Development of a High-Efficiency Conduction Cooling Technology for SMES Coils

Nagàya, Shigeo; Hirano, Naoki; Naruse, M.; Watanabe, T.; Tamada, T.

doi:10.1109/tasc.2012.2235751

Cited by 37 publications

(10 citation statements)

References 4 publications

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“…Temperature stability was confirmed since there was no increase in temperature due to charging and discharging under these operation conditions. 5) 4.4 Development of the light-duty refrigerator with inverter control The refrigeration load varies significantly depending on the operation period or stand-by period in the SMES system. However, the conventional refrigerator cannot change its refrigeration capacity.…”

Section: Cooling Technology Of the Oxide Seriesmentioning

confidence: 99%

Development of cooling technologies for SMES

2016

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A superconducting magnetic energy storage (SMES) system has good characteristics as energy storage equipment in electric power systems such as high efficiency, quick response, no deterioration in repetition operation, and so on. Since 1991, the Agency for National Resources and Energy Japan has carried out a national project to develop an SMES for power control in power systems. Moreover, SMES has been developed to bridge for instantaneous voltage dips since 2003. A field test of 5 MVA SMES for bridging instantaneous voltage dips was carried out on an advanced large liquid crystal TV plant in Kameyama from July 2003. Before that, a 10 MVA SMES system was working there. After the field test, the commercial SMES for instantaneous voltage dips is working there. In 2015, three commercial SMES units for bridging instantaneous voltage dips are operating in Japan. These SMESs are all equipped with metal superconducting coils. When considering cost-reduction, size-reduction, and maintenance of the SMES in the future, it is necessary to develop a SMES with a high-temperature superconductor and improve the efficiency of its cooling system. We have also developed and conducted operation tests of SMES with a Bi2212 oxide superconductor and high performance cryocooler which enable energy conservation operation by inverter control. In this paper, developed results on cooling systems and cryocooler for SMES are presented.

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Section: Cooling Technology Of the Oxide Seriesmentioning

confidence: 99%

Development of cooling technologies for SMES

2016

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“…The phenomenon is shortly summarized as two fundamental features: (I) exactly zero electrical resistivity at a certain lower temperature defined as critical transition temperature and (I) expulsion of magnetic flux fields at certain applied magnetic fields [2]. During more than a century later, the researchers have endeavored to improve their characteristic properties such as the electrical, superconducting, crystal structure, flux pinning, morphological, and especially mechanical performance and characterization so that the materials can be used in much more application fields [3][4][5][6][7][8][9][10]. Among the characteristic features, the mechanical performance is the most important aspect of every application area such as the metallurgical, technological, engineering and industrial fields for the Bi-based superconducting materials [11].…”

Section: Introductionmentioning

confidence: 99%

A VALUABLE VIEW ON EVALUATION OF GENERAL MECHANICAL PERFORMANCES PERTAINING TO Bi-2223 SUPERCONDUCTING CERAMICS WITH VANADIUM ADDITION

Soykan

Valiyeva

2020

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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In this research, our scientific group investigates the effect of vanadium addition in the Bi-2223 superconducting matrix on the general mechanical performance features by the help of experimental microhardness measurements conducted by a small indenter between the well-defined stress loads of 0.245 N and 2.940 N. Moreover, we determine the key mechanical design parameters including the elastic moduli with the hardness, stiffness coefficients, fracture toughness, yield strength, brittleness index and its opposite behavior (ductility) in the applied test loads given using the experimental data deduced from the microindentation tests. According to the experimental findings, it is oberved that the presence of vanadium content in the Bi-2223 crystal structure surpasses seriously the general mechanical performance and related parameters due to the degradation in the quality of grain boundary couplings, crystal structure and basic structural quantities as a consequence of the increment in the structural problems, permanent plastic deformations, crack-producing flaws and dislocations. In other words, the augmentation of vanadium compounds in the Bi-2223 superconducting lattice brings about the considerable enlargement in the responsibility to the static indentation loads. Namely, the sensitive level to the applied loads increases rapidly with the vanadium concentration. We also search the variation of graphs between the Vickers hardness parameters and applied test loads. In this respect, all the materials prepared in this work exhibit the standard ISE (indentation size effect) characteristics but within the decrement trend as the vanadium content level increases. In more detail, the impurity atoms damage harshly the ISE feature of Bi-2223 type-II superconducting ceramics. Additionally, we discuss the change of plateau limit regions coincided with the permeant artificial structural problems in the graphics. The vanadium leads to shorten the applied test load values for the plateau limit regions of Bi-2223 materials, stemmed from the enhancement the general structural problems. To conclude, the vanadium inclusions are ploughed to improve the general mechanical performance features and key mechanical design parameters.

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“…At the same time, the second term of perfect diamagnetism has directly attracted great attention of the scientists for the usages of metallurgical and materials science engineering, power transmission, magnetic separation, motors, transformers, refrigeration, electro-optic, generators, particle accelerators, spintronics, innovative energy infrastructure sectors, future hydrogen society, medicine areas, levitated trains, imaging technology, sensitive process control, electric power cable, magnetic energy storage, heavy-industrial technology and large-scale areas application fields [2][3][4][5][6][7][8]. As well known that according to the magnetic carrying characteristics, the superconducting materials are differentiated into two types: Type-I and Type-II.…”

Section: Introductionmentioning

confidence: 99%

EXAMINATION OF VANADIUM EFFECT ON GENERAL MECHANICAL CHARACTERISTICS OF Bi-2223 MATERIALS VIA SEMI-EMPIRIC MODELS

Soykan

Valiyeva

2020

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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In the current work, we semi-empirically investigate the load-independent Vickers hardness values of vanadium added Bi-2223 compounds in the plateau limit regions evaluated from the experimental microhardness graphics (Vickers hardness parameters versus applied indentation test loads) to determine the role of vanadium particles on the general mechanical characteristics with the aid of six mechanical modeling approaches, namely law of Meyer, proportional sample resistance, elastic/plastic deformation, modified proportional sample resistance, Hays-Kendall and indentation-induced cracking models. Throughout the study, the samples are prepared with the different molar rations varying from x=0 to 0.3 by the conventional ceramic method in the normal atmospheric pressure at the room temperature conditions. All the model findings show that the mechanical performances tend to constantly reduce with increasing the vanadium concentration level embedded in the Bi-2223 superconducting crystal system. This is in accordance to the fact that the concentration level of vanadium remarkably damages the main structural problems and permanent irreversible deformations. In this respect, it is not wrong to verify that the vanadium inclusions unstabilize the inherit durable tetragonal phase of Bi-2223 inorganic solids, resulting in the regression in the mechanical durability (resistance towards to the applied loads) in case of the applied test loads. Moreover, the models indicate that every material prepared exhibits the conventional indentation size effect (related to the formation of elastic and plastic deformations in the host crystal structures simultaneously due to the recovery of systems) but within the suppression trend. Shortly, all the semi-empiric models preferred in the present work are found to be useful descriptors to define the suitable relationship between the ion-addition mechanism in the crystal lattice and mechanical durability/performances of vanadium-added Bi-2223 materials. We should, of course, declare here that Hays-Kendall approach is gathered to be the best approach model for the load-independent Vickers hardness values in the plateau limit regions.

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Development of a High-Efficiency Conduction Cooling Technology for SMES Coils

Cited by 37 publications

References 4 publications

Development of cooling technologies for SMES

Development of cooling technologies for SMES

A VALUABLE VIEW ON EVALUATION OF GENERAL MECHANICAL PERFORMANCES PERTAINING TO Bi-2223 SUPERCONDUCTING CERAMICS WITH VANADIUM ADDITION

EXAMINATION OF VANADIUM EFFECT ON GENERAL MECHANICAL CHARACTERISTICS OF Bi-2223 MATERIALS VIA SEMI-EMPIRIC MODELS

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