Some experiments and considerations on the behavior of thermomagnetic motors

Murakami, K.; Nemoto, Masaaki

doi:10.1109/tmag.1972.1067406

Cited by 37 publications

(12 citation statements)

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“…Passive thermomagnetic energy harvesters, however, can be made to operate with heat sources at constant temperature. Some of the thermomagnetic motors reported in the literature are Van Der Mass and Purvis’s Curie point motor [173], Murakami and Nemoto’s rotary thermomagnetic motor [174], Takahashi’s thermomagnetic engine [175,176], and Palmy’s floating thermomagnetic wheel [177,178]. Figure 20 shows the conceptual model of a thermomechanical actuator presented by Ujihara et al [179].…”

Section: Thermomagnetic Energy Harvestingmentioning

confidence: 99%

A Review on Low-Grade Thermal Energy Harvesting: Materials, Methods and Devices

2018

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Combined rejected and naturally available heat constitute an enormous energy resource that remains mostly untapped. Thermal energy harvesting can provide a cost-effective and reliable way to convert available heat into mechanical motion or electricity. This extensive review analyzes the literature covering broad topical areas under solid-state low temperature thermal energy harvesting. These topics include thermoelectricity, pyroelectricity, thermomagneticity, and thermoelasticity. For each topical area, a detailed discussion is provided comprising of basic physics, working principle, performance characteristics, state-of-the-art materials, and current generation devices. Technical advancements reported in the literature are utilized to analyze the performance, identify the challenges, and provide guidance for material and mechanism selection. The review provides a detailed analysis of advantages and disadvantages of each energy harvesting mechanism, which will provide guidance towards designing a hybrid thermal energy harvester that can overcome various limitations of the individual mechanism.

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Section: Thermomagnetic Energy Harvestingmentioning

confidence: 99%

A Review on Low-Grade Thermal Energy Harvesting: Materials, Methods and Devices

2018

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“…[148,149] In 1972, an unusual experimental study on a thermomagnetic wheel with permanent magnets was conducted by Murakami and Nemoto. [150] The topic was again revisited in the 1980s, with several researchers showing interest in it. For example, magnetocaloric power generation using static solid working materials was investigated in 1984 by Kirol and Mills, [151] and in 1988 by Solomon.…”

Section: Journey Through the History Of Magnetocaloricsmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

359

156

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The need for energy‐efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up‐to‐date account of the energy‐related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

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“…However, Murakami and Nemoto [11] published their work on experiments and considerations on the behaviour of thermomagnetic motors in 1972. Later, in the 1980s, Kirol [12,13] and Salomon [14] investigated magnetocaloric power generators with solid working materials.…”

Section: Review Of Magnetocaloric Power Generationmentioning

confidence: 99%

“…(4) magnetic field application (0 by immersion of magnetocaloric material, 1 by fields composition of moving magnets, 2 by switching on/off electromagnets), (5) number of layers in magnetocaloric regenerators (number of different magnetocaloric material layers with different Curie temperatures), (6) magnetocaloric regenerators structure (0 for ordered: calibrated spheres, plates, wires, sheets, honeycomb; 1 for disordered: random spheres, powder, fibres, porous matrix; 2 for magnetocaloric fluid: ferrofluid, particle suspension; 3 for magnetocaloric material with thermal diodes), (7) working fluid (0 for liquid, 1 for gas, 2 for any phase-change fluid), (8) pumping system (0 for bi-directional; 1 for uni-directional), (9) relative motion between the magnetocaloric material and magnet (0 for no motion, 1 for motion), (10) relative motion between the magnetocaloric material and magnet (0 for static magnetocaloric material, 1 for moving magnetocaloric material), (11) relative motion between the magnetocaloric material and magnet (0 for linear, 1 for rotational, 2 for static device) and (12) relative motion between the magnetocaloric material and magnet (0 for discontinuous bi-directional, 1 for discontinuous uni-directional; 2 for continuous).…”

mentioning

confidence: 99%

Design Issues and Future Perspectives for Magnetocaloric Energy Conversion

Kitanovski

Tušek

Tomc

et al. 2014

Magnetocaloric Energy Conversion

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This chapter provides information about the design characteristics for particular types of magnetic refrigerators and heat pumps. The sections therefore indicate the different categories to which a particular magnetocaloric device can belong. For these we show the different design configurations. These are related to linear devices that are based on the linear movement of a magnetic field source or magnetocaloric material; rotary devices, which are based on the rotation of the magnetic field source or the rotation of the magnetocaloric material; and static magnetocaloric devices. Some of the configurations were already applied in research. However, we also present a few new solutions, which are based on our research experiences and which might be applied in future studies and related devices. We again address the importance of the thermal diode mechanism in combination with the active magnetic regeneration (AMR) principle. In addition, a note on power generation is added, with a brief review of the existing work in this particular domain. By pointing out the most successful design approaches, this chapter also serves as a future guideline on the magnetic refrigeration and heat pumping.Since the magnetocaloric devices will, in the following decade, most probably start to penetrate some market niches, it is important, before starting, to address the standardization (or classification) issue relating to magnetocaloric energy conversion. Only a few studies have been performed in this particular and very important domain. However, the research community in the field of magnetocaloric energy conversion decided to enter such a standardization process.For instance, for devices, Scarpa et al. in 2012 [1] proposed a classification method for room-temperature magnetic refrigerators. They proposed a classification of magnetic refrigerators using 12 different criteria, marked by the numbers 1-12. Here, we denote these; however, we marked in bold a slight addition and changes that we think should be included or modified in such a classification.(1) Device type (0 for single-stage cycle without regeneration, 1 for passive regeneration, 2 for active regeneration), (2) magnet type (0 for permanent, 1 for electromagnet), (3) type of permanent magnets (0 for simple magnets, 1 for 2D magnets with Halbach principle, 2 for 3D magnets with Halbach principle),

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Some experiments and considerations on the behavior of thermomagnetic motors

Cited by 37 publications

References 0 publications

A Review on Low-Grade Thermal Energy Harvesting: Materials, Methods and Devices

A Review on Low-Grade Thermal Energy Harvesting: Materials, Methods and Devices

Energy Applications of Magnetocaloric Materials

Design Issues and Future Perspectives for Magnetocaloric Energy Conversion

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