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成果報告書詳細
管理番号20190000000243
タイトル*平成30年度中間年報 NEDO先導研究プログラム/エネルギー・環境新技術先導研究プログラム/次世代ヒートポンプ実現のための高感度メタ磁性材料の研究開発
公開日2019/5/14
報告書年度2018 - 2018
委託先名ダイキン工業株式会社 国立研究開発法人産業技術総合研究所
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title: Advanced Research Program for Energy and Environmental Technologies / High sensitivity meta-magnetic materials for realization of next generation heat pump (FY2018-2019) FY2018 Annual Report

In order to establish the elemental technologies towards realization of the high-efficiency magnetic heat-pump system with high-performance magnetocaloric materials, the following items were conducted.
1) Performance improvements for (La,R)(Fe,Mn,Si)13 magnetocaloric compounds by complex substitutions
We have investigated the process tuning to improve magnetocaloric performance in (La,R)(Fe,Mn,Si)13H. To achieve a stable production process of specimens in the gram-order scale, firstly, hydrogenation technique was improved. We have confirmed that the activation process is effective in the present compounds to achieve smooth hydrogen absorption, resulting in the magnetic entropy change higher than the border-line. The effectiveness of the activation process is also displayed in the control of the Curie temperature TC, which must be precisely controlled for realization of the cascade arrangements in the magnetic regenerative modules.
2) Establishment of restriction conditions for the splitting phenomenon in (La,R)(Fe,Mn,Si)13Hy magnetocaloric compounds
The splitting phenomenon is an uphill diffusion phenomenon of hydrogen between the paramagnetic to ferromagnetic phase coexisting at the transition process, and the splitting of TC results in a collapse of the cascade arrangement. A new alloy recipe brings about an inhibition for the splitting phenomenon. Also, a certain metallographic feature was found to have a causality with the occurrence of the splitting phenomenon.
3) Optimization of magnetic heat pump system by numerical simulations for utilization of new materials
Performance improvements of the magnetic heat pump system depend on various refinements; e.g., materials cascade design for a low-field operation, increment of operating frequency, heat transfer promotion, and suppression of pressure drop in the cascade-type active magnetic regenerator (AMR) modules. System simulations were performed in the aim of realization of these refinements, and various constitution parameters are determined to maximize the cooling capacity per unit weight of magnetic refrigerant.
4) Manufacturing and evaluation of the test module for magnetic heat-pump composed of new materials
Using the simulation results, test module of the cascade-type AMR, together with the flow and the magnetic circuits are constructed, and their performances are evaluated. The fluid circuit was tuned to realize the simulated flow conditions, and the test product was equipped to the 5-stage cascade AMR, then, the pressure drop and mass flow of the heat transfer fluid were experimentally measured. The obtained data supports the validity of the simulated results.
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