Swoboda Timm, Klinar Katja, Abbasi Shahzaib, Brem Gerrit, Kitanovski Andrej, Muñoz Rojo Miguel
Department of Thermal and Fluid Engineering, University of Twente, Enschede, Overijssel 7500, The Netherlands.
Faculty of Mechanical Engineering, University of Ljubljana, Osrednjeslovenska, Askerceva 6, 1000, Ljubljana, Slovenia.
iScience. 2021 Jul 10;24(8):102843. doi: 10.1016/j.isci.2021.102843. eCollection 2021 Aug 20.
Solid-state thermal control devices that present an asymmetric heat flow depending on thermal bias directionality, referred to as thermal diodes, have recently received increased attention for energy management. The use of materials that can change phase is a common approach to design thermal diodes, but typical sizes, moderate rectification ratios, and narrow thermal tunability limit their potential applications. In this work, we propose a multilayer thermal diode made of a combination of phase change and invariant materials. This device presents state-of-the-art thermal rectification ratios up to 136% for a temperature range between 300 K and 500 K. Importantly, this design allows to switch between distinct rectification states that can be modulated with temperature, achieving an additional degree of thermal control compared with single-rectification-state devices. We analyze the relevance of our thermal diodes for retaining heat more efficiently in thermal storage elements.
固态热控装置根据热偏置方向性呈现不对称热流，被称为热二极管，最近在能量管理方面受到了越来越多的关注。使用能够改变相态的材料是设计热二极管的常用方法，但典型尺寸、中等整流比和狭窄的热可调性限制了它们的潜在应用。在这项工作中，我们提出了一种由相变材料和不变材料组合而成的多层热二极管。该装置在300 K至500 K的温度范围内呈现出高达136%的先进热整流比。重要的是，这种设计允许在不同的整流状态之间切换，这些状态可以随温度进行调制，与单整流状态的装置相比，实现了额外的热控程度。我们分析了我们的热二极管对于在蓄热元件中更有效地保留热量的相关性。
