Semi-flexible bimetal-based thermal energy harvesters

Boisseau, S.; Despesse, Ghislain; Monfray, S.; Puscasu, O.; Skotnicki, T.

doi:10.1088/0964-1726/22/2/025021

Cited by 58 publications

(36 citation statements)

References 21 publications

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“…As the coefficients of thermal expansion for the two metals differ, they elongate at a different rate in response to applied heat leading to a bending moment and thus deformation of the structure. Pre-buckled bimetals can even be used as heat engines due to their thermo-mechanical instability (snap-through energy release) [41,42].…”

Section: Shape Adaptation Actuated By Heat Light Pressure and Chemimentioning

confidence: 99%

Non-Conventional Deformations: Materials and Actuation

Vermes

Czigány

2020

Materials

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This paper reviews materials and structures displaying non-conventional deformations as a response to different actuations (e.g., electricity, heat and mechanical loading). Due to the various kinds of actuation and targeted irregular deformation modes, the approaches in the literature show great diversity. Methods are systematized and tabulated based on the nature of actuation. Electrically and mechanically actuated shape changing concepts are discussed individually for their significance, while systems actuated by heat, pressure, light and chemicals are condensed in a shared section presenting examples and main research trends. Besides scientific research results, this paper features examples of real-world applicability of shape changing materials, highlighting their industrial value.The optimal shape-changing concept always depends on the application. In some cases, we do not want the material to adapt to its environment; instead, we wish to control its deformation actively. In these cases, systems actuated by electricity [5], heat [6] or pressure [7] may be considered. On the other hand, there are situations when environmental adaptation is what we are after to achieve maximum working efficiency of a structural part. In the case of marine or wind turbine blades, for instance, their shape for optimal energy yield depends on the direction and speed of the flowing fluid, i.e., the mechanical loading the blades are subjected to [8]. A mechanically actuated shape-changing material could passively modulate its shape (e.g., twisting) in response to changing loads (e.g., bending moments), resulting in significant efficiency gains.This review aims to introduce some selected shape-changing concepts from the literature categorized by the type of actuation giving an up-to-date overview of this field of research.

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Section: Shape Adaptation Actuated By Heat Light Pressure and Chemimentioning

confidence: 99%

Non-Conventional Deformations: Materials and Actuation

Vermes

Czigány

2020

Materials

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“…The efficiency of the developed engine was evaluated using different types of bimetals. A W ‐ Al bimetal produced the best Carnot‐relative efficiency of 5% with thermal hysteresis of 1 K. Boisseau et al, 6 proposed a curved bimetallic semiflexible device to convert thermal gradients to mechanical oscillation and then to electrical using a coupled Teflon electret transducer. The raw output power ranged up to 13.46 W per device with a 60°C heat energy source and up to 10 W using three devices in parallel.…”

Section: Related Workmentioning

confidence: 99%

Dynamic model of a novel thermogravity rotary actuator for solar energy harvesting

et al. 2020

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Summary The direct conversion of thermal energy to mechanical energy is always been a challenging but demanding problem. In this article, we presented a nonconventional direct conversion mechanism of the readily available solar thermal and gravity energy to rotational mechanical energy. The developed rotating assembly affixed concentrically with a plurality of actuating arms harnesses the integrated solar‐gravity energy. Each actuating arm shifts the center of gravity of the attached solid mass with concentrated solar heating. The alternate shift in the center of gravity of each actuating arm with exposure to solar radiation produces a continuous revolution of rotating assembly around its axis of rotation. With a particular set of the system parameters with Al/Si3N4 bimetallic strip the thermal efficiency of the proposed thermogravity bimetallic strip heat actuator/engine is 12.41% which is 100 times more efficient compared to a gravity‐less thermal engine with same set up. The proposed thermogravity system can generate mechanical power ranges from less than 1 W to 40 kW with a particular set of system parameters. This solar‐gravity rotary actuator is a novel work in this domain which has a huge impact and contribution in the available rotary actuator or energy harvester knowledge.

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“…where A 1i , σ 1i , and σ 2i are arbitrary constants, (λ i /l) 4 = ω 2 i m/Y J , and ω i is the resonant frequency of the ith mode. For the cantilever beam shown in Fig.…”

Section: Appendix: Modal Analysis Of a Cantilever Beam With A Proof Massmentioning

confidence: 99%

“…Energy harvesting is the conversion of ambient energy into a usable form of energy. There are many ways to convert the ambient energies, such as solar, 3 thermal, 4 acoustic, 5 electromagnetic, 6,7 and vibration 8 energies, into electrical energy. For example, vibration energy can be conveniently converted into electrical energy by electrostatic, 9 electromagnetic, 10 piezoelectric, 11 and magnetoelectric 12, 13 energy conversion mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Energy harvesting from electric power lines employing the Halbach arrays

Li²,

Wen³

et al. 2013

Review of Scientific Instruments

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This paper proposes non-invasive energy harvesters to scavenge alternating magnetic field energy from electric power lines. The core body of a non-invasive energy harvester is a linear Halbach array, which is mounted on the free end of a piezoelectric cantilever beam. The Halbach array augments the magnetic flux density on the side of the array where the power line is placed and significantly lowers the magnetic field on the other side. Consequently, the magnetic coupling strength is enhanced and more alternating magnetic field energy from the current-carrying power line is converted into electrical energy. An analytical model is developed and the theoretical results verify the experimental results. A power of 566 μW across a 196 kΩ resistor is generated from a single wire, and a power of 897 μW across a 212 kΩ resistor is produced from a two-wire power cord carrying opposite currents at 10 A. The harvesters employing Halbach arrays for a single wire and a two-wire power cord, respectively, exhibit 3.9 and 3.2 times higher power densities than those of the harvesters employing conventional layouts of magnets. The proposed devices with strong response to the alternating currents are promising to be applied to electricity end-use environment in electric power systems.

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Semi-flexible bimetal-based thermal energy harvesters

Cited by 58 publications

References 21 publications

Non-Conventional Deformations: Materials and Actuation

Non-Conventional Deformations: Materials and Actuation

Dynamic model of a novel thermogravity rotary actuator for solar energy harvesting

Energy harvesting from electric power lines employing the Halbach arrays

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