Electrocaloric multilayer cooling device concepts

电热多层冷却装置概念

• 批准号: 226684348
• 负责人: Professor Dr.-Ing. Gerald Gerlach
• 金额: --
• 依托单位: Institut für Festkörperelektronik (IFE)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/226684348?language=en
• 关键词: Electrocaloric; multilayer; cooling; device; concepts

Ferroic cooling exploits electric field-driven entropy changes near phase transitions in solid-state materials. It is considered an exceptionally energy-efficient and environmentally friendly cooling technology. Since electrical energy is ubiquitously available, in particular the electrocaloric (EC) cooling effect seems to have the highest potential for being used in future everyday devices.Theoretical studies in the first funding period have clearly shown that the material for EC cooling devices should make be of relaxor-type, that it should be composed stoichiometrically, dense and poreless to apply high electric field strengths and that it should be very thin. Relaxor thin films meet these requirements at the best.For that reason, we continue to study BaTiO3-based materials which are environmentally friendly lead-free materials allowing such high electric fields. In particular, (Ba,Sc,Ca)(Ti,Zr)O3:Mn and (Ba,Sc,Ca)(Ti,Sn)O3:Mn remain in the focus of our work because they show large EC activity in a broad temperature range. We adjust the composition of these thin films easily by multi-target sputtering where the power of each target is controlled separately. Furthermore, multi-target sputtering enables large-scale production on stiff and on flexible substrates as well as reel-to-reel deposition.In particular, the proposal for the second funding period focuses on material development and optimization, on fabrication and evaluation of multilayer stacks with embedded electrodes, on the concept of multilayer EC cooling devices and on the fabrication and evaluation of an EC cooling demonstrators.

铁从固态材料中的相变附近的电场驱动熵的变化利用了电场驱动的熵变化。它被认为是一种非常节能且环保的冷却技术。由于电能普遍存在，因此尤其是电离（EC）冷却效果似乎具有最高的潜力，可在未来的日常设备中使用。第一个融资期的理论研究清楚地表明，EC冷却设备的材料应具有放松型的材料，应具有稳固的，密集的，密集的，高电场的效果，应该是非常稀薄的，应该是非常薄的，应该是非常薄的。放松液薄膜最能满足这些要求。出于这个原因，我们继续研究基于BATIO3的材料，这些材料是环保的无铅材料，可以使用如此高的电场。特别是（BA，SC，CA）（Ti，Zr）O3：MN和（BA，SC，CA）（Ti，sn）O3：Mn保留在我们工作的焦点上，因为它们在较大的温度范围内显示出较大的EC活动。我们通过多目标溅射轻松地调节这些薄膜的组成，在该溅射中，每个目标的功率分开控制。此外，多目标溅射可以在刚性和柔性基材上以及卷卷到卷积的沉积上进行大规模生产。尤其是，第二融资期的提案侧重于材料开发和优化，制造和评估多层堆栈的嵌入式电极概念以及对多层式的构造和制造材料的概念，以及对多层次的构造和构造的概念。