Thermal micro energy harvesting by thermomagnetic film actuation

通过热磁薄膜驱动进行热微能收集

• 批准号: 230771024
• 负责人: Privatdozent Dr. Sebastian Fähler
• 金额: --
• 依托单位: Institut für Ionenstrahlphysik und Materialforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/230771024?language=en
• 关键词: Thermal; micro; energy; harvesting; thermomagnetic

This project on “Thermal micro energy harvesting by thermomagnetic film actuation” investigates a novel approach to generate electrical energy from thermal energy on the miniature scale. It expands a precursor project at KIT, in which thermomagnetic generators (TMGs) have been developed, reaching average power densities of the active material of 118 mW cm-3 and 5% of Carnot efficiency. These specifications already compete with the best thermoelectric generators at the length scale of a centimetre and below. The current project addresses the key characteristics of a TMG: (1) Expansion of the usable temperature range to 30–100°C, (2) increase of electrical power, and (3) improvement of thermodynamic efficiency. As the performance of miniaturized TMGs is intimately connected with the functional properties of the thermomagnetic films used, this joint proposal brings together the complementary competence on microsystem engineering of KIT and thermomagnetic materials science of IFW.For optimization of TMG characteristics (1)-(3), the thermomagnetic properties of Ni-Mn-based Heusler and Ga-based films (transition temperatures, temperature-dependent change of magnetization, dM/dT, hysteresis) will be tailored by varying composition and degree of order. The design of the TMGs will be optimized by improving heat transfer, enhancing magnetic field gradient, as well as tuning mechanical resonance. In particular, for the improvement of heat transfer micromachined films will be applied, containing trenches filled by Cu. The scaling properties of TMG characteristics will be investigated experimentally, as well as by lumped element modelling. Based on the optimum scaling of a single TMG, distributed systems of 1D and 2D arrays of TMGs will be developed in order to bring the total power in line with the practical needs of IoT and industry4.0.

本研究课题“热磁薄膜驱动的微热能收集”，研究了一种在微型尺度上从热能产生电能的新方法。它扩大了KIT的一个前体项目，其中开发了热磁发电机（TMG），达到了118 mW cm-3的活性材料平均功率密度和5%的卡诺效率。这些规格已经与最好的热电发电机在一厘米及以下的长度规模竞争。目前的项目解决了TMG的关键特性：（1）将可用温度范围扩展到30-100°C，（2）增加电力，（3）提高热力学效率。由于微型TMG的性能与所使用的热磁薄膜的功能特性密切相关，因此该联合提案将KIT的微系统工程和IFW的热磁材料科学的互补能力结合在一起。将通过改变组成和有序度来定制这些参数（转变温度、磁化强度的温度依赖性变化、dM/dT、磁滞）。TMG的设计将通过改善热传递、增强磁场梯度以及调谐机械共振来优化。特别是，为了改善传热微加工膜将被应用，包含由Cu填充的沟槽。TMG特性的缩放特性将进行实验研究，以及通过集总元件建模。基于单个TMG的最佳扩展，将开发TMG的1D和2D阵列的分布式系统，以使总功率符合物联网和工业4.0的实际需求。