Thermal energy harvesting device using ferromagnetic materials

Ujihara, M.; Carman, Gregory P.; Lee, D. G.

doi:10.1063/1.2775096

Cited by 164 publications

(121 citation statements)

References 9 publications

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“…For example, when the elastic shuttle beam is place at a low temperature source, temperature of the ferromagnetic material is dropped below the Curie temperature and magnetism occurs. This magnetic force attraction is stronger than the bending spring force of the shuttle beam and the beam bends downwards to the hot bottom plate 15,16 occurs in the field of triboelectricity. As the ferromagnetic material touches the bottom hot source, temperature of ferromagnetic material increases above the Curie temperature and thus rapidly weakens the magnetism.…”

Section: Fundamental Principle Of Mttgmentioning

confidence: 98%

“…Proposed research to combine triboelectric effect with heat energy on new approach MTTG (Magneto-ThermoTriboelectric Generator) is radically differed to the existing method of Thermoelectric Generator (TEG) as MTTG utilizes Magneto-Thermoelectric Generator (MTG) as a base 15,16 . MTG is a method of thermal energy harvesting using active ferromagnetic material in temperature difference environment.…”

Section: Fundamental Principle Of Mttgmentioning

confidence: 99%

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Magneto-Thermo-Triboelectric Generator (MTTG) for thermal energy harvesting

Jang

Lee²,

Lee

2016

SPIE Proceedings

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We present a novel thermal energy harvesting system using triboelectric effect. Recently, there has been intensive research efforts on energy harvesting using triboelectric effect, which can produce surprising amount of electric power (when compared to piezoelectric materials) by rubbing or touching (i.e, electric charge by contact and separation) two different materials together. Numerous studies have shown the possibility as an attractive alternative with good transparency, flexibility and low cost abilities for its use in wearable device and smart phone applications markets. However, its application has been limited to only vibration source, which can produce sustained oscillation with maintaining contact and separation states repeatedly for triboelectric effect. Thus, there has been no attempt toward thermal energy source. The proposed approach can convert thermal energy into electricity by pairing triboelectric effect and active ferromagnetic materials The objective of the research is to develop a new manufacturing process of design, fabrication, and testing of a Magneto-Thermo-Triboelectric Generator (MTTG). The results obtained from the approach show that MTTG devices have a feasible power energy conversion capability from thermal energy sources. The tunable design of the device is such that it has efficient thermal capture over a wide range of operation temperature in waste heat.

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Section: Fundamental Principle Of Mttgmentioning

confidence: 98%

Section: Fundamental Principle Of Mttgmentioning

confidence: 99%

Magneto-Thermo-Triboelectric Generator (MTTG) for thermal energy harvesting

Jang

Lee²,

Lee

2016

SPIE Proceedings

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“…This situation exists despite pioneering advances made over the last fifty years on developing energy harvesters based on thermoelectrics, 1 pyroelectrics, 2,3 ferroelectrics, 4 ferromagnets, [5][6][7] and shape memory metals. 8,9 We here harvest thermal energy as electrical energy by using the newly discovered thermally powered torsional and tensile actuation of artificial muscles made from inexpensive, highly-twisted fishing line or sewing thread.…”

Section: Introductionmentioning

confidence: 96%

Harvesting temperature fluctuations as electrical energy using torsional and tensile polymer muscles

Kim

Lima

Kozlov

et al. 2015

Energy Environ. Sci.

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Diverse means have been deployed for harvesting electrical energy from mechanical actuation produced by low-grade waste heat, but cycle rate, energy-per-cycle, device size and weight, or cost have limited applications. We report the electromagnetic harvesting of thermal energy as electrical energy using thermally powered torsional and tensile artificial muscles made from inexpensive polymer fibers used for fishing line and sewing thread. We show that a coiled 27 μm-diameter nylon muscle fiber can be driven by 16.7 °C air temperature fluctuations to spin a magnetic rotor to a peak torsional rotation speed of 70 000 rpm for over 300 000 heating-cooling cycles without performance degradation. By employing resonant fluctuations in air temperature of 19.6 °C, an average output electrical power of 124 W per kg of muscle was realized. Using tensile actuation of polyethylene-based coiled muscles and alternating flows of hot and cold water, up to 1.4 J of electrical energy was produced per cycle. The corresponding per cycle electric energy and peak power output, per muscle weight, were 77 J kg−1 and 28 W kg−1, respectively. applications. We report the electromagnetic harvesting of thermal energy as electrical energy using thermally powered torsional and tensile artificial muscles made from inexpensive polymer fibers used for fishing line and sewing thread. We show that a coiled 27 mm-diameter nylon muscle fiber can be driven by 16.7 1C air temperature fluctuations to spin a magnetic rotor to a peak torsional rotation speed of 70 000 rpm for over 300 000 heating-cooling cycles without performance degradation. By employing resonant fluctuations in air temperature of 19.6 1C, an average output electrical power of 124 W per kg of muscle was realized. Using tensile actuation of polyethylene-based coiled muscles and alternating flows of hot and cold water, up to 1.4 J of electrical energy was produced per cycle. The corresponding per cycle electric energy and peak power output, per muscle weight, were 77 J kg À1 and 28 W kg À1, respectively. Broader contextLow grade thermal energy from such sources as industrial waste streams, automobiles, and power plants is mostly wasted, since the present cost of recovering this low temperature thermal energy as electrical energy is too high. Improved methods for harvesting low grade thermal energy could provide an important new source of electrical energy, as well as a means to self-power autonomous sensors for the ''Internet of Things''. This initial work shows that artificial torsional and tensile muscles made from inexpensive fishing line and sewing thread can be used to harvest useful amounts of electrical power from lowtemperature waste energy sources. Coiled fibers made from 27 mm-diameter sewing thread generated electrical energy by torsionally rotating a magnetic rotor at speeds exceeding 70 000 rpm. Using an air temperature fluctuation of only 19.6 1C, 124 Watts of electrical energy per kilogram of muscle weight was harvested for possible use for autonomous sensors. By us...

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“…The potential energy sources from ambient energy include solar, thermal, and mechanical vibration (Beeby et al 2006;Hande et al 2007;Ujihara et al 2007). Among them, vibration energy commonly exists in our living environment and thus vibration-based energy harvester has been widely and intensively studied (Sodano et al 2005).…”

Section: Introductionmentioning

confidence: 99%