Thermal Energy Harvesting for Application at MEMS Scale

Percy, Steven

doi:10.1007/978-1-4614-9215-3

Cited by 17 publications

(10 citation statements)

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“…It is shown that in the proposed structure of the thermal MEMS sensor, in contrast to cantilever designs of heat energy harvesters [16,17], it is necessary to provide the reverse order in the sequence of bimorph membrane layers. The material of the layer in contact with the heat source must have a coefficient of thermal expansion less than the material of the second (lower) layer.…”

Section: Analysis Of Processes In the Signal Processing System Of Thementioning

confidence: 99%

Thermal microelectromechanical sensor construction

Kiselev¹,

Krytska²,

Stroiteleva³

et al. 2019

EEJET

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Section: Analysis Of Processes In the Signal Processing System Of Thementioning

confidence: 99%

Thermal microelectromechanical sensor construction

Kiselev¹,

Krytska²,

Stroiteleva³

et al. 2019

EEJET

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“…For alternative power requirements of WSNs in IoTs, energy harvesting 2‐4 from environment is a viable solution. Energies present in the ambient, such as, thermic, 5,6 solar, 7,8 wind 9,10 and acoustic 11,12 have been effectively transformed into electric power with the respective energy harvesters. Moreover, in addition, mechanical kinetic energy and vibration are also abundantly available in domestic, office and industrial environments.…”

Section: Introductionmentioning

confidence: 99%

A vibration‐based electromagnetic and piezoelectric hybrid energy harvester

Khan

2020

Int J Energy Res

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Summary This work presents the fabrication and testing of a vibration‐based single energy hybrid harvester (VSEHH). Electromagnetic and piezoelectric transduction mechanisms are utilized for energy extraction in the developed harvester. Electromagnetic portion of the device composed of a permanent magnet, planar coil and wound coil, however, for piezoelectric portion polyvinylidene difluoride (PVDF) membrane is used. In the harvester the PVDF membrane having the magnet is kept loose in order to exploit the spring softening nonlinearity. At lower base excitation levels (less than 0.5g) the response of the VSEHH is linear, however, from 0.5 to 2.5g the harvester exhibits spring softening nonlinearity and at acceleration levels greater than 2.5g, the spring hardening nonlinearity is invoked. Because of nonlinear behavior of the harvester, the shift of resonant frequency, the sudden jump‐up and jump‐down phenomena result in the enhancement of the harvester's frequency bandwidth. Under sinusoidal excitation and at 123 Hz frequency and 4g acceleration, the electromagnetic portion of the harvester produced 40.6 mV load voltage and 212.7 μW with planar coil and 73.5 mV load voltage and 319.1 μW power with wound coil. Moreover, under the same vibrations condition a load voltage of 2930 mV and power of 57.6 μW is generated by the piezoelectric portion of the harvester. Collectively, the harvester is capable of producing a power of 589.4 μW and a power density of 334.13 μW/cm3. Furthermore, when subjected to broadband random vibrations, two central frequency peaks are produced, one is due to spring softening and the other corresponds to the spring hardening of the membrane.

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“…Shape memory alloys (SMAs) and, in particular, NiTi alloys are arousing growing interest in many industrial, biomedical, and micro-electro-mechanical sectors, thanks to their peculiar functional properties that are known as shape memory (SM) and pseudoelastic (PE) effects. Among the large and increasing number of applications of SMAs, several systems have been designed for the direct conversion of low-enthalpy energy into mechanical energy (Percy et al, 2014). In these systems, which can be defined as SMA-based engines, the energy conversion is obtained from the shape recovery capabilities of SMA elements, typically in the shape of wires or springs, which represent the energy conversion elements.…”

Section: Introductionmentioning

confidence: 99%

A thermo-mechanical model for shape memory alloy–based crank heat engines

Niccoli

Maletta

Sgambitterra

et al. 2014

Journal of Intelligent Material Systems and Structures

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A thermo-mechanical model to simulate the mechanical response of a shape memory alloy heat engine has been developed. In such a kind of engine, the thermally induced shape recovery capabilities of shape memory alloys are exploited to obtain mechanical work from low-grade energies, such as warm wastewater, geothermal, and solar sources. As a consequence, these engines represent simple and environmentally friendly solutions, and several architectures have been proposed in the last years. However, none of these devices has been industrialized, mainly due to the lack of robust design tools as well as to several technological and economic issues. To this aim, a simple semi-empirical numerical model has been developed to analyze the mechanical response of a shape memory alloy-based crank heat engine. In particular, the engine output characteristics (e.g. torque, specific power, efficiency) have been studied as a function of several geometrical configurations (e.g. dimensions, number of cranks) as well as of different thermo-physical properties of the heating and cooling thermal sources.

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Thermal Energy Harvesting for Application at MEMS Scale

Cited by 17 publications

References 0 publications

Thermal microelectromechanical sensor construction

Thermal microelectromechanical sensor construction

A vibration‐based electromagnetic and piezoelectric hybrid energy harvester

A thermo-mechanical model for shape memory alloy–based crank heat engines

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