九州体育网

新闻动态
?综合新闻
?科研动态
?学术活动
?媒体聚焦
?通知公告
您现在的位置:首页 > 新闻动态 > 学术活动
9.17】Prof. Ekkes Brück
Lee Hsun Lecture Series
 
2019-09-11 | 文章来源:李薰奖办公室        【 】【打印】【关闭

Lee Hsun Lecture Series

Topic: Generating Electricity from Waste Heat using Magneto-structural Materials

Speaker: Prof. Ekkes Brück, Delft University of Technology, the Netherlands.

Time: 10:00-12:00, (Tue.) Sept.17, 2019

Venue: Room 249,Lee Hsun Building, IMR CAS

Abstract:

Magneto-caloric power conversion can be used to convert heat into electricity that up to now was considered as waste. This new technology therefore has the potential to significantly contribute to the energy transition on a global scale.

With the advent of giant magneto-caloric effects (MCE) that occur in conjunction with magneto-elastic or magneto-structural phase transition of first order (FOT), room temperature heat-pump applications became feasible. In this context the MnFe(P,X) system is of particular interest as it contains earth abundant ingredients that are not toxic. This material family derives from the Fe P compound, a prototypical example known since a long time to exhibit a sharp but weak FOT at 210 K (-63°C) [1]. Other promising materials are based on La(Fe,Si)13 [2].

Magneto-caloric power-conversion calls for a somewhat different combination of properties [1], in particular a large latent heat that is favourable for a heatpump, is detrimental for power conversion as a lot of heat is needed to change the temperature. Yet a large change of magnetization is required to generate a high torque in a device as depicted in Fig. 1, which suggests one should either employ materials exhibiting exchange inversion or second order materials. Magnetically highly responsive materials in combination with the field generated by a permanent magnet open the way to new technology for magnetic refrigeration, heat pumps and power generation. Employing the highly efficient coupling between the degrees of freedom of magnetic spins and lattice vibrations in a solid, will render energy conversion and energy generation technologies that get close to the theoretical limits.

References:
[1] L. Lundgren, G. Tarmohamed, O. Beckman, et al. Phys. Scr. Vol. 17, p.39-48 (1978)
[2] F.X. Hu, B.G. Shen, J.R. Sun et al. Appl. Phys Lett. Vol 80, p. 826-828 (2002)
[3] T. Christiaanse and E. Brück. Metallurgical and Materials Transactions E, Vol. 1 p.36-40 (2014)

KEYWORDS: Materials for Energy, Magnetocaloric, waste heat recovery. 

文档附件

相关信息
联系我们 | 所长信箱 | 网站地图 | 友情链接
地址: 沈阳市沈河区文化路72号 邮编: 110016
管理员邮箱: office@imr.ac.cn
九州体育备用网址 版权所有 辽ICP备05005387号


官方微信