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.

该项目关于“热磁性膜激活收集热量能量”的项目研究了一种新的方法，以在微型尺度上从热磁能产生电能。它扩展了在Kit的前体项目，其中已经开发了热磁性发电机（TMG），达到118 MW CM-3的活性材料的平均功率密度和Carnot效率的5％。这些规格已经在厘米及以下的长度尺度上与最佳的热电发电机竞争。当前的项目解决了TMG的关键特征：（1）将可用温度范围扩展到30–100°C，（2）电力的增加，以及（3）提高热力学效率。 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,磁化，DM/DT，滞后的温度依赖性变化将根据不同的组成和秩序程度来量身定制。 TMG的设计将通过改善传热，增强磁场梯度以及调整机械共振来优化。特别是，为了改善热传递的微机械膜，包含Cu填充的沟渠。 TMG特性的缩放特性将进行实验研究，并通过集体元素建模进行研究。基于单个TMG的最佳缩放，将开发TMG的1D和2D阵列的分布式系统，以使总功率与IoT和Industry 4.0的实际需求保持一致。