| 研究課題/領域番号 |
23K19097
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| 研究機関 | 名古屋大学 |
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研究代表者 |
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| 研究期間 (年度) |
2023-08-31 – 2025-03-31
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| キーワード | Magnetic refrigeration / Nanofluid / Heat transfer / Thermophysical property / Lock-in thermography |
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| 研究実績の概要 |
This research project focuses on advancing active magnetic regenerative refrigeration technology by utilizing magnetocaloric micro/nano particles in a hybrid nanofluid. This approach aims to simplify the system, increase efficiency, enable more compact designs, and improve heat transfer rates compared to traditional refrigeration systems.
In the first fiscal year, two main research results were achieved. Firstly, we successfully demonstrated the proposed approach to establish a new efficient active magnetic regenerative refrigeration system using a magnetocaloric fluid circulating in a simplified configuration. This was accomplished through the synthesis of the magnetocaloric fluid with Gd magnetocaloric particles and additives to enhance heat transfer performance. Subsequently, we constructed a prototype of the simplified active magnetic regenerative refrigeration system incorporating this approach.
Secondly, in order to optimize the properties of the hybrid magnetocaloric nanofluid to increase the performance of the proposed system, we developed a new measurement method based on thermal imaging technique. This method allowed us to study the magnetocaloric effect and thermal behavior of the hybrid magnetocaloric nanofluid. By utilizing this method, we gained insights into how the size, volume concentration, and interactions of the particles impact the intensity of the magnetocaloric effect. This understanding is crucial for fine-tuning the properties of the nanofluid to maximize its efficiency in the refrigeration system.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The experiments on creating the proposed active magnetic refrigeration system with a magnetocaloric hybrid nanofluid are making good progress and yielding results. As planned, a new measurement method is developed using thermal imaging to study the magnetocaloric effect and thermal behavior of magneto-caloric materials micro/nanoparticles to understand how the size, volume concentration, and interactions of these particles with the fluid and other additives affect the magnetocaloric effect intensity and the interaction and thermal behavior of the particles within the fluid. Additionally, a prototype of the system is constructed to demonstrate the proposed approach and optimize the magnetocaloric hybrid nanofluid and the operating parameters. Based on this year's research, we expect smooth progress in next year's work.
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| 今後の研究の推進方策 |
The primary focus during the next phase will be on improving the stability, thermophysical properties, and rheological characteristics of the magnetocaloric hybrid nanofluid. To achieve this, we intend to incorporate the addition of MWCNT, surfactant and other additives into the nanofluid formulation. The concentration of these additives will be selected and tested to ensure they are compatible with the magnetocaloric particles and do not compromise the fluid's stability. Furthermore, we plan to conduct a comprehensive evaluation of the performance of the proposed system under various operating conditions, including different cooling loads and environmental parameters. This evaluation will allow us to optimize the system's performance and efficiency for a wide range of practical applications. Finally, we will compare the performance of our optimized system with that of currently available refrigeration systems.
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| 次年度使用額が生じた理由 |
The original research plan was to complete the development of the rheological characterization and fabrication facilities system of hybrid nanofluids by the end of first fiscal year. However, due to the shortage of semiconductor supplies and other factors, the delivery of some devices that were scheduled to be available within the first fiscal has been postponed to the following fiscal year. For this reason, the cost of consumables used for the hybrid nanofluid fabrication system was carried over to the next fiscal year's usage amount. Since there are no major changes to the research content, the full amount, including unused carryover funds, will be used in this year as originally planned
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