Piezoelectric and electrostatic bimetal-based thermal energy harvesters

Arnaud, Arthur; Boisseau, S.; Monfray, S.; Puscasu, O.; Despesse, Ghislain; Boughaleb, Jihane; Sanchez, Y.; Battegay, Frédéric; Fourel, Mickaël; Audran, S.; Bœuf, F.; Delamare, Jérôme; Delepierre, Gabriel; Pitone, Gilbert; Skotnicki, T.

doi:10.1088/1742-6596/476/1/012062

Cited by 12 publications

(18 citation statements)

References 4 publications

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“…Substituting Equations (8) and (13) into Equation (1), and Equation (17) into Equation (15) results in the following two coupled governing equations of motion: m eqz + c eqż + k eq z = q 2 2g e C e + m eq g + m eq Y o Ω 2 cos(Ωt)…”

Section: Single-degree-of-freedom (Sdof) Modelmentioning

confidence: 99%

“…However, large softening behavior would prevent the pull-in instability, increase the level of the harvested power, and broaden the bandwidth. These observations give a deeper insight into the behavior of such energy harvesters and are of great importance to the designers of electrostatic energy harvesters.Energies 2019, 12, 4249 2 of 26 new technologies, it becomes viable to harvest power from ambient and aeroelastic vibrations [2-6], thermal energy [7,8], airflow [9][10][11][12], and ocean waves [13].Common energy-harvesting techniques employ piezoelectric [14][15][16][17][18], electromagnetic [19][20][21][22][23], electrostatic [24][25][26][27], and hybrid [28] conversion principles according to the type of application [29]. Electrostatic mechanism has advantages over other mechanisms where it is possible to work at low frequency and wide bandwidth [30].…”

mentioning

confidence: 99%

“…Energies 2019, 12, 4249 2 of 26 new technologies, it becomes viable to harvest power from ambient and aeroelastic vibrations [2-6], thermal energy [7,8], airflow [9][10][11][12], and ocean waves [13].…”

mentioning

confidence: 99%

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Nonlinear Analysis and Performance of Electret-Based Microcantilever Energy Harvesters

Hammad

Abdelmoula²,

Abdel‐Rahman

et al. 2019

Energies

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An energy harvester composed of a microcantilever beam with a tip mass and a fixed electrode covered with an electret layer is investigated when subject to an external harmonic base excitation. The tip mass and fixed electrode form a variable capacitor connected to a load resistance. A single-degree-of-freedom model, derived based on Newton’s and Kirshoff’s laws, shows that the tip mass displacement and charge in the variable capacitor are nonlinearly coupled. Analysis of the eigenvalue problem indicates the influence of the electret surface voltage and electrical load resistance on the harvester linear characteristics, namely the harvester coupled frequency and electromechanical damping. Then, the frequency–response curves are obtained numerically for a range of load resistance, electret voltage and base excitation amplitudes. A softening nonlinear effect is observed as a result of decreasing the load resistance and increasing the electret voltage. It is found that there is an optimal electret voltage with the highest harvested electrical power. Below this optimal value, the bandwidth is very small, whereas the bandwidth is large when the electret voltage is above this optimal value. In addition, it is noted that for a certain excitation frequency, the harvested power decreases or increases as a function of electrical load resistance when the coupled frequency is closer to short- or open-circuit frequency, respectively. However, when the coupled frequency is between the short-circuit and open-circuit frequencies, the harvested power has an optimal resistance with the highest power. Increasing the excitation amplitude to raise the harvested power could be accompanied with dynamic pull-in instability and/or softening behavior depending on the electrical load resistance and electret voltage. However, large softening behavior would prevent the pull-in instability, increase the level of the harvested power, and broaden the bandwidth. These observations give a deeper insight into the behavior of such energy harvesters and are of great importance to the designers of electrostatic energy harvesters.

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Section: Single-degree-of-freedom (Sdof) Modelmentioning

confidence: 99%

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confidence: 99%

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Nonlinear Analysis and Performance of Electret-Based Microcantilever Energy Harvesters

Hammad

Abdelmoula²,

Abdel‐Rahman

et al. 2019

Energies

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“…Due to these drawbacks, new concepts have emerged to harvest waste heat [3][4][5][6][7][8]. Recently, many attempts for realizing MEMS comprising liquid/vapor phase change have been done.…”

Section: Introductionmentioning

confidence: 99%

“…All these studies usually used an additional oscillating media in order to conduct the heat for the oscillations' control. A promising system using a constant source of heat to produce energy had also been reported [1, 7,8]. The system consisted of a bimetal, which can suddenly hit a piezo-electric element in order to produce energy.…”

Section: Introductionmentioning

confidence: 99%

An experimental device designed to obtain repeatable condensation peaks in a closed system

Soupremanien¹,

Ollier²,

Salamon³

et al. 2014

Energy and Sustainability V

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The results of an experimental study related to repeatable condensation peaks in a closed system are presented and a discussion to describe their incipiencies is detailed. The test sections (D1: filling capacity = 15.14 x 1e ) were divided into three parts: an evaporator, an insulator and a conductive top cover where a pressure sensor was inserted. The impacts of several parameters have been studied: devices' filling ratio (α); hot temperature of the evaporator; cooling of the condensation chamber and; the devices' dimension. For all the obtained results the frequencies were low (< 0.15 Hz) but the peak pressure amplitudes were significant (up to 987 mbar). The influence of α had been studied and its increase led to an augmentation of the pressure amplitude (exponential-like function) but to a decrease in the oscillation frequencies. The hot temperature's increase enhanced the oscillation frequency but the pressure amplitude variations were slightly decreased. The cooling level diminution led to a frequency decrease, but to a slight variation of the pressure peak amplitude. Reducing the devices' dimensions from D1 to D2 for the same α and cooling level allowed the increasing of the oscillation frequency without significantly modifying the pressure peaks' amplitude. In a strategy for energy harvesting these oscillation peaks could be converted into electricity using piezo-electrics.

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Exploiting the Potential of Pyroelectric–Piezoelectric Hybrid Devices for Low‐Grade Thermal Energy Harvesting

Gaur,

Saurabh,

Patel

2023

Energy Tech

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This study proposes a separate and combined (pyroelectric + piezoelectric) energy harvesting system using a bimetallic beam. Hybrid energy harvesting is achieved by waste thermal energy using thermal expansion mismatch of the bimetallic beam. In this regard, four types of design are proposed, along with various heating/cooling cycles. Auxetic layers in a bimetallic beam are used to enhance the power. The best‐performing design and heating/cooling cycle are considered for further power increment. Two models are simulated based on low (model C3) and high heat consumption (model C5). The load resistance, frequency, bimetallic beam and pyroelectric/piezoelectric layer thickness are varied and maximum power is obtained at 175 MΩ (C3), 75 MΩ (C5), 0.02 Hz (C3 and C5) and 0.4 mm (C3 and C5) as 20 μW (C3) and 40 μW(C5), respectively. The piezoelectric, pyroelectric and combined power variation is the effect of stress and temperature fluctuations on H‐PEH layer. Additionally, five well‐known higher pyroelectric/piezoelectric coefficient materials are studied and found that La‐NBT‐BT‐Ta gives the maximum power of 0.811 and 1.99 mW for combined (pyroelectric + piezoelectric) effect in low (C3) and high (C5) heat consumption model, respectively. The stress generated in both models is analyzed to look at practical feasibility.

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Piezoelectric and electrostatic bimetal-based thermal energy harvesters

Cited by 12 publications

References 4 publications

Nonlinear Analysis and Performance of Electret-Based Microcantilever Energy Harvesters

Nonlinear Analysis and Performance of Electret-Based Microcantilever Energy Harvesters

An experimental device designed to obtain repeatable condensation peaks in a closed system

Exploiting the Potential of Pyroelectric–Piezoelectric Hybrid Devices for Low‐Grade Thermal Energy Harvesting

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