成果報告書詳細
管理番号20110000000708
タイトル*平成22年度中間年報 「省エネルギー革新技術開発事業/先導研究/磁気熱量効果を応用した革新的高効率冷熱技術の研究開発」
公開日2011/10/12
報告書年度2010 - 2010
委託先名株式会社東芝 国立大学法人千葉大学
プロジェクト番号P09015
部署名エネルギー対策推進部
和文要約研究開発の内容及び成果等:
(1)磁性材料の設計・試作・特性評価の研究
高性能材料のサイクル適用化を目指し、本年度は、1次および2次の磁気相転移を有する典型的な材料系を選択して試作しその物性評価を行った。また、冷凍試験に供するために、磁性材料の球状粒子を試作した。
(2)磁気冷凍サイクルの計算解析の研究
要素実験を進めるとともに、計算によるアプローチによって磁気冷凍サイクルの持つ本来の性質を明らかにし、そのポテンシャルを示すことを目標としている。そこでまずは、AMRサイクルのモデルを構築し、サイクルの模擬計算を行って、実験結果との比較検討を進めた。
(3)磁気冷凍サイクルの基盤技術の研究
磁気冷凍サイクルの高性能化に向けて、本年度は性能指標の1つである生成温度差について、磁気冷凍材料の観点から検討した。
(4)磁気冷凍システムの基盤技術の研究
回転型の磁気冷凍システムを想定し、磁性材料、永久磁石、冷媒とこれらの可動機構などの要素に立ち返り、磁気回路・駆動機構の基本設計を行うとともに冷媒動作における課題抽出を行った。また、磁気回路動作部の1次試作を行った。
(5)研究総括
高効率な磁気冷凍システムの実現に向けて、上記(1)~(4)の項目で得られた結果や知見を基に考察した。
英文要約The aim of this program is to establish fundamental technology of magnetic refrigeration to improve refrigeration efficiency of general-purpose refrigeration equipment. This is a collaborative program consisting Toshiba Corporation, Chiba University and the National Institute for Materials Science (NIMS).
1. Research on magnetic materials for magnetic refrigeration
Two different types of materials, La(Fe,Si)13 intermetallic compounds which exhibit 1st-order metamagnetic transition and Gd alloys which exhibit 2nd-order magnetic transition, were investigated.
2. Research of AMR cycle by numerical calculation
In the AMR cycle, the magnetic material works as a refrigerant material and also as a heat regenerator material, and a refrigerant fluid works as a heat transfer medium which exchanges heat with the magnetic material and transfers heat from a certain point to another as it flows through the packed material in the AMR working cell (“regenerator”). In this study, we established a basic model of the AMR cycle consisting of four processes, considering the factors including heat generation of magnetic material based on magnetocaloric effects, heat exchange between magnetic material and refrigerant fluid, heat transfer and pressure loss by fluid flow, heat conduction in an axial direction of temperature gradient, and heat transfer between regenerator and ambient air. Temperature changes in the AMR cell while operating a cycle were investigated by model calculation under many operating conditions.
3. Development of fundamental technology of AMR cycle by experimental method
The effect of layered structure of magnetic materials on the temperature spans of AMR cycle was investigated. Several kinds of Gd alloys spherical particles (given by research on magnetic materials mentioned above) were adapted to double-layered structure of AMR cell, and AMR cycle experiments were performed and accumulate the basic data.
4. Development of fundamental technology of magnetic refrigeration system
Preliminary design of a system including magnetic materials, permanent magnets, refrigerant fluid, and rotation mechanism for applying/removing magnetic field to/from the materials has been started.
5. Conclusion
The actual efficiency is determined by the ideal efficiency and various loss factors, that is, the loss factors related to the performance such as heat exchange loss between material and fluid, pressure loss of fluid in the AMR working cell, heat conductions in the fluid/material in an axial direction, and thermal dissipation from the cell to ambient air, and the loss factors related to the input power such as torque load arising from magnetic force, viscous loss of fluid, and mechanical losses of motor and pump.
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