com/
    Publication date and place
    2021
    Classification
    Engineering: general
    Rights
    https://creativecommons.org/licenses/by/3.0/
    • Imported or submitted locally

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    License

    • If not noted otherwise all contents are available under Attribution 4.0 International (CC BY 4.0)

    Credits

    • logo EU
    • This project received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 683680, 810640, 871069 and 964352.

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