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Coupling of piezo- and pyro-electric effects in miniature thermal energy harvesters

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  • Kang, Miwon
  • Yeatman, Eric M.

Abstract

Thermal energy harvesting from ambient heat into electricity is of interest due to its wide potential applicability. This paper demonstrates a moving beam thermal energy harvesting mechanism exploiting both pyro- and piezo-electric effects simultaneously, for use adjacent to a heat source with small temperature variations at low frequency (below 0.1 Hz). For the first time, the relative contributions of these two mechanisms in such a device is established both theoretically and experimentally, and a dynamic model is provided. The relative phase of the contributed currents is shown to be a critical factor, and methods are introduced to optimise this phase relationship, particularly by selection of the mechanical configuration. The reported prototype achieves around 0.4 μW for a temperature difference of around 15 K at frequency 0.02 Hz with an optimal condition in the fixed-fixed configuration about 90% above the fixed-free end configuration.

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  • Kang, Miwon & Yeatman, Eric M., 2020. "Coupling of piezo- and pyro-electric effects in miniature thermal energy harvesters," Applied Energy, Elsevier, vol. 262(C).
    • Handle: RePEc:eee:appene:v:262:y:2020:i:c:s0306261920300088
    DOI: 10.1016/j.apenergy.2020.114496
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    References listed on IDEAS

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    Cited by:

    1. Ebrahimian, Fariba & Kabirian, Zohre & Younesian, Davood & Eghbali, Pezhman, 2021. "Auxetic clamped-clamped resonators for high-efficiency vibration energy harvesting at low-frequency excitation," Applied Energy, Elsevier, vol. 295(C).
    2. Liu, Huicong & Fu, Hailing & Sun, Lining & Lee, Chengkuo & Yeatman, Eric M., 2021. "Hybrid energy harvesting technology: From materials, structural design, system integration to applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).

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