A Numerical Model of an Active Magnetic Regenerator Refrigeration System
A Numerical Model of an Active Magnetic Regenerator Refrigeration System
复制标题
主动磁再生制冷系统的数值模型
DOI：
10.1007/0-387-27533-9_60
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
S. Klein
中科院分区：
文献类型：
--
作者：
K. Engelbrecht;G. Nellis;S. Klein
主动磁再生制冷（AMRR）系统代表了一种不使用氟碳化合物工作流体的环境吸引力的空间冷却和制冷替代方案。最近的两项发展使AMRR在短期内可行。一个旋转再生床，利用实用和负担得起的永磁体已被证明，并显示实现了合理的性能系数（COP）。同时，已经开发了具有可调节居里温度的磁热材料合金族。使用这些材料，有可能构建分层的再生器床，其可以在其整个操作范围内实现高磁热效应。本文描述了一个数值模型，能够预测的实际限制，这种技术的性能应用于空间空调和制冷。该模型将回热器床视为具有居里温度空间变化的磁性材料的一维矩阵，因此具有磁性。该基质经受空间和时间变化的磁场和流体质量流率。这些强制功能的变化是基于一个旋转，多床配置的实施。数值模型求解使用一个完全隐式（在时间和空间）离散化的控制能量方程。控制方程的非线性方面（例如，流体和磁性变化）使用松弛技术来处理。一些初步的建模结果，说明如何AMRR系统可以优化特定的操作条件。AMRR在空间冷却应用中的分层与非分层床的性能与当前的蒸汽压缩技术进行了比较。
Active magnetic regenerative refrigeration (AMRR) systems represent an environmentally attractive space cooling and refrigeration alternative that do not use a fluorocarbon working fluid. Two recent developments have made AMRR’s feasible in the near-term. A rotary regenerator bed utilizing practical and affordable permanent magnets has been demonstrated and shown to achieve a reasonable coefficient of performance (COP). Concurrently, families of magnetocaloric material alloys with adjustable Curie temperatures have been developed. Using these materials, it is possible to construct a layered regenerator bed that can achieve a high magnetocaloric effect across its entire operating range. This paper describes a numerical model capable of predicting the practical limits of the performance of this technology applied to space conditioning and refrigeration. The model treats the regenerator bed as a one dimensional matrix of magnetic material with a spatial variation in Curie temperature, and therefore magnetic properties. The matrix is subjected to a spatially and temporally varying magnetic field and fluid mass flow rate. The variation of these forcing functions is based on the implementation of a rotating, multiple bed configuration. The numerical model is solved using a fully implicit (in time and space) discretization of the governing energy equations. The nonlinear aspects of the governing equations (e.g., fluid and magnetic property variations) are handled using a relaxation technique. Some preliminary modeling results are presented which illustrate how an AMRR system can be optimized for a particular operating condition. The performance of the AMRR in a space cooling application with the layered vs non-layered bed is compared to current vapor compression technology.
流式细胞术分析胃癌患者腹腔内免疫细胞
DOI：
--
发表时间：
2022
期刊：
影响因子：
--
作者：
髙橋和也;大澤英之;金丸理人;倉科憲太郎;齋藤心;山口博紀;細谷好則;北山丈二,佐田尚宏
通讯作者：
北山丈二,佐田尚宏